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Annotation of src/sys/kern/subr_pool.c, Revision 1.218

1.218   ! mrg         1: /*     $NetBSD: subr_pool.c,v 1.217 2017/12/02 08:15:42 mrg Exp $      */
1.1       pk          2:
                      3: /*-
1.204     maxv        4:  * Copyright (c) 1997, 1999, 2000, 2002, 2007, 2008, 2010, 2014, 2015
1.183     ad          5:  *     The NetBSD Foundation, Inc.
1.1       pk          6:  * All rights reserved.
                      7:  *
                      8:  * This code is derived from software contributed to The NetBSD Foundation
1.20      thorpej     9:  * by Paul Kranenburg; by Jason R. Thorpe of the Numerical Aerospace
1.204     maxv       10:  * Simulation Facility, NASA Ames Research Center; by Andrew Doran, and by
                     11:  * Maxime Villard.
1.1       pk         12:  *
                     13:  * Redistribution and use in source and binary forms, with or without
                     14:  * modification, are permitted provided that the following conditions
                     15:  * are met:
                     16:  * 1. Redistributions of source code must retain the above copyright
                     17:  *    notice, this list of conditions and the following disclaimer.
                     18:  * 2. Redistributions in binary form must reproduce the above copyright
                     19:  *    notice, this list of conditions and the following disclaimer in the
                     20:  *    documentation and/or other materials provided with the distribution.
                     21:  *
                     22:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     23:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     24:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     25:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     26:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     27:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     28:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     29:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     30:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     31:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     32:  * POSSIBILITY OF SUCH DAMAGE.
                     33:  */
1.64      lukem      34:
                     35: #include <sys/cdefs.h>
1.218   ! mrg        36: __KERNEL_RCSID(0, "$NetBSD: subr_pool.c,v 1.217 2017/12/02 08:15:42 mrg Exp $");
1.24      scottr     37:
1.205     pooka      38: #ifdef _KERNEL_OPT
1.141     yamt       39: #include "opt_ddb.h"
1.28      thorpej    40: #include "opt_lockdebug.h"
1.205     pooka      41: #endif
1.1       pk         42:
                     43: #include <sys/param.h>
                     44: #include <sys/systm.h>
1.203     joerg      45: #include <sys/sysctl.h>
1.135     yamt       46: #include <sys/bitops.h>
1.1       pk         47: #include <sys/proc.h>
                     48: #include <sys/errno.h>
                     49: #include <sys/kernel.h>
1.191     para       50: #include <sys/vmem.h>
1.1       pk         51: #include <sys/pool.h>
1.20      thorpej    52: #include <sys/syslog.h>
1.125     ad         53: #include <sys/debug.h>
1.134     ad         54: #include <sys/lockdebug.h>
                     55: #include <sys/xcall.h>
                     56: #include <sys/cpu.h>
1.145     ad         57: #include <sys/atomic.h>
1.3       pk         58:
1.187     uebayasi   59: #include <uvm/uvm_extern.h>
1.3       pk         60:
1.1       pk         61: /*
                     62:  * Pool resource management utility.
1.3       pk         63:  *
1.88      chs        64:  * Memory is allocated in pages which are split into pieces according to
                     65:  * the pool item size. Each page is kept on one of three lists in the
                     66:  * pool structure: `pr_emptypages', `pr_fullpages' and `pr_partpages',
                     67:  * for empty, full and partially-full pages respectively. The individual
                     68:  * pool items are on a linked list headed by `ph_itemlist' in each page
                     69:  * header. The memory for building the page list is either taken from
                     70:  * the allocated pages themselves (for small pool items) or taken from
                     71:  * an internal pool of page headers (`phpool').
1.1       pk         72:  */
                     73:
1.202     abs        74: /* List of all pools. Non static as needed by 'vmstat -i' */
                     75: TAILQ_HEAD(, pool) pool_head = TAILQ_HEAD_INITIALIZER(pool_head);
1.134     ad         76:
1.3       pk         77: /* Private pool for page header structures */
1.97      yamt       78: #define        PHPOOL_MAX      8
                     79: static struct pool phpool[PHPOOL_MAX];
1.135     yamt       80: #define        PHPOOL_FREELIST_NELEM(idx) \
                     81:        (((idx) == 0) ? 0 : BITMAP_SIZE * (1 << (idx)))
1.3       pk         82:
1.62      bjh21      83: #ifdef POOL_SUBPAGE
                     84: /* Pool of subpages for use by normal pools. */
                     85: static struct pool psppool;
                     86: #endif
                     87:
1.204     maxv       88: #ifdef POOL_REDZONE
                     89: # define POOL_REDZONE_SIZE 2
                     90: static void pool_redzone_init(struct pool *, size_t);
                     91: static void pool_redzone_fill(struct pool *, void *);
                     92: static void pool_redzone_check(struct pool *, void *);
                     93: #else
                     94: # define pool_redzone_init(pp, sz)     /* NOTHING */
                     95: # define pool_redzone_fill(pp, ptr)    /* NOTHING */
                     96: # define pool_redzone_check(pp, ptr)   /* NOTHING */
                     97: #endif
                     98:
1.98      yamt       99: static void *pool_page_alloc_meta(struct pool *, int);
                    100: static void pool_page_free_meta(struct pool *, void *);
                    101:
                    102: /* allocator for pool metadata */
1.134     ad        103: struct pool_allocator pool_allocator_meta = {
1.191     para      104:        .pa_alloc = pool_page_alloc_meta,
                    105:        .pa_free = pool_page_free_meta,
                    106:        .pa_pagesz = 0
1.98      yamt      107: };
                    108:
1.208     chs       109: #define POOL_ALLOCATOR_BIG_BASE 13
                    110: extern struct pool_allocator pool_allocator_big[];
                    111: static int pool_bigidx(size_t);
                    112:
1.3       pk        113: /* # of seconds to retain page after last use */
                    114: int pool_inactive_time = 10;
                    115:
                    116: /* Next candidate for drainage (see pool_drain()) */
1.23      thorpej   117: static struct pool     *drainpp;
                    118:
1.134     ad        119: /* This lock protects both pool_head and drainpp. */
                    120: static kmutex_t pool_head_lock;
                    121: static kcondvar_t pool_busy;
1.3       pk        122:
1.178     elad      123: /* This lock protects initialization of a potentially shared pool allocator */
                    124: static kmutex_t pool_allocator_lock;
                    125:
1.135     yamt      126: typedef uint32_t pool_item_bitmap_t;
                    127: #define        BITMAP_SIZE     (CHAR_BIT * sizeof(pool_item_bitmap_t))
                    128: #define        BITMAP_MASK     (BITMAP_SIZE - 1)
1.99      yamt      129:
1.3       pk        130: struct pool_item_header {
                    131:        /* Page headers */
1.88      chs       132:        LIST_ENTRY(pool_item_header)
1.3       pk        133:                                ph_pagelist;    /* pool page list */
1.88      chs       134:        SPLAY_ENTRY(pool_item_header)
                    135:                                ph_node;        /* Off-page page headers */
1.128     christos  136:        void *                  ph_page;        /* this page's address */
1.151     yamt      137:        uint32_t                ph_time;        /* last referenced */
1.135     yamt      138:        uint16_t                ph_nmissing;    /* # of chunks in use */
1.141     yamt      139:        uint16_t                ph_off;         /* start offset in page */
1.97      yamt      140:        union {
                    141:                /* !PR_NOTOUCH */
                    142:                struct {
1.102     chs       143:                        LIST_HEAD(, pool_item)
1.97      yamt      144:                                phu_itemlist;   /* chunk list for this page */
                    145:                } phu_normal;
                    146:                /* PR_NOTOUCH */
                    147:                struct {
1.141     yamt      148:                        pool_item_bitmap_t phu_bitmap[1];
1.97      yamt      149:                } phu_notouch;
                    150:        } ph_u;
1.3       pk        151: };
1.97      yamt      152: #define        ph_itemlist     ph_u.phu_normal.phu_itemlist
1.135     yamt      153: #define        ph_bitmap       ph_u.phu_notouch.phu_bitmap
1.3       pk        154:
1.1       pk        155: struct pool_item {
1.3       pk        156: #ifdef DIAGNOSTIC
1.82      thorpej   157:        u_int pi_magic;
1.33      chs       158: #endif
1.134     ad        159: #define        PI_MAGIC 0xdeaddeadU
1.3       pk        160:        /* Other entries use only this list entry */
1.102     chs       161:        LIST_ENTRY(pool_item)   pi_list;
1.3       pk        162: };
                    163:
1.53      thorpej   164: #define        POOL_NEEDS_CATCHUP(pp)                                          \
                    165:        ((pp)->pr_nitems < (pp)->pr_minitems)
                    166:
1.43      thorpej   167: /*
                    168:  * Pool cache management.
                    169:  *
                    170:  * Pool caches provide a way for constructed objects to be cached by the
                    171:  * pool subsystem.  This can lead to performance improvements by avoiding
                    172:  * needless object construction/destruction; it is deferred until absolutely
                    173:  * necessary.
                    174:  *
1.134     ad        175:  * Caches are grouped into cache groups.  Each cache group references up
                    176:  * to PCG_NUMOBJECTS constructed objects.  When a cache allocates an
                    177:  * object from the pool, it calls the object's constructor and places it
                    178:  * into a cache group.  When a cache group frees an object back to the
                    179:  * pool, it first calls the object's destructor.  This allows the object
                    180:  * to persist in constructed form while freed to the cache.
                    181:  *
                    182:  * The pool references each cache, so that when a pool is drained by the
                    183:  * pagedaemon, it can drain each individual cache as well.  Each time a
                    184:  * cache is drained, the most idle cache group is freed to the pool in
                    185:  * its entirety.
1.43      thorpej   186:  *
                    187:  * Pool caches are layed on top of pools.  By layering them, we can avoid
                    188:  * the complexity of cache management for pools which would not benefit
                    189:  * from it.
                    190:  */
                    191:
1.142     ad        192: static struct pool pcg_normal_pool;
                    193: static struct pool pcg_large_pool;
1.134     ad        194: static struct pool cache_pool;
                    195: static struct pool cache_cpu_pool;
1.3       pk        196:
1.189     pooka     197: pool_cache_t pnbuf_cache;      /* pathname buffer cache */
                    198:
1.145     ad        199: /* List of all caches. */
                    200: TAILQ_HEAD(,pool_cache) pool_cache_head =
                    201:     TAILQ_HEAD_INITIALIZER(pool_cache_head);
                    202:
1.162     ad        203: int pool_cache_disable;                /* global disable for caching */
1.169     yamt      204: static const pcg_t pcg_dummy;  /* zero sized: always empty, yet always full */
1.145     ad        205:
1.162     ad        206: static bool    pool_cache_put_slow(pool_cache_cpu_t *, int,
                    207:                                    void *);
                    208: static bool    pool_cache_get_slow(pool_cache_cpu_t *, int,
                    209:                                    void **, paddr_t *, int);
1.134     ad        210: static void    pool_cache_cpu_init1(struct cpu_info *, pool_cache_t);
                    211: static void    pool_cache_invalidate_groups(pool_cache_t, pcg_t *);
1.175     jym       212: static void    pool_cache_invalidate_cpu(pool_cache_t, u_int);
1.196     jym       213: static void    pool_cache_transfer(pool_cache_t);
1.3       pk        214:
1.42      thorpej   215: static int     pool_catchup(struct pool *);
1.128     christos  216: static void    pool_prime_page(struct pool *, void *,
1.55      thorpej   217:                    struct pool_item_header *);
1.88      chs       218: static void    pool_update_curpage(struct pool *);
1.66      thorpej   219:
1.113     yamt      220: static int     pool_grow(struct pool *, int);
1.117     yamt      221: static void    *pool_allocator_alloc(struct pool *, int);
                    222: static void    pool_allocator_free(struct pool *, void *);
1.3       pk        223:
1.97      yamt      224: static void pool_print_pagelist(struct pool *, struct pool_pagelist *,
1.199     christos  225:        void (*)(const char *, ...) __printflike(1, 2));
1.42      thorpej   226: static void pool_print1(struct pool *, const char *,
1.199     christos  227:        void (*)(const char *, ...) __printflike(1, 2));
1.3       pk        228:
1.88      chs       229: static int pool_chk_page(struct pool *, const char *,
                    230:                         struct pool_item_header *);
                    231:
1.135     yamt      232: static inline unsigned int
1.97      yamt      233: pr_item_notouch_index(const struct pool *pp, const struct pool_item_header *ph,
                    234:     const void *v)
                    235: {
                    236:        const char *cp = v;
1.135     yamt      237:        unsigned int idx;
1.97      yamt      238:
                    239:        KASSERT(pp->pr_roflags & PR_NOTOUCH);
1.128     christos  240:        idx = (cp - (char *)ph->ph_page - ph->ph_off) / pp->pr_size;
1.97      yamt      241:        KASSERT(idx < pp->pr_itemsperpage);
                    242:        return idx;
                    243: }
                    244:
1.110     perry     245: static inline void
1.97      yamt      246: pr_item_notouch_put(const struct pool *pp, struct pool_item_header *ph,
                    247:     void *obj)
                    248: {
1.135     yamt      249:        unsigned int idx = pr_item_notouch_index(pp, ph, obj);
                    250:        pool_item_bitmap_t *bitmap = ph->ph_bitmap + (idx / BITMAP_SIZE);
                    251:        pool_item_bitmap_t mask = 1 << (idx & BITMAP_MASK);
1.97      yamt      252:
1.135     yamt      253:        KASSERT((*bitmap & mask) == 0);
                    254:        *bitmap |= mask;
1.97      yamt      255: }
                    256:
1.110     perry     257: static inline void *
1.97      yamt      258: pr_item_notouch_get(const struct pool *pp, struct pool_item_header *ph)
                    259: {
1.135     yamt      260:        pool_item_bitmap_t *bitmap = ph->ph_bitmap;
                    261:        unsigned int idx;
                    262:        int i;
1.97      yamt      263:
1.135     yamt      264:        for (i = 0; ; i++) {
                    265:                int bit;
1.97      yamt      266:
1.135     yamt      267:                KASSERT((i * BITMAP_SIZE) < pp->pr_itemsperpage);
                    268:                bit = ffs32(bitmap[i]);
                    269:                if (bit) {
                    270:                        pool_item_bitmap_t mask;
                    271:
                    272:                        bit--;
                    273:                        idx = (i * BITMAP_SIZE) + bit;
                    274:                        mask = 1 << bit;
                    275:                        KASSERT((bitmap[i] & mask) != 0);
                    276:                        bitmap[i] &= ~mask;
                    277:                        break;
                    278:                }
                    279:        }
                    280:        KASSERT(idx < pp->pr_itemsperpage);
1.128     christos  281:        return (char *)ph->ph_page + ph->ph_off + idx * pp->pr_size;
1.97      yamt      282: }
                    283:
1.135     yamt      284: static inline void
1.141     yamt      285: pr_item_notouch_init(const struct pool *pp, struct pool_item_header *ph)
1.135     yamt      286: {
                    287:        pool_item_bitmap_t *bitmap = ph->ph_bitmap;
                    288:        const int n = howmany(pp->pr_itemsperpage, BITMAP_SIZE);
                    289:        int i;
                    290:
                    291:        for (i = 0; i < n; i++) {
                    292:                bitmap[i] = (pool_item_bitmap_t)-1;
                    293:        }
                    294: }
                    295:
1.110     perry     296: static inline int
1.88      chs       297: phtree_compare(struct pool_item_header *a, struct pool_item_header *b)
                    298: {
1.121     yamt      299:
                    300:        /*
                    301:         * we consider pool_item_header with smaller ph_page bigger.
                    302:         * (this unnatural ordering is for the benefit of pr_find_pagehead.)
                    303:         */
                    304:
1.88      chs       305:        if (a->ph_page < b->ph_page)
1.121     yamt      306:                return (1);
                    307:        else if (a->ph_page > b->ph_page)
1.88      chs       308:                return (-1);
                    309:        else
                    310:                return (0);
                    311: }
                    312:
                    313: SPLAY_PROTOTYPE(phtree, pool_item_header, ph_node, phtree_compare);
                    314: SPLAY_GENERATE(phtree, pool_item_header, ph_node, phtree_compare);
                    315:
1.141     yamt      316: static inline struct pool_item_header *
                    317: pr_find_pagehead_noalign(struct pool *pp, void *v)
                    318: {
                    319:        struct pool_item_header *ph, tmp;
                    320:
                    321:        tmp.ph_page = (void *)(uintptr_t)v;
                    322:        ph = SPLAY_FIND(phtree, &pp->pr_phtree, &tmp);
                    323:        if (ph == NULL) {
                    324:                ph = SPLAY_ROOT(&pp->pr_phtree);
                    325:                if (ph != NULL && phtree_compare(&tmp, ph) >= 0) {
                    326:                        ph = SPLAY_NEXT(phtree, &pp->pr_phtree, ph);
                    327:                }
                    328:                KASSERT(ph == NULL || phtree_compare(&tmp, ph) < 0);
                    329:        }
                    330:
                    331:        return ph;
                    332: }
                    333:
1.3       pk        334: /*
1.121     yamt      335:  * Return the pool page header based on item address.
1.3       pk        336:  */
1.110     perry     337: static inline struct pool_item_header *
1.121     yamt      338: pr_find_pagehead(struct pool *pp, void *v)
1.3       pk        339: {
1.88      chs       340:        struct pool_item_header *ph, tmp;
1.3       pk        341:
1.121     yamt      342:        if ((pp->pr_roflags & PR_NOALIGN) != 0) {
1.141     yamt      343:                ph = pr_find_pagehead_noalign(pp, v);
1.121     yamt      344:        } else {
1.128     christos  345:                void *page =
                    346:                    (void *)((uintptr_t)v & pp->pr_alloc->pa_pagemask);
1.121     yamt      347:
                    348:                if ((pp->pr_roflags & PR_PHINPAGE) != 0) {
1.128     christos  349:                        ph = (struct pool_item_header *)((char *)page + pp->pr_phoffset);
1.121     yamt      350:                } else {
                    351:                        tmp.ph_page = page;
                    352:                        ph = SPLAY_FIND(phtree, &pp->pr_phtree, &tmp);
                    353:                }
                    354:        }
1.3       pk        355:
1.121     yamt      356:        KASSERT(ph == NULL || ((pp->pr_roflags & PR_PHINPAGE) != 0) ||
1.128     christos  357:            ((char *)ph->ph_page <= (char *)v &&
                    358:            (char *)v < (char *)ph->ph_page + pp->pr_alloc->pa_pagesz));
1.88      chs       359:        return ph;
1.3       pk        360: }
                    361:
1.101     thorpej   362: static void
                    363: pr_pagelist_free(struct pool *pp, struct pool_pagelist *pq)
                    364: {
                    365:        struct pool_item_header *ph;
                    366:
                    367:        while ((ph = LIST_FIRST(pq)) != NULL) {
                    368:                LIST_REMOVE(ph, ph_pagelist);
                    369:                pool_allocator_free(pp, ph->ph_page);
1.134     ad        370:                if ((pp->pr_roflags & PR_PHINPAGE) == 0)
1.101     thorpej   371:                        pool_put(pp->pr_phpool, ph);
                    372:        }
                    373: }
                    374:
1.3       pk        375: /*
                    376:  * Remove a page from the pool.
