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Annotation of src/sys/kern/subr_pool.c, Revision 1.60.2.1

1.60.2.1! thorpej     1: /*     $NetBSD: subr_pool.c,v 1.65 2001/11/20 06:57:04 enami Exp $     */
1.1       pk          2:
                      3: /*-
1.43      thorpej     4:  * Copyright (c) 1997, 1999, 2000 The NetBSD Foundation, Inc.
1.1       pk          5:  * All rights reserved.
                      6:  *
                      7:  * This code is derived from software contributed to The NetBSD Foundation
1.20      thorpej     8:  * by Paul Kranenburg; by Jason R. Thorpe of the Numerical Aerospace
                      9:  * Simulation Facility, NASA Ames Research Center.
1.1       pk         10:  *
                     11:  * Redistribution and use in source and binary forms, with or without
                     12:  * modification, are permitted provided that the following conditions
                     13:  * are met:
                     14:  * 1. Redistributions of source code must retain the above copyright
                     15:  *    notice, this list of conditions and the following disclaimer.
                     16:  * 2. Redistributions in binary form must reproduce the above copyright
                     17:  *    notice, this list of conditions and the following disclaimer in the
                     18:  *    documentation and/or other materials provided with the distribution.
                     19:  * 3. All advertising materials mentioning features or use of this software
                     20:  *    must display the following acknowledgement:
1.13      christos   21:  *     This product includes software developed by the NetBSD
                     22:  *     Foundation, Inc. and its contributors.
1.1       pk         23:  * 4. Neither the name of The NetBSD Foundation nor the names of its
                     24:  *    contributors may be used to endorse or promote products derived
                     25:  *    from this software without specific prior written permission.
                     26:  *
                     27:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     28:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     29:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     30:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     31:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     32:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     33:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     34:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     35:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     36:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     37:  * POSSIBILITY OF SUCH DAMAGE.
                     38:  */
1.24      scottr     39:
1.60.2.1! thorpej    40: #include <sys/cdefs.h>
        !            41: __KERNEL_RCSID(0, "$NetBSD: subr_pool.c,v 1.65 2001/11/20 06:57:04 enami Exp $");
        !            42:
1.25      thorpej    43: #include "opt_pool.h"
1.24      scottr     44: #include "opt_poollog.h"
1.28      thorpej    45: #include "opt_lockdebug.h"
1.1       pk         46:
                     47: #include <sys/param.h>
                     48: #include <sys/systm.h>
                     49: #include <sys/proc.h>
                     50: #include <sys/errno.h>
                     51: #include <sys/kernel.h>
                     52: #include <sys/malloc.h>
                     53: #include <sys/lock.h>
                     54: #include <sys/pool.h>
1.20      thorpej    55: #include <sys/syslog.h>
1.3       pk         56:
                     57: #include <uvm/uvm.h>
                     58:
1.1       pk         59: /*
                     60:  * Pool resource management utility.
1.3       pk         61:  *
                     62:  * Memory is allocated in pages which are split into pieces according
                     63:  * to the pool item size. Each page is kept on a list headed by `pr_pagelist'
                     64:  * in the pool structure and the individual pool items are on a linked list
                     65:  * headed by `ph_itemlist' in each page header. The memory for building
                     66:  * the page list is either taken from the allocated pages themselves (for
                     67:  * small pool items) or taken from an internal pool of page headers (`phpool').
1.1       pk         68:  */
                     69:
1.3       pk         70: /* List of all pools */
1.5       thorpej    71: TAILQ_HEAD(,pool) pool_head = TAILQ_HEAD_INITIALIZER(pool_head);
1.3       pk         72:
                     73: /* Private pool for page header structures */
                     74: static struct pool phpool;
                     75:
1.60.2.1! thorpej    76: #ifdef POOL_SUBPAGE
        !            77: /* Pool of subpages for use by normal pools. */
        !            78: static struct pool psppool;
        !            79: #endif
        !            80:
1.3       pk         81: /* # of seconds to retain page after last use */
                     82: int pool_inactive_time = 10;
                     83:
                     84: /* Next candidate for drainage (see pool_drain()) */
1.23      thorpej    85: static struct pool     *drainpp;
                     86:
                     87: /* This spin lock protects both pool_head and drainpp. */
                     88: struct simplelock pool_head_slock = SIMPLELOCK_INITIALIZER;
1.3       pk         89:
                     90: struct pool_item_header {
                     91:        /* Page headers */
                     92:        TAILQ_ENTRY(pool_item_header)
                     93:                                ph_pagelist;    /* pool page list */
                     94:        TAILQ_HEAD(,pool_item)  ph_itemlist;    /* chunk list for this page */
                     95:        LIST_ENTRY(pool_item_header)
                     96:                                ph_hashlist;    /* Off-page page headers */
                     97:        int                     ph_nmissing;    /* # of chunks in use */
                     98:        caddr_t                 ph_page;        /* this page's address */
                     99:        struct timeval          ph_time;        /* last referenced */
                    100: };
1.60.2.1! thorpej   101: TAILQ_HEAD(pool_pagelist,pool_item_header);
1.3       pk        102:
1.1       pk        103: struct pool_item {
1.3       pk        104: #ifdef DIAGNOSTIC
                    105:        int pi_magic;
1.33      chs       106: #endif
1.25      thorpej   107: #define        PI_MAGIC 0xdeadbeef
1.3       pk        108:        /* Other entries use only this list entry */
                    109:        TAILQ_ENTRY(pool_item)  pi_list;
                    110: };
                    111:
1.25      thorpej   112: #define        PR_HASH_INDEX(pp,addr) \
1.3       pk        113:        (((u_long)(addr) >> (pp)->pr_pageshift) & (PR_HASHTABSIZE - 1))
                    114:
1.53      thorpej   115: #define        POOL_NEEDS_CATCHUP(pp)                                          \
                    116:        ((pp)->pr_nitems < (pp)->pr_minitems)
                    117:
1.43      thorpej   118: /*
                    119:  * Pool cache management.
                    120:  *
                    121:  * Pool caches provide a way for constructed objects to be cached by the
                    122:  * pool subsystem.  This can lead to performance improvements by avoiding
                    123:  * needless object construction/destruction; it is deferred until absolutely
                    124:  * necessary.
                    125:  *
                    126:  * Caches are grouped into cache groups.  Each cache group references
                    127:  * up to 16 constructed objects.  When a cache allocates an object
                    128:  * from the pool, it calls the object's constructor and places it into
                    129:  * a cache group.  When a cache group frees an object back to the pool,
                    130:  * it first calls the object's destructor.  This allows the object to
                    131:  * persist in constructed form while freed to the cache.
                    132:  *
                    133:  * Multiple caches may exist for each pool.  This allows a single
                    134:  * object type to have multiple constructed forms.  The pool references
                    135:  * each cache, so that when a pool is drained by the pagedaemon, it can
                    136:  * drain each individual cache as well.  Each time a cache is drained,
                    137:  * the most idle cache group is freed to the pool in its entirety.
                    138:  *
                    139:  * Pool caches are layed on top of pools.  By layering them, we can avoid
                    140:  * the complexity of cache management for pools which would not benefit
                    141:  * from it.
                    142:  */
                    143:
                    144: /* The cache group pool. */
                    145: static struct pool pcgpool;
                    146:
                    147: /* The pool cache group. */
                    148: #define        PCG_NOBJECTS            16
                    149: struct pool_cache_group {
                    150:        TAILQ_ENTRY(pool_cache_group)
                    151:                pcg_list;       /* link in the pool cache's group list */
                    152:        u_int   pcg_avail;      /* # available objects */
                    153:                                /* pointers to the objects */
                    154:        void    *pcg_objects[PCG_NOBJECTS];
                    155: };
1.3       pk        156:
1.43      thorpej   157: static void    pool_cache_reclaim(struct pool_cache *);
1.3       pk        158:
1.42      thorpej   159: static int     pool_catchup(struct pool *);
1.55      thorpej   160: static void    pool_prime_page(struct pool *, caddr_t,
                    161:                    struct pool_item_header *);
1.42      thorpej   162: static void    *pool_page_alloc(unsigned long, int, int);
                    163: static void    pool_page_free(void *, unsigned long, int);
1.60.2.1! thorpej   164: #ifdef POOL_SUBPAGE
        !           165: static void    *pool_subpage_alloc(unsigned long, int, int);
        !           166: static void    pool_subpage_free(void *, unsigned long, int);
        !           167: #endif
1.3       pk        168:
1.42      thorpej   169: static void pool_print1(struct pool *, const char *,
                    170:        void (*)(const char *, ...));
1.3       pk        171:
                    172: /*
1.52      thorpej   173:  * Pool log entry. An array of these is allocated in pool_init().
1.3       pk        174:  */
                    175: struct pool_log {
                    176:        const char      *pl_file;
                    177:        long            pl_line;
                    178:        int             pl_action;
1.25      thorpej   179: #define        PRLOG_GET       1
                    180: #define        PRLOG_PUT       2
1.3       pk        181:        void            *pl_addr;
1.1       pk        182: };
                    183:
1.3       pk        184: /* Number of entries in pool log buffers */
1.17      thorpej   185: #ifndef POOL_LOGSIZE
                    186: #define        POOL_LOGSIZE    10
                    187: #endif
                    188:
                    189: int pool_logsize = POOL_LOGSIZE;
1.1       pk        190:
1.59      thorpej   191: #ifdef POOL_DIAGNOSTIC
1.42      thorpej   192: static __inline void
                    193: pr_log(struct pool *pp, void *v, int action, const char *file, long line)
1.3       pk        194: {
                    195:        int n = pp->pr_curlogentry;
                    196:        struct pool_log *pl;
                    197:
1.20      thorpej   198:        if ((pp->pr_roflags & PR_LOGGING) == 0)
1.3       pk        199:                return;
                    200:
                    201:        /*
                    202:         * Fill in the current entry. Wrap around and overwrite
                    203:         * the oldest entry if necessary.
                    204:         */
                    205:        pl = &pp->pr_log[n];
                    206:        pl->pl_file = file;
                    207:        pl->pl_line = line;
                    208:        pl->pl_action = action;
                    209:        pl->pl_addr = v;
                    210:        if (++n >= pp->pr_logsize)
                    211:                n = 0;
                    212:        pp->pr_curlogentry = n;
                    213: }
                    214:
                    215: static void
1.42      thorpej   216: pr_printlog(struct pool *pp, struct pool_item *pi,
                    217:     void (*pr)(const char *, ...))
1.3       pk        218: {
                    219:        int i = pp->pr_logsize;
                    220:        int n = pp->pr_curlogentry;
                    221:
1.20      thorpej   222:        if ((pp->pr_roflags & PR_LOGGING) == 0)
1.3       pk        223:                return;
                    224:
                    225:        /*
                    226:         * Print all entries in this pool's log.
