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Annotation of src/sys/kern/subr_pool.c, Revision 1.34.2.1

1.34.2.1! minoura     1: /*     $NetBSD: subr_pool.c,v 1.37 2000/06/10 18:44:44 sommerfeld Exp $        */
1.1       pk          2:
                      3: /*-
1.20      thorpej     4:  * Copyright (c) 1997, 1999 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:
1.25      thorpej    40: #include "opt_pool.h"
1.24      scottr     41: #include "opt_poollog.h"
1.28      thorpej    42: #include "opt_lockdebug.h"
1.1       pk         43:
                     44: #include <sys/param.h>
                     45: #include <sys/systm.h>
                     46: #include <sys/proc.h>
                     47: #include <sys/errno.h>
                     48: #include <sys/kernel.h>
                     49: #include <sys/malloc.h>
                     50: #include <sys/lock.h>
                     51: #include <sys/pool.h>
1.20      thorpej    52: #include <sys/syslog.h>
1.1       pk         53:
1.3       pk         54: #include <vm/vm.h>
                     55: #include <vm/vm_kern.h>
                     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:
                     76: /* # of seconds to retain page after last use */
                     77: int pool_inactive_time = 10;
                     78:
                     79: /* Next candidate for drainage (see pool_drain()) */
1.23      thorpej    80: static struct pool     *drainpp;
                     81:
                     82: /* This spin lock protects both pool_head and drainpp. */
                     83: struct simplelock pool_head_slock = SIMPLELOCK_INITIALIZER;
1.3       pk         84:
                     85: struct pool_item_header {
                     86:        /* Page headers */
                     87:        TAILQ_ENTRY(pool_item_header)
                     88:                                ph_pagelist;    /* pool page list */
                     89:        TAILQ_HEAD(,pool_item)  ph_itemlist;    /* chunk list for this page */
                     90:        LIST_ENTRY(pool_item_header)
                     91:                                ph_hashlist;    /* Off-page page headers */
                     92:        int                     ph_nmissing;    /* # of chunks in use */
                     93:        caddr_t                 ph_page;        /* this page's address */
                     94:        struct timeval          ph_time;        /* last referenced */
                     95: };
                     96:
1.1       pk         97: struct pool_item {
1.3       pk         98: #ifdef DIAGNOSTIC
                     99:        int pi_magic;
1.33      chs       100: #endif
1.25      thorpej   101: #define        PI_MAGIC 0xdeadbeef
1.3       pk        102:        /* Other entries use only this list entry */
                    103:        TAILQ_ENTRY(pool_item)  pi_list;
                    104: };
                    105:
                    106:
1.25      thorpej   107: #define        PR_HASH_INDEX(pp,addr) \
1.3       pk        108:        (((u_long)(addr) >> (pp)->pr_pageshift) & (PR_HASHTABSIZE - 1))
                    109:
                    110:
                    111:
                    112: static struct pool_item_header
                    113:                *pr_find_pagehead __P((struct pool *, caddr_t));
                    114: static void    pr_rmpage __P((struct pool *, struct pool_item_header *));
1.20      thorpej   115: static int     pool_catchup __P((struct pool *));
1.21      thorpej   116: static void    pool_prime_page __P((struct pool *, caddr_t));
1.3       pk        117: static void    *pool_page_alloc __P((unsigned long, int, int));
                    118: static void    pool_page_free __P((void *, unsigned long, int));
                    119:
1.25      thorpej   120: static void pool_print1 __P((struct pool *, const char *,
                    121:        void (*)(const char *, ...)));
1.3       pk        122:
                    123: /*
                    124:  * Pool log entry. An array of these is allocated in pool_create().
                    125:  */
                    126: struct pool_log {
                    127:        const char      *pl_file;
                    128:        long            pl_line;
                    129:        int             pl_action;
1.25      thorpej   130: #define        PRLOG_GET       1
                    131: #define        PRLOG_PUT       2
1.3       pk        132:        void            *pl_addr;
1.1       pk        133: };
                    134:
1.3       pk        135: /* Number of entries in pool log buffers */
1.17      thorpej   136: #ifndef POOL_LOGSIZE
                    137: #define        POOL_LOGSIZE    10
                    138: #endif
                    139:
                    140: int pool_logsize = POOL_LOGSIZE;
1.1       pk        141:
1.25      thorpej   142: #ifdef DIAGNOSTIC
1.3       pk        143: static void    pr_log __P((struct pool *, void *, int, const char *, long));
1.25      thorpej   144: static void    pr_printlog __P((struct pool *, struct pool_item *,
                    145:                    void (*)(const char *, ...)));
                    146: static void    pr_enter __P((struct pool *, const char *, long));
                    147: static void    pr_leave __P((struct pool *));
                    148: static void    pr_enter_check __P((struct pool *,
                    149:                    void (*)(const char *, ...)));
1.3       pk        150:
                    151: static __inline__ void
                    152: pr_log(pp, v, action, file, line)
                    153:        struct pool     *pp;
                    154:        void            *v;
                    155:        int             action;
                    156:        const char      *file;
                    157:        long            line;
                    158: {
                    159:        int n = pp->pr_curlogentry;
                    160:        struct pool_log *pl;
                    161:
1.20      thorpej   162:        if ((pp->pr_roflags & PR_LOGGING) == 0)
1.3       pk        163:                return;
                    164:
                    165:        /*
                    166:         * Fill in the current entry. Wrap around and overwrite
                    167:         * the oldest entry if necessary.