                    377:  */
1.110     perry     378: static inline void
1.61      chs       379: pr_rmpage(struct pool *pp, struct pool_item_header *ph,
                    380:      struct pool_pagelist *pq)
1.3       pk        381: {
                    382:
1.134     ad        383:        KASSERT(mutex_owned(&pp->pr_lock));
1.91      yamt      384:
1.3       pk        385:        /*
1.7       thorpej   386:         * If the page was idle, decrement the idle page count.
1.3       pk        387:         */
1.6       thorpej   388:        if (ph->ph_nmissing == 0) {
1.207     riastrad  389:                KASSERT(pp->pr_nidle != 0);
                    390:                KASSERTMSG((pp->pr_nitems >= pp->pr_itemsperpage),
                    391:                    "nitems=%u < itemsperpage=%u",
                    392:                    pp->pr_nitems, pp->pr_itemsperpage);
1.6       thorpej   393:                pp->pr_nidle--;
                    394:        }
1.7       thorpej   395:
1.20      thorpej   396:        pp->pr_nitems -= pp->pr_itemsperpage;
                    397:
1.7       thorpej   398:        /*
1.101     thorpej   399:         * Unlink the page from the pool and queue it for release.
1.7       thorpej   400:         */
1.88      chs       401:        LIST_REMOVE(ph, ph_pagelist);
1.91      yamt      402:        if ((pp->pr_roflags & PR_PHINPAGE) == 0)
                    403:                SPLAY_REMOVE(phtree, &pp->pr_phtree, ph);
1.101     thorpej   404:        LIST_INSERT_HEAD(pq, ph, ph_pagelist);
                    405:
1.7       thorpej   406:        pp->pr_npages--;
                    407:        pp->pr_npagefree++;
1.6       thorpej   408:
1.88      chs       409:        pool_update_curpage(pp);
1.3       pk        410: }
                    411:
                    412: /*
1.94      simonb    413:  * Initialize all the pools listed in the "pools" link set.
                    414:  */
                    415: void
1.117     yamt      416: pool_subsystem_init(void)
1.94      simonb    417: {
1.192     rmind     418:        size_t size;
1.191     para      419:        int idx;
1.94      simonb    420:
1.134     ad        421:        mutex_init(&pool_head_lock, MUTEX_DEFAULT, IPL_NONE);
1.179     mlelstv   422:        mutex_init(&pool_allocator_lock, MUTEX_DEFAULT, IPL_NONE);
1.134     ad        423:        cv_init(&pool_busy, "poolbusy");
                    424:
1.191     para      425:        /*
                    426:         * Initialize private page header pool and cache magazine pool if we
                    427:         * haven't done so yet.
                    428:         */
                    429:        for (idx = 0; idx < PHPOOL_MAX; idx++) {
                    430:                static char phpool_names[PHPOOL_MAX][6+1+6+1];
                    431:                int nelem;
                    432:                size_t sz;
                    433:
                    434:                nelem = PHPOOL_FREELIST_NELEM(idx);
                    435:                snprintf(phpool_names[idx], sizeof(phpool_names[idx]),
                    436:                    "phpool-%d", nelem);
                    437:                sz = sizeof(struct pool_item_header);
                    438:                if (nelem) {
                    439:                        sz = offsetof(struct pool_item_header,
                    440:                            ph_bitmap[howmany(nelem, BITMAP_SIZE)]);
                    441:                }
                    442:                pool_init(&phpool[idx], sz, 0, 0, 0,
                    443:                    phpool_names[idx], &pool_allocator_meta, IPL_VM);
1.117     yamt      444:        }
1.191     para      445: #ifdef POOL_SUBPAGE
                    446:        pool_init(&psppool, POOL_SUBPAGE, POOL_SUBPAGE, 0,
                    447:            PR_RECURSIVE, "psppool", &pool_allocator_meta, IPL_VM);
                    448: #endif
                    449:
                    450:        size = sizeof(pcg_t) +
                    451:            (PCG_NOBJECTS_NORMAL - 1) * sizeof(pcgpair_t);
                    452:        pool_init(&pcg_normal_pool, size, coherency_unit, 0, 0,
                    453:            "pcgnormal", &pool_allocator_meta, IPL_VM);
                    454:
                    455:        size = sizeof(pcg_t) +
                    456:            (PCG_NOBJECTS_LARGE - 1) * sizeof(pcgpair_t);
                    457:        pool_init(&pcg_large_pool, size, coherency_unit, 0, 0,
                    458:            "pcglarge", &pool_allocator_meta, IPL_VM);
1.134     ad        459:
1.156     ad        460:        pool_init(&cache_pool, sizeof(struct pool_cache), coherency_unit,
1.191     para      461:            0, 0, "pcache", &pool_allocator_meta, IPL_NONE);
1.134     ad        462:
1.156     ad        463:        pool_init(&cache_cpu_pool, sizeof(pool_cache_cpu_t), coherency_unit,
1.191     para      464:            0, 0, "pcachecpu", &pool_allocator_meta, IPL_NONE);
1.94      simonb    465: }
                    466:
                    467: /*
1.3       pk        468:  * Initialize the given pool resource structure.
                    469:  *
                    470:  * We export this routine to allow other kernel parts to declare
1.195     rmind     471:  * static pools that must be initialized before kmem(9) is available.
1.3       pk        472:  */
                    473: void
1.42      thorpej   474: pool_init(struct pool *pp, size_t size, u_int align, u_int ioff, int flags,
1.129     ad        475:     const char *wchan, struct pool_allocator *palloc, int ipl)
1.3       pk        476: {
1.116     simonb    477:        struct pool *pp1;
1.204     maxv      478:        size_t trysize, phsize, prsize;
1.134     ad        479:        int off, slack;
1.3       pk        480:
1.116     simonb    481: #ifdef DEBUG
1.198     christos  482:        if (__predict_true(!cold))
                    483:                mutex_enter(&pool_head_lock);
1.116     simonb    484:        /*
                    485:         * Check that the pool hasn't already been initialised and
                    486:         * added to the list of all pools.
                    487:         */
1.145     ad        488:        TAILQ_FOREACH(pp1, &pool_head, pr_poollist) {
1.116     simonb    489:                if (pp == pp1)
1.213     christos  490:                        panic("%s: [%s] already initialised", __func__,
1.116     simonb    491:                            wchan);
                    492:        }
1.198     christos  493:        if (__predict_true(!cold))
                    494:                mutex_exit(&pool_head_lock);
1.116     simonb    495: #endif
                    496:
1.66      thorpej   497:        if (palloc == NULL)
                    498:                palloc = &pool_allocator_kmem;
1.112     bjh21     499: #ifdef POOL_SUBPAGE
                    500:        if (size > palloc->pa_pagesz) {
                    501:                if (palloc == &pool_allocator_kmem)
                    502:                        palloc = &pool_allocator_kmem_fullpage;
                    503:                else if (palloc == &pool_allocator_nointr)
                    504:                        palloc = &pool_allocator_nointr_fullpage;
                    505:        }
1.66      thorpej   506: #endif /* POOL_SUBPAGE */
1.180     mlelstv   507:        if (!cold)
                    508:                mutex_enter(&pool_allocator_lock);
1.178     elad      509:        if (palloc->pa_refcnt++ == 0) {
1.112     bjh21     510:                if (palloc->pa_pagesz == 0)
1.66      thorpej   511:                        palloc->pa_pagesz = PAGE_SIZE;
                    512:
                    513:                TAILQ_INIT(&palloc->pa_list);
                    514:
1.134     ad        515:                mutex_init(&palloc->pa_lock, MUTEX_DEFAULT, IPL_VM);
1.66      thorpej   516:                palloc->pa_pagemask = ~(palloc->pa_pagesz - 1);
                    517:                palloc->pa_pageshift = ffs(palloc->pa_pagesz) - 1;
1.4       thorpej   518:        }
1.180     mlelstv   519:        if (!cold)
                    520:                mutex_exit(&pool_allocator_lock);
1.3       pk        521:
                    522:        if (align == 0)
                    523:                align = ALIGN(1);
1.14      thorpej   524:
1.204     maxv      525:        prsize = size;
                    526:        if ((flags & PR_NOTOUCH) == 0 && prsize < sizeof(struct pool_item))
                    527:                prsize = sizeof(struct pool_item);
1.3       pk        528:
1.204     maxv      529:        prsize = roundup(prsize, align);
1.207     riastrad  530:        KASSERTMSG((prsize <= palloc->pa_pagesz),
1.213     christos  531:            "%s: [%s] pool item size (%zu) larger than page size (%u)",
                    532:            __func__, wchan, prsize, palloc->pa_pagesz);
1.35      pk        533:
1.3       pk        534:        /*
                    535:         * Initialize the pool structure.
                    536:         */
1.88      chs       537:        LIST_INIT(&pp->pr_emptypages);
                    538:        LIST_INIT(&pp->pr_fullpages);
                    539:        LIST_INIT(&pp->pr_partpages);
1.134     ad        540:        pp->pr_cache = NULL;
1.3       pk        541:        pp->pr_curpage = NULL;
                    542:        pp->pr_npages = 0;
                    543:        pp->pr_minitems = 0;
                    544:        pp->pr_minpages = 0;
                    545:        pp->pr_maxpages = UINT_MAX;
1.20      thorpej   546:        pp->pr_roflags = flags;
                    547:        pp->pr_flags = 0;
1.204     maxv      548:        pp->pr_size = prsize;
1.3       pk        549:        pp->pr_align = align;
                    550:        pp->pr_wchan = wchan;
1.66      thorpej   551:        pp->pr_alloc = palloc;
1.20      thorpej   552:        pp->pr_nitems = 0;
                    553:        pp->pr_nout = 0;
                    554:        pp->pr_hardlimit = UINT_MAX;
                    555:        pp->pr_hardlimit_warning = NULL;
1.31      thorpej   556:        pp->pr_hardlimit_ratecap.tv_sec = 0;
                    557:        pp->pr_hardlimit_ratecap.tv_usec = 0;
                    558:        pp->pr_hardlimit_warning_last.tv_sec = 0;
                    559:        pp->pr_hardlimit_warning_last.tv_usec = 0;
1.68      thorpej   560:        pp->pr_drain_hook = NULL;
                    561:        pp->pr_drain_hook_arg = NULL;
1.125     ad        562:        pp->pr_freecheck = NULL;
1.204     maxv      563:        pool_redzone_init(pp, size);
1.3       pk        564:
                    565:        /*
                    566:         * Decide whether to put the page header off page to avoid
1.92      enami     567:         * wasting too large a part of the page or too big item.
                    568:         * Off-page page headers go on a hash table, so we can match
                    569:         * a returned item with its header based on the page address.
                    570:         * We use 1/16 of the page size and about 8 times of the item
                    571:         * size as the threshold (XXX: tune)
                    572:         *
                    573:         * However, we'll put the header into the page if we can put
                    574:         * it without wasting any items.
                    575:         *
                    576:         * Silently enforce `0 <= ioff < align'.
1.3       pk        577:         */
1.92      enami     578:        pp->pr_itemoffset = ioff %= align;
                    579:        /* See the comment below about reserved bytes. */
                    580:        trysize = palloc->pa_pagesz - ((align - ioff) % align);
                    581:        phsize = ALIGN(sizeof(struct pool_item_header));
1.201     para      582:        if (pp->pr_roflags & PR_PHINPAGE ||
                    583:            ((pp->pr_roflags & (PR_NOTOUCH | PR_NOALIGN)) == 0 &&
1.97      yamt      584:            (pp->pr_size < MIN(palloc->pa_pagesz / 16, phsize << 3) ||
1.201     para      585:            trysize / pp->pr_size == (trysize - phsize) / pp->pr_size))) {
1.3       pk        586:                /* Use the end of the page for the page header */
1.20      thorpej   587:                pp->pr_roflags |= PR_PHINPAGE;
1.92      enami     588:                pp->pr_phoffset = off = palloc->pa_pagesz - phsize;
1.2       pk        589:        } else {
1.3       pk        590:                /* The page header will be taken from our page header pool */
                    591:                pp->pr_phoffset = 0;
1.66      thorpej   592:                off = palloc->pa_pagesz;
1.88      chs       593:                SPLAY_INIT(&pp->pr_phtree);
1.2       pk        594:        }
1.1       pk        595:
1.3       pk        596:        /*
                    597:         * Alignment is to take place at `ioff' within the item. This means
                    598:         * we must reserve up to `align - 1' bytes on the page to allow
                    599:         * appropriate positioning of each item.
                    600:         */
                    601:        pp->pr_itemsperpage = (off - ((align - ioff) % align)) / pp->pr_size;
1.43      thorpej   602:        KASSERT(pp->pr_itemsperpage != 0);
1.97      yamt      603:        if ((pp->pr_roflags & PR_NOTOUCH)) {
                    604:                int idx;
                    605:
                    606:                for (idx = 0; pp->pr_itemsperpage > PHPOOL_FREELIST_NELEM(idx);
                    607:                    idx++) {
                    608:                        /* nothing */
                    609:                }
                    610:                if (idx >= PHPOOL_MAX) {
                    611:                        /*
                    612:                         * if you see this panic, consider to tweak
                    613:                         * PHPOOL_MAX and PHPOOL_FREELIST_NELEM.
                    614:                         */
1.213     christos  615:                        panic("%s: [%s] too large itemsperpage(%d) for "
                    616:                            "PR_NOTOUCH", __func__,
1.97      yamt      617:                            pp->pr_wchan, pp->pr_itemsperpage);
                    618:                }
                    619:                pp->pr_phpool = &phpool[idx];
                    620:        } else if ((pp->pr_roflags & PR_PHINPAGE) == 0) {
                    621:                pp->pr_phpool = &phpool[0];
                    622:        }
                    623: #if defined(DIAGNOSTIC)
                    624:        else {
                    625:                pp->pr_phpool = NULL;
                    626:        }
                    627: #endif
1.3       pk        628:
                    629:        /*
                    630:         * Use the slack between the chunks and the page header
                    631:         * for "cache coloring".
                    632:         */
                    633:        slack = off - pp->pr_itemsperpage * pp->pr_size;
                    634:        pp->pr_maxcolor = (slack / align) * align;
                    635:        pp->pr_curcolor = 0;
                    636:
                    637:        pp->pr_nget = 0;
                    638:        pp->pr_nfail = 0;
                    639:        pp->pr_nput = 0;
                    640:        pp->pr_npagealloc = 0;
                    641:        pp->pr_npagefree = 0;
1.1       pk        642:        pp->pr_hiwat = 0;
1.8       thorpej   643:        pp->pr_nidle = 0;
1.134     ad        644:        pp->pr_refcnt = 0;
1.3       pk        645:
1.157     ad        646:        mutex_init(&pp->pr_lock, MUTEX_DEFAULT, ipl);
1.134     ad        647:        cv_init(&pp->pr_cv, wchan);
                    648:        pp->pr_ipl = ipl;
1.1       pk        649:
1.145     ad        650:        /* Insert into the list of all pools. */
1.181     mlelstv   651:        if (!cold)
1.134     ad        652:                mutex_enter(&pool_head_lock);
1.145     ad        653:        TAILQ_FOREACH(pp1, &pool_head, pr_poollist) {
                    654:                if (strcmp(pp1->pr_wchan, pp->pr_wchan) > 0)
                    655:                        break;
                    656:        }
                    657:        if (pp1 == NULL)
                    658:                TAILQ_INSERT_TAIL(&pool_head, pp, pr_poollist);
                    659:        else
                    660:                TAILQ_INSERT_BEFORE(pp1, pp, pr_poollist);
1.181     mlelstv   661:        if (!cold)
1.134     ad        662:                mutex_exit(&pool_head_lock);
                    663:
1.167     skrll     664:        /* Insert this into the list of pools using this allocator. */
1.181     mlelstv   665:        if (!cold)
1.134     ad        666:                mutex_enter(&palloc->pa_lock);
1.145     ad        667:        TAILQ_INSERT_TAIL(&palloc->pa_list, pp, pr_alloc_list);
1.181     mlelstv   668:        if (!cold)
1.134     ad        669:                mutex_exit(&palloc->pa_lock);
1.1       pk        670: }
                    671:
                    672: /*
                    673:  * De-commision a pool resource.
                    674:  */
                    675: void
1.42      thorpej   676: pool_destroy(struct pool *pp)
1.1       pk        677: {
1.101     thorpej   678:        struct pool_pagelist pq;
1.3       pk        679:        struct pool_item_header *ph;
1.43      thorpej   680:
1.101     thorpej   681:        /* Remove from global pool list */
1.134     ad        682:        mutex_enter(&pool_head_lock);
                    683:        while (pp->pr_refcnt != 0)
                    684:                cv_wait(&pool_busy, &pool_head_lock);
1.145     ad        685:        TAILQ_REMOVE(&pool_head, pp, pr_poollist);
1.101     thorpej   686:        if (drainpp == pp)
                    687:                drainpp = NULL;
1.134     ad        688:        mutex_exit(&pool_head_lock);
1.101     thorpej   689:
                    690:        /* Remove this pool from its allocator's list of pools. */
1.134     ad        691:        mutex_enter(&pp->pr_alloc->pa_lock);
1.66      thorpej   692:        TAILQ_REMOVE(&pp->pr_alloc->pa_list, pp, pr_alloc_list);
1.134     ad        693:        mutex_exit(&pp->pr_alloc->pa_lock);
1.66      thorpej   694:
1.178     elad      695:        mutex_enter(&pool_allocator_lock);
                    696:        if (--pp->pr_alloc->pa_refcnt == 0)
                    697:                mutex_destroy(&pp->pr_alloc->pa_lock);
                    698:        mutex_exit(&pool_allocator_lock);
                    699:
1.134     ad        700:        mutex_enter(&pp->pr_lock);
1.101     thorpej   701:
1.134     ad        702:        KASSERT(pp->pr_cache == NULL);
1.207     riastrad  703:        KASSERTMSG((pp->pr_nout == 0),
1.213     christos  704:            "%s: pool busy: still out: %u", __func__, pp->pr_nout);
1.101     thorpej   705:        KASSERT(LIST_EMPTY(&pp->pr_fullpages));
                    706:        KASSERT(LIST_EMPTY(&pp->pr_partpages));
                    707:
1.3       pk        708:        /* Remove all pages */
1.101     thorpej   709:        LIST_INIT(&pq);
1.88      chs       710:        while ((ph = LIST_FIRST(&pp->pr_emptypages)) != NULL)
1.101     thorpej   711:                pr_rmpage(pp, ph, &pq);
                    712:
1.134     ad        713:        mutex_exit(&pp->pr_lock);
1.3       pk        714:
1.101     thorpej   715:        pr_pagelist_free(pp, &pq);
1.134     ad        716:        cv_destroy(&pp->pr_cv);
                    717:        mutex_destroy(&pp->pr_lock);
1.1       pk        718: }
                    719:
1.68      thorpej   720: void
                    721: pool_set_drain_hook(struct pool *pp, void (*fn)(void *, int), void *arg)
                    722: {
                    723:
                    724:        /* XXX no locking -- must be used just after pool_init() */
1.207     riastrad  725:        KASSERTMSG((pp->pr_drain_hook == NULL),
1.213     christos  726:            "%s: [%s] already set", __func__, pp->pr_wchan);
1.68      thorpej   727:        pp->pr_drain_hook = fn;
                    728:        pp->pr_drain_hook_arg = arg;
                    729: }
                    730:
1.88      chs       731: static struct pool_item_header *
1.128     christos  732: pool_alloc_item_header(struct pool *pp, void *storage, int flags)
1.55      thorpej   733: {
                    734:        struct pool_item_header *ph;
                    735:
                    736:        if ((pp->pr_roflags & PR_PHINPAGE) != 0)
1.213     christos  737:                ph = (void *)((char *)storage + pp->pr_phoffset);
1.134     ad        738:        else
1.97      yamt      739:                ph = pool_get(pp->pr_phpool, flags);
1.55      thorpej   740:
                    741:        return (ph);
                    742: }
1.1       pk        743:
                    744: /*
1.134     ad        745:  * Grab an item from the pool.