                    227:         */
                    228:        while (i-- > 0) {
                    229:                struct pool_log *pl = &pp->pr_log[n];
                    230:                if (pl->pl_action != 0) {
1.25      thorpej   231:                        if (pi == NULL || pi == pl->pl_addr) {
                    232:                                (*pr)("\tlog entry %d:\n", i);
                    233:                                (*pr)("\t\taction = %s, addr = %p\n",
                    234:                                    pl->pl_action == PRLOG_GET ? "get" : "put",
                    235:                                    pl->pl_addr);
                    236:                                (*pr)("\t\tfile: %s at line %lu\n",
                    237:                                    pl->pl_file, pl->pl_line);
                    238:                        }
1.3       pk        239:                }
                    240:                if (++n >= pp->pr_logsize)
                    241:                        n = 0;
                    242:        }
                    243: }
1.25      thorpej   244:
1.42      thorpej   245: static __inline void
                    246: pr_enter(struct pool *pp, const char *file, long line)
1.25      thorpej   247: {
                    248:
1.34      thorpej   249:        if (__predict_false(pp->pr_entered_file != NULL)) {
1.25      thorpej   250:                printf("pool %s: reentrancy at file %s line %ld\n",
                    251:                    pp->pr_wchan, file, line);
                    252:                printf("         previous entry at file %s line %ld\n",
                    253:                    pp->pr_entered_file, pp->pr_entered_line);
                    254:                panic("pr_enter");
                    255:        }
                    256:
                    257:        pp->pr_entered_file = file;
                    258:        pp->pr_entered_line = line;
                    259: }
                    260:
1.42      thorpej   261: static __inline void
                    262: pr_leave(struct pool *pp)
1.25      thorpej   263: {
                    264:
1.34      thorpej   265:        if (__predict_false(pp->pr_entered_file == NULL)) {
1.25      thorpej   266:                printf("pool %s not entered?\n", pp->pr_wchan);
                    267:                panic("pr_leave");
                    268:        }
                    269:
                    270:        pp->pr_entered_file = NULL;
                    271:        pp->pr_entered_line = 0;
                    272: }
                    273:
1.42      thorpej   274: static __inline void
                    275: pr_enter_check(struct pool *pp, void (*pr)(const char *, ...))
1.25      thorpej   276: {
                    277:
                    278:        if (pp->pr_entered_file != NULL)
                    279:                (*pr)("\n\tcurrently entered from file %s line %ld\n",
                    280:                    pp->pr_entered_file, pp->pr_entered_line);
                    281: }
1.3       pk        282: #else
1.25      thorpej   283: #define        pr_log(pp, v, action, file, line)
                    284: #define        pr_printlog(pp, pi, pr)
                    285: #define        pr_enter(pp, file, line)
                    286: #define        pr_leave(pp)
                    287: #define        pr_enter_check(pp, pr)
1.59      thorpej   288: #endif /* POOL_DIAGNOSTIC */
1.3       pk        289:
                    290: /*
                    291:  * Return the pool page header based on page address.
                    292:  */
1.42      thorpej   293: static __inline struct pool_item_header *
                    294: pr_find_pagehead(struct pool *pp, caddr_t page)
1.3       pk        295: {
                    296:        struct pool_item_header *ph;
                    297:
1.20      thorpej   298:        if ((pp->pr_roflags & PR_PHINPAGE) != 0)
1.3       pk        299:                return ((struct pool_item_header *)(page + pp->pr_phoffset));
                    300:
                    301:        for (ph = LIST_FIRST(&pp->pr_hashtab[PR_HASH_INDEX(pp, page)]);
                    302:             ph != NULL;
                    303:             ph = LIST_NEXT(ph, ph_hashlist)) {
                    304:                if (ph->ph_page == page)
                    305:                        return (ph);
                    306:        }
                    307:        return (NULL);
                    308: }
                    309:
                    310: /*
                    311:  * Remove a page from the pool.
                    312:  */
1.42      thorpej   313: static __inline void
1.60.2.1! thorpej   314: pr_rmpage(struct pool *pp, struct pool_item_header *ph,
        !           315:      struct pool_pagelist *pq)
1.3       pk        316: {
1.60.2.1! thorpej   317:        int s;
1.3       pk        318:
                    319:        /*
1.7       thorpej   320:         * If the page was idle, decrement the idle page count.
1.3       pk        321:         */
1.6       thorpej   322:        if (ph->ph_nmissing == 0) {
                    323: #ifdef DIAGNOSTIC
                    324:                if (pp->pr_nidle == 0)
                    325:                        panic("pr_rmpage: nidle inconsistent");
1.20      thorpej   326:                if (pp->pr_nitems < pp->pr_itemsperpage)
                    327:                        panic("pr_rmpage: nitems inconsistent");
1.6       thorpej   328: #endif
                    329:                pp->pr_nidle--;
                    330:        }
1.7       thorpej   331:
1.20      thorpej   332:        pp->pr_nitems -= pp->pr_itemsperpage;
                    333:
1.7       thorpej   334:        /*
1.60.2.1! thorpej   335:         * Unlink a page from the pool and release it (or queue it for release).
1.7       thorpej   336:         */
                    337:        TAILQ_REMOVE(&pp->pr_pagelist, ph, ph_pagelist);
1.60.2.1! thorpej   338:        if (pq) {
        !           339:                TAILQ_INSERT_HEAD(pq, ph, ph_pagelist);
        !           340:        } else {
        !           341:                (*pp->pr_free)(ph->ph_page, pp->pr_pagesz, pp->pr_mtype);
        !           342:                if ((pp->pr_roflags & PR_PHINPAGE) == 0) {
        !           343:                        LIST_REMOVE(ph, ph_hashlist);
        !           344:                        s = splhigh();
        !           345:                        pool_put(&phpool, ph);
        !           346:                        splx(s);
        !           347:                }
        !           348:        }
1.7       thorpej   349:        pp->pr_npages--;
                    350:        pp->pr_npagefree++;
1.6       thorpej   351:
1.3       pk        352:        if (pp->pr_curpage == ph) {
                    353:                /*
                    354:                 * Find a new non-empty page header, if any.
                    355:                 * Start search from the page head, to increase the
                    356:                 * chance for "high water" pages to be freed.
                    357:                 */
1.60.2.1! thorpej   358:                TAILQ_FOREACH(ph, &pp->pr_pagelist, ph_pagelist)
1.3       pk        359:                        if (TAILQ_FIRST(&ph->ph_itemlist) != NULL)
                    360:                                break;
                    361:
                    362:                pp->pr_curpage = ph;
1.21      thorpej   363:        }
1.3       pk        364: }
                    365:
                    366: /*
                    367:  * Initialize the given pool resource structure.
                    368:  *
                    369:  * We export this routine to allow other kernel parts to declare
                    370:  * static pools that must be initialized before malloc() is available.
                    371:  */
                    372: void
1.42      thorpej   373: pool_init(struct pool *pp, size_t size, u_int align, u_int ioff, int flags,
                    374:     const char *wchan, size_t pagesz,
                    375:     void *(*alloc)(unsigned long, int, int),
                    376:     void (*release)(void *, unsigned long, int),
                    377:     int mtype)
1.3       pk        378: {
1.16      briggs    379:        int off, slack, i;
1.3       pk        380:
1.25      thorpej   381: #ifdef POOL_DIAGNOSTIC
                    382:        /*
                    383:         * Always log if POOL_DIAGNOSTIC is defined.
                    384:         */
                    385:        if (pool_logsize != 0)
                    386:                flags |= PR_LOGGING;
                    387: #endif
                    388:
1.3       pk        389:        /*
                    390:         * Check arguments and construct default values.
                    391:         */
1.36      pk        392:        if (!powerof2(pagesz))
1.3       pk        393:                panic("pool_init: page size invalid (%lx)\n", (u_long)pagesz);
                    394:
1.4       thorpej   395:        if (alloc == NULL && release == NULL) {
1.60.2.1! thorpej   396: #ifdef POOL_SUBPAGE
        !           397:                alloc = pool_subpage_alloc;
        !           398:                release = pool_subpage_free;
        !           399:                pagesz = POOL_SUBPAGE;
        !           400: #else
1.3       pk        401:                alloc = pool_page_alloc;
                    402:                release = pool_page_free;
1.4       thorpej   403:                pagesz = PAGE_SIZE;     /* Rounds to PAGE_SIZE anyhow. */
1.60.2.1! thorpej   404: #endif
1.4       thorpej   405:        } else if ((alloc != NULL && release != NULL) == 0) {
                    406:                /* If you specifiy one, must specify both. */
                    407:                panic("pool_init: must specify alloc and release together");
                    408:        }
1.60.2.1! thorpej   409: #ifdef POOL_SUBPAGE
        !           410:        else if (alloc == pool_page_alloc_nointr &&
        !           411:            release == pool_page_free_nointr)
        !           412:                pagesz = POOL_SUBPAGE;
        !           413: #endif
1.4       thorpej   414:
1.3       pk        415:        if (pagesz == 0)
                    416:                pagesz = PAGE_SIZE;
                    417:
                    418:        if (align == 0)
                    419:                align = ALIGN(1);
1.14      thorpej   420:
                    421:        if (size < sizeof(struct pool_item))
                    422:                size = sizeof(struct pool_item);
1.3       pk        423:
1.35      pk        424:        size = ALIGN(size);
1.43      thorpej   425:        if (size > pagesz)
1.35      pk        426:                panic("pool_init: pool item size (%lu) too large",
                    427:                      (u_long)size);
                    428:
1.3       pk        429:        /*
                    430:         * Initialize the pool structure.
                    431:         */
                    432:        TAILQ_INIT(&pp->pr_pagelist);
1.43      thorpej   433:        TAILQ_INIT(&pp->pr_cachelist);
1.3       pk        434:        pp->pr_curpage = NULL;
                    435:        pp->pr_npages = 0;
                    436:        pp->pr_minitems = 0;
                    437:        pp->pr_minpages = 0;
                    438:        pp->pr_maxpages = UINT_MAX;
1.20      thorpej   439:        pp->pr_roflags = flags;
                    440:        pp->pr_flags = 0;
1.35      pk        441:        pp->pr_size = size;
1.3       pk        442:        pp->pr_align = align;
                    443:        pp->pr_wchan = wchan;
                    444:        pp->pr_mtype = mtype;
                    445:        pp->pr_alloc = alloc;
                    446:        pp->pr_free = release;
                    447:        pp->pr_pagesz = pagesz;
                    448:        pp->pr_pagemask = ~(pagesz - 1);
                    449:        pp->pr_pageshift = ffs(pagesz) - 1;
1.20      thorpej   450:        pp->pr_nitems = 0;
                    451:        pp->pr_nout = 0;
                    452:        pp->pr_hardlimit = UINT_MAX;
                    453:        pp->pr_hardlimit_warning = NULL;
1.31      thorpej   454:        pp->pr_hardlimit_ratecap.tv_sec = 0;
                    455:        pp->pr_hardlimit_ratecap.tv_usec = 0;
                    456:        pp->pr_hardlimit_warning_last.tv_sec = 0;
                    457:        pp->pr_hardlimit_warning_last.tv_usec = 0;
1.3       pk        458:
                    459:        /*
                    460:         * Decide whether to put the page header off page to avoid
                    461:         * wasting too large a part of the page. Off-page page headers
                    462:         * go on a hash table, so we can match a returned item
                    463:         * with its header based on the page address.
                    464:         * We use 1/16 of the page size as the threshold (XXX: tune)
                    465:         */
                    466:        if (pp->pr_size < pagesz/16) {
                    467:                /* Use the end of the page for the page header */
1.20      thorpej   468:                pp->pr_roflags |= PR_PHINPAGE;
1.3       pk        469:                pp->pr_phoffset = off =
                    470:                        pagesz - ALIGN(sizeof(struct pool_item_header));
1.2       pk        471:        } else {
1.3       pk        472:                /* The page header will be taken from our page header pool */
                    473:                pp->pr_phoffset = 0;
                    474:                off = pagesz;
1.16      briggs    475:                for (i = 0; i < PR_HASHTABSIZE; i++) {
                    476:                        LIST_INIT(&pp->pr_hashtab[i]);
                    477:                }
1.2       pk        478:        }
1.1       pk        479:
1.3       pk        480:        /*
                    481:         * Alignment is to take place at `ioff' within the item. This means
                    482:         * we must reserve up to `align - 1' bytes on the page to allow
                    483:         * appropriate positioning of each item.