1.1       pk        746:  */
1.3       pk        747: void *
1.56      sommerfe  748: pool_get(struct pool *pp, int flags)
1.1       pk        749: {
                    750:        struct pool_item *pi;
1.3       pk        751:        struct pool_item_header *ph;
1.55      thorpej   752:        void *v;
1.1       pk        753:
1.215     christos  754:        KASSERT(!(flags & PR_NOWAIT) != !(flags & PR_WAITOK));
1.207     riastrad  755:        KASSERTMSG((pp->pr_itemsperpage != 0),
1.213     christos  756:            "%s: [%s] pr_itemsperpage is zero, "
                    757:            "pool not initialized?", __func__, pp->pr_wchan);
1.207     riastrad  758:        KASSERTMSG((!(cpu_intr_p() || cpu_softintr_p())
                    759:                || pp->pr_ipl != IPL_NONE || cold || panicstr != NULL),
1.213     christos  760:            "%s: [%s] is IPL_NONE, but called from interrupt context",
                    761:            __func__, pp->pr_wchan);
1.155     ad        762:        if (flags & PR_WAITOK) {
1.154     yamt      763:                ASSERT_SLEEPABLE();
1.155     ad        764:        }
1.1       pk        765:
1.134     ad        766:        mutex_enter(&pp->pr_lock);
1.20      thorpej   767:  startover:
                    768:        /*
                    769:         * Check to see if we've reached the hard limit.  If we have,
                    770:         * and we can wait, then wait until an item has been returned to
                    771:         * the pool.
                    772:         */
1.207     riastrad  773:        KASSERTMSG((pp->pr_nout <= pp->pr_hardlimit),
1.213     christos  774:            "%s: %s: crossed hard limit", __func__, pp->pr_wchan);
1.34      thorpej   775:        if (__predict_false(pp->pr_nout == pp->pr_hardlimit)) {
1.68      thorpej   776:                if (pp->pr_drain_hook != NULL) {
                    777:                        /*
                    778:                         * Since the drain hook is going to free things
                    779:                         * back to the pool, unlock, call the hook, re-lock,
                    780:                         * and check the hardlimit condition again.
                    781:                         */
1.134     ad        782:                        mutex_exit(&pp->pr_lock);
1.68      thorpej   783:                        (*pp->pr_drain_hook)(pp->pr_drain_hook_arg, flags);
1.134     ad        784:                        mutex_enter(&pp->pr_lock);
1.68      thorpej   785:                        if (pp->pr_nout < pp->pr_hardlimit)
                    786:                                goto startover;
                    787:                }
                    788:
1.29      sommerfe  789:                if ((flags & PR_WAITOK) && !(flags & PR_LIMITFAIL)) {
1.20      thorpej   790:                        /*
                    791:                         * XXX: A warning isn't logged in this case.  Should
                    792:                         * it be?
                    793:                         */
                    794:                        pp->pr_flags |= PR_WANTED;
1.212     christos  795:                        do {
                    796:                                cv_wait(&pp->pr_cv, &pp->pr_lock);
                    797:                        } while (pp->pr_flags & PR_WANTED);
1.20      thorpej   798:                        goto startover;
                    799:                }
1.31      thorpej   800:
                    801:                /*
                    802:                 * Log a message that the hard limit has been hit.
                    803:                 */
                    804:                if (pp->pr_hardlimit_warning != NULL &&
                    805:                    ratecheck(&pp->pr_hardlimit_warning_last,
                    806:                              &pp->pr_hardlimit_ratecap))
                    807:                        log(LOG_ERR, "%s\n", pp->pr_hardlimit_warning);
1.21      thorpej   808:
                    809:                pp->pr_nfail++;
                    810:
1.134     ad        811:                mutex_exit(&pp->pr_lock);
1.216     christos  812:                KASSERT((flags & (PR_NOWAIT|PR_LIMITFAIL)) != 0);
1.20      thorpej   813:                return (NULL);
                    814:        }
                    815:
1.3       pk        816:        /*
                    817:         * The convention we use is that if `curpage' is not NULL, then
                    818:         * it points at a non-empty bucket. In particular, `curpage'
                    819:         * never points at a page header which has PR_PHINPAGE set and
                    820:         * has no items in its bucket.
                    821:         */
1.20      thorpej   822:        if ((ph = pp->pr_curpage) == NULL) {
1.113     yamt      823:                int error;
                    824:
1.207     riastrad  825:                KASSERTMSG((pp->pr_nitems == 0),
1.213     christos  826:                    "%s: [%s] curpage NULL, inconsistent nitems %u",
                    827:                    __func__, pp->pr_wchan, pp->pr_nitems);
1.20      thorpej   828:
1.21      thorpej   829:                /*
                    830:                 * Call the back-end page allocator for more memory.
                    831:                 * Release the pool lock, as the back-end page allocator
                    832:                 * may block.
                    833:                 */
1.113     yamt      834:                error = pool_grow(pp, flags);
                    835:                if (error != 0) {
1.21      thorpej   836:                        /*
1.210     mlelstv   837:                         * pool_grow aborts when another thread
                    838:                         * is allocating a new page. Retry if it
                    839:                         * waited for it.
                    840:                         */
                    841:                        if (error == ERESTART)
                    842:                                goto startover;
                    843:
                    844:                        /*
1.55      thorpej   845:                         * We were unable to allocate a page or item
                    846:                         * header, but we released the lock during
                    847:                         * allocation, so perhaps items were freed
                    848:                         * back to the pool.  Check for this case.
1.21      thorpej   849:                         */
                    850:                        if (pp->pr_curpage != NULL)
                    851:                                goto startover;
1.15      pk        852:
1.117     yamt      853:                        pp->pr_nfail++;
1.134     ad        854:                        mutex_exit(&pp->pr_lock);
1.211     riastrad  855:                        KASSERT((flags & (PR_WAITOK|PR_NOWAIT)) == PR_NOWAIT);
1.117     yamt      856:                        return (NULL);
1.1       pk        857:                }
1.3       pk        858:
1.20      thorpej   859:                /* Start the allocation process over. */
                    860:                goto startover;
1.3       pk        861:        }
1.97      yamt      862:        if (pp->pr_roflags & PR_NOTOUCH) {
1.207     riastrad  863:                KASSERTMSG((ph->ph_nmissing < pp->pr_itemsperpage),
1.213     christos  864:                    "%s: %s: page empty", __func__, pp->pr_wchan);
1.97      yamt      865:                v = pr_item_notouch_get(pp, ph);
                    866:        } else {
1.102     chs       867:                v = pi = LIST_FIRST(&ph->ph_itemlist);
1.97      yamt      868:                if (__predict_false(v == NULL)) {
1.134     ad        869:                        mutex_exit(&pp->pr_lock);
1.213     christos  870:                        panic("%s: [%s] page empty", __func__, pp->pr_wchan);
1.97      yamt      871:                }
1.207     riastrad  872:                KASSERTMSG((pp->pr_nitems > 0),
1.213     christos  873:                    "%s: [%s] nitems %u inconsistent on itemlist",
                    874:                    __func__, pp->pr_wchan, pp->pr_nitems);
1.207     riastrad  875:                KASSERTMSG((pi->pi_magic == PI_MAGIC),
1.213     christos  876:                    "%s: [%s] free list modified: "
                    877:                    "magic=%x; page %p; item addr %p", __func__,
1.207     riastrad  878:                    pp->pr_wchan, pi->pi_magic, ph->ph_page, pi);
1.3       pk        879:
1.97      yamt      880:                /*
                    881:                 * Remove from item list.
                    882:                 */
1.102     chs       883:                LIST_REMOVE(pi, pi_list);
1.97      yamt      884:        }
1.20      thorpej   885:        pp->pr_nitems--;
                    886:        pp->pr_nout++;
1.6       thorpej   887:        if (ph->ph_nmissing == 0) {
1.207     riastrad  888:                KASSERT(pp->pr_nidle > 0);
1.6       thorpej   889:                pp->pr_nidle--;
1.88      chs       890:
                    891:                /*
                    892:                 * This page was previously empty.  Move it to the list of
                    893:                 * partially-full pages.  This page is already curpage.
                    894:                 */
                    895:                LIST_REMOVE(ph, ph_pagelist);
                    896:                LIST_INSERT_HEAD(&pp->pr_partpages, ph, ph_pagelist);
1.6       thorpej   897:        }
1.3       pk        898:        ph->ph_nmissing++;
1.97      yamt      899:        if (ph->ph_nmissing == pp->pr_itemsperpage) {
1.207     riastrad  900:                KASSERTMSG(((pp->pr_roflags & PR_NOTOUCH) ||
                    901:                        LIST_EMPTY(&ph->ph_itemlist)),
1.213     christos  902:                    "%s: [%s] nmissing (%u) inconsistent", __func__,
                    903:                        pp->pr_wchan, ph->ph_nmissing);
1.3       pk        904:                /*
1.88      chs       905:                 * This page is now full.  Move it to the full list
                    906:                 * and select a new current page.
1.3       pk        907:                 */
1.88      chs       908:                LIST_REMOVE(ph, ph_pagelist);
                    909:                LIST_INSERT_HEAD(&pp->pr_fullpages, ph, ph_pagelist);
                    910:                pool_update_curpage(pp);
1.1       pk        911:        }
1.3       pk        912:
                    913:        pp->pr_nget++;
1.20      thorpej   914:
                    915:        /*
                    916:         * If we have a low water mark and we are now below that low
                    917:         * water mark, add more items to the pool.
                    918:         */
1.53      thorpej   919:        if (POOL_NEEDS_CATCHUP(pp) && pool_catchup(pp) != 0) {
1.20      thorpej   920:                /*
                    921:                 * XXX: Should we log a warning?  Should we set up a timeout
                    922:                 * to try again in a second or so?  The latter could break
                    923:                 * a caller's assumptions about interrupt protection, etc.
                    924:                 */
                    925:        }
                    926:
1.134     ad        927:        mutex_exit(&pp->pr_lock);
1.125     ad        928:        KASSERT((((vaddr_t)v + pp->pr_itemoffset) & (pp->pr_align - 1)) == 0);
                    929:        FREECHECK_OUT(&pp->pr_freecheck, v);
1.204     maxv      930:        pool_redzone_fill(pp, v);
1.1       pk        931:        return (v);
                    932: }
                    933:
                    934: /*
1.43      thorpej   935:  * Internal version of pool_put().  Pool is already locked/entered.
1.1       pk        936:  */
1.43      thorpej   937: static void
1.101     thorpej   938: pool_do_put(struct pool *pp, void *v, struct pool_pagelist *pq)
1.1       pk        939: {
                    940:        struct pool_item *pi = v;
1.3       pk        941:        struct pool_item_header *ph;
                    942:
1.134     ad        943:        KASSERT(mutex_owned(&pp->pr_lock));
1.204     maxv      944:        pool_redzone_check(pp, v);
1.125     ad        945:        FREECHECK_IN(&pp->pr_freecheck, v);
1.134     ad        946:        LOCKDEBUG_MEM_CHECK(v, pp->pr_size);
1.61      chs       947:
1.207     riastrad  948:        KASSERTMSG((pp->pr_nout > 0),
1.213     christos  949:            "%s: [%s] putting with none out", __func__, pp->pr_wchan);
1.3       pk        950:
1.121     yamt      951:        if (__predict_false((ph = pr_find_pagehead(pp, v)) == NULL)) {
1.213     christos  952:                panic("%s: [%s] page header missing", __func__,  pp->pr_wchan);
1.3       pk        953:        }
1.28      thorpej   954:
1.3       pk        955:        /*
                    956:         * Return to item list.
                    957:         */
1.97      yamt      958:        if (pp->pr_roflags & PR_NOTOUCH) {
                    959:                pr_item_notouch_put(pp, ph, v);
                    960:        } else {
1.2       pk        961: #ifdef DIAGNOSTIC
1.97      yamt      962:                pi->pi_magic = PI_MAGIC;
1.3       pk        963: #endif
1.32      chs       964: #ifdef DEBUG
1.97      yamt      965:                {
                    966:                        int i, *ip = v;
1.32      chs       967:
1.97      yamt      968:                        for (i = 0; i < pp->pr_size / sizeof(int); i++) {
                    969:                                *ip++ = PI_MAGIC;
                    970:                        }
1.32      chs       971:                }
                    972: #endif
                    973:
1.102     chs       974:                LIST_INSERT_HEAD(&ph->ph_itemlist, pi, pi_list);
1.97      yamt      975:        }
1.79      thorpej   976:        KDASSERT(ph->ph_nmissing != 0);
1.3       pk        977:        ph->ph_nmissing--;
                    978:        pp->pr_nput++;
1.20      thorpej   979:        pp->pr_nitems++;
                    980:        pp->pr_nout--;
1.3       pk        981:
                    982:        /* Cancel "pool empty" condition if it exists */
                    983:        if (pp->pr_curpage == NULL)
                    984:                pp->pr_curpage = ph;
                    985:
                    986:        if (pp->pr_flags & PR_WANTED) {
                    987:                pp->pr_flags &= ~PR_WANTED;
1.134     ad        988:                cv_broadcast(&pp->pr_cv);
1.3       pk        989:        }
                    990:
                    991:        /*
1.88      chs       992:         * If this page is now empty, do one of two things:
1.21      thorpej   993:         *
1.88      chs       994:         *      (1) If we have more pages than the page high water mark,
1.96      thorpej   995:         *          free the page back to the system.  ONLY CONSIDER
1.90      thorpej   996:         *          FREEING BACK A PAGE IF WE HAVE MORE THAN OUR MINIMUM PAGE
                    997:         *          CLAIM.
1.21      thorpej   998:         *
1.88      chs       999:         *      (2) Otherwise, move the page to the empty page list.
                   1000:         *
                   1001:         * Either way, select a new current page (so we use a partially-full
                   1002:         * page if one is available).
1.3       pk       1003:         */
                   1004:        if (ph->ph_nmissing == 0) {
1.6       thorpej  1005:                pp->pr_nidle++;
1.90      thorpej  1006:                if (pp->pr_npages > pp->pr_minpages &&
1.152     yamt     1007:                    pp->pr_npages > pp->pr_maxpages) {
1.101     thorpej  1008:                        pr_rmpage(pp, ph, pq);
1.3       pk       1009:                } else {
1.88      chs      1010:                        LIST_REMOVE(ph, ph_pagelist);
                   1011:                        LIST_INSERT_HEAD(&pp->pr_emptypages, ph, ph_pagelist);
1.3       pk       1012:
1.21      thorpej  1013:                        /*
                   1014:                         * Update the timestamp on the page.  A page must
                   1015:                         * be idle for some period of time before it can
                   1016:                         * be reclaimed by the pagedaemon.  This minimizes
                   1017:                         * ping-pong'ing for memory.
1.151     yamt     1018:                         *
                   1019:                         * note for 64-bit time_t: truncating to 32-bit is not
                   1020:                         * a problem for our usage.
1.21      thorpej  1021:                         */
1.151     yamt     1022:                        ph->ph_time = time_uptime;
1.1       pk       1023:                }
1.88      chs      1024:                pool_update_curpage(pp);
1.1       pk       1025:        }
1.88      chs      1026:
1.21      thorpej  1027:        /*
1.88      chs      1028:         * If the page was previously completely full, move it to the
                   1029:         * partially-full list and make it the current page.  The next
                   1030:         * allocation will get the item from this page, instead of
                   1031:         * further fragmenting the pool.
1.21      thorpej  1032:         */
                   1033:        else if (ph->ph_nmissing == (pp->pr_itemsperpage - 1)) {
1.88      chs      1034:                LIST_REMOVE(ph, ph_pagelist);
                   1035:                LIST_INSERT_HEAD(&pp->pr_partpages, ph, ph_pagelist);
1.21      thorpej  1036:                pp->pr_curpage = ph;
                   1037:        }
1.43      thorpej  1038: }
                   1039:
1.56      sommerfe 1040: void
                   1041: pool_put(struct pool *pp, void *v)
                   1042: {
1.101     thorpej  1043:        struct pool_pagelist pq;
                   1044:
                   1045:        LIST_INIT(&pq);
1.56      sommerfe 1046:
1.134     ad       1047:        mutex_enter(&pp->pr_lock);
1.101     thorpej  1048:        pool_do_put(pp, v, &pq);
1.134     ad       1049:        mutex_exit(&pp->pr_lock);
1.56      sommerfe 1050:
1.102     chs      1051:        pr_pagelist_free(pp, &pq);
1.56      sommerfe 1052: }
1.57      sommerfe 1053:
1.74      thorpej  1054: /*
1.113     yamt     1055:  * pool_grow: grow a pool by a page.
                   1056:  *
                   1057:  * => called with pool locked.
                   1058:  * => unlock and relock the pool.
                   1059:  * => return with pool locked.
                   1060:  */
                   1061:
                   1062: static int
                   1063: pool_grow(struct pool *pp, int flags)
                   1064: {
1.209     riastrad 1065:        /*
                   1066:         * If there's a pool_grow in progress, wait for it to complete
                   1067:         * and try again from the top.
                   1068:         */
                   1069:        if (pp->pr_flags & PR_GROWING) {
                   1070:                if (flags & PR_WAITOK) {
                   1071:                        do {
                   1072:                                cv_wait(&pp->pr_cv, &pp->pr_lock);
                   1073:                        } while (pp->pr_flags & PR_GROWING);
                   1074:                        return ERESTART;
                   1075:                } else {
                   1076:                        return EWOULDBLOCK;
                   1077:                }
                   1078:        }
                   1079:        pp->pr_flags |= PR_GROWING;
1.113     yamt     1080:
1.134     ad       1081:        mutex_exit(&pp->pr_lock);
1.216     christos 1082:        char *cp = pool_allocator_alloc(pp, flags);
                   1083:        if (__predict_false(cp == NULL))
                   1084:                goto out;
                   1085:
                   1086:        struct pool_item_header *ph = pool_alloc_item_header(pp, cp, flags);
                   1087:        if (__predict_false(ph == NULL)) {
                   1088:                pool_allocator_free(pp, cp);
1.209     riastrad 1089:                goto out;
1.113     yamt     1090:        }
                   1091:
1.134     ad       1092:        mutex_enter(&pp->pr_lock);
1.113     yamt     1093:        pool_prime_page(pp, cp, ph);
                   1094:        pp->pr_npagealloc++;
1.216     christos 1095:        KASSERT(pp->pr_flags & PR_GROWING);
                   1096:        pp->pr_flags &= ~PR_GROWING;
1.209     riastrad 1097:        /*
                   1098:         * If anyone was waiting for pool_grow, notify them that we
                   1099:         * may have just done it.
                   1100:         */
1.216     christos 1101:        cv_broadcast(&pp->pr_cv);
                   1102:        return 0;
                   1103: out:
1.209     riastrad 1104:        KASSERT(pp->pr_flags & PR_GROWING);
                   1105:        pp->pr_flags &= ~PR_GROWING;
1.216     christos 1106:        mutex_enter(&pp->pr_lock);
                   1107:        return ENOMEM;
1.113     yamt     1108: }
                   1109:
                   1110: /*
1.74      thorpej  1111:  * Add N items to the pool.
                   1112:  */
                   1113: int
                   1114: pool_prime(struct pool *pp, int n)
                   1115: {
1.75      simonb   1116:        int newpages;
1.113     yamt     1117:        int error = 0;
1.74      thorpej  1118:
1.134     ad       1119:        mutex_enter(&pp->pr_lock);
1.74      thorpej  1120:
                   1121:        newpages = roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage;
                   1122:
1.216     christos 1123:        while (newpages > 0) {
1.113     yamt     1124:                error = pool_grow(pp, PR_NOWAIT);
                   1125:                if (error) {
1.214     christos 1126:                        if (error == ERESTART)
                   1127:                                continue;
1.74      thorpej  1128:                        break;
                   1129:                }
                   1130:                pp->pr_minpages++;
1.216     christos 1131:                newpages--;
1.74      thorpej  1132:        }
                   1133:
                   1134:        if (pp->pr_minpages >= pp->pr_maxpages)
                   1135:                pp->pr_maxpages = pp->pr_minpages + 1;  /* XXX */
                   1136:
1.134     ad       1137:        mutex_exit(&pp->pr_lock);
1.113     yamt     1138:        return error;
1.74      thorpej  1139: }
1.55      thorpej  1140:
                   1141: /*
1.3       pk       1142:  * Add a page worth of items to the pool.
1.21      thorpej  1143:  *
                   1144:  * Note, we must be called with the pool descriptor LOCKED.
1.3       pk       1145:  */
1.55      thorpej  1146: static void
1.128     christos 1147: pool_prime_page(struct pool *pp, void *storage, struct pool_item_header *ph)
1.3       pk       1148: {
                   1149:        struct pool_item *pi;
1.128     christos 1150:        void *cp = storage;
1.125     ad       1151:        const unsigned int align = pp->pr_align;
                   1152:        const unsigned int ioff = pp->pr_itemoffset;
1.55      thorpej  1153:        int n;
1.36      pk       1154:
1.134     ad       1155:        KASSERT(mutex_owned(&pp->pr_lock));
1.207     riastrad 1156:        KASSERTMSG(((pp->pr_roflags & PR_NOALIGN) ||
                   1157:                (((uintptr_t)cp & (pp->pr_alloc->pa_pagesz - 1)) == 0)),
1.213     christos 1158:            "%s: [%s] unaligned page: %p", __func__, pp->pr_wchan, cp);
1.3       pk       1159:
                   1160:        /*
                   1161:         * Insert page header.
                   1162:         */
1.88      chs      1163:        LIST_INSERT_HEAD(&pp->pr_emptypages, ph, ph_pagelist);
1.102     chs      1164:        LIST_INIT(&ph->ph_itemlist);
1.3       pk       1165:        ph->ph_page = storage;
                   1166:        ph->ph_nmissing = 0;
1.151     yamt     1167:        ph->ph_time = time_uptime;
1.88      chs      1168:        if ((pp->pr_roflags & PR_PHINPAGE) == 0)
                   1169:                SPLAY_INSERT(phtree, &pp->pr_phtree, ph);
1.3       pk       1170:
1.6       thorpej  1171:        pp->pr_nidle++;
                   1172:
1.3       pk       1173:        /*
                   1174:         * Color this page.
                   1175:         */
1.141     yamt     1176:        ph->ph_off = pp->pr_curcolor;
                   1177:        cp = (char *)cp + ph->ph_off;
1.3       pk       1178:        if ((pp->pr_curcolor += align) > pp->pr_maxcolor)
                   1179:                pp->pr_curcolor = 0;
                   1180:
                   1181:        /*
                   1182:         * Adjust storage to apply aligment to `pr_itemoffset' in each item.
                   1183:         */
                   1184:        if (ioff != 0)
1.128     christos 1185:                cp = (char *)cp + align - ioff;
1.3       pk       1186:
1.125     ad       1187:        KASSERT((((vaddr_t)cp + ioff) & (align - 1)) == 0);
                   1188:
1.3       pk       1189:        /*
                   1190:         * Insert remaining chunks on the bucket list.
                   1191:         */
                   1192:        n = pp->pr_itemsperpage;
1.20      thorpej  1193:        pp->pr_nitems += n;
1.3       pk       1194:
1.97      yamt     1195:        if (pp->pr_roflags & PR_NOTOUCH) {
1.141     yamt     1196:                pr_item_notouch_init(pp, ph);
1.97      yamt     1197:        } else {
                   1198:                while (n--) {
                   1199:                        pi = (struct pool_item *)cp;
1.78      thorpej  1200:
1.97      yamt     1201:                        KASSERT(((((vaddr_t)pi) + ioff) & (align - 1)) == 0);
1.3       pk       1202:
1.97      yamt     1203:                        /* Insert on page list */
1.102     chs      1204:                        LIST_INSERT_HEAD(&ph->ph_itemlist, pi, pi_list);
1.3       pk       1205: #ifdef DIAGNOSTIC
1.97      yamt     1206:                        pi->pi_magic = PI_MAGIC;
1.3       pk       1207: #endif
1.128     christos 1208:                        cp = (char *)cp + pp->pr_size;
1.125     ad       1209:
                   1210:                        KASSERT((((vaddr_t)cp + ioff) & (align - 1)) == 0);
1.97      yamt     1211:                }
1.3       pk       1212:        }
                   1213:
                   1214:        /*
                   1215:         * If the pool was depleted, point at the new page.
                   1216:         */
                   1217:        if (pp->pr_curpage == NULL)
                   1218:                pp->pr_curpage = ph;
                   1219:
                   1220:        if (++pp->pr_npages > pp->pr_hiwat)
                   1221:                pp->pr_hiwat = pp->pr_npages;
                   1222: }
                   1223:
1.20      thorpej  1224: /*
1.52      thorpej  1225:  * Used by pool_get() when nitems drops below the low water mark.  This
1.88      chs      1226:  * is used to catch up pr_nitems with the low water mark.
1.20      thorpej  1227:  *
1.21      thorpej  1228:  * Note 1, we never wait for memory here, we let the caller decide what to do.
1.20      thorpej  1229:  *
1.73      thorpej  1230:  * Note 2, we must be called with the pool already locked, and we return
1.20      thorpej  1231:  * with it locked.
                   1232:  */
                   1233: static int
1.42      thorpej  1234: pool_catchup(struct pool *pp)
1.20      thorpej  1235: {
                   1236:        int error = 0;
                   1237:
1.54      thorpej  1238:        while (POOL_NEEDS_CATCHUP(pp)) {
1.113     yamt     1239:                error = pool_grow(pp, PR_NOWAIT);
                   1240:                if (error) {
1.214     christos 1241:                        if (error == ERESTART)
                   1242:                                continue;
1.20      thorpej  1243:                        break;
                   1244:                }
                   1245:        }
1.113     yamt     1246:        return error;
1.20      thorpej  1247: }
                   1248:
1.88      chs      1249: static void
                   1250: pool_update_curpage(struct pool *pp)
                   1251: {
                   1252:
                   1253:        pp->pr_curpage = LIST_FIRST(&pp->pr_partpages);
                   1254:        if (pp->pr_curpage == NULL) {
                   1255:                pp->pr_curpage = LIST_FIRST(&pp->pr_emptypages);
                   1256:        }
1.168     yamt     1257:        KASSERT((pp->pr_curpage == NULL && pp->pr_nitems == 0) ||
                   1258:            (pp->pr_curpage != NULL && pp->pr_nitems > 0));
1.88      chs      1259: }
                   1260:
1.3       pk       1261: void
1.42      thorpej  1262: pool_setlowat(struct pool *pp, int n)
1.3       pk       1263: {
1.15      pk       1264:
1.134     ad       1265:        mutex_enter(&pp->pr_lock);
1.21      thorpej  1266:
1.3       pk       1267:        pp->pr_minitems = n;
1.15      pk       1268:        pp->pr_minpages = (n == 0)
                   1269:                ? 0
1.18      thorpej  1270:                : roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage;
1.20      thorpej  1271:
                   1272:        /* Make sure we're caught up with the newly-set low water mark. */
1.75      simonb   1273:        if (POOL_NEEDS_CATCHUP(pp) && pool_catchup(pp) != 0) {
1.20      thorpej  1274:                /*
                   1275:                 * XXX: Should we log a warning?  Should we set up a timeout
                   1276:                 * to try again in a second or so?  The latter could break
                   1277:                 * a caller's assumptions about interrupt protection, etc.
                   1278:                 */
                   1279:        }
1.21      thorpej  1280:
1.134     ad       1281:        mutex_exit(&pp->pr_lock);
1.3       pk       1282: }
                   1283:
                   1284: void
1.42      thorpej  1285: pool_sethiwat(struct pool *pp, int n)
1.3       pk       1286: {
1.15      pk       1287:
1.134     ad       1288:        mutex_enter(&pp->pr_lock);
1.21      thorpej  1289:
1.15      pk       1290:        pp->pr_maxpages = (n == 0)
                   1291:                ? 0
1.18      thorpej  1292:                : roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage;
1.21      thorpej  1293:
1.134     ad       1294:        mutex_exit(&pp->pr_lock);
1.3       pk       1295: }
                   1296:
1.20      thorpej  1297: void
1.42      thorpej  1298: pool_sethardlimit(struct pool *pp, int n, const char *warnmess, int ratecap)
1.20      thorpej  1299: {
                   1300:
1.134     ad       1301:        mutex_enter(&pp->pr_lock);
1.20      thorpej  1302:
                   1303:        pp->pr_hardlimit = n;
                   1304:        pp->pr_hardlimit_warning = warnmess;
1.31      thorpej  1305:        pp->pr_hardlimit_ratecap.tv_sec = ratecap;
                   1306:        pp->pr_hardlimit_warning_last.tv_sec = 0;
                   1307:        pp->pr_hardlimit_warning_last.tv_usec = 0;
1.20      thorpej  1308:
                   1309:        /*
1.21      thorpej  1310:         * In-line version of pool_sethiwat(), because we don't want to
                   1311:         * release the lock.
1.20      thorpej  1312:         */
                   1313:        pp->pr_maxpages = (n == 0)
                   1314:                ? 0
                   1315:                : roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage;
1.21      thorpej  1316:
1.134     ad       1317:        mutex_exit(&pp->pr_lock);
1.20      thorpej  1318: }
1.3       pk       1319:
                   1320: /*
                   1321:  * Release all complete pages that have not been used recently.
1.184     rmind    1322:  *
1.197     jym      1323:  * Must not be called from interrupt context.
1.3       pk       1324:  */
1.66      thorpej  1325: int
1.56      sommerfe 1326: pool_reclaim(struct pool *pp)
1.3       pk       1327: {
                   1328:        struct pool_item_header *ph, *phnext;
1.61      chs      1329:        struct pool_pagelist pq;
1.151     yamt     1330:        uint32_t curtime;
1.134     ad       1331:        bool klock;
                   1332:        int rv;
1.3       pk       1333:
1.197     jym      1334:        KASSERT(!cpu_intr_p() && !cpu_softintr_p());
1.184     rmind    1335:
1.68      thorpej  1336:        if (pp->pr_drain_hook != NULL) {
                   1337:                /*
                   1338:                 * The drain hook must be called with the pool unlocked.
                   1339:                 */
                   1340:                (*pp->pr_drain_hook)(pp->pr_drain_hook_arg, PR_NOWAIT);
                   1341:        }
                   1342:
1.134     ad       1343:        /*
1.157     ad       1344:         * XXXSMP Because we do not want to cause non-MPSAFE code
                   1345:         * to block.
1.134     ad       1346:         */
                   1347:        if (pp->pr_ipl == IPL_SOFTNET || pp->pr_ipl == IPL_SOFTCLOCK ||
                   1348:            pp->pr_ipl == IPL_SOFTSERIAL) {
                   1349:                KERNEL_LOCK(1, NULL);
                   1350:                klock = true;
                   1351:        } else
                   1352:                klock = false;
                   1353:
                   1354:        /* Reclaim items from the pool's cache (if any). */
                   1355:        if (pp->pr_cache != NULL)
                   1356:                pool_cache_invalidate(pp->pr_cache);
                   1357:
                   1358:        if (mutex_tryenter(&pp->pr_lock) == 0) {
                   1359:                if (klock) {
                   1360:                        KERNEL_UNLOCK_ONE(NULL);
                   1361:                }
1.66      thorpej  1362:                return (0);
1.134     ad       1363:        }
1.68      thorpej  1364:
1.88      chs      1365:        LIST_INIT(&pq);
1.43      thorpej  1366:
1.151     yamt     1367:        curtime = time_uptime;
1.21      thorpej  1368:
1.88      chs      1369:        for (ph = LIST_FIRST(&pp->pr_emptypages); ph != NULL; ph = phnext) {
                   1370:                phnext = LIST_NEXT(ph, ph_pagelist);
1.3       pk       1371:
                   1372:                /* Check our minimum page claim */
                   1373:                if (pp->pr_npages <= pp->pr_minpages)
                   1374:                        break;
                   1375:
1.88      chs      1376:                KASSERT(ph->ph_nmissing == 0);
1.191     para     1377:                if (curtime - ph->ph_time < pool_inactive_time)
1.88      chs      1378:                        continue;
1.21      thorpej  1379:
1.88      chs      1380:                /*
                   1381:                 * If freeing this page would put us below
                   1382:                 * the low water mark, stop now.
                   1383:                 */
                   1384:                if ((pp->pr_nitems - pp->pr_itemsperpage) <
                   1385:                    pp->pr_minitems)
                   1386:                        break;
1.21      thorpej  1387:
1.88      chs      1388:                pr_rmpage(pp, ph, &pq);
1.3       pk       1389:        }
                   1390:
1.134     ad       1391:        mutex_exit(&pp->pr_lock);
                   1392:
                   1393:        if (LIST_EMPTY(&pq))
                   1394:                rv = 0;
                   1395:        else {
                   1396:                pr_pagelist_free(pp, &pq);
                   1397:                rv = 1;
                   1398:        }
                   1399:
                   1400:        if (klock) {
                   1401:                KERNEL_UNLOCK_ONE(NULL);
                   1402:        }
1.66      thorpej  1403:
1.134     ad       1404:        return (rv);
1.3       pk       1405: }
                   1406:
                   1407: /*
1.197     jym      1408:  * Drain pools, one at a time. The drained pool is returned within ppp.
1.131     ad       1409:  *
1.134     ad       1410:  * Note, must never be called from interrupt context.
1.3       pk       1411:  */
1.197     jym      1412: bool
                   1413: pool_drain(struct pool **ppp)
1.3       pk       1414: {
1.197     jym      1415:        bool reclaimed;
1.3       pk       1416:        struct pool *pp;
1.134     ad       1417:
1.145     ad       1418:        KASSERT(!TAILQ_EMPTY(&pool_head));
1.3       pk       1419:
1.61      chs      1420:        pp = NULL;
1.134     ad       1421:
                   1422:        /* Find next pool to drain, and add a reference. */
                   1423:        mutex_enter(&pool_head_lock);
                   1424:        do {
                   1425:                if (drainpp == NULL) {
1.145     ad       1426:                        drainpp = TAILQ_FIRST(&pool_head);
1.134     ad       1427:                }
                   1428:                if (drainpp != NULL) {
                   1429:                        pp = drainpp;
1.145     ad       1430:                        drainpp = TAILQ_NEXT(pp, pr_poollist);
1.134     ad       1431:                }
                   1432:                /*
                   1433:                 * Skip completely idle pools.  We depend on at least
                   1434:                 * one pool in the system being active.
                   1435:                 */
                   1436:        } while (pp == NULL || pp->pr_npages == 0);
                   1437:        pp->pr_refcnt++;
                   1438:        mutex_exit(&pool_head_lock);
                   1439:
                   1440:        /* Drain the cache (if any) and pool.. */
1.186     pooka    1441:        reclaimed = pool_reclaim(pp);
1.134     ad       1442:
                   1443:        /* Finally, unlock the pool. */
                   1444:        mutex_enter(&pool_head_lock);
                   1445:        pp->pr_refcnt--;
                   1446:        cv_broadcast(&pool_busy);
                   1447:        mutex_exit(&pool_head_lock);
1.186     pooka    1448:
1.197     jym      1449:        if (ppp != NULL)
                   1450:                *ppp = pp;
                   1451:
1.186     pooka    1452:        return reclaimed;
1.3       pk       1453: }
                   1454:
                   1455: /*
1.217     mrg      1456:  * Calculate the total number of pages consumed by pools.
                   1457:  */
                   1458: int
                   1459: pool_totalpages(void)
                   1460: {
                   1461:        struct pool *pp;
1.218   ! mrg      1462:        uint64_t total = 0;
1.217     mrg      1463:
                   1464:        mutex_enter(&pool_head_lock);
1.218   ! mrg      1465:        TAILQ_FOREACH(pp, &pool_head, pr_poollist) {
        !          1466:                uint64_t bytes = pp->pr_npages * pp->pr_alloc->pa_pagesz;
        !          1467:
        !          1468:                if ((pp->pr_roflags & PR_RECURSIVE) != 0)
        !          1469:                        bytes -= (pp->pr_nout * pp->pr_size);
        !          1470:                total += bytes;
        !          1471:        }
1.217     mrg      1472:        mutex_exit(&pool_head_lock);
                   1473:
1.218   ! mrg      1474:        return atop(total);
1.217     mrg      1475: }
                   1476:
                   1477: /*
1.3       pk       1478:  * Diagnostic helpers.
                   1479:  */
1.21      thorpej  1480:
1.25      thorpej  1481: void
1.108     yamt     1482: pool_printall(const char *modif, void (*pr)(const char *, ...))
                   1483: {
                   1484:        struct pool *pp;
                   1485:
1.145     ad       1486:        TAILQ_FOREACH(pp, &pool_head, pr_poollist) {
1.108     yamt     1487:                pool_printit(pp, modif, pr);
                   1488:        }
                   1489: }
                   1490:
                   1491: void
1.42      thorpej  1492: pool_printit(struct pool *pp, const char *modif, void (*pr)(const char *, ...))
1.25      thorpej  1493: {
                   1494:
                   1495:        if (pp == NULL) {
                   1496:                (*pr)("Must specify a pool to print.\n");
                   1497:                return;
                   1498:        }
                   1499:
                   1500:        pool_print1(pp, modif, pr);
                   1501: }
                   1502:
1.21      thorpej  1503: static void
1.124     yamt     1504: pool_print_pagelist(struct pool *pp, struct pool_pagelist *pl,
1.97      yamt     1505:     void (*pr)(const char *, ...))