                    484:         *
                    485:         * Silently enforce `0 <= ioff < align'.
                    486:         */
                    487:        pp->pr_itemoffset = ioff = ioff % align;
                    488:        pp->pr_itemsperpage = (off - ((align - ioff) % align)) / pp->pr_size;
1.43      thorpej   489:        KASSERT(pp->pr_itemsperpage != 0);
1.3       pk        490:
                    491:        /*
                    492:         * Use the slack between the chunks and the page header
                    493:         * for "cache coloring".
                    494:         */
                    495:        slack = off - pp->pr_itemsperpage * pp->pr_size;
                    496:        pp->pr_maxcolor = (slack / align) * align;
                    497:        pp->pr_curcolor = 0;
                    498:
                    499:        pp->pr_nget = 0;
                    500:        pp->pr_nfail = 0;
                    501:        pp->pr_nput = 0;
                    502:        pp->pr_npagealloc = 0;
                    503:        pp->pr_npagefree = 0;
1.1       pk        504:        pp->pr_hiwat = 0;
1.8       thorpej   505:        pp->pr_nidle = 0;
1.3       pk        506:
1.59      thorpej   507: #ifdef POOL_DIAGNOSTIC
1.25      thorpej   508:        if (flags & PR_LOGGING) {
                    509:                if (kmem_map == NULL ||
                    510:                    (pp->pr_log = malloc(pool_logsize * sizeof(struct pool_log),
                    511:                     M_TEMP, M_NOWAIT)) == NULL)
1.20      thorpej   512:                        pp->pr_roflags &= ~PR_LOGGING;
1.3       pk        513:                pp->pr_curlogentry = 0;
                    514:                pp->pr_logsize = pool_logsize;
                    515:        }
1.59      thorpej   516: #endif
1.25      thorpej   517:
                    518:        pp->pr_entered_file = NULL;
                    519:        pp->pr_entered_line = 0;
1.3       pk        520:
1.21      thorpej   521:        simple_lock_init(&pp->pr_slock);
1.1       pk        522:
1.3       pk        523:        /*
1.43      thorpej   524:         * Initialize private page header pool and cache magazine pool if we
                    525:         * haven't done so yet.
1.23      thorpej   526:         * XXX LOCKING.
1.3       pk        527:         */
                    528:        if (phpool.pr_size == 0) {
1.60.2.1! thorpej   529: #ifdef POOL_SUBPAGE
        !           530:                pool_init(&phpool, sizeof(struct pool_item_header), 0, 0, 0,
        !           531:                    "phpool", PAGE_SIZE, pool_page_alloc, pool_page_free, 0);
        !           532:                pool_init(&psppool, POOL_SUBPAGE, POOL_SUBPAGE, 0,
        !           533:                    PR_RECURSIVE, "psppool", PAGE_SIZE,
        !           534:                    pool_page_alloc, pool_page_free, 0);
        !           535: #else
1.3       pk        536:                pool_init(&phpool, sizeof(struct pool_item_header), 0, 0,
1.43      thorpej   537:                    0, "phpool", 0, 0, 0, 0);
1.60.2.1! thorpej   538: #endif
1.43      thorpej   539:                pool_init(&pcgpool, sizeof(struct pool_cache_group), 0, 0,
                    540:                    0, "pcgpool", 0, 0, 0, 0);
1.1       pk        541:        }
                    542:
1.23      thorpej   543:        /* Insert into the list of all pools. */
                    544:        simple_lock(&pool_head_slock);
                    545:        TAILQ_INSERT_TAIL(&pool_head, pp, pr_poollist);
                    546:        simple_unlock(&pool_head_slock);
1.1       pk        547: }
                    548:
                    549: /*
                    550:  * De-commision a pool resource.
                    551:  */
                    552: void
1.42      thorpej   553: pool_destroy(struct pool *pp)
1.1       pk        554: {
1.3       pk        555:        struct pool_item_header *ph;
1.43      thorpej   556:        struct pool_cache *pc;
                    557:
                    558:        /* Destroy all caches for this pool. */
                    559:        while ((pc = TAILQ_FIRST(&pp->pr_cachelist)) != NULL)
                    560:                pool_cache_destroy(pc);
1.3       pk        561:
                    562: #ifdef DIAGNOSTIC
1.20      thorpej   563:        if (pp->pr_nout != 0) {
1.25      thorpej   564:                pr_printlog(pp, NULL, printf);
1.20      thorpej   565:                panic("pool_destroy: pool busy: still out: %u\n",
                    566:                    pp->pr_nout);
1.3       pk        567:        }
                    568: #endif
1.1       pk        569:
1.3       pk        570:        /* Remove all pages */
1.20      thorpej   571:        if ((pp->pr_roflags & PR_STATIC) == 0)
1.60.2.1! thorpej   572:                while ((ph = TAILQ_FIRST(&pp->pr_pagelist)) != NULL)
        !           573:                        pr_rmpage(pp, ph, NULL);
1.3       pk        574:
                    575:        /* Remove from global pool list */
1.23      thorpej   576:        simple_lock(&pool_head_slock);
1.3       pk        577:        TAILQ_REMOVE(&pool_head, pp, pr_poollist);
1.60.2.1! thorpej   578:        if (drainpp == pp) {
        !           579:                drainpp = NULL;
        !           580:        }
1.23      thorpej   581:        simple_unlock(&pool_head_slock);
1.3       pk        582:
1.59      thorpej   583: #ifdef POOL_DIAGNOSTIC
1.20      thorpej   584:        if ((pp->pr_roflags & PR_LOGGING) != 0)
1.3       pk        585:                free(pp->pr_log, M_TEMP);
1.59      thorpej   586: #endif
1.2       pk        587:
1.20      thorpej   588:        if (pp->pr_roflags & PR_FREEHEADER)
1.3       pk        589:                free(pp, M_POOL);
1.1       pk        590: }
                    591:
1.55      thorpej   592: static __inline struct pool_item_header *
                    593: pool_alloc_item_header(struct pool *pp, caddr_t storage, int flags)
                    594: {
                    595:        struct pool_item_header *ph;
                    596:        int s;
                    597:
                    598:        LOCK_ASSERT(simple_lock_held(&pp->pr_slock) == 0);
                    599:
                    600:        if ((pp->pr_roflags & PR_PHINPAGE) != 0)
                    601:                ph = (struct pool_item_header *) (storage + pp->pr_phoffset);
                    602:        else {
                    603:                s = splhigh();
                    604:                ph = pool_get(&phpool, flags);
                    605:                splx(s);
                    606:        }
                    607:
                    608:        return (ph);
                    609: }
1.1       pk        610:
                    611: /*
1.3       pk        612:  * Grab an item from the pool; must be called at appropriate spl level
1.1       pk        613:  */
1.3       pk        614: void *
1.59      thorpej   615: #ifdef POOL_DIAGNOSTIC
1.42      thorpej   616: _pool_get(struct pool *pp, int flags, const char *file, long line)
1.56      sommerfe  617: #else
                    618: pool_get(struct pool *pp, int flags)
                    619: #endif
1.1       pk        620: {
                    621:        struct pool_item *pi;
1.3       pk        622:        struct pool_item_header *ph;
1.55      thorpej   623:        void *v;
1.1       pk        624:
1.2       pk        625: #ifdef DIAGNOSTIC
1.34      thorpej   626:        if (__predict_false((pp->pr_roflags & PR_STATIC) &&
                    627:                            (flags & PR_MALLOCOK))) {
1.25      thorpej   628:                pr_printlog(pp, NULL, printf);
1.2       pk        629:                panic("pool_get: static");
1.3       pk        630:        }
1.2       pk        631:
1.37      sommerfe  632:        if (__predict_false(curproc == NULL && doing_shutdown == 0 &&
                    633:                            (flags & PR_WAITOK) != 0))
1.3       pk        634:                panic("pool_get: must have NOWAIT");
1.58      thorpej   635:
                    636: #ifdef LOCKDEBUG
                    637:        if (flags & PR_WAITOK)
                    638:                simple_lock_only_held(NULL, "pool_get(PR_WAITOK)");
1.56      sommerfe  639: #endif
1.58      thorpej   640: #endif /* DIAGNOSTIC */
1.1       pk        641:
1.21      thorpej   642:        simple_lock(&pp->pr_slock);
1.25      thorpej   643:        pr_enter(pp, file, line);
1.20      thorpej   644:
                    645:  startover:
                    646:        /*
                    647:         * Check to see if we've reached the hard limit.  If we have,
                    648:         * and we can wait, then wait until an item has been returned to
                    649:         * the pool.
                    650:         */
                    651: #ifdef DIAGNOSTIC
1.34      thorpej   652:        if (__predict_false(pp->pr_nout > pp->pr_hardlimit)) {
1.25      thorpej   653:                pr_leave(pp);
1.21      thorpej   654:                simple_unlock(&pp->pr_slock);
1.20      thorpej   655:                panic("pool_get: %s: crossed hard limit", pp->pr_wchan);
                    656:        }
                    657: #endif
1.34      thorpej   658:        if (__predict_false(pp->pr_nout == pp->pr_hardlimit)) {
1.29      sommerfe  659:                if ((flags & PR_WAITOK) && !(flags & PR_LIMITFAIL)) {
1.20      thorpej   660:                        /*
                    661:                         * XXX: A warning isn't logged in this case.  Should
                    662:                         * it be?
                    663:                         */
                    664:                        pp->pr_flags |= PR_WANTED;
1.25      thorpej   665:                        pr_leave(pp);
1.40      sommerfe  666:                        ltsleep(pp, PSWP, pp->pr_wchan, 0, &pp->pr_slock);
1.25      thorpej   667:                        pr_enter(pp, file, line);
1.20      thorpej   668:                        goto startover;
                    669:                }
1.31      thorpej   670:
                    671:                /*
                    672:                 * Log a message that the hard limit has been hit.
                    673:                 */
                    674:                if (pp->pr_hardlimit_warning != NULL &&
                    675:                    ratecheck(&pp->pr_hardlimit_warning_last,
                    676:                              &pp->pr_hardlimit_ratecap))
                    677:                        log(LOG_ERR, "%s\n", pp->pr_hardlimit_warning);
1.21      thorpej   678:
                    679:                if (flags & PR_URGENT)
                    680:                        panic("pool_get: urgent");
                    681:
                    682:                pp->pr_nfail++;
                    683:
1.25      thorpej   684:                pr_leave(pp);
1.21      thorpej   685:                simple_unlock(&pp->pr_slock);
1.20      thorpej   686:                return (NULL);
                    687:        }
                    688:
1.3       pk        689:        /*
                    690:         * The convention we use is that if `curpage' is not NULL, then
                    691:         * it points at a non-empty bucket. In particular, `curpage'
                    692:         * never points at a page header which has PR_PHINPAGE set and
                    693:         * has no items in its bucket.
                    694:         */
1.20      thorpej   695:        if ((ph = pp->pr_curpage) == NULL) {
                    696: #ifdef DIAGNOSTIC
                    697:                if (pp->pr_nitems != 0) {
1.21      thorpej   698:                        simple_unlock(&pp->pr_slock);
1.20      thorpej   699:                        printf("pool_get: %s: curpage NULL, nitems %u\n",
                    700:                            pp->pr_wchan, pp->pr_nitems);
                    701:                        panic("pool_get: nitems inconsistent\n");
                    702:                }
                    703: #endif
                    704:
1.21      thorpej   705:                /*
                    706:                 * Call the back-end page allocator for more memory.