1.88      chs      1506: {
                   1507:        struct pool_item_header *ph;
1.207     riastrad 1508:        struct pool_item *pi __diagused;
1.88      chs      1509:
                   1510:        LIST_FOREACH(ph, pl, ph_pagelist) {
1.151     yamt     1511:                (*pr)("\t\tpage %p, nmissing %d, time %" PRIu32 "\n",
                   1512:                    ph->ph_page, ph->ph_nmissing, ph->ph_time);
1.88      chs      1513: #ifdef DIAGNOSTIC
1.97      yamt     1514:                if (!(pp->pr_roflags & PR_NOTOUCH)) {
1.102     chs      1515:                        LIST_FOREACH(pi, &ph->ph_itemlist, pi_list) {
1.97      yamt     1516:                                if (pi->pi_magic != PI_MAGIC) {
                   1517:                                        (*pr)("\t\t\titem %p, magic 0x%x\n",
                   1518:                                            pi, pi->pi_magic);
                   1519:                                }
1.88      chs      1520:                        }
                   1521:                }
                   1522: #endif
                   1523:        }
                   1524: }
                   1525:
                   1526: static void
1.42      thorpej  1527: pool_print1(struct pool *pp, const char *modif, void (*pr)(const char *, ...))
1.3       pk       1528: {
1.25      thorpej  1529:        struct pool_item_header *ph;
1.134     ad       1530:        pool_cache_t pc;
                   1531:        pcg_t *pcg;
                   1532:        pool_cache_cpu_t *cc;
                   1533:        uint64_t cpuhit, cpumiss;
1.44      thorpej  1534:        int i, print_log = 0, print_pagelist = 0, print_cache = 0;
1.25      thorpej  1535:        char c;
                   1536:
                   1537:        while ((c = *modif++) != '\0') {
                   1538:                if (c == 'l')
                   1539:                        print_log = 1;
                   1540:                if (c == 'p')
                   1541:                        print_pagelist = 1;
1.44      thorpej  1542:                if (c == 'c')
                   1543:                        print_cache = 1;
1.25      thorpej  1544:        }
                   1545:
1.134     ad       1546:        if ((pc = pp->pr_cache) != NULL) {
                   1547:                (*pr)("POOL CACHE");
                   1548:        } else {
                   1549:                (*pr)("POOL");
                   1550:        }
                   1551:
                   1552:        (*pr)(" %s: size %u, align %u, ioff %u, roflags 0x%08x\n",
1.25      thorpej  1553:            pp->pr_wchan, pp->pr_size, pp->pr_align, pp->pr_itemoffset,
                   1554:            pp->pr_roflags);
1.66      thorpej  1555:        (*pr)("\talloc %p\n", pp->pr_alloc);
1.25      thorpej  1556:        (*pr)("\tminitems %u, minpages %u, maxpages %u, npages %u\n",
                   1557:            pp->pr_minitems, pp->pr_minpages, pp->pr_maxpages, pp->pr_npages);
                   1558:        (*pr)("\titemsperpage %u, nitems %u, nout %u, hardlimit %u\n",
                   1559:            pp->pr_itemsperpage, pp->pr_nitems, pp->pr_nout, pp->pr_hardlimit);
                   1560:
1.134     ad       1561:        (*pr)("\tnget %lu, nfail %lu, nput %lu\n",
1.25      thorpej  1562:            pp->pr_nget, pp->pr_nfail, pp->pr_nput);
                   1563:        (*pr)("\tnpagealloc %lu, npagefree %lu, hiwat %u, nidle %lu\n",
                   1564:            pp->pr_npagealloc, pp->pr_npagefree, pp->pr_hiwat, pp->pr_nidle);
                   1565:
                   1566:        if (print_pagelist == 0)
                   1567:                goto skip_pagelist;
                   1568:
1.88      chs      1569:        if ((ph = LIST_FIRST(&pp->pr_emptypages)) != NULL)
                   1570:                (*pr)("\n\tempty page list:\n");
1.97      yamt     1571:        pool_print_pagelist(pp, &pp->pr_emptypages, pr);
1.88      chs      1572:        if ((ph = LIST_FIRST(&pp->pr_fullpages)) != NULL)
                   1573:                (*pr)("\n\tfull page list:\n");
1.97      yamt     1574:        pool_print_pagelist(pp, &pp->pr_fullpages, pr);
1.88      chs      1575:        if ((ph = LIST_FIRST(&pp->pr_partpages)) != NULL)
                   1576:                (*pr)("\n\tpartial-page list:\n");
1.97      yamt     1577:        pool_print_pagelist(pp, &pp->pr_partpages, pr);
1.88      chs      1578:
1.25      thorpej  1579:        if (pp->pr_curpage == NULL)
                   1580:                (*pr)("\tno current page\n");
                   1581:        else
                   1582:                (*pr)("\tcurpage %p\n", pp->pr_curpage->ph_page);
                   1583:
                   1584:  skip_pagelist:
                   1585:        if (print_log == 0)
                   1586:                goto skip_log;
                   1587:
                   1588:        (*pr)("\n");
1.3       pk       1589:
1.25      thorpej  1590:  skip_log:
1.44      thorpej  1591:
1.102     chs      1592: #define PR_GROUPLIST(pcg)                                              \
                   1593:        (*pr)("\t\tgroup %p: avail %d\n", pcg, pcg->pcg_avail);         \
1.142     ad       1594:        for (i = 0; i < pcg->pcg_size; i++) {                           \
1.102     chs      1595:                if (pcg->pcg_objects[i].pcgo_pa !=                      \
                   1596:                    POOL_PADDR_INVALID) {                               \
                   1597:                        (*pr)("\t\t\t%p, 0x%llx\n",                     \
                   1598:                            pcg->pcg_objects[i].pcgo_va,                \
                   1599:                            (unsigned long long)                        \
                   1600:                            pcg->pcg_objects[i].pcgo_pa);               \
                   1601:                } else {                                                \
                   1602:                        (*pr)("\t\t\t%p\n",                             \
                   1603:                            pcg->pcg_objects[i].pcgo_va);               \
                   1604:                }                                                       \
                   1605:        }
                   1606:
1.134     ad       1607:        if (pc != NULL) {
                   1608:                cpuhit = 0;
                   1609:                cpumiss = 0;
1.183     ad       1610:                for (i = 0; i < __arraycount(pc->pc_cpus); i++) {
1.134     ad       1611:                        if ((cc = pc->pc_cpus[i]) == NULL)
                   1612:                                continue;
                   1613:                        cpuhit += cc->cc_hits;
                   1614:                        cpumiss += cc->cc_misses;
                   1615:                }
                   1616:                (*pr)("\tcpu layer hits %llu misses %llu\n", cpuhit, cpumiss);
                   1617:                (*pr)("\tcache layer hits %llu misses %llu\n",
                   1618:                    pc->pc_hits, pc->pc_misses);
                   1619:                (*pr)("\tcache layer entry uncontended %llu contended %llu\n",
                   1620:                    pc->pc_hits + pc->pc_misses - pc->pc_contended,
                   1621:                    pc->pc_contended);
                   1622:                (*pr)("\tcache layer empty groups %u full groups %u\n",
                   1623:                    pc->pc_nempty, pc->pc_nfull);
                   1624:                if (print_cache) {
                   1625:                        (*pr)("\tfull cache groups:\n");
                   1626:                        for (pcg = pc->pc_fullgroups; pcg != NULL;
                   1627:                            pcg = pcg->pcg_next) {
                   1628:                                PR_GROUPLIST(pcg);
                   1629:                        }
                   1630:                        (*pr)("\tempty cache groups:\n");
                   1631:                        for (pcg = pc->pc_emptygroups; pcg != NULL;
                   1632:                            pcg = pcg->pcg_next) {
                   1633:                                PR_GROUPLIST(pcg);
                   1634:                        }
1.103     chs      1635:                }
1.44      thorpej  1636:        }
1.102     chs      1637: #undef PR_GROUPLIST
1.88      chs      1638: }
                   1639:
                   1640: static int
                   1641: pool_chk_page(struct pool *pp, const char *label, struct pool_item_header *ph)
                   1642: {
                   1643:        struct pool_item *pi;
1.128     christos 1644:        void *page;
1.88      chs      1645:        int n;
                   1646:
1.121     yamt     1647:        if ((pp->pr_roflags & PR_NOALIGN) == 0) {
1.128     christos 1648:                page = (void *)((uintptr_t)ph & pp->pr_alloc->pa_pagemask);
1.121     yamt     1649:                if (page != ph->ph_page &&
                   1650:                    (pp->pr_roflags & PR_PHINPAGE) != 0) {
                   1651:                        if (label != NULL)
                   1652:                                printf("%s: ", label);
                   1653:                        printf("pool(%p:%s): page inconsistency: page %p;"
                   1654:                               " at page head addr %p (p %p)\n", pp,
                   1655:                                pp->pr_wchan, ph->ph_page,
                   1656:                                ph, page);
                   1657:                        return 1;
                   1658:                }
1.88      chs      1659:        }
1.3       pk       1660:
1.97      yamt     1661:        if ((pp->pr_roflags & PR_NOTOUCH) != 0)
                   1662:                return 0;
                   1663:
1.102     chs      1664:        for (pi = LIST_FIRST(&ph->ph_itemlist), n = 0;
1.88      chs      1665:             pi != NULL;
1.102     chs      1666:             pi = LIST_NEXT(pi,pi_list), n++) {
1.88      chs      1667:
                   1668: #ifdef DIAGNOSTIC
                   1669:                if (pi->pi_magic != PI_MAGIC) {
                   1670:                        if (label != NULL)
                   1671:                                printf("%s: ", label);
                   1672:                        printf("pool(%s): free list modified: magic=%x;"
1.121     yamt     1673:                               " page %p; item ordinal %d; addr %p\n",
1.88      chs      1674:                                pp->pr_wchan, pi->pi_magic, ph->ph_page,
1.121     yamt     1675:                                n, pi);
1.88      chs      1676:                        panic("pool");
                   1677:                }
                   1678: #endif
1.121     yamt     1679:                if ((pp->pr_roflags & PR_NOALIGN) != 0) {
                   1680:                        continue;
                   1681:                }
1.128     christos 1682:                page = (void *)((uintptr_t)pi & pp->pr_alloc->pa_pagemask);
1.88      chs      1683:                if (page == ph->ph_page)
                   1684:                        continue;
                   1685:
                   1686:                if (label != NULL)
                   1687:                        printf("%s: ", label);
                   1688:                printf("pool(%p:%s): page inconsistency: page %p;"
                   1689:                       " item ordinal %d; addr %p (p %p)\n", pp,
                   1690:                        pp->pr_wchan, ph->ph_page,
                   1691:                        n, pi, page);
                   1692:                return 1;
                   1693:        }
                   1694:        return 0;
1.3       pk       1695: }
                   1696:
1.88      chs      1697:
1.3       pk       1698: int
1.42      thorpej  1699: pool_chk(struct pool *pp, const char *label)
1.3       pk       1700: {
                   1701:        struct pool_item_header *ph;
                   1702:        int r = 0;
                   1703:
1.134     ad       1704:        mutex_enter(&pp->pr_lock);
1.88      chs      1705:        LIST_FOREACH(ph, &pp->pr_emptypages, ph_pagelist) {
                   1706:                r = pool_chk_page(pp, label, ph);
                   1707:                if (r) {
                   1708:                        goto out;
                   1709:                }
                   1710:        }
                   1711:        LIST_FOREACH(ph, &pp->pr_fullpages, ph_pagelist) {
                   1712:                r = pool_chk_page(pp, label, ph);
                   1713:                if (r) {
1.3       pk       1714:                        goto out;
                   1715:                }
1.88      chs      1716:        }
                   1717:        LIST_FOREACH(ph, &pp->pr_partpages, ph_pagelist) {
                   1718:                r = pool_chk_page(pp, label, ph);
                   1719:                if (r) {
1.3       pk       1720:                        goto out;
                   1721:                }
                   1722:        }
1.88      chs      1723:
1.3       pk       1724: out:
1.134     ad       1725:        mutex_exit(&pp->pr_lock);
1.3       pk       1726:        return (r);
1.43      thorpej  1727: }
                   1728:
                   1729: /*
                   1730:  * pool_cache_init:
                   1731:  *
                   1732:  *     Initialize a pool cache.
1.134     ad       1733:  */
                   1734: pool_cache_t
                   1735: pool_cache_init(size_t size, u_int align, u_int align_offset, u_int flags,
                   1736:     const char *wchan, struct pool_allocator *palloc, int ipl,
                   1737:     int (*ctor)(void *, void *, int), void (*dtor)(void *, void *), void *arg)
                   1738: {
                   1739:        pool_cache_t pc;
                   1740:
                   1741:        pc = pool_get(&cache_pool, PR_WAITOK);
                   1742:        if (pc == NULL)
                   1743:                return NULL;
                   1744:
                   1745:        pool_cache_bootstrap(pc, size, align, align_offset, flags, wchan,
                   1746:           palloc, ipl, ctor, dtor, arg);
                   1747:
                   1748:        return pc;
                   1749: }
                   1750:
                   1751: /*
                   1752:  * pool_cache_bootstrap:
1.43      thorpej  1753:  *
1.134     ad       1754:  *     Kernel-private version of pool_cache_init().  The caller
                   1755:  *     provides initial storage.
1.43      thorpej  1756:  */
                   1757: void
1.134     ad       1758: pool_cache_bootstrap(pool_cache_t pc, size_t size, u_int align,
                   1759:     u_int align_offset, u_int flags, const char *wchan,
                   1760:     struct pool_allocator *palloc, int ipl,
                   1761:     int (*ctor)(void *, void *, int), void (*dtor)(void *, void *),
1.43      thorpej  1762:     void *arg)
                   1763: {
1.134     ad       1764:        CPU_INFO_ITERATOR cii;
1.145     ad       1765:        pool_cache_t pc1;
1.134     ad       1766:        struct cpu_info *ci;
                   1767:        struct pool *pp;
                   1768:
                   1769:        pp = &pc->pc_pool;
1.208     chs      1770:        if (palloc == NULL && ipl == IPL_NONE) {
                   1771:                if (size > PAGE_SIZE) {
                   1772:                        int bigidx = pool_bigidx(size);
                   1773:
                   1774:                        palloc = &pool_allocator_big[bigidx];
                   1775:                } else
                   1776:                        palloc = &pool_allocator_nointr;
                   1777:        }
1.134     ad       1778:        pool_init(pp, size, align, align_offset, flags, wchan, palloc, ipl);
1.157     ad       1779:        mutex_init(&pc->pc_lock, MUTEX_DEFAULT, ipl);
1.43      thorpej  1780:
1.134     ad       1781:        if (ctor == NULL) {
                   1782:                ctor = (int (*)(void *, void *, int))nullop;
                   1783:        }
                   1784:        if (dtor == NULL) {
                   1785:                dtor = (void (*)(void *, void *))nullop;
                   1786:        }
1.43      thorpej  1787:
1.134     ad       1788:        pc->pc_emptygroups = NULL;
                   1789:        pc->pc_fullgroups = NULL;
                   1790:        pc->pc_partgroups = NULL;
1.43      thorpej  1791:        pc->pc_ctor = ctor;
                   1792:        pc->pc_dtor = dtor;
                   1793:        pc->pc_arg  = arg;
1.134     ad       1794:        pc->pc_hits  = 0;
1.48      thorpej  1795:        pc->pc_misses = 0;
1.134     ad       1796:        pc->pc_nempty = 0;
                   1797:        pc->pc_npart = 0;
                   1798:        pc->pc_nfull = 0;
                   1799:        pc->pc_contended = 0;
                   1800:        pc->pc_refcnt = 0;
1.136     yamt     1801:        pc->pc_freecheck = NULL;
1.134     ad       1802:
1.142     ad       1803:        if ((flags & PR_LARGECACHE) != 0) {
                   1804:                pc->pc_pcgsize = PCG_NOBJECTS_LARGE;
1.163     ad       1805:                pc->pc_pcgpool = &pcg_large_pool;
1.142     ad       1806:        } else {
                   1807:                pc->pc_pcgsize = PCG_NOBJECTS_NORMAL;
1.163     ad       1808:                pc->pc_pcgpool = &pcg_normal_pool;
1.142     ad       1809:        }
                   1810:
1.134     ad       1811:        /* Allocate per-CPU caches. */
                   1812:        memset(pc->pc_cpus, 0, sizeof(pc->pc_cpus));
                   1813:        pc->pc_ncpu = 0;
1.139     ad       1814:        if (ncpu < 2) {
1.137     ad       1815:                /* XXX For sparc: boot CPU is not attached yet. */
                   1816:                pool_cache_cpu_init1(curcpu(), pc);
                   1817:        } else {
                   1818:                for (CPU_INFO_FOREACH(cii, ci)) {
                   1819:                        pool_cache_cpu_init1(ci, pc);
                   1820:                }
1.134     ad       1821:        }
1.145     ad       1822:
                   1823:        /* Add to list of all pools. */
                   1824:        if (__predict_true(!cold))
1.134     ad       1825:                mutex_enter(&pool_head_lock);
1.145     ad       1826:        TAILQ_FOREACH(pc1, &pool_cache_head, pc_cachelist) {
                   1827:                if (strcmp(pc1->pc_pool.pr_wchan, pc->pc_pool.pr_wchan) > 0)
                   1828:                        break;
                   1829:        }
                   1830:        if (pc1 == NULL)
                   1831:                TAILQ_INSERT_TAIL(&pool_cache_head, pc, pc_cachelist);
                   1832:        else
                   1833:                TAILQ_INSERT_BEFORE(pc1, pc, pc_cachelist);
                   1834:        if (__predict_true(!cold))
1.134     ad       1835:                mutex_exit(&pool_head_lock);
1.145     ad       1836:
                   1837:        membar_sync();
                   1838:        pp->pr_cache = pc;
1.43      thorpej  1839: }
                   1840:
                   1841: /*
                   1842:  * pool_cache_destroy:
                   1843:  *
                   1844:  *     Destroy a pool cache.
                   1845:  */
                   1846: void
1.134     ad       1847: pool_cache_destroy(pool_cache_t pc)
1.43      thorpej  1848: {
1.191     para     1849:
                   1850:        pool_cache_bootstrap_destroy(pc);
                   1851:        pool_put(&cache_pool, pc);
                   1852: }
                   1853:
                   1854: /*
                   1855:  * pool_cache_bootstrap_destroy:
                   1856:  *
                   1857:  *     Destroy a pool cache.