                    707:                 * Release the pool lock, as the back-end page allocator
                    708:                 * may block.
                    709:                 */
1.25      thorpej   710:                pr_leave(pp);
1.21      thorpej   711:                simple_unlock(&pp->pr_slock);
                    712:                v = (*pp->pr_alloc)(pp->pr_pagesz, flags, pp->pr_mtype);
1.55      thorpej   713:                if (__predict_true(v != NULL))
                    714:                        ph = pool_alloc_item_header(pp, v, flags);
1.21      thorpej   715:                simple_lock(&pp->pr_slock);
1.25      thorpej   716:                pr_enter(pp, file, line);
1.15      pk        717:
1.55      thorpej   718:                if (__predict_false(v == NULL || ph == NULL)) {
                    719:                        if (v != NULL)
                    720:                                (*pp->pr_free)(v, pp->pr_pagesz, pp->pr_mtype);
                    721:
1.21      thorpej   722:                        /*
1.55      thorpej   723:                         * We were unable to allocate a page or item
                    724:                         * header, but we released the lock during
                    725:                         * allocation, so perhaps items were freed
                    726:                         * back to the pool.  Check for this case.
1.21      thorpej   727:                         */
                    728:                        if (pp->pr_curpage != NULL)
                    729:                                goto startover;
1.15      pk        730:
1.3       pk        731:                        if (flags & PR_URGENT)
                    732:                                panic("pool_get: urgent");
1.21      thorpej   733:
1.3       pk        734:                        if ((flags & PR_WAITOK) == 0) {
                    735:                                pp->pr_nfail++;
1.25      thorpej   736:                                pr_leave(pp);
1.21      thorpej   737:                                simple_unlock(&pp->pr_slock);
1.1       pk        738:                                return (NULL);
1.3       pk        739:                        }
                    740:
1.15      pk        741:                        /*
                    742:                         * Wait for items to be returned to this pool.
1.21      thorpej   743:                         *
1.15      pk        744:                         * XXX: we actually want to wait just until
                    745:                         * the page allocator has memory again. Depending
                    746:                         * on this pool's usage, we might get stuck here
                    747:                         * for a long time.
1.20      thorpej   748:                         *
                    749:                         * XXX: maybe we should wake up once a second and
                    750:                         * try again?
1.15      pk        751:                         */
1.1       pk        752:                        pp->pr_flags |= PR_WANTED;
1.25      thorpej   753:                        pr_leave(pp);
1.40      sommerfe  754:                        ltsleep(pp, PSWP, pp->pr_wchan, 0, &pp->pr_slock);
1.25      thorpej   755:                        pr_enter(pp, file, line);
1.20      thorpej   756:                        goto startover;
1.1       pk        757:                }
1.3       pk        758:
1.15      pk        759:                /* We have more memory; add it to the pool */
1.55      thorpej   760:                pool_prime_page(pp, v, ph);
1.15      pk        761:                pp->pr_npagealloc++;
                    762:
1.20      thorpej   763:                /* Start the allocation process over. */
                    764:                goto startover;
1.3       pk        765:        }
                    766:
1.34      thorpej   767:        if (__predict_false((v = pi = TAILQ_FIRST(&ph->ph_itemlist)) == NULL)) {
1.25      thorpej   768:                pr_leave(pp);
1.21      thorpej   769:                simple_unlock(&pp->pr_slock);
1.3       pk        770:                panic("pool_get: %s: page empty", pp->pr_wchan);
1.21      thorpej   771:        }
1.20      thorpej   772: #ifdef DIAGNOSTIC
1.34      thorpej   773:        if (__predict_false(pp->pr_nitems == 0)) {
1.25      thorpej   774:                pr_leave(pp);
1.21      thorpej   775:                simple_unlock(&pp->pr_slock);
1.20      thorpej   776:                printf("pool_get: %s: items on itemlist, nitems %u\n",
                    777:                    pp->pr_wchan, pp->pr_nitems);
                    778:                panic("pool_get: nitems inconsistent\n");
                    779:        }
1.60.2.1! thorpej   780: #endif
1.56      sommerfe  781:
1.60.2.1! thorpej   782: #ifdef POOL_DIAGNOSTIC
1.3       pk        783:        pr_log(pp, v, PRLOG_GET, file, line);
1.60.2.1! thorpej   784: #endif
1.3       pk        785:
1.60.2.1! thorpej   786: #ifdef DIAGNOSTIC
1.34      thorpej   787:        if (__predict_false(pi->pi_magic != PI_MAGIC)) {
1.25      thorpej   788:                pr_printlog(pp, pi, printf);
1.3       pk        789:                panic("pool_get(%s): free list modified: magic=%x; page %p;"
                    790:                       " item addr %p\n",
                    791:                        pp->pr_wchan, pi->pi_magic, ph->ph_page, pi);
                    792:        }
                    793: #endif
                    794:
                    795:        /*
                    796:         * Remove from item list.
                    797:         */
                    798:        TAILQ_REMOVE(&ph->ph_itemlist, pi, pi_list);
1.20      thorpej   799:        pp->pr_nitems--;
                    800:        pp->pr_nout++;
1.6       thorpej   801:        if (ph->ph_nmissing == 0) {
                    802: #ifdef DIAGNOSTIC
1.34      thorpej   803:                if (__predict_false(pp->pr_nidle == 0))
1.6       thorpej   804:                        panic("pool_get: nidle inconsistent");
                    805: #endif
                    806:                pp->pr_nidle--;
                    807:        }
1.3       pk        808:        ph->ph_nmissing++;
                    809:        if (TAILQ_FIRST(&ph->ph_itemlist) == NULL) {
1.21      thorpej   810: #ifdef DIAGNOSTIC
1.34      thorpej   811:                if (__predict_false(ph->ph_nmissing != pp->pr_itemsperpage)) {
1.25      thorpej   812:                        pr_leave(pp);
1.21      thorpej   813:                        simple_unlock(&pp->pr_slock);
                    814:                        panic("pool_get: %s: nmissing inconsistent",
                    815:                            pp->pr_wchan);
                    816:                }
                    817: #endif
1.3       pk        818:                /*
                    819:                 * Find a new non-empty page header, if any.
                    820:                 * Start search from the page head, to increase
                    821:                 * the chance for "high water" pages to be freed.
                    822:                 *
1.21      thorpej   823:                 * Migrate empty pages to the end of the list.  This
                    824:                 * will speed the update of curpage as pages become
                    825:                 * idle.  Empty pages intermingled with idle pages
                    826:                 * is no big deal.  As soon as a page becomes un-empty,
                    827:                 * it will move back to the head of the list.
1.3       pk        828:                 */
                    829:                TAILQ_REMOVE(&pp->pr_pagelist, ph, ph_pagelist);
1.21      thorpej   830:                TAILQ_INSERT_TAIL(&pp->pr_pagelist, ph, ph_pagelist);
1.60.2.1! thorpej   831:                TAILQ_FOREACH(ph, &pp->pr_pagelist, ph_pagelist)
1.3       pk        832:                        if (TAILQ_FIRST(&ph->ph_itemlist) != NULL)
                    833:                                break;
                    834:
                    835:                pp->pr_curpage = ph;
1.1       pk        836:        }
1.3       pk        837:
                    838:        pp->pr_nget++;
1.20      thorpej   839:
                    840:        /*
                    841:         * If we have a low water mark and we are now below that low
                    842:         * water mark, add more items to the pool.
                    843:         */
1.53      thorpej   844:        if (POOL_NEEDS_CATCHUP(pp) && pool_catchup(pp) != 0) {
1.20      thorpej   845:                /*
                    846:                 * XXX: Should we log a warning?  Should we set up a timeout
                    847:                 * to try again in a second or so?  The latter could break
                    848:                 * a caller's assumptions about interrupt protection, etc.
                    849:                 */
                    850:        }
                    851:
1.25      thorpej   852:        pr_leave(pp);
1.21      thorpej   853:        simple_unlock(&pp->pr_slock);
1.1       pk        854:        return (v);
                    855: }
                    856:
                    857: /*
1.43      thorpej   858:  * Internal version of pool_put().  Pool is already locked/entered.
1.1       pk        859:  */
1.43      thorpej   860: static void
1.56      sommerfe  861: pool_do_put(struct pool *pp, void *v)
1.1       pk        862: {
                    863:        struct pool_item *pi = v;
1.3       pk        864:        struct pool_item_header *ph;
                    865:        caddr_t page;
1.21      thorpej   866:        int s;
1.3       pk        867:
1.60.2.1! thorpej   868:        LOCK_ASSERT(simple_lock_held(&pp->pr_slock));
        !           869:
1.3       pk        870:        page = (caddr_t)((u_long)v & pp->pr_pagemask);
1.1       pk        871:
1.30      thorpej   872: #ifdef DIAGNOSTIC
1.34      thorpej   873:        if (__predict_false(pp->pr_nout == 0)) {
1.30      thorpej   874:                printf("pool %s: putting with none out\n",
                    875:                    pp->pr_wchan);
                    876:                panic("pool_put");
                    877:        }
                    878: #endif
1.3       pk        879:
1.34      thorpej   880:        if (__predict_false((ph = pr_find_pagehead(pp, page)) == NULL)) {
1.25      thorpej   881:                pr_printlog(pp, NULL, printf);
1.3       pk        882:                panic("pool_put: %s: page header missing", pp->pr_wchan);
                    883:        }
1.28      thorpej   884:
                    885: #ifdef LOCKDEBUG
                    886:        /*
                    887:         * Check if we're freeing a locked simple lock.
                    888:         */
                    889:        simple_lock_freecheck((caddr_t)pi, ((caddr_t)pi) + pp->pr_size);
                    890: #endif
1.3       pk        891:
                    892:        /*
                    893:         * Return to item list.
                    894:         */
1.2       pk        895: #ifdef DIAGNOSTIC
1.3       pk        896:        pi->pi_magic = PI_MAGIC;
                    897: #endif
1.32      chs       898: #ifdef DEBUG
                    899:        {
                    900:                int i, *ip = v;
                    901:
                    902:                for (i = 0; i < pp->pr_size / sizeof(int); i++) {
                    903:                        *ip++ = PI_MAGIC;
                    904:                }
                    905:        }
                    906: #endif
                    907:
1.3       pk        908:        TAILQ_INSERT_HEAD(&ph->ph_itemlist, pi, pi_list);
                    909:        ph->ph_nmissing--;
                    910:        pp->pr_nput++;
1.20      thorpej   911:        pp->pr_nitems++;
                    912:        pp->pr_nout--;
1.3       pk        913:
                    914:        /* Cancel "pool empty" condition if it exists */
                    915:        if (pp->pr_curpage == NULL)
                    916:                pp->pr_curpage = ph;
                    917:
                    918:        if (pp->pr_flags & PR_WANTED) {
                    919:                pp->pr_flags &= ~PR_WANTED;
1.15      pk        920:                if (ph->ph_nmissing == 0)
                    921:                        pp->pr_nidle++;
1.3       pk        922:                wakeup((caddr_t)pp);
                    923:                return;
                    924:        }
                    925:
                    926:        /*
1.21      thorpej   927:         * If this page is now complete, do one of two things:
                    928:         *
                    929:         *      (1) If we have more pages than the page high water
                    930:         *          mark, free the page back to the system.
                    931:         *
                    932:         *      (2) Move it to the end of the page list, so that
                    933:         *          we minimize our chances of fragmenting the
                    934:         *          pool.  Idle pages migrate to the end (along with
                    935:         *          completely empty pages, so that we find un-empty
                    936:         *          pages more quickly when we update curpage) of the
                    937:         *          list so they can be more easily swept up by
                    938:         *          the pagedaemon when pages are scarce.
1.3       pk        939:         */
                    940:        if (ph->ph_nmissing == 0) {
1.6       thorpej   941:                pp->pr_nidle++;
1.3       pk        942:                if (pp->pr_npages > pp->pr_maxpages) {
1.60.2.1! thorpej   943:                        pr_rmpage(pp, ph, NULL);
1.3       pk        944:                } else {
                    945:                        TAILQ_REMOVE(&pp->pr_pagelist, ph, ph_pagelist);
                    946:                        TAILQ_INSERT_TAIL(&pp->pr_pagelist, ph, ph_pagelist);
                    947:
1.21      thorpej   948:                        /*
                    949:                         * Update the timestamp on the page.  A page must
                    950:                         * be idle for some period of time before it can
                    951:                         * be reclaimed by the pagedaemon.  This minimizes
                    952:                         * ping-pong'ing for memory.
                    953:                         */
                    954:                        s = splclock();
                    955:                        ph->ph_time = mono_time;
                    956:                        splx(s);
                    957:
                    958:                        /*
                    959:                         * Update the current page pointer.  Just look for
                    960:                         * the first page with any free items.
                    961:                         *
                    962:                         * XXX: Maybe we want an option to look for the
                    963:                         * page with the fewest available items, to minimize
                    964:                         * fragmentation?
                    965:                         */
1.60.2.1! thorpej   966:                        TAILQ_FOREACH(ph, &pp->pr_pagelist, ph_pagelist)
1.3       pk        967:                                if (TAILQ_FIRST(&ph->ph_itemlist) != NULL)
                    968:                                        break;
1.1       pk        969:
1.3       pk        970:                        pp->pr_curpage = ph;
1.1       pk        971:                }
                    972:        }
1.21      thorpej   973:        /*
                    974:         * If the page has just become un-empty, move it to the head of
                    975:         * the list, and make it the current page.  The next allocation
                    976:         * will get the item from this page, instead of further fragmenting
                    977:         * the pool.
                    978:         */
                    979:        else if (ph->ph_nmissing == (pp->pr_itemsperpage - 1)) {
                    980:                TAILQ_REMOVE(&pp->pr_pagelist, ph, ph_pagelist);
                    981:                TAILQ_INSERT_HEAD(&pp->pr_pagelist, ph, ph_pagelist);
                    982:                pp->pr_curpage = ph;
                    983:        }
1.43      thorpej   984: }
                    985:
                    986: /*
                    987:  * Return resource to the pool; must be called at appropriate spl level
                    988:  */
1.59      thorpej   989: #ifdef POOL_DIAGNOSTIC
1.43      thorpej   990: void
                    991: _pool_put(struct pool *pp, void *v, const char *file, long line)
                    992: {
                    993:
                    994:        simple_lock(&pp->pr_slock);
                    995:        pr_enter(pp, file, line);
                    996:
1.56      sommerfe  997:        pr_log(pp, v, PRLOG_PUT, file, line);
                    998:
                    999:        pool_do_put(pp, v);
1.21      thorpej  1000:
1.25      thorpej  1001:        pr_leave(pp);
1.21      thorpej  1002:        simple_unlock(&pp->pr_slock);
1.1       pk       1003: }
1.57      sommerfe 1004: #undef pool_put
1.59      thorpej  1005: #endif /* POOL_DIAGNOSTIC */
1.1       pk       1006:
1.56      sommerfe 1007: void
                   1008: pool_put(struct pool *pp, void *v)
                   1009: {
                   1010:
                   1011:        simple_lock(&pp->pr_slock);
                   1012:
                   1013:        pool_do_put(pp, v);
                   1014:
                   1015:        simple_unlock(&pp->pr_slock);
                   1016: }
1.57      sommerfe 1017:
1.59      thorpej  1018: #ifdef POOL_DIAGNOSTIC
1.57      sommerfe 1019: #define                pool_put(h, v)  _pool_put((h), (v), __FILE__, __LINE__)
1.56      sommerfe 1020: #endif
                   1021:
1.1       pk       1022: /*
1.55      thorpej  1023:  * Add N items to the pool.
                   1024:  */
                   1025: int
                   1026: pool_prime(struct pool *pp, int n)
                   1027: {
                   1028:        struct pool_item_header *ph;
                   1029:        caddr_t cp;
                   1030:        int newpages, error = 0;
                   1031:
                   1032:        simple_lock(&pp->pr_slock);
                   1033:
                   1034:        newpages = roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage;
                   1035:
                   1036:        while (newpages-- > 0) {
                   1037:                simple_unlock(&pp->pr_slock);
                   1038:                cp = (*pp->pr_alloc)(pp->pr_pagesz, PR_NOWAIT, pp->pr_mtype);
                   1039:                if (__predict_true(cp != NULL))
                   1040:                        ph = pool_alloc_item_header(pp, cp, PR_NOWAIT);
                   1041:                simple_lock(&pp->pr_slock);
                   1042:
                   1043:                if (__predict_false(cp == NULL || ph == NULL)) {
                   1044:                        error = ENOMEM;
                   1045:                        if (cp != NULL)
                   1046:                                (*pp->pr_free)(cp, pp->pr_pagesz, pp->pr_mtype);
                   1047:                        break;
                   1048:                }
                   1049:
                   1050:                pool_prime_page(pp, cp, ph);
                   1051:                pp->pr_npagealloc++;
                   1052:                pp->pr_minpages++;
                   1053:        }
                   1054:
                   1055:        if (pp->pr_minpages >= pp->pr_maxpages)
                   1056:                pp->pr_maxpages = pp->pr_minpages + 1;  /* XXX */
                   1057:
                   1058:        simple_unlock(&pp->pr_slock);
                   1059:        return (0);
                   1060: }
                   1061:
                   1062: /*
1.3       pk       1063:  * Add a page worth of items to the pool.
1.21      thorpej  1064:  *
                   1065:  * Note, we must be called with the pool descriptor LOCKED.
1.3       pk       1066:  */
1.55      thorpej  1067: static void
                   1068: pool_prime_page(struct pool *pp, caddr_t storage, struct pool_item_header *ph)
1.3       pk       1069: {
                   1070:        struct pool_item *pi;
                   1071:        caddr_t cp = storage;
                   1072:        unsigned int align = pp->pr_align;
                   1073:        unsigned int ioff = pp->pr_itemoffset;
1.55      thorpej  1074:        int n;
1.36      pk       1075:
                   1076:        if (((u_long)cp & (pp->pr_pagesz - 1)) != 0)
                   1077:                panic("pool_prime_page: %s: unaligned page", pp->pr_wchan);
1.3       pk       1078:
1.55      thorpej  1079:        if ((pp->pr_roflags & PR_PHINPAGE) == 0)
1.3       pk       1080:                LIST_INSERT_HEAD(&pp->pr_hashtab[PR_HASH_INDEX(pp, cp)],
1.55      thorpej  1081:                    ph, ph_hashlist);
1.3       pk       1082:
                   1083:        /*
                   1084:         * Insert page header.
                   1085:         */
                   1086:        TAILQ_INSERT_HEAD(&pp->pr_pagelist, ph, ph_pagelist);
                   1087:        TAILQ_INIT(&ph->ph_itemlist);
                   1088:        ph->ph_page = storage;
                   1089:        ph->ph_nmissing = 0;
1.21      thorpej  1090:        memset(&ph->ph_time, 0, sizeof(ph->ph_time));
1.3       pk       1091:
1.6       thorpej  1092:        pp->pr_nidle++;
                   1093:
1.3       pk       1094:        /*
                   1095:         * Color this page.
                   1096:         */
                   1097:        cp = (caddr_t)(cp + pp->pr_curcolor);
                   1098:        if ((pp->pr_curcolor += align) > pp->pr_maxcolor)
                   1099:                pp->pr_curcolor = 0;
                   1100:
                   1101:        /*
                   1102:         * Adjust storage to apply aligment to `pr_itemoffset' in each item.
                   1103:         */
                   1104:        if (ioff != 0)
                   1105:                cp = (caddr_t)(cp + (align - ioff));
                   1106:
                   1107:        /*
                   1108:         * Insert remaining chunks on the bucket list.
                   1109:         */
                   1110:        n = pp->pr_itemsperpage;
1.20      thorpej  1111:        pp->pr_nitems += n;
1.3       pk       1112:
                   1113:        while (n--) {
                   1114:                pi = (struct pool_item *)cp;
                   1115:
                   1116:                /* Insert on page list */
                   1117:                TAILQ_INSERT_TAIL(&ph->ph_itemlist, pi, pi_list);
                   1118: #ifdef DIAGNOSTIC
                   1119:                pi->pi_magic = PI_MAGIC;
                   1120: #endif
                   1121:                cp = (caddr_t)(cp + pp->pr_size);
                   1122:        }
                   1123:
                   1124:        /*
                   1125:         * If the pool was depleted, point at the new page.
                   1126:         */
                   1127:        if (pp->pr_curpage == NULL)
                   1128:                pp->pr_curpage = ph;
                   1129:
                   1130:        if (++pp->pr_npages > pp->pr_hiwat)
                   1131:                pp->pr_hiwat = pp->pr_npages;
                   1132: }
                   1133:
1.20      thorpej  1134: /*
1.52      thorpej  1135:  * Used by pool_get() when nitems drops below the low water mark.  This
                   1136:  * is used to catch up nitmes with the low water mark.
1.20      thorpej  1137:  *
1.21      thorpej  1138:  * Note 1, we never wait for memory here, we let the caller decide what to do.
1.20      thorpej  1139:  *
                   1140:  * Note 2, this doesn't work with static pools.
                   1141:  *
                   1142:  * Note 3, we must be called with the pool already locked, and we return
                   1143:  * with it locked.
                   1144:  */
                   1145: static int
1.42      thorpej  1146: pool_catchup(struct pool *pp)
1.20      thorpej  1147: {
1.55      thorpej  1148:        struct pool_item_header *ph;
1.20      thorpej  1149:        caddr_t cp;
                   1150:        int error = 0;
                   1151:
                   1152:        if (pp->pr_roflags & PR_STATIC) {
                   1153:                /*
                   1154:                 * We dropped below the low water mark, and this is not a
                   1155:                 * good thing.  Log a warning.
1.21      thorpej  1156:                 *
                   1157:                 * XXX: rate-limit this?
1.20      thorpej  1158:                 */
                   1159:                printf("WARNING: static pool `%s' dropped below low water "
                   1160:                    "mark\n", pp->pr_wchan);
                   1161:                return (0);
                   1162:        }
                   1163:
1.54      thorpej  1164:        while (POOL_NEEDS_CATCHUP(pp)) {
1.20      thorpej  1165:                /*
1.21      thorpej  1166:                 * Call the page back-end allocator for more memory.
                   1167:                 *
                   1168:                 * XXX: We never wait, so should we bother unlocking
                   1169:                 * the pool descriptor?