                   1858:  */
                   1859: void
                   1860: pool_cache_bootstrap_destroy(pool_cache_t pc)
                   1861: {
1.134     ad       1862:        struct pool *pp = &pc->pc_pool;
1.175     jym      1863:        u_int i;
1.134     ad       1864:
                   1865:        /* Remove it from the global list. */
                   1866:        mutex_enter(&pool_head_lock);
                   1867:        while (pc->pc_refcnt != 0)
                   1868:                cv_wait(&pool_busy, &pool_head_lock);
1.145     ad       1869:        TAILQ_REMOVE(&pool_cache_head, pc, pc_cachelist);
1.134     ad       1870:        mutex_exit(&pool_head_lock);
1.43      thorpej  1871:
                   1872:        /* First, invalidate the entire cache. */
                   1873:        pool_cache_invalidate(pc);
                   1874:
1.134     ad       1875:        /* Disassociate it from the pool. */
                   1876:        mutex_enter(&pp->pr_lock);
                   1877:        pp->pr_cache = NULL;
                   1878:        mutex_exit(&pp->pr_lock);
                   1879:
                   1880:        /* Destroy per-CPU data */
1.183     ad       1881:        for (i = 0; i < __arraycount(pc->pc_cpus); i++)
1.175     jym      1882:                pool_cache_invalidate_cpu(pc, i);
1.134     ad       1883:
                   1884:        /* Finally, destroy it. */
                   1885:        mutex_destroy(&pc->pc_lock);
                   1886:        pool_destroy(pp);
                   1887: }
                   1888:
                   1889: /*
                   1890:  * pool_cache_cpu_init1:
                   1891:  *
                   1892:  *     Called for each pool_cache whenever a new CPU is attached.
                   1893:  */
                   1894: static void
                   1895: pool_cache_cpu_init1(struct cpu_info *ci, pool_cache_t pc)
                   1896: {
                   1897:        pool_cache_cpu_t *cc;
1.137     ad       1898:        int index;
1.134     ad       1899:
1.137     ad       1900:        index = ci->ci_index;
                   1901:
1.183     ad       1902:        KASSERT(index < __arraycount(pc->pc_cpus));
1.134     ad       1903:
1.137     ad       1904:        if ((cc = pc->pc_cpus[index]) != NULL) {
                   1905:                KASSERT(cc->cc_cpuindex == index);
1.134     ad       1906:                return;
                   1907:        }
                   1908:
                   1909:        /*
                   1910:         * The first CPU is 'free'.  This needs to be the case for
                   1911:         * bootstrap - we may not be able to allocate yet.
                   1912:         */
                   1913:        if (pc->pc_ncpu == 0) {
                   1914:                cc = &pc->pc_cpu0;
                   1915:                pc->pc_ncpu = 1;
                   1916:        } else {
                   1917:                mutex_enter(&pc->pc_lock);
                   1918:                pc->pc_ncpu++;
                   1919:                mutex_exit(&pc->pc_lock);
                   1920:                cc = pool_get(&cache_cpu_pool, PR_WAITOK);
                   1921:        }
                   1922:
                   1923:        cc->cc_ipl = pc->pc_pool.pr_ipl;
                   1924:        cc->cc_iplcookie = makeiplcookie(cc->cc_ipl);
                   1925:        cc->cc_cache = pc;
1.137     ad       1926:        cc->cc_cpuindex = index;
1.134     ad       1927:        cc->cc_hits = 0;
                   1928:        cc->cc_misses = 0;
1.169     yamt     1929:        cc->cc_current = __UNCONST(&pcg_dummy);
                   1930:        cc->cc_previous = __UNCONST(&pcg_dummy);
1.134     ad       1931:
1.137     ad       1932:        pc->pc_cpus[index] = cc;
1.43      thorpej  1933: }
                   1934:
1.134     ad       1935: /*
                   1936:  * pool_cache_cpu_init:
                   1937:  *
                   1938:  *     Called whenever a new CPU is attached.
                   1939:  */
                   1940: void
                   1941: pool_cache_cpu_init(struct cpu_info *ci)
1.43      thorpej  1942: {
1.134     ad       1943:        pool_cache_t pc;
                   1944:
                   1945:        mutex_enter(&pool_head_lock);
1.145     ad       1946:        TAILQ_FOREACH(pc, &pool_cache_head, pc_cachelist) {
1.134     ad       1947:                pc->pc_refcnt++;
                   1948:                mutex_exit(&pool_head_lock);
1.43      thorpej  1949:
1.134     ad       1950:                pool_cache_cpu_init1(ci, pc);
1.43      thorpej  1951:
1.134     ad       1952:                mutex_enter(&pool_head_lock);
                   1953:                pc->pc_refcnt--;
                   1954:                cv_broadcast(&pool_busy);
                   1955:        }
                   1956:        mutex_exit(&pool_head_lock);
1.43      thorpej  1957: }
                   1958:
1.134     ad       1959: /*
                   1960:  * pool_cache_reclaim:
                   1961:  *
                   1962:  *     Reclaim memory from a pool cache.
                   1963:  */
                   1964: bool
                   1965: pool_cache_reclaim(pool_cache_t pc)
1.43      thorpej  1966: {
                   1967:
1.134     ad       1968:        return pool_reclaim(&pc->pc_pool);
                   1969: }
1.43      thorpej  1970:
1.136     yamt     1971: static void
                   1972: pool_cache_destruct_object1(pool_cache_t pc, void *object)
                   1973: {
                   1974:
                   1975:        (*pc->pc_dtor)(pc->pc_arg, object);
                   1976:        pool_put(&pc->pc_pool, object);
                   1977: }
                   1978:
1.134     ad       1979: /*
                   1980:  * pool_cache_destruct_object:
                   1981:  *
                   1982:  *     Force destruction of an object and its release back into
                   1983:  *     the pool.
                   1984:  */
                   1985: void
                   1986: pool_cache_destruct_object(pool_cache_t pc, void *object)
                   1987: {
                   1988:
1.136     yamt     1989:        FREECHECK_IN(&pc->pc_freecheck, object);
                   1990:
                   1991:        pool_cache_destruct_object1(pc, object);
1.43      thorpej  1992: }
                   1993:
1.134     ad       1994: /*
                   1995:  * pool_cache_invalidate_groups:
                   1996:  *
                   1997:  *     Invalidate a chain of groups and destruct all objects.
                   1998:  */
1.102     chs      1999: static void
1.134     ad       2000: pool_cache_invalidate_groups(pool_cache_t pc, pcg_t *pcg)
1.102     chs      2001: {
1.134     ad       2002:        void *object;
                   2003:        pcg_t *next;
                   2004:        int i;
                   2005:
                   2006:        for (; pcg != NULL; pcg = next) {
                   2007:                next = pcg->pcg_next;
                   2008:
                   2009:                for (i = 0; i < pcg->pcg_avail; i++) {
                   2010:                        object = pcg->pcg_objects[i].pcgo_va;
1.136     yamt     2011:                        pool_cache_destruct_object1(pc, object);
1.134     ad       2012:                }
1.102     chs      2013:
1.142     ad       2014:                if (pcg->pcg_size == PCG_NOBJECTS_LARGE) {
                   2015:                        pool_put(&pcg_large_pool, pcg);
                   2016:                } else {
                   2017:                        KASSERT(pcg->pcg_size == PCG_NOBJECTS_NORMAL);
                   2018:                        pool_put(&pcg_normal_pool, pcg);
                   2019:                }
1.102     chs      2020:        }
                   2021: }
                   2022:
1.43      thorpej  2023: /*
1.134     ad       2024:  * pool_cache_invalidate:
1.43      thorpej  2025:  *
1.134     ad       2026:  *     Invalidate a pool cache (destruct and release all of the
                   2027:  *     cached objects).  Does not reclaim objects from the pool.
1.176     thorpej  2028:  *
                   2029:  *     Note: For pool caches that provide constructed objects, there
                   2030:  *     is an assumption that another level of synchronization is occurring
                   2031:  *     between the input to the constructor and the cache invalidation.
1.196     jym      2032:  *
                   2033:  *     Invalidation is a costly process and should not be called from
                   2034:  *     interrupt context.
1.43      thorpej  2035:  */
1.134     ad       2036: void
                   2037: pool_cache_invalidate(pool_cache_t pc)
                   2038: {
1.196     jym      2039:        uint64_t where;
1.134     ad       2040:        pcg_t *full, *empty, *part;
1.196     jym      2041:
                   2042:        KASSERT(!cpu_intr_p() && !cpu_softintr_p());
1.176     thorpej  2043:
1.177     jym      2044:        if (ncpu < 2 || !mp_online) {
1.176     thorpej  2045:                /*
                   2046:                 * We might be called early enough in the boot process
                   2047:                 * for the CPU data structures to not be fully initialized.
1.196     jym      2048:                 * In this case, transfer the content of the local CPU's
                   2049:                 * cache back into global cache as only this CPU is currently
                   2050:                 * running.
1.176     thorpej  2051:                 */
1.196     jym      2052:                pool_cache_transfer(pc);
1.176     thorpej  2053:        } else {
                   2054:                /*
1.196     jym      2055:                 * Signal all CPUs that they must transfer their local
                   2056:                 * cache back to the global pool then wait for the xcall to
                   2057:                 * complete.
1.176     thorpej  2058:                 */
1.196     jym      2059:                where = xc_broadcast(0, (xcfunc_t)pool_cache_transfer,
                   2060:                    pc, NULL);
1.176     thorpej  2061:                xc_wait(where);
                   2062:        }
1.196     jym      2063:
                   2064:        /* Empty pool caches, then invalidate objects */
1.134     ad       2065:        mutex_enter(&pc->pc_lock);
                   2066:        full = pc->pc_fullgroups;
                   2067:        empty = pc->pc_emptygroups;
                   2068:        part = pc->pc_partgroups;
                   2069:        pc->pc_fullgroups = NULL;
                   2070:        pc->pc_emptygroups = NULL;
                   2071:        pc->pc_partgroups = NULL;
                   2072:        pc->pc_nfull = 0;
                   2073:        pc->pc_nempty = 0;
                   2074:        pc->pc_npart = 0;
                   2075:        mutex_exit(&pc->pc_lock);
                   2076:
                   2077:        pool_cache_invalidate_groups(pc, full);
                   2078:        pool_cache_invalidate_groups(pc, empty);
                   2079:        pool_cache_invalidate_groups(pc, part);
                   2080: }
                   2081:
1.175     jym      2082: /*
                   2083:  * pool_cache_invalidate_cpu:
                   2084:  *
                   2085:  *     Invalidate all CPU-bound cached objects in pool cache, the CPU being
                   2086:  *     identified by its associated index.
                   2087:  *     It is caller's responsibility to ensure that no operation is
                   2088:  *     taking place on this pool cache while doing this invalidation.
                   2089:  *     WARNING: as no inter-CPU locking is enforced, trying to invalidate
                   2090:  *     pool cached objects from a CPU different from the one currently running
                   2091:  *     may result in an undefined behaviour.
                   2092:  */
                   2093: static void
                   2094: pool_cache_invalidate_cpu(pool_cache_t pc, u_int index)
                   2095: {
                   2096:        pool_cache_cpu_t *cc;
                   2097:        pcg_t *pcg;
                   2098:
                   2099:        if ((cc = pc->pc_cpus[index]) == NULL)
                   2100:                return;
                   2101:
                   2102:        if ((pcg = cc->cc_current) != &pcg_dummy) {
                   2103:                pcg->pcg_next = NULL;
                   2104:                pool_cache_invalidate_groups(pc, pcg);
                   2105:        }
                   2106:        if ((pcg = cc->cc_previous) != &pcg_dummy) {
                   2107:                pcg->pcg_next = NULL;
                   2108:                pool_cache_invalidate_groups(pc, pcg);
                   2109:        }
                   2110:        if (cc != &pc->pc_cpu0)
                   2111:                pool_put(&cache_cpu_pool, cc);
                   2112:
                   2113: }
                   2114:
1.134     ad       2115: void
                   2116: pool_cache_set_drain_hook(pool_cache_t pc, void (*fn)(void *, int), void *arg)
                   2117: {
                   2118:
                   2119:        pool_set_drain_hook(&pc->pc_pool, fn, arg);
                   2120: }
                   2121:
                   2122: void
                   2123: pool_cache_setlowat(pool_cache_t pc, int n)
                   2124: {
                   2125:
                   2126:        pool_setlowat(&pc->pc_pool, n);
                   2127: }
                   2128:
                   2129: void
                   2130: pool_cache_sethiwat(pool_cache_t pc, int n)
                   2131: {
                   2132:
                   2133:        pool_sethiwat(&pc->pc_pool, n);
                   2134: }
                   2135:
                   2136: void
                   2137: pool_cache_sethardlimit(pool_cache_t pc, int n, const char *warnmess, int ratecap)
                   2138: {
                   2139:
                   2140:        pool_sethardlimit(&pc->pc_pool, n, warnmess, ratecap);
                   2141: }
                   2142:
1.162     ad       2143: static bool __noinline
                   2144: pool_cache_get_slow(pool_cache_cpu_t *cc, int s, void **objectp,
1.134     ad       2145:                    paddr_t *pap, int flags)
1.43      thorpej  2146: {
1.134     ad       2147:        pcg_t *pcg, *cur;
                   2148:        uint64_t ncsw;
                   2149:        pool_cache_t pc;
1.43      thorpej  2150:        void *object;
1.58      thorpej  2151:
1.168     yamt     2152:        KASSERT(cc->cc_current->pcg_avail == 0);
                   2153:        KASSERT(cc->cc_previous->pcg_avail == 0);
                   2154:
1.134     ad       2155:        pc = cc->cc_cache;
                   2156:        cc->cc_misses++;
1.43      thorpej  2157:
1.134     ad       2158:        /*
                   2159:         * Nothing was available locally.  Try and grab a group
                   2160:         * from the cache.
                   2161:         */
1.162     ad       2162:        if (__predict_false(!mutex_tryenter(&pc->pc_lock))) {
1.134     ad       2163:                ncsw = curlwp->l_ncsw;
                   2164:                mutex_enter(&pc->pc_lock);
                   2165:                pc->pc_contended++;
1.43      thorpej  2166:
1.134     ad       2167:                /*
                   2168:                 * If we context switched while locking, then
                   2169:                 * our view of the per-CPU data is invalid:
                   2170:                 * retry.
                   2171:                 */
                   2172:                if (curlwp->l_ncsw != ncsw) {
                   2173:                        mutex_exit(&pc->pc_lock);
1.162     ad       2174:                        return true;
1.43      thorpej  2175:                }
1.102     chs      2176:        }
1.43      thorpej  2177:
1.162     ad       2178:        if (__predict_true((pcg = pc->pc_fullgroups) != NULL)) {
1.43      thorpej  2179:                /*
1.134     ad       2180:                 * If there's a full group, release our empty
                   2181:                 * group back to the cache.  Install the full
                   2182:                 * group as cc_current and return.
1.43      thorpej  2183:                 */
1.162     ad       2184:                if (__predict_true((cur = cc->cc_current) != &pcg_dummy)) {
1.134     ad       2185:                        KASSERT(cur->pcg_avail == 0);
                   2186:                        cur->pcg_next = pc->pc_emptygroups;
                   2187:                        pc->pc_emptygroups = cur;
                   2188:                        pc->pc_nempty++;
1.87      thorpej  2189:                }
1.142     ad       2190:                KASSERT(pcg->pcg_avail == pcg->pcg_size);
1.134     ad       2191:                cc->cc_current = pcg;
                   2192:                pc->pc_fullgroups = pcg->pcg_next;
                   2193:                pc->pc_hits++;
                   2194:                pc->pc_nfull--;
                   2195:                mutex_exit(&pc->pc_lock);
1.162     ad       2196:                return true;
1.134     ad       2197:        }
                   2198:
                   2199:        /*
                   2200:         * Nothing available locally or in cache.  Take the slow
                   2201:         * path: fetch a new object from the pool and construct
                   2202:         * it.
                   2203:         */
                   2204:        pc->pc_misses++;
                   2205:        mutex_exit(&pc->pc_lock);
1.162     ad       2206:        splx(s);
1.134     ad       2207:
                   2208:        object = pool_get(&pc->pc_pool, flags);
                   2209:        *objectp = object;
1.211     riastrad 2210:        if (__predict_false(object == NULL)) {
                   2211:                KASSERT((flags & (PR_WAITOK|PR_NOWAIT)) == PR_NOWAIT);
1.162     ad       2212:                return false;
1.211     riastrad 2213:        }
1.125     ad       2214:
1.162     ad       2215:        if (__predict_false((*pc->pc_ctor)(pc->pc_arg, object, flags) != 0)) {
1.134     ad       2216:                pool_put(&pc->pc_pool, object);
                   2217:                *objectp = NULL;
1.162     ad       2218:                return false;
1.43      thorpej  2219:        }
                   2220:
1.134     ad       2221:        KASSERT((((vaddr_t)object + pc->pc_pool.pr_itemoffset) &
                   2222:            (pc->pc_pool.pr_align - 1)) == 0);
1.43      thorpej  2223:
1.134     ad       2224:        if (pap != NULL) {
                   2225: #ifdef POOL_VTOPHYS
                   2226:                *pap = POOL_VTOPHYS(object);
                   2227: #else
                   2228:                *pap = POOL_PADDR_INVALID;
                   2229: #endif
1.102     chs      2230:        }
1.43      thorpej  2231:
1.125     ad       2232:        FREECHECK_OUT(&pc->pc_freecheck, object);
1.204     maxv     2233:        pool_redzone_fill(&pc->pc_pool, object);
1.162     ad       2234:        return false;
1.43      thorpej  2235: }
                   2236:
                   2237: /*
1.134     ad       2238:  * pool_cache_get{,_paddr}:
1.43      thorpej  2239:  *
1.134     ad       2240:  *     Get an object from a pool cache (optionally returning
                   2241:  *     the physical address of the object).
1.43      thorpej  2242:  */
1.134     ad       2243: void *
                   2244: pool_cache_get_paddr(pool_cache_t pc, int flags, paddr_t *pap)
1.43      thorpej  2245: {
1.134     ad       2246:        pool_cache_cpu_t *cc;
                   2247:        pcg_t *pcg;
                   2248:        void *object;
1.60      thorpej  2249:        int s;
1.43      thorpej  2250:
1.215     christos 2251:        KASSERT(!(flags & PR_NOWAIT) != !(flags & PR_WAITOK));
1.184     rmind    2252:        KASSERTMSG((!cpu_intr_p() && !cpu_softintr_p()) ||
1.185     rmind    2253:            (pc->pc_pool.pr_ipl != IPL_NONE || cold || panicstr != NULL),
1.213     christos 2254:            "%s: [%s] is IPL_NONE, but called from interrupt context",
                   2255:            __func__, pc->pc_pool.pr_wchan);
1.184     rmind    2256:
1.155     ad       2257:        if (flags & PR_WAITOK) {
1.154     yamt     2258:                ASSERT_SLEEPABLE();
1.155     ad       2259:        }
1.125     ad       2260:
1.162     ad       2261:        /* Lock out interrupts and disable preemption. */
                   2262:        s = splvm();
1.165     yamt     2263:        while (/* CONSTCOND */ true) {
1.134     ad       2264:                /* Try and allocate an object from the current group. */
1.162     ad       2265:                cc = pc->pc_cpus[curcpu()->ci_index];
                   2266:                KASSERT(cc->cc_cache == pc);
1.134     ad       2267:                pcg = cc->cc_current;
1.162     ad       2268:                if (__predict_true(pcg->pcg_avail > 0)) {
1.134     ad       2269:                        object = pcg->pcg_objects[--pcg->pcg_avail].pcgo_va;
1.162     ad       2270:                        if (__predict_false(pap != NULL))
1.134     ad       2271:                                *pap = pcg->pcg_objects[pcg->pcg_avail].pcgo_pa;
1.148     yamt     2272: #if defined(DIAGNOSTIC)
1.134     ad       2273:                        pcg->pcg_objects[pcg->pcg_avail].pcgo_va = NULL;
1.163     ad       2274:                        KASSERT(pcg->pcg_avail < pcg->pcg_size);
1.134     ad       2275:                        KASSERT(object != NULL);
1.163     ad       2276: #endif
1.134     ad       2277:                        cc->cc_hits++;
1.162     ad       2278:                        splx(s);
1.134     ad       2279:                        FREECHECK_OUT(&pc->pc_freecheck, object);
1.204     maxv     2280:                        pool_redzone_fill(&pc->pc_pool, object);
1.134     ad       2281:                        return object;
1.43      thorpej  2282:                }
                   2283:
                   2284:                /*
1.134     ad       2285:                 * That failed.  If the previous group isn't empty, swap
                   2286:                 * it with the current group and allocate from there.
1.43      thorpej  2287:                 */
1.134     ad       2288:                pcg = cc->cc_previous;
1.162     ad       2289:                if (__predict_true(pcg->pcg_avail > 0)) {
1.134     ad       2290:                        cc->cc_previous = cc->cc_current;
                   2291:                        cc->cc_current = pcg;
                   2292:                        continue;
1.43      thorpej  2293:                }
                   2294:
1.134     ad       2295:                /*
                   2296:                 * Can't allocate from either group: try the slow path.
                   2297:                 * If get_slow() allocated an object for us, or if
1.162     ad       2298:                 * no more objects are available, it will return false.
1.134     ad       2299:                 * Otherwise, we need to retry.
                   2300:                 */
1.165     yamt     2301:                if (!pool_cache_get_slow(cc, s, &object, pap, flags))
                   2302:                        break;
                   2303:        }
1.43      thorpej  2304:
1.211     riastrad 2305:        /*
                   2306:         * We would like to KASSERT(object || (flags & PR_NOWAIT)), but
                   2307:         * pool_cache_get can fail even in the PR_WAITOK case, if the
                   2308:         * constructor fails.
                   2309:         */
1.134     ad       2310:        return object;
1.51      thorpej  2311: }
                   2312:
1.162     ad       2313: static bool __noinline
                   2314: pool_cache_put_slow(pool_cache_cpu_t *cc, int s, void *object)
1.51      thorpej  2315: {
1.200     pooka    2316:        struct lwp *l = curlwp;
1.163     ad       2317:        pcg_t *pcg, *cur;
1.134     ad       2318:        uint64_t ncsw;
                   2319:        pool_cache_t pc;
1.51      thorpej  2320:
1.168     yamt     2321:        KASSERT(cc->cc_current->pcg_avail == cc->cc_current->pcg_size);
                   2322:        KASSERT(cc->cc_previous->pcg_avail == cc->cc_previous->pcg_size);
                   2323:
1.134     ad       2324:        pc = cc->cc_cache;
1.171     ad       2325:        pcg = NULL;
1.134     ad       2326:        cc->cc_misses++;
1.200     pooka    2327:        ncsw = l->l_ncsw;
1.43      thorpej  2328:
1.171     ad       2329:        /*
                   2330:         * If there are no empty groups in the cache then allocate one
                   2331:         * while still unlocked.
                   2332:         */
                   2333:        if (__predict_false(pc->pc_emptygroups == NULL)) {
                   2334:                if (__predict_true(!pool_cache_disable)) {
                   2335:                        pcg = pool_get(pc->pc_pcgpool, PR_NOWAIT);
                   2336:                }
1.200     pooka    2337:                /*
                   2338:                 * If pool_get() blocked, then our view of
                   2339:                 * the per-CPU data is invalid: retry.
                   2340:                 */
                   2341:                if (__predict_false(l->l_ncsw != ncsw)) {
                   2342:                        if (pcg != NULL) {
                   2343:                                pool_put(pc->pc_pcgpool, pcg);
                   2344:                        }
                   2345:                        return true;
                   2346:                }
1.171     ad       2347:                if (__predict_true(pcg != NULL)) {
                   2348:                        pcg->pcg_avail = 0;
                   2349:                        pcg->pcg_size = pc->pc_pcgsize;
                   2350:                }
                   2351:        }
                   2352:
1.162     ad       2353:        /* Lock the cache. */
                   2354:        if (__predict_false(!mutex_tryenter(&pc->pc_lock))) {
1.134     ad       2355:                mutex_enter(&pc->pc_lock);
                   2356:                pc->pc_contended++;
1.162     ad       2357:
1.163     ad       2358:                /*
                   2359:                 * If we context switched while locking, then our view of
                   2360:                 * the per-CPU data is invalid: retry.
                   2361:                 */
1.200     pooka    2362:                if (__predict_false(l->l_ncsw != ncsw)) {
1.163     ad       2363:                        mutex_exit(&pc->pc_lock);
1.171     ad       2364:                        if (pcg != NULL) {
                   2365:                                pool_put(pc->pc_pcgpool, pcg);
                   2366:                        }
1.163     ad       2367:                        return true;
                   2368:                }
1.162     ad       2369:        }
1.102     chs      2370:
1.163     ad       2371:        /* If there are no empty groups in the cache then allocate one. */
1.171     ad       2372:        if (pcg == NULL && pc->pc_emptygroups != NULL) {
                   2373:                pcg = pc->pc_emptygroups;
1.163     ad       2374:                pc->pc_emptygroups = pcg->pcg_next;
                   2375:                pc->pc_nempty--;
1.134     ad       2376:        }
1.130     ad       2377:
1.162     ad       2378:        /*
                   2379:         * If there's a empty group, release our full group back
                   2380:         * to the cache.  Install the empty group to the local CPU
                   2381:         * and return.
                   2382:         */
1.163     ad       2383:        if (pcg != NULL) {
1.134     ad       2384:                KASSERT(pcg->pcg_avail == 0);
1.162     ad       2385:                if (__predict_false(cc->cc_previous == &pcg_dummy)) {
1.146     ad       2386:                        cc->cc_previous = pcg;
                   2387:                } else {
1.162     ad       2388:                        cur = cc->cc_current;
                   2389:                        if (__predict_true(cur != &pcg_dummy)) {
1.163     ad       2390:                                KASSERT(cur->pcg_avail == cur->pcg_size);
1.146     ad       2391:                                cur->pcg_next = pc->pc_fullgroups;
                   2392:                                pc->pc_fullgroups = cur;
                   2393:                                pc->pc_nfull++;
                   2394:                        }
                   2395:                        cc->cc_current = pcg;
                   2396:                }
1.163     ad       2397:                pc->pc_hits++;
1.134     ad       2398:                mutex_exit(&pc->pc_lock);
1.162     ad       2399:                return true;
1.102     chs      2400:        }
1.105     christos 2401:
1.134     ad       2402:        /*
1.162     ad       2403:         * Nothing available locally or in cache, and we didn't
                   2404:         * allocate an empty group.  Take the slow path and destroy
                   2405:         * the object here and now.
1.134     ad       2406:         */
                   2407:        pc->pc_misses++;
                   2408:        mutex_exit(&pc->pc_lock);
1.162     ad       2409:        splx(s);
                   2410:        pool_cache_destruct_object(pc, object);
1.105     christos 2411:
1.162     ad       2412:        return false;
1.134     ad       2413: }
1.102     chs      2414:
1.43      thorpej  2415: /*
1.134     ad       2416:  * pool_cache_put{,_paddr}:
1.43      thorpej  2417:  *
1.134     ad       2418:  *     Put an object back to the pool cache (optionally caching the
                   2419:  *     physical address of the object).
1.43      thorpej  2420:  */
1.101     thorpej  2421: void
1.134     ad       2422: pool_cache_put_paddr(pool_cache_t pc, void *object, paddr_t pa)
1.43      thorpej  2423: {
1.134     ad       2424:        pool_cache_cpu_t *cc;
                   2425:        pcg_t *pcg;
                   2426:        int s;
1.101     thorpej  2427:
1.172     yamt     2428:        KASSERT(object != NULL);
1.204     maxv     2429:        pool_redzone_check(&pc->pc_pool, object);
1.134     ad       2430:        FREECHECK_IN(&pc->pc_freecheck, object);
1.101     thorpej  2431:
1.162     ad       2432:        /* Lock out interrupts and disable preemption. */
                   2433:        s = splvm();
1.165     yamt     2434:        while (/* CONSTCOND */ true) {
1.134     ad       2435:                /* If the current group isn't full, release it there. */
1.162     ad       2436:                cc = pc->pc_cpus[curcpu()->ci_index];
                   2437:                KASSERT(cc->cc_cache == pc);
1.134     ad       2438:                pcg = cc->cc_current;
1.162     ad       2439:                if (__predict_true(pcg->pcg_avail < pcg->pcg_size)) {
1.134     ad       2440:                        pcg->pcg_objects[pcg->pcg_avail].pcgo_va = object;
                   2441:                        pcg->pcg_objects[pcg->pcg_avail].pcgo_pa = pa;
                   2442:                        pcg->pcg_avail++;
                   2443:                        cc->cc_hits++;
1.162     ad       2444:                        splx(s);
1.134     ad       2445:                        return;
                   2446:                }
1.43      thorpej  2447:
1.134     ad       2448:                /*
1.162     ad       2449:                 * That failed.  If the previous group isn't full, swap
1.134     ad       2450:                 * it with the current group and try again.
                   2451:                 */
                   2452:                pcg = cc->cc_previous;
1.162     ad       2453:                if (__predict_true(pcg->pcg_avail < pcg->pcg_size)) {
1.134     ad       2454:                        cc->cc_previous = cc->cc_current;
                   2455:                        cc->cc_current = pcg;
                   2456:                        continue;
                   2457:                }
1.43      thorpej  2458:
1.134     ad       2459:                /*
                   2460:                 * Can't free to either group: try the slow path.
                   2461:                 * If put_slow() releases the object for us, it
1.162     ad       2462:                 * will return false.  Otherwise we need to retry.
1.134     ad       2463:                 */
1.165     yamt     2464:                if (!pool_cache_put_slow(cc, s, object))
                   2465:                        break;
                   2466:        }
1.43      thorpej  2467: }
                   2468:
                   2469: /*
1.196     jym      2470:  * pool_cache_transfer:
1.43      thorpej  2471:  *
1.134     ad       2472:  *     Transfer objects from the per-CPU cache to the global cache.
                   2473:  *     Run within a cross-call thread.
1.43      thorpej  2474:  */
                   2475: static void
1.196     jym      2476: pool_cache_transfer(pool_cache_t pc)
1.43      thorpej  2477: {
1.134     ad       2478:        pool_cache_cpu_t *cc;
                   2479:        pcg_t *prev, *cur, **list;
1.162     ad       2480:        int s;
1.134     ad       2481:
1.162     ad       2482:        s = splvm();
                   2483:        mutex_enter(&pc->pc_lock);
                   2484:        cc = pc->pc_cpus[curcpu()->ci_index];
1.134     ad       2485:        cur = cc->cc_current;
1.169     yamt     2486:        cc->cc_current = __UNCONST(&pcg_dummy);
1.134     ad       2487:        prev = cc->cc_previous;
1.169     yamt     2488:        cc->cc_previous = __UNCONST(&pcg_dummy);
1.162     ad       2489:        if (cur != &pcg_dummy) {
1.142     ad       2490:                if (cur->pcg_avail == cur->pcg_size) {
1.134     ad       2491:                        list = &pc->pc_fullgroups;
                   2492:                        pc->pc_nfull++;
                   2493:                } else if (cur->pcg_avail == 0) {
                   2494:                        list = &pc->pc_emptygroups;
                   2495:                        pc->pc_nempty++;
                   2496:                } else {
                   2497:                        list = &pc->pc_partgroups;
                   2498:                        pc->pc_npart++;
                   2499:                }
                   2500:                cur->pcg_next = *list;
                   2501:                *list = cur;
                   2502:        }
1.162     ad       2503:        if (prev != &pcg_dummy) {
1.142     ad       2504:                if (prev->pcg_avail == prev->pcg_size) {
1.134     ad       2505:                        list = &pc->pc_fullgroups;
                   2506:                        pc->pc_nfull++;
                   2507:                } else if (prev->pcg_avail == 0) {
                   2508:                        list = &pc->pc_emptygroups;
                   2509:                        pc->pc_nempty++;
                   2510:                } else {
                   2511:                        list = &pc->pc_partgroups;
                   2512:                        pc->pc_npart++;
                   2513:                }
                   2514:                prev->pcg_next = *list;
                   2515:                *list = prev;
                   2516:        }
                   2517:        mutex_exit(&pc->pc_lock);
                   2518:        splx(s);
1.3       pk       2519: }
1.66      thorpej  2520:
                   2521: /*
                   2522:  * Pool backend allocators.
                   2523:  *
                   2524:  * Each pool has a backend allocator that handles allocation, deallocation,
                   2525:  * and any additional draining that might be needed.
                   2526:  *
                   2527:  * We provide two standard allocators:
                   2528:  *
                   2529:  *     pool_allocator_kmem - the default when no allocator is specified
                   2530:  *
                   2531:  *     pool_allocator_nointr - used for pools that will not be accessed
                   2532:  *     in interrupt context.
                   2533:  */
                   2534: void   *pool_page_alloc(struct pool *, int);
                   2535: void   pool_page_free(struct pool *, void *);
                   2536:
1.112     bjh21    2537: #ifdef POOL_SUBPAGE
                   2538: struct pool_allocator pool_allocator_kmem_fullpage = {
1.192     rmind    2539:        .pa_alloc = pool_page_alloc,
                   2540:        .pa_free = pool_page_free,
                   2541:        .pa_pagesz = 0
1.112     bjh21    2542: };
                   2543: #else
1.66      thorpej  2544: struct pool_allocator pool_allocator_kmem = {
1.191     para     2545:        .pa_alloc = pool_page_alloc,
                   2546:        .pa_free = pool_page_free,
                   2547:        .pa_pagesz = 0
1.66      thorpej  2548: };
1.112     bjh21    2549: #endif
1.66      thorpej  2550:
1.112     bjh21    2551: #ifdef POOL_SUBPAGE
                   2552: struct pool_allocator pool_allocator_nointr_fullpage = {
1.194     para     2553:        .pa_alloc = pool_page_alloc,
                   2554:        .pa_free = pool_page_free,
1.192     rmind    2555:        .pa_pagesz = 0
1.112     bjh21    2556: };
                   2557: #else
1.66      thorpej  2558: struct pool_allocator pool_allocator_nointr = {
1.191     para     2559:        .pa_alloc = pool_page_alloc,
                   2560:        .pa_free = pool_page_free,
                   2561:        .pa_pagesz = 0
1.66      thorpej  2562: };
1.112     bjh21    2563: #endif
1.66      thorpej  2564:
                   2565: #ifdef POOL_SUBPAGE
                   2566: void   *pool_subpage_alloc(struct pool *, int);
                   2567: void   pool_subpage_free(struct pool *, void *);
                   2568:
1.112     bjh21    2569: struct pool_allocator pool_allocator_kmem = {
1.193     he       2570:        .pa_alloc = pool_subpage_alloc,
                   2571:        .pa_free = pool_subpage_free,
                   2572:        .pa_pagesz = POOL_SUBPAGE
1.112     bjh21    2573: };
                   2574:
                   2575: struct pool_allocator pool_allocator_nointr = {
1.192     rmind    2576:        .pa_alloc = pool_subpage_alloc,
                   2577:        .pa_free = pool_subpage_free,
                   2578:        .pa_pagesz = POOL_SUBPAGE
1.66      thorpej  2579: };
                   2580: #endif /* POOL_SUBPAGE */
                   2581:
1.208     chs      2582: struct pool_allocator pool_allocator_big[] = {
                   2583:        {
                   2584:                .pa_alloc = pool_page_alloc,
                   2585:                .pa_free = pool_page_free,
                   2586:                .pa_pagesz = 1 << (POOL_ALLOCATOR_BIG_BASE + 0),
                   2587:        },
                   2588:        {
                   2589:                .pa_alloc = pool_page_alloc,
                   2590:                .pa_free = pool_page_free,
                   2591:                .pa_pagesz = 1 << (POOL_ALLOCATOR_BIG_BASE + 1),
                   2592:        },
                   2593:        {
                   2594:                .pa_alloc = pool_page_alloc,
                   2595:                .pa_free = pool_page_free,
                   2596:                .pa_pagesz = 1 << (POOL_ALLOCATOR_BIG_BASE + 2),
                   2597:        },
                   2598:        {
                   2599:                .pa_alloc = pool_page_alloc,
                   2600:                .pa_free = pool_page_free,
                   2601:                .pa_pagesz = 1 << (POOL_ALLOCATOR_BIG_BASE + 3),
                   2602:        },
                   2603:        {
                   2604:                .pa_alloc = pool_page_alloc,
                   2605:                .pa_free = pool_page_free,
                   2606:                .pa_pagesz = 1 << (POOL_ALLOCATOR_BIG_BASE + 4),
                   2607:        },
                   2608:        {
                   2609:                .pa_alloc = pool_page_alloc,
                   2610:                .pa_free = pool_page_free,
                   2611:                .pa_pagesz = 1 << (POOL_ALLOCATOR_BIG_BASE + 5),
                   2612:        },
                   2613:        {
                   2614:                .pa_alloc = pool_page_alloc,
                   2615:                .pa_free = pool_page_free,
                   2616:                .pa_pagesz = 1 << (POOL_ALLOCATOR_BIG_BASE + 6),
                   2617:        },
                   2618:        {
                   2619:                .pa_alloc = pool_page_alloc,
                   2620:                .pa_free = pool_page_free,
                   2621:                .pa_pagesz = 1 << (POOL_ALLOCATOR_BIG_BASE + 7),
                   2622:        }
                   2623: };
                   2624:
                   2625: static int
                   2626: pool_bigidx(size_t size)
                   2627: {
                   2628:        int i;
                   2629:
                   2630:        for (i = 0; i < __arraycount(pool_allocator_big); i++) {
                   2631:                if (1 << (i + POOL_ALLOCATOR_BIG_BASE) >= size)
                   2632:                        return i;
                   2633:        }
                   2634:        panic("pool item size %zu too large, use a custom allocator", size);
                   2635: }
                   2636:
1.117     yamt     2637: static void *
                   2638: pool_allocator_alloc(struct pool *pp, int flags)
1.66      thorpej  2639: {
1.117     yamt     2640:        struct pool_allocator *pa = pp->pr_alloc;
1.66      thorpej  2641:        void *res;
                   2642:
1.117     yamt     2643:        res = (*pa->pa_alloc)(pp, flags);
                   2644:        if (res == NULL && (flags & PR_WAITOK) == 0) {
1.66      thorpej  2645:                /*
1.117     yamt     2646:                 * We only run the drain hook here if PR_NOWAIT.
                   2647:                 * In other cases, the hook will be run in
                   2648:                 * pool_reclaim().