1.20      thorpej  1170:                 */
1.21      thorpej  1171:                simple_unlock(&pp->pr_slock);
1.55      thorpej  1172:                cp = (*pp->pr_alloc)(pp->pr_pagesz, PR_NOWAIT, pp->pr_mtype);
                   1173:                if (__predict_true(cp != NULL))
                   1174:                        ph = pool_alloc_item_header(pp, cp, PR_NOWAIT);
1.21      thorpej  1175:                simple_lock(&pp->pr_slock);
1.55      thorpej  1176:                if (__predict_false(cp == NULL || ph == NULL)) {
                   1177:                        if (cp != NULL)
                   1178:                                (*pp->pr_free)(cp, pp->pr_pagesz, pp->pr_mtype);
1.20      thorpej  1179:                        error = ENOMEM;
                   1180:                        break;
                   1181:                }
1.55      thorpej  1182:                pool_prime_page(pp, cp, ph);
1.26      thorpej  1183:                pp->pr_npagealloc++;
1.20      thorpej  1184:        }
                   1185:
                   1186:        return (error);
                   1187: }
                   1188:
1.3       pk       1189: void
1.42      thorpej  1190: pool_setlowat(struct pool *pp, int n)
1.3       pk       1191: {
1.20      thorpej  1192:        int error;
1.15      pk       1193:
1.21      thorpej  1194:        simple_lock(&pp->pr_slock);
                   1195:
1.3       pk       1196:        pp->pr_minitems = n;
1.15      pk       1197:        pp->pr_minpages = (n == 0)
                   1198:                ? 0
1.18      thorpej  1199:                : roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage;
1.20      thorpej  1200:
                   1201:        /* Make sure we're caught up with the newly-set low water mark. */
1.53      thorpej  1202:        if (POOL_NEEDS_CATCHUP(pp) && (error = pool_catchup(pp) != 0)) {
1.20      thorpej  1203:                /*
                   1204:                 * XXX: Should we log a warning?  Should we set up a timeout
                   1205:                 * to try again in a second or so?  The latter could break
                   1206:                 * a caller's assumptions about interrupt protection, etc.
                   1207:                 */
                   1208:        }
1.21      thorpej  1209:
                   1210:        simple_unlock(&pp->pr_slock);
1.3       pk       1211: }
                   1212:
                   1213: void
1.42      thorpej  1214: pool_sethiwat(struct pool *pp, int n)
1.3       pk       1215: {
1.15      pk       1216:
1.21      thorpej  1217:        simple_lock(&pp->pr_slock);
                   1218:
1.15      pk       1219:        pp->pr_maxpages = (n == 0)
                   1220:                ? 0
1.18      thorpej  1221:                : roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage;
1.21      thorpej  1222:
                   1223:        simple_unlock(&pp->pr_slock);
1.3       pk       1224: }
                   1225:
1.20      thorpej  1226: void
1.42      thorpej  1227: pool_sethardlimit(struct pool *pp, int n, const char *warnmess, int ratecap)
1.20      thorpej  1228: {
                   1229:
1.21      thorpej  1230:        simple_lock(&pp->pr_slock);
1.20      thorpej  1231:
                   1232:        pp->pr_hardlimit = n;
                   1233:        pp->pr_hardlimit_warning = warnmess;
1.31      thorpej  1234:        pp->pr_hardlimit_ratecap.tv_sec = ratecap;
                   1235:        pp->pr_hardlimit_warning_last.tv_sec = 0;
                   1236:        pp->pr_hardlimit_warning_last.tv_usec = 0;
1.20      thorpej  1237:
                   1238:        /*
1.21      thorpej  1239:         * In-line version of pool_sethiwat(), because we don't want to
                   1240:         * release the lock.
1.20      thorpej  1241:         */
                   1242:        pp->pr_maxpages = (n == 0)
                   1243:                ? 0
                   1244:                : roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage;
1.21      thorpej  1245:
                   1246:        simple_unlock(&pp->pr_slock);
1.20      thorpej  1247: }
1.3       pk       1248:
                   1249: /*
                   1250:  * Default page allocator.
                   1251:  */
                   1252: static void *
1.42      thorpej  1253: pool_page_alloc(unsigned long sz, int flags, int mtype)
1.3       pk       1254: {
1.11      thorpej  1255:        boolean_t waitok = (flags & PR_WAITOK) ? TRUE : FALSE;
1.3       pk       1256:
1.11      thorpej  1257:        return ((void *)uvm_km_alloc_poolpage(waitok));
1.3       pk       1258: }
                   1259:
                   1260: static void
1.42      thorpej  1261: pool_page_free(void *v, unsigned long sz, int mtype)
1.3       pk       1262: {
                   1263:
1.10      eeh      1264:        uvm_km_free_poolpage((vaddr_t)v);
1.3       pk       1265: }
1.12      thorpej  1266:
1.60.2.1! thorpej  1267: #ifdef POOL_SUBPAGE
        !          1268: /*
        !          1269:  * Sub-page allocator, for machines with large hardware pages.
        !          1270:  */
        !          1271: static void *
        !          1272: pool_subpage_alloc(unsigned long sz, int flags, int mtype)
        !          1273: {
        !          1274:
        !          1275:        return pool_get(&psppool, flags);
        !          1276: }
        !          1277:
        !          1278: static void
        !          1279: pool_subpage_free(void *v, unsigned long sz, int mtype)
        !          1280: {
        !          1281:
        !          1282:        pool_put(&psppool, v);
        !          1283: }
        !          1284: #endif
        !          1285:
        !          1286: #ifdef POOL_SUBPAGE
        !          1287: /* We don't provide a real nointr allocator.  Maybe later. */
        !          1288: void *
        !          1289: pool_page_alloc_nointr(unsigned long sz, int flags, int mtype)
        !          1290: {
        !          1291:
        !          1292:        return pool_subpage_alloc(sz, flags, mtype);
        !          1293: }
        !          1294:
        !          1295: void
        !          1296: pool_page_free_nointr(void *v, unsigned long sz, int mtype)
        !          1297: {
        !          1298:
        !          1299:        pool_subpage_free(v, sz, mtype);
        !          1300: }
        !          1301: #else
1.12      thorpej  1302: /*
                   1303:  * Alternate pool page allocator for pools that know they will
                   1304:  * never be accessed in interrupt context.
                   1305:  */
                   1306: void *
1.42      thorpej  1307: pool_page_alloc_nointr(unsigned long sz, int flags, int mtype)
1.12      thorpej  1308: {
                   1309:        boolean_t waitok = (flags & PR_WAITOK) ? TRUE : FALSE;
                   1310:
                   1311:        return ((void *)uvm_km_alloc_poolpage1(kernel_map, uvm.kernel_object,
                   1312:            waitok));
                   1313: }
                   1314:
                   1315: void
1.42      thorpej  1316: pool_page_free_nointr(void *v, unsigned long sz, int mtype)
1.12      thorpej  1317: {
                   1318:
                   1319:        uvm_km_free_poolpage1(kernel_map, (vaddr_t)v);
                   1320: }
1.60.2.1! thorpej  1321: #endif
1.12      thorpej  1322:
1.3       pk       1323:
                   1324: /*
                   1325:  * Release all complete pages that have not been used recently.
                   1326:  */
                   1327: void
1.59      thorpej  1328: #ifdef POOL_DIAGNOSTIC
1.42      thorpej  1329: _pool_reclaim(struct pool *pp, const char *file, long line)
1.56      sommerfe 1330: #else
                   1331: pool_reclaim(struct pool *pp)
                   1332: #endif
1.3       pk       1333: {
                   1334:        struct pool_item_header *ph, *phnext;
1.43      thorpej  1335:        struct pool_cache *pc;
1.21      thorpej  1336:        struct timeval curtime;
1.60.2.1! thorpej  1337:        struct pool_pagelist pq;
1.21      thorpej  1338:        int s;
1.3       pk       1339:
1.20      thorpej  1340:        if (pp->pr_roflags & PR_STATIC)
1.3       pk       1341:                return;
                   1342:
1.21      thorpej  1343:        if (simple_lock_try(&pp->pr_slock) == 0)
1.3       pk       1344:                return;
1.25      thorpej  1345:        pr_enter(pp, file, line);
1.60.2.1! thorpej  1346:        TAILQ_INIT(&pq);
1.3       pk       1347:
1.43      thorpej  1348:        /*
                   1349:         * Reclaim items from the pool's caches.
                   1350:         */
1.60.2.1! thorpej  1351:        TAILQ_FOREACH(pc, &pp->pr_cachelist, pc_poollist)
1.43      thorpej  1352:                pool_cache_reclaim(pc);
                   1353:
1.21      thorpej  1354:        s = splclock();
                   1355:        curtime = mono_time;
                   1356:        splx(s);
                   1357:
1.3       pk       1358:        for (ph = TAILQ_FIRST(&pp->pr_pagelist); ph != NULL; ph = phnext) {
                   1359:                phnext = TAILQ_NEXT(ph, ph_pagelist);
                   1360:
                   1361:                /* Check our minimum page claim */
                   1362:                if (pp->pr_npages <= pp->pr_minpages)
                   1363:                        break;
                   1364:
                   1365:                if (ph->ph_nmissing == 0) {
                   1366:                        struct timeval diff;
                   1367:                        timersub(&curtime, &ph->ph_time, &diff);
                   1368:                        if (diff.tv_sec < pool_inactive_time)
                   1369:                                continue;
1.21      thorpej  1370:
                   1371:                        /*
                   1372:                         * If freeing this page would put us below
                   1373:                         * the low water mark, stop now.
                   1374:                         */
                   1375:                        if ((pp->pr_nitems - pp->pr_itemsperpage) <
                   1376:                            pp->pr_minitems)
                   1377:                                break;
                   1378:
1.60.2.1! thorpej  1379:                        pr_rmpage(pp, ph, &pq);
1.3       pk       1380:                }
                   1381:        }
                   1382:
1.25      thorpej  1383:        pr_leave(pp);
1.21      thorpej  1384:        simple_unlock(&pp->pr_slock);
1.60.2.1! thorpej  1385:        if (TAILQ_EMPTY(&pq)) {
        !          1386:                return;
        !          1387:        }
        !          1388:        while ((ph = TAILQ_FIRST(&pq)) != NULL) {
        !          1389:                TAILQ_REMOVE(&pq, ph, ph_pagelist);
        !          1390:                (*pp->pr_free)(ph->ph_page, pp->pr_pagesz, pp->pr_mtype);
        !          1391:                if (pp->pr_roflags & PR_PHINPAGE) {
        !          1392:                        continue;
        !          1393:                }
        !          1394:                LIST_REMOVE(ph, ph_hashlist);
        !          1395:                s = splhigh();
        !          1396:                pool_put(&phpool, ph);
        !          1397:                splx(s);
        !          1398:        }
1.3       pk       1399: }
                   1400:
                   1401:
                   1402: /*
                   1403:  * Drain pools, one at a time.
1.21      thorpej  1404:  *
                   1405:  * Note, we must never be called from an interrupt context.
1.3       pk       1406:  */
                   1407: void
1.42      thorpej  1408: pool_drain(void *arg)
1.3       pk       1409: {
                   1410:        struct pool *pp;
1.23      thorpej  1411:        int s;
1.3       pk       1412:
1.60.2.1! thorpej  1413:        pp = NULL;
1.49      thorpej  1414:        s = splvm();
1.23      thorpej  1415:        simple_lock(&pool_head_slock);
1.60.2.1! thorpej  1416:        if (drainpp == NULL) {
        !          1417:                drainpp = TAILQ_FIRST(&pool_head);
        !          1418:        }
        !          1419:        if (drainpp) {
        !          1420:                pp = drainpp;
        !          1421:                drainpp = TAILQ_NEXT(pp, pr_poollist);
        !          1422:        }
1.23      thorpej  1423:        simple_unlock(&pool_head_slock);
1.60.2.1! thorpej  1424:        pool_reclaim(pp);
1.3       pk       1425:        splx(s);
                   1426: }
                   1427:
                   1428:
                   1429: /*
                   1430:  * Diagnostic helpers.
                   1431:  */
                   1432: void
1.42      thorpej  1433: pool_print(struct pool *pp, const char *modif)
1.21      thorpej  1434: {
                   1435:        int s;
                   1436:
1.49      thorpej  1437:        s = splvm();
1.25      thorpej  1438:        if (simple_lock_try(&pp->pr_slock) == 0) {
                   1439:                printf("pool %s is locked; try again later\n",
                   1440:                    pp->pr_wchan);
                   1441:                splx(s);
                   1442:                return;
                   1443:        }
                   1444:        pool_print1(pp, modif, printf);
1.21      thorpej  1445:        simple_unlock(&pp->pr_slock);
                   1446:        splx(s);
                   1447: }
                   1448:
1.25      thorpej  1449: void
1.42      thorpej  1450: pool_printit(struct pool *pp, const char *modif, void (*pr)(const char *, ...))
1.25      thorpej  1451: {
                   1452:        int didlock = 0;
                   1453:
                   1454:        if (pp == NULL) {
                   1455:                (*pr)("Must specify a pool to print.\n");
                   1456:                return;
                   1457:        }
                   1458:
                   1459:        /*
                   1460:         * Called from DDB; interrupts should be blocked, and all
                   1461:         * other processors should be paused.  We can skip locking
                   1462:         * the pool in this case.
                   1463:         *
                   1464:         * We do a simple_lock_try() just to print the lock
                   1465:         * status, however.
                   1466:         */
                   1467:
                   1468:        if (simple_lock_try(&pp->pr_slock) == 0)
                   1469:                (*pr)("WARNING: pool %s is locked\n", pp->pr_wchan);
                   1470:        else
                   1471:                didlock = 1;
                   1472:
                   1473:        pool_print1(pp, modif, pr);
                   1474:
                   1475:        if (didlock)
                   1476:                simple_unlock(&pp->pr_slock);
                   1477: }
                   1478:
1.21      thorpej  1479: static void
1.42      thorpej  1480: pool_print1(struct pool *pp, const char *modif, void (*pr)(const char *, ...))
1.3       pk       1481: {
1.25      thorpej  1482:        struct pool_item_header *ph;
1.44      thorpej  1483:        struct pool_cache *pc;
                   1484:        struct pool_cache_group *pcg;
1.25      thorpej  1485: #ifdef DIAGNOSTIC
                   1486:        struct pool_item *pi;
                   1487: #endif
1.44      thorpej  1488:        int i, print_log = 0, print_pagelist = 0, print_cache = 0;
1.25      thorpej  1489:        char c;
                   1490:
                   1491:        while ((c = *modif++) != '\0') {
                   1492:                if (c == 'l')
                   1493:                        print_log = 1;
                   1494:                if (c == 'p')
                   1495:                        print_pagelist = 1;
1.44      thorpej  1496:                if (c == 'c')
                   1497:                        print_cache = 1;
1.25      thorpej  1498:                modif++;
                   1499:        }
                   1500:
                   1501:        (*pr)("POOL %s: size %u, align %u, ioff %u, roflags 0x%08x\n",
                   1502:            pp->pr_wchan, pp->pr_size, pp->pr_align, pp->pr_itemoffset,
                   1503:            pp->pr_roflags);
                   1504:        (*pr)("\tpagesz %u, mtype %d\n", pp->pr_pagesz, pp->pr_mtype);
                   1505:        (*pr)("\talloc %p, release %p\n", pp->pr_alloc, pp->pr_free);
                   1506:        (*pr)("\tminitems %u, minpages %u, maxpages %u, npages %u\n",
                   1507:            pp->pr_minitems, pp->pr_minpages, pp->pr_maxpages, pp->pr_npages);
                   1508:        (*pr)("\titemsperpage %u, nitems %u, nout %u, hardlimit %u\n",
                   1509:            pp->pr_itemsperpage, pp->pr_nitems, pp->pr_nout, pp->pr_hardlimit);
                   1510:
                   1511:        (*pr)("\n\tnget %lu, nfail %lu, nput %lu\n",
                   1512:            pp->pr_nget, pp->pr_nfail, pp->pr_nput);
                   1513:        (*pr)("\tnpagealloc %lu, npagefree %lu, hiwat %u, nidle %lu\n",
                   1514:            pp->pr_npagealloc, pp->pr_npagefree, pp->pr_hiwat, pp->pr_nidle);
                   1515:
                   1516:        if (print_pagelist == 0)
                   1517:                goto skip_pagelist;
                   1518:
                   1519:        if ((ph = TAILQ_FIRST(&pp->pr_pagelist)) != NULL)
                   1520:                (*pr)("\n\tpage list:\n");
                   1521:        for (; ph != NULL; ph = TAILQ_NEXT(ph, ph_pagelist)) {
                   1522:                (*pr)("\t\tpage %p, nmissing %d, time %lu,%lu\n",
                   1523:                    ph->ph_page, ph->ph_nmissing,
                   1524:                    (u_long)ph->ph_time.tv_sec,
                   1525:                    (u_long)ph->ph_time.tv_usec);
                   1526: #ifdef DIAGNOSTIC
1.60.2.1! thorpej  1527:                TAILQ_FOREACH(pi, &ph->ph_itemlist, pi_list) {
1.25      thorpej  1528:                        if (pi->pi_magic != PI_MAGIC) {
                   1529:                                (*pr)("\t\t\titem %p, magic 0x%x\n",
                   1530:                                    pi, pi->pi_magic);
                   1531:                        }
                   1532:                }
                   1533: #endif
                   1534:        }
                   1535:        if (pp->pr_curpage == NULL)
                   1536:                (*pr)("\tno current page\n");
                   1537:        else
                   1538:                (*pr)("\tcurpage %p\n", pp->pr_curpage->ph_page);
                   1539:
                   1540:  skip_pagelist:
                   1541:
                   1542:        if (print_log == 0)
                   1543:                goto skip_log;
                   1544:
                   1545:        (*pr)("\n");
                   1546:        if ((pp->pr_roflags & PR_LOGGING) == 0)
                   1547:                (*pr)("\tno log\n");
                   1548:        else
                   1549:                pr_printlog(pp, NULL, pr);
1.3       pk       1550:
1.25      thorpej  1551:  skip_log:
1.44      thorpej  1552:
                   1553:        if (print_cache == 0)
                   1554:                goto skip_cache;
                   1555:
1.60.2.1! thorpej  1556:        TAILQ_FOREACH(pc, &pp->pr_cachelist, pc_poollist) {
1.44      thorpej  1557:                (*pr)("\tcache %p: allocfrom %p freeto %p\n", pc,
                   1558:                    pc->pc_allocfrom, pc->pc_freeto);
1.48      thorpej  1559:                (*pr)("\t    hits %lu misses %lu ngroups %lu nitems %lu\n",
                   1560:                    pc->pc_hits, pc->pc_misses, pc->pc_ngroups, pc->pc_nitems);
1.60.2.1! thorpej  1561:                TAILQ_FOREACH(pcg, &pc->pc_grouplist, pcg_list) {
1.44      thorpej  1562:                        (*pr)("\t\tgroup %p: avail %d\n", pcg, pcg->pcg_avail);
                   1563:                        for (i = 0; i < PCG_NOBJECTS; i++)
                   1564:                                (*pr)("\t\t\t%p\n", pcg->pcg_objects[i]);
                   1565:                }
                   1566:        }
                   1567:
                   1568:  skip_cache:
1.3       pk       1569:
1.25      thorpej  1570:        pr_enter_check(pp, pr);
1.3       pk       1571: }
                   1572:
                   1573: int
1.42      thorpej  1574: pool_chk(struct pool *pp, const char *label)
1.3       pk       1575: {
                   1576:        struct pool_item_header *ph;
                   1577:        int r = 0;
                   1578:
1.21      thorpej  1579:        simple_lock(&pp->pr_slock);
1.3       pk       1580:
1.60.2.1! thorpej  1581:        TAILQ_FOREACH(ph, &pp->pr_pagelist, ph_pagelist) {
1.3       pk       1582:                struct pool_item *pi;
                   1583:                int n;
                   1584:                caddr_t page;
                   1585:
                   1586:                page = (caddr_t)((u_long)ph & pp->pr_pagemask);
1.20      thorpej  1587:                if (page != ph->ph_page &&
                   1588:                    (pp->pr_roflags & PR_PHINPAGE) != 0) {
1.3       pk       1589:                        if (label != NULL)
                   1590:                                printf("%s: ", label);
1.16      briggs   1591:                        printf("pool(%p:%s): page inconsistency: page %p;"
                   1592:                               " at page head addr %p (p %p)\n", pp,
1.3       pk       1593:                                pp->pr_wchan, ph->ph_page,
                   1594:                                ph, page);
                   1595:                        r++;
                   1596:                        goto out;
                   1597:                }
                   1598:
                   1599:                for (pi = TAILQ_FIRST(&ph->ph_itemlist), n = 0;
                   1600:                     pi != NULL;
                   1601:                     pi = TAILQ_NEXT(pi,pi_list), n++) {
                   1602:
                   1603: #ifdef DIAGNOSTIC
                   1604:                        if (pi->pi_magic != PI_MAGIC) {
                   1605:                                if (label != NULL)
                   1606:                                        printf("%s: ", label);
                   1607:                                printf("pool(%s): free list modified: magic=%x;"
                   1608:                                       " page %p; item ordinal %d;"
                   1609:                                       " addr %p (p %p)\n",
                   1610:                                        pp->pr_wchan, pi->pi_magic, ph->ph_page,
                   1611:                                        n, pi, page);
                   1612:                                panic("pool");
                   1613:                        }
                   1614: #endif
                   1615:                        page = (caddr_t)((u_long)pi & pp->pr_pagemask);
                   1616:                        if (page == ph->ph_page)
                   1617:                                continue;
                   1618:
                   1619:                        if (label != NULL)
                   1620:                                printf("%s: ", label);
1.16      briggs   1621:                        printf("pool(%p:%s): page inconsistency: page %p;"
                   1622:                               " item ordinal %d; addr %p (p %p)\n", pp,
1.3       pk       1623:                                pp->pr_wchan, ph->ph_page,
                   1624:                                n, pi, page);
                   1625:                        r++;
                   1626:                        goto out;
                   1627:                }
                   1628:        }
                   1629: out:
1.21      thorpej  1630:        simple_unlock(&pp->pr_slock);
1.3       pk       1631:        return (r);
1.43      thorpej  1632: }
                   1633:
                   1634: /*
                   1635:  * pool_cache_init:
                   1636:  *
                   1637:  *     Initialize a pool cache.
                   1638:  *
                   1639:  *     NOTE: If the pool must be protected from interrupts, we expect
                   1640:  *     to be called at the appropriate interrupt priority level.