1.66      thorpej  2649:                 */
1.117     yamt     2650:                if (pp->pr_drain_hook != NULL) {
                   2651:                        (*pp->pr_drain_hook)(pp->pr_drain_hook_arg, flags);
                   2652:                        res = (*pa->pa_alloc)(pp, flags);
1.66      thorpej  2653:                }
1.117     yamt     2654:        }
                   2655:        return res;
1.66      thorpej  2656: }
                   2657:
1.117     yamt     2658: static void
1.66      thorpej  2659: pool_allocator_free(struct pool *pp, void *v)
                   2660: {
                   2661:        struct pool_allocator *pa = pp->pr_alloc;
                   2662:
                   2663:        (*pa->pa_free)(pp, v);
                   2664: }
                   2665:
                   2666: void *
1.124     yamt     2667: pool_page_alloc(struct pool *pp, int flags)
1.66      thorpej  2668: {
1.192     rmind    2669:        const vm_flag_t vflags = (flags & PR_WAITOK) ? VM_SLEEP: VM_NOSLEEP;
1.191     para     2670:        vmem_addr_t va;
1.192     rmind    2671:        int ret;
1.191     para     2672:
1.192     rmind    2673:        ret = uvm_km_kmem_alloc(kmem_va_arena, pp->pr_alloc->pa_pagesz,
                   2674:            vflags | VM_INSTANTFIT, &va);
1.66      thorpej  2675:
1.192     rmind    2676:        return ret ? NULL : (void *)va;
1.66      thorpej  2677: }
                   2678:
                   2679: void
1.124     yamt     2680: pool_page_free(struct pool *pp, void *v)
1.66      thorpej  2681: {
                   2682:
1.191     para     2683:        uvm_km_kmem_free(kmem_va_arena, (vaddr_t)v, pp->pr_alloc->pa_pagesz);
1.98      yamt     2684: }
                   2685:
                   2686: static void *
1.124     yamt     2687: pool_page_alloc_meta(struct pool *pp, int flags)
1.98      yamt     2688: {
1.192     rmind    2689:        const vm_flag_t vflags = (flags & PR_WAITOK) ? VM_SLEEP: VM_NOSLEEP;
                   2690:        vmem_addr_t va;
                   2691:        int ret;
1.191     para     2692:
1.192     rmind    2693:        ret = vmem_alloc(kmem_meta_arena, pp->pr_alloc->pa_pagesz,
                   2694:            vflags | VM_INSTANTFIT, &va);
1.98      yamt     2695:
1.192     rmind    2696:        return ret ? NULL : (void *)va;
1.98      yamt     2697: }
                   2698:
                   2699: static void
1.124     yamt     2700: pool_page_free_meta(struct pool *pp, void *v)
1.98      yamt     2701: {
                   2702:
1.192     rmind    2703:        vmem_free(kmem_meta_arena, (vmem_addr_t)v, pp->pr_alloc->pa_pagesz);
1.66      thorpej  2704: }
                   2705:
1.204     maxv     2706: #ifdef POOL_REDZONE
                   2707: #if defined(_LP64)
                   2708: # define PRIME 0x9e37fffffffc0000UL
                   2709: #else /* defined(_LP64) */
                   2710: # define PRIME 0x9e3779b1
                   2711: #endif /* defined(_LP64) */
                   2712: #define STATIC_BYTE    0xFE
                   2713: CTASSERT(POOL_REDZONE_SIZE > 1);
                   2714:
                   2715: static inline uint8_t
                   2716: pool_pattern_generate(const void *p)
                   2717: {
                   2718:        return (uint8_t)(((uintptr_t)p) * PRIME
                   2719:           >> ((sizeof(uintptr_t) - sizeof(uint8_t))) * CHAR_BIT);
                   2720: }
                   2721:
                   2722: static void
                   2723: pool_redzone_init(struct pool *pp, size_t requested_size)
                   2724: {
                   2725:        size_t nsz;
                   2726:
                   2727:        if (pp->pr_roflags & PR_NOTOUCH) {
                   2728:                pp->pr_reqsize = 0;
                   2729:                pp->pr_redzone = false;
                   2730:                return;
                   2731:        }
                   2732:
                   2733:        /*
                   2734:         * We may have extended the requested size earlier; check if
                   2735:         * there's naturally space in the padding for a red zone.
                   2736:         */
                   2737:        if (pp->pr_size - requested_size >= POOL_REDZONE_SIZE) {
                   2738:                pp->pr_reqsize = requested_size;
                   2739:                pp->pr_redzone = true;
                   2740:                return;
                   2741:        }
                   2742:
                   2743:        /*
                   2744:         * No space in the natural padding; check if we can extend a
                   2745:         * bit the size of the pool.
                   2746:         */
                   2747:        nsz = roundup(pp->pr_size + POOL_REDZONE_SIZE, pp->pr_align);
                   2748:        if (nsz <= pp->pr_alloc->pa_pagesz) {
                   2749:                /* Ok, we can */
                   2750:                pp->pr_size = nsz;
                   2751:                pp->pr_reqsize = requested_size;
                   2752:                pp->pr_redzone = true;
                   2753:        } else {
                   2754:                /* No space for a red zone... snif :'( */
                   2755:                pp->pr_reqsize = 0;
                   2756:                pp->pr_redzone = false;
                   2757:                printf("pool redzone disabled for '%s'\n", pp->pr_wchan);
                   2758:        }
                   2759: }
                   2760:
                   2761: static void
                   2762: pool_redzone_fill(struct pool *pp, void *p)
                   2763: {
                   2764:        uint8_t *cp, pat;
                   2765:        const uint8_t *ep;
                   2766:
                   2767:        if (!pp->pr_redzone)
                   2768:                return;
                   2769:
                   2770:        cp = (uint8_t *)p + pp->pr_reqsize;
                   2771:        ep = cp + POOL_REDZONE_SIZE;
                   2772:
                   2773:        /*
                   2774:         * We really don't want the first byte of the red zone to be '\0';
                   2775:         * an off-by-one in a string may not be properly detected.
                   2776:         */
                   2777:        pat = pool_pattern_generate(cp);
                   2778:        *cp = (pat == '\0') ? STATIC_BYTE: pat;
                   2779:        cp++;
                   2780:
                   2781:        while (cp < ep) {
                   2782:                *cp = pool_pattern_generate(cp);
                   2783:                cp++;
                   2784:        }
                   2785: }
                   2786:
                   2787: static void
                   2788: pool_redzone_check(struct pool *pp, void *p)
                   2789: {
                   2790:        uint8_t *cp, pat, expected;
                   2791:        const uint8_t *ep;
                   2792:
                   2793:        if (!pp->pr_redzone)
                   2794:                return;
                   2795:
                   2796:        cp = (uint8_t *)p + pp->pr_reqsize;
                   2797:        ep = cp + POOL_REDZONE_SIZE;
                   2798:
                   2799:        pat = pool_pattern_generate(cp);
                   2800:        expected = (pat == '\0') ? STATIC_BYTE: pat;
                   2801:        if (expected != *cp) {
                   2802:                panic("%s: %p: 0x%02x != 0x%02x\n",
                   2803:                   __func__, cp, *cp, expected);
                   2804:        }
                   2805:        cp++;
                   2806:
                   2807:        while (cp < ep) {
                   2808:                expected = pool_pattern_generate(cp);
                   2809:                if (*cp != expected) {
                   2810:                        panic("%s: %p: 0x%02x != 0x%02x\n",
                   2811:                           __func__, cp, *cp, expected);
                   2812:                }
                   2813:                cp++;
                   2814:        }
                   2815: }
                   2816:
                   2817: #endif /* POOL_REDZONE */
                   2818:
                   2819:
1.66      thorpej  2820: #ifdef POOL_SUBPAGE
                   2821: /* Sub-page allocator, for machines with large hardware pages. */
                   2822: void *
                   2823: pool_subpage_alloc(struct pool *pp, int flags)
                   2824: {
1.134     ad       2825:        return pool_get(&psppool, flags);
1.66      thorpej  2826: }
                   2827:
                   2828: void
                   2829: pool_subpage_free(struct pool *pp, void *v)
                   2830: {
                   2831:        pool_put(&psppool, v);
                   2832: }
                   2833:
1.112     bjh21    2834: #endif /* POOL_SUBPAGE */
1.141     yamt     2835:
                   2836: #if defined(DDB)
                   2837: static bool
                   2838: pool_in_page(struct pool *pp, struct pool_item_header *ph, uintptr_t addr)
                   2839: {
                   2840:
                   2841:        return (uintptr_t)ph->ph_page <= addr &&
                   2842:            addr < (uintptr_t)ph->ph_page + pp->pr_alloc->pa_pagesz;
                   2843: }
                   2844:
1.143     yamt     2845: static bool
                   2846: pool_in_item(struct pool *pp, void *item, uintptr_t addr)
                   2847: {
                   2848:
                   2849:        return (uintptr_t)item <= addr && addr < (uintptr_t)item + pp->pr_size;
                   2850: }
                   2851:
                   2852: static bool
                   2853: pool_in_cg(struct pool *pp, struct pool_cache_group *pcg, uintptr_t addr)
                   2854: {
                   2855:        int i;
                   2856:
                   2857:        if (pcg == NULL) {
                   2858:                return false;
                   2859:        }
1.144     yamt     2860:        for (i = 0; i < pcg->pcg_avail; i++) {
1.143     yamt     2861:                if (pool_in_item(pp, pcg->pcg_objects[i].pcgo_va, addr)) {
                   2862:                        return true;
                   2863:                }
                   2864:        }
                   2865:        return false;
                   2866: }
                   2867:
                   2868: static bool
                   2869: pool_allocated(struct pool *pp, struct pool_item_header *ph, uintptr_t addr)
                   2870: {
                   2871:
                   2872:        if ((pp->pr_roflags & PR_NOTOUCH) != 0) {
                   2873:                unsigned int idx = pr_item_notouch_index(pp, ph, (void *)addr);
                   2874:                pool_item_bitmap_t *bitmap =
                   2875:                    ph->ph_bitmap + (idx / BITMAP_SIZE);
                   2876:                pool_item_bitmap_t mask = 1 << (idx & BITMAP_MASK);
                   2877:
                   2878:                return (*bitmap & mask) == 0;
                   2879:        } else {
                   2880:                struct pool_item *pi;
                   2881:
                   2882:                LIST_FOREACH(pi, &ph->ph_itemlist, pi_list) {
                   2883:                        if (pool_in_item(pp, pi, addr)) {
                   2884:                                return false;
                   2885:                        }
                   2886:                }
                   2887:                return true;
                   2888:        }
                   2889: }
                   2890:
1.141     yamt     2891: void
                   2892: pool_whatis(uintptr_t addr, void (*pr)(const char *, ...))
                   2893: {
                   2894:        struct pool *pp;
                   2895:
1.145     ad       2896:        TAILQ_FOREACH(pp, &pool_head, pr_poollist) {
1.141     yamt     2897:                struct pool_item_header *ph;
                   2898:                uintptr_t item;
1.143     yamt     2899:                bool allocated = true;
                   2900:                bool incache = false;
                   2901:                bool incpucache = false;
                   2902:                char cpucachestr[32];
1.141     yamt     2903:
                   2904:                if ((pp->pr_roflags & PR_PHINPAGE) != 0) {
                   2905:                        LIST_FOREACH(ph, &pp->pr_fullpages, ph_pagelist) {
                   2906:                                if (pool_in_page(pp, ph, addr)) {
                   2907:                                        goto found;
                   2908:                                }
                   2909:                        }
                   2910:                        LIST_FOREACH(ph, &pp->pr_partpages, ph_pagelist) {
                   2911:                                if (pool_in_page(pp, ph, addr)) {
1.143     yamt     2912:                                        allocated =
                   2913:                                            pool_allocated(pp, ph, addr);
                   2914:                                        goto found;
                   2915:                                }
                   2916:                        }
                   2917:                        LIST_FOREACH(ph, &pp->pr_emptypages, ph_pagelist) {
                   2918:                                if (pool_in_page(pp, ph, addr)) {
                   2919:                                        allocated = false;
1.141     yamt     2920:                                        goto found;
                   2921:                                }
                   2922:                        }
                   2923:                        continue;
                   2924:                } else {
                   2925:                        ph = pr_find_pagehead_noalign(pp, (void *)addr);
                   2926:                        if (ph == NULL || !pool_in_page(pp, ph, addr)) {
                   2927:                                continue;
                   2928:                        }
1.143     yamt     2929:                        allocated = pool_allocated(pp, ph, addr);
1.141     yamt     2930:                }
                   2931: found:
1.143     yamt     2932:                if (allocated && pp->pr_cache) {
                   2933:                        pool_cache_t pc = pp->pr_cache;
                   2934:                        struct pool_cache_group *pcg;
                   2935:                        int i;
                   2936:
                   2937:                        for (pcg = pc->pc_fullgroups; pcg != NULL;
                   2938:                            pcg = pcg->pcg_next) {
                   2939:                                if (pool_in_cg(pp, pcg, addr)) {
                   2940:                                        incache = true;
                   2941:                                        goto print;
                   2942:                                }
                   2943:                        }
1.183     ad       2944:                        for (i = 0; i < __arraycount(pc->pc_cpus); i++) {
1.143     yamt     2945:                                pool_cache_cpu_t *cc;
                   2946:
                   2947:                                if ((cc = pc->pc_cpus[i]) == NULL) {
                   2948:                                        continue;
                   2949:                                }
                   2950:                                if (pool_in_cg(pp, cc->cc_current, addr) ||
                   2951:                                    pool_in_cg(pp, cc->cc_previous, addr)) {
                   2952:                                        struct cpu_info *ci =
1.170     ad       2953:                                            cpu_lookup(i);
1.143     yamt     2954:
                   2955:                                        incpucache = true;
                   2956:                                        snprintf(cpucachestr,
                   2957:                                            sizeof(cpucachestr),
                   2958:                                            "cached by CPU %u",
1.153     martin   2959:                                            ci->ci_index);
1.143     yamt     2960:                                        goto print;
                   2961:                                }
                   2962:                        }
                   2963:                }
                   2964: print:
1.141     yamt     2965:                item = (uintptr_t)ph->ph_page + ph->ph_off;
                   2966:                item = item + rounddown(addr - item, pp->pr_size);
1.143     yamt     2967:                (*pr)("%p is %p+%zu in POOL '%s' (%s)\n",
1.141     yamt     2968:                    (void *)addr, item, (size_t)(addr - item),
1.143     yamt     2969:                    pp->pr_wchan,
                   2970:                    incpucache ? cpucachestr :
                   2971:                    incache ? "cached" : allocated ? "allocated" : "free");
1.141     yamt     2972:        }
                   2973: }
                   2974: #endif /* defined(DDB) */
1.203     joerg    2975:
                   2976: static int
                   2977: pool_sysctl(SYSCTLFN_ARGS)
                   2978: {
                   2979:        struct pool_sysctl data;
                   2980:        struct pool *pp;
                   2981:        struct pool_cache *pc;
                   2982:        pool_cache_cpu_t *cc;
                   2983:        int error;
                   2984:        size_t i, written;
                   2985:
                   2986:        if (oldp == NULL) {
                   2987:                *oldlenp = 0;
                   2988:                TAILQ_FOREACH(pp, &pool_head, pr_poollist)
                   2989:                        *oldlenp += sizeof(data);
                   2990:                return 0;
                   2991:        }
                   2992:
                   2993:        memset(&data, 0, sizeof(data));
                   2994:        error = 0;
                   2995:        written = 0;
                   2996:        TAILQ_FOREACH(pp, &pool_head, pr_poollist) {
                   2997:                if (written + sizeof(data) > *oldlenp)
                   2998:                        break;
                   2999:                strlcpy(data.pr_wchan, pp->pr_wchan, sizeof(data.pr_wchan));
                   3000:                data.pr_pagesize = pp->pr_alloc->pa_pagesz;
                   3001:                data.pr_flags = pp->pr_roflags | pp->pr_flags;
                   3002: #define COPY(field) data.field = pp->field
                   3003:                COPY(pr_size);
                   3004:
                   3005:                COPY(pr_itemsperpage);
                   3006:                COPY(pr_nitems);
                   3007:                COPY(pr_nout);
                   3008:                COPY(pr_hardlimit);
                   3009:                COPY(pr_npages);
                   3010:                COPY(pr_minpages);
                   3011:                COPY(pr_maxpages);
                   3012:
                   3013:                COPY(pr_nget);
                   3014:                COPY(pr_nfail);
                   3015:                COPY(pr_nput);
                   3016:                COPY(pr_npagealloc);
                   3017:                COPY(pr_npagefree);
                   3018:                COPY(pr_hiwat);
                   3019:                COPY(pr_nidle);
                   3020: #undef COPY
                   3021:
                   3022:                data.pr_cache_nmiss_pcpu = 0;
                   3023:                data.pr_cache_nhit_pcpu = 0;
                   3024:                if (pp->pr_cache) {
                   3025:                        pc = pp->pr_cache;
                   3026:                        data.pr_cache_meta_size = pc->pc_pcgsize;
                   3027:                        data.pr_cache_nfull = pc->pc_nfull;
                   3028:                        data.pr_cache_npartial = pc->pc_npart;
                   3029:                        data.pr_cache_nempty = pc->pc_nempty;
                   3030:                        data.pr_cache_ncontended = pc->pc_contended;
                   3031:                        data.pr_cache_nmiss_global = pc->pc_misses;
                   3032:                        data.pr_cache_nhit_global = pc->pc_hits;
                   3033:                        for (i = 0; i < pc->pc_ncpu; ++i) {
                   3034:                                cc = pc->pc_cpus[i];
                   3035:                                if (cc == NULL)
                   3036:                                        continue;
1.206     knakahar 3037:                                data.pr_cache_nmiss_pcpu += cc->cc_misses;
                   3038:                                data.pr_cache_nhit_pcpu += cc->cc_hits;
1.203     joerg    3039:                        }
                   3040:                } else {
                   3041:                        data.pr_cache_meta_size = 0;
                   3042:                        data.pr_cache_nfull = 0;
                   3043:                        data.pr_cache_npartial = 0;
                   3044:                        data.pr_cache_nempty = 0;
                   3045:                        data.pr_cache_ncontended = 0;
                   3046:                        data.pr_cache_nmiss_global = 0;
                   3047:                        data.pr_cache_nhit_global = 0;
                   3048:                }
                   3049:
                   3050:                error = sysctl_copyout(l, &data, oldp, sizeof(data));
                   3051:                if (error)
                   3052:                        break;
                   3053:                written += sizeof(data);
                   3054:                oldp = (char *)oldp + sizeof(data);
                   3055:        }
                   3056:
                   3057:        *oldlenp = written;
                   3058:        return error;
                   3059: }
                   3060:
                   3061: SYSCTL_SETUP(sysctl_pool_setup, "sysctl kern.pool setup")
                   3062: {
                   3063:        const struct sysctlnode *rnode = NULL;
                   3064:
                   3065:        sysctl_createv(clog, 0, NULL, &rnode,
                   3066:                       CTLFLAG_PERMANENT,
                   3067:                       CTLTYPE_STRUCT, "pool",
                   3068:                       SYSCTL_DESCR("Get pool statistics"),
                   3069:                       pool_sysctl, 0, NULL, 0,
                   3070:                       CTL_KERN, CTL_CREATE, CTL_EOL);
                   3071: }

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