                   1641:  */
                   1642: void
                   1643: pool_cache_init(struct pool_cache *pc, struct pool *pp,
                   1644:     int (*ctor)(void *, void *, int),
                   1645:     void (*dtor)(void *, void *),
                   1646:     void *arg)
                   1647: {
                   1648:
                   1649:        TAILQ_INIT(&pc->pc_grouplist);
                   1650:        simple_lock_init(&pc->pc_slock);
                   1651:
                   1652:        pc->pc_allocfrom = NULL;
                   1653:        pc->pc_freeto = NULL;
                   1654:        pc->pc_pool = pp;
                   1655:
                   1656:        pc->pc_ctor = ctor;
                   1657:        pc->pc_dtor = dtor;
                   1658:        pc->pc_arg  = arg;
                   1659:
1.48      thorpej  1660:        pc->pc_hits   = 0;
                   1661:        pc->pc_misses = 0;
                   1662:
                   1663:        pc->pc_ngroups = 0;
                   1664:
                   1665:        pc->pc_nitems = 0;
                   1666:
1.43      thorpej  1667:        simple_lock(&pp->pr_slock);
                   1668:        TAILQ_INSERT_TAIL(&pp->pr_cachelist, pc, pc_poollist);
                   1669:        simple_unlock(&pp->pr_slock);
                   1670: }
                   1671:
                   1672: /*
                   1673:  * pool_cache_destroy:
                   1674:  *
                   1675:  *     Destroy a pool cache.
                   1676:  */
                   1677: void
                   1678: pool_cache_destroy(struct pool_cache *pc)
                   1679: {
                   1680:        struct pool *pp = pc->pc_pool;
                   1681:
                   1682:        /* First, invalidate the entire cache. */
                   1683:        pool_cache_invalidate(pc);
                   1684:
                   1685:        /* ...and remove it from the pool's cache list. */
                   1686:        simple_lock(&pp->pr_slock);
                   1687:        TAILQ_REMOVE(&pp->pr_cachelist, pc, pc_poollist);
                   1688:        simple_unlock(&pp->pr_slock);
                   1689: }
                   1690:
                   1691: static __inline void *
                   1692: pcg_get(struct pool_cache_group *pcg)
                   1693: {
                   1694:        void *object;
                   1695:        u_int idx;
                   1696:
                   1697:        KASSERT(pcg->pcg_avail <= PCG_NOBJECTS);
1.45      thorpej  1698:        KASSERT(pcg->pcg_avail != 0);
1.43      thorpej  1699:        idx = --pcg->pcg_avail;
                   1700:
                   1701:        KASSERT(pcg->pcg_objects[idx] != NULL);
                   1702:        object = pcg->pcg_objects[idx];
                   1703:        pcg->pcg_objects[idx] = NULL;
                   1704:
                   1705:        return (object);
                   1706: }
                   1707:
                   1708: static __inline void
                   1709: pcg_put(struct pool_cache_group *pcg, void *object)
                   1710: {
                   1711:        u_int idx;
                   1712:
                   1713:        KASSERT(pcg->pcg_avail < PCG_NOBJECTS);
                   1714:        idx = pcg->pcg_avail++;
                   1715:
                   1716:        KASSERT(pcg->pcg_objects[idx] == NULL);
                   1717:        pcg->pcg_objects[idx] = object;
                   1718: }
                   1719:
                   1720: /*
                   1721:  * pool_cache_get:
                   1722:  *
                   1723:  *     Get an object from a pool cache.
                   1724:  */
                   1725: void *
                   1726: pool_cache_get(struct pool_cache *pc, int flags)
                   1727: {
                   1728:        struct pool_cache_group *pcg;
                   1729:        void *object;
1.58      thorpej  1730:
                   1731: #ifdef LOCKDEBUG
                   1732:        if (flags & PR_WAITOK)
                   1733:                simple_lock_only_held(NULL, "pool_cache_get(PR_WAITOK)");
                   1734: #endif
1.43      thorpej  1735:
                   1736:        simple_lock(&pc->pc_slock);
                   1737:
                   1738:        if ((pcg = pc->pc_allocfrom) == NULL) {
1.60.2.1! thorpej  1739:                TAILQ_FOREACH(pcg, &pc->pc_grouplist, pcg_list) {
1.43      thorpej  1740:                        if (pcg->pcg_avail != 0) {
                   1741:                                pc->pc_allocfrom = pcg;
                   1742:                                goto have_group;
                   1743:                        }
                   1744:                }
                   1745:
                   1746:                /*
                   1747:                 * No groups with any available objects.  Allocate
                   1748:                 * a new object, construct it, and return it to
                   1749:                 * the caller.  We will allocate a group, if necessary,
                   1750:                 * when the object is freed back to the cache.
                   1751:                 */
1.48      thorpej  1752:                pc->pc_misses++;
1.43      thorpej  1753:                simple_unlock(&pc->pc_slock);
                   1754:                object = pool_get(pc->pc_pool, flags);
                   1755:                if (object != NULL && pc->pc_ctor != NULL) {
                   1756:                        if ((*pc->pc_ctor)(pc->pc_arg, object, flags) != 0) {
                   1757:                                pool_put(pc->pc_pool, object);
                   1758:                                return (NULL);
                   1759:                        }
                   1760:                }
                   1761:                return (object);
                   1762:        }
                   1763:
                   1764:  have_group:
1.48      thorpej  1765:        pc->pc_hits++;
                   1766:        pc->pc_nitems--;
1.43      thorpej  1767:        object = pcg_get(pcg);
                   1768:
                   1769:        if (pcg->pcg_avail == 0)
                   1770:                pc->pc_allocfrom = NULL;
1.45      thorpej  1771:
1.43      thorpej  1772:        simple_unlock(&pc->pc_slock);
                   1773:
                   1774:        return (object);
                   1775: }
                   1776:
                   1777: /*
                   1778:  * pool_cache_put:
                   1779:  *
                   1780:  *     Put an object back to the pool cache.
                   1781:  */
                   1782: void
                   1783: pool_cache_put(struct pool_cache *pc, void *object)
                   1784: {
                   1785:        struct pool_cache_group *pcg;
1.60      thorpej  1786:        int s;
1.43      thorpej  1787:
                   1788:        simple_lock(&pc->pc_slock);
                   1789:
                   1790:        if ((pcg = pc->pc_freeto) == NULL) {
1.60.2.1! thorpej  1791:                TAILQ_FOREACH(pcg, &pc->pc_grouplist, pcg_list) {
1.43      thorpej  1792:                        if (pcg->pcg_avail != PCG_NOBJECTS) {
                   1793:                                pc->pc_freeto = pcg;
                   1794:                                goto have_group;
                   1795:                        }
                   1796:                }
                   1797:
                   1798:                /*
                   1799:                 * No empty groups to free the object to.  Attempt to
1.47      thorpej  1800:                 * allocate one.
1.43      thorpej  1801:                 */
1.47      thorpej  1802:                simple_unlock(&pc->pc_slock);
1.60      thorpej  1803:                s = splvm();
1.43      thorpej  1804:                pcg = pool_get(&pcgpool, PR_NOWAIT);
1.60      thorpej  1805:                splx(s);
1.43      thorpej  1806:                if (pcg != NULL) {
                   1807:                        memset(pcg, 0, sizeof(*pcg));
1.47      thorpej  1808:                        simple_lock(&pc->pc_slock);
1.48      thorpej  1809:                        pc->pc_ngroups++;
1.43      thorpej  1810:                        TAILQ_INSERT_TAIL(&pc->pc_grouplist, pcg, pcg_list);
1.47      thorpej  1811:                        if (pc->pc_freeto == NULL)
                   1812:                                pc->pc_freeto = pcg;
1.43      thorpej  1813:                        goto have_group;
                   1814:                }
                   1815:
                   1816:                /*
                   1817:                 * Unable to allocate a cache group; destruct the object
                   1818:                 * and free it back to the pool.
                   1819:                 */
1.51      thorpej  1820:                pool_cache_destruct_object(pc, object);
1.43      thorpej  1821:                return;
                   1822:        }
                   1823:
                   1824:  have_group:
1.48      thorpej  1825:        pc->pc_nitems++;
1.43      thorpej  1826:        pcg_put(pcg, object);
                   1827:
                   1828:        if (pcg->pcg_avail == PCG_NOBJECTS)
                   1829:                pc->pc_freeto = NULL;
                   1830:
                   1831:        simple_unlock(&pc->pc_slock);
1.51      thorpej  1832: }
                   1833:
                   1834: /*
                   1835:  * pool_cache_destruct_object:
                   1836:  *
                   1837:  *     Force destruction of an object and its release back into
                   1838:  *     the pool.
                   1839:  */
                   1840: void
                   1841: pool_cache_destruct_object(struct pool_cache *pc, void *object)
                   1842: {
                   1843:
                   1844:        if (pc->pc_dtor != NULL)
                   1845:                (*pc->pc_dtor)(pc->pc_arg, object);
                   1846:        pool_put(pc->pc_pool, object);
1.43      thorpej  1847: }
                   1848:
                   1849: /*
                   1850:  * pool_cache_do_invalidate:
                   1851:  *
                   1852:  *     This internal function implements pool_cache_invalidate() and
                   1853:  *     pool_cache_reclaim().
                   1854:  */
                   1855: static void
                   1856: pool_cache_do_invalidate(struct pool_cache *pc, int free_groups,
1.56      sommerfe 1857:     void (*putit)(struct pool *, void *))
1.43      thorpej  1858: {
                   1859:        struct pool_cache_group *pcg, *npcg;
                   1860:        void *object;
1.60      thorpej  1861:        int s;
1.43      thorpej  1862:
                   1863:        for (pcg = TAILQ_FIRST(&pc->pc_grouplist); pcg != NULL;
                   1864:             pcg = npcg) {
                   1865:                npcg = TAILQ_NEXT(pcg, pcg_list);
                   1866:                while (pcg->pcg_avail != 0) {
1.48      thorpej  1867:                        pc->pc_nitems--;
1.43      thorpej  1868:                        object = pcg_get(pcg);
1.45      thorpej  1869:                        if (pcg->pcg_avail == 0 && pc->pc_allocfrom == pcg)
                   1870:                                pc->pc_allocfrom = NULL;
1.43      thorpej  1871:                        if (pc->pc_dtor != NULL)
                   1872:                                (*pc->pc_dtor)(pc->pc_arg, object);
1.56      sommerfe 1873:                        (*putit)(pc->pc_pool, object);
1.43      thorpej  1874:                }
                   1875:                if (free_groups) {
1.48      thorpej  1876:                        pc->pc_ngroups--;
1.43      thorpej  1877:                        TAILQ_REMOVE(&pc->pc_grouplist, pcg, pcg_list);
1.46      thorpej  1878:                        if (pc->pc_freeto == pcg)
                   1879:                                pc->pc_freeto = NULL;
1.60      thorpej  1880:                        s = splvm();
1.43      thorpej  1881:                        pool_put(&pcgpool, pcg);
1.60      thorpej  1882:                        splx(s);
1.43      thorpej  1883:                }
                   1884:        }
                   1885: }
                   1886:
                   1887: /*
                   1888:  * pool_cache_invalidate:
                   1889:  *
                   1890:  *     Invalidate a pool cache (destruct and release all of the
                   1891:  *     cached objects).
                   1892:  */
                   1893: void
                   1894: pool_cache_invalidate(struct pool_cache *pc)
                   1895: {
                   1896:
                   1897:        simple_lock(&pc->pc_slock);
1.56      sommerfe 1898:        pool_cache_do_invalidate(pc, 0, pool_put);
1.43      thorpej  1899:        simple_unlock(&pc->pc_slock);
                   1900: }
                   1901:
                   1902: /*
                   1903:  * pool_cache_reclaim:
                   1904:  *
                   1905:  *     Reclaim a pool cache for pool_reclaim().
                   1906:  */
                   1907: static void
                   1908: pool_cache_reclaim(struct pool_cache *pc)
                   1909: {
                   1910:
1.47      thorpej  1911:        simple_lock(&pc->pc_slock);
1.43      thorpej  1912:        pool_cache_do_invalidate(pc, 1, pool_do_put);
                   1913:        simple_unlock(&pc->pc_slock);
1.3       pk       1914: }

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