                    168:         */
                    169:        pl = &pp->pr_log[n];
                    170:        pl->pl_file = file;
                    171:        pl->pl_line = line;
                    172:        pl->pl_action = action;
                    173:        pl->pl_addr = v;
                    174:        if (++n >= pp->pr_logsize)
                    175:                n = 0;
                    176:        pp->pr_curlogentry = n;
                    177: }
                    178:
                    179: static void
1.25      thorpej   180: pr_printlog(pp, pi, pr)
1.3       pk        181:        struct pool *pp;
1.25      thorpej   182:        struct pool_item *pi;
                    183:        void (*pr) __P((const char *, ...));
1.3       pk        184: {
                    185:        int i = pp->pr_logsize;
                    186:        int n = pp->pr_curlogentry;
                    187:
1.20      thorpej   188:        if ((pp->pr_roflags & PR_LOGGING) == 0)
1.3       pk        189:                return;
                    190:
                    191:        /*
                    192:         * Print all entries in this pool's log.
                    193:         */
                    194:        while (i-- > 0) {
                    195:                struct pool_log *pl = &pp->pr_log[n];
                    196:                if (pl->pl_action != 0) {
1.25      thorpej   197:                        if (pi == NULL || pi == pl->pl_addr) {
                    198:                                (*pr)("\tlog entry %d:\n", i);
                    199:                                (*pr)("\t\taction = %s, addr = %p\n",
                    200:                                    pl->pl_action == PRLOG_GET ? "get" : "put",
                    201:                                    pl->pl_addr);
                    202:                                (*pr)("\t\tfile: %s at line %lu\n",
                    203:                                    pl->pl_file, pl->pl_line);
                    204:                        }
1.3       pk        205:                }
                    206:                if (++n >= pp->pr_logsize)
                    207:                        n = 0;
                    208:        }
                    209: }
1.25      thorpej   210:
                    211: static __inline__ void
                    212: pr_enter(pp, file, line)
                    213:        struct pool *pp;
                    214:        const char *file;
                    215:        long line;
                    216: {
                    217:
1.34      thorpej   218:        if (__predict_false(pp->pr_entered_file != NULL)) {
1.25      thorpej   219:                printf("pool %s: reentrancy at file %s line %ld\n",
                    220:                    pp->pr_wchan, file, line);
                    221:                printf("         previous entry at file %s line %ld\n",
                    222:                    pp->pr_entered_file, pp->pr_entered_line);
                    223:                panic("pr_enter");
                    224:        }
                    225:
                    226:        pp->pr_entered_file = file;
                    227:        pp->pr_entered_line = line;
                    228: }
                    229:
                    230: static __inline__ void
                    231: pr_leave(pp)
                    232:        struct pool *pp;
                    233: {
                    234:
1.34      thorpej   235:        if (__predict_false(pp->pr_entered_file == NULL)) {
1.25      thorpej   236:                printf("pool %s not entered?\n", pp->pr_wchan);
                    237:                panic("pr_leave");
                    238:        }
                    239:
                    240:        pp->pr_entered_file = NULL;
                    241:        pp->pr_entered_line = 0;
                    242: }
                    243:
                    244: static __inline__ void
                    245: pr_enter_check(pp, pr)
                    246:        struct pool *pp;
                    247:        void (*pr) __P((const char *, ...));
                    248: {
                    249:
                    250:        if (pp->pr_entered_file != NULL)
                    251:                (*pr)("\n\tcurrently entered from file %s line %ld\n",
                    252:                    pp->pr_entered_file, pp->pr_entered_line);
                    253: }
1.3       pk        254: #else
1.25      thorpej   255: #define        pr_log(pp, v, action, file, line)
                    256: #define        pr_printlog(pp, pi, pr)
                    257: #define        pr_enter(pp, file, line)
                    258: #define        pr_leave(pp)
                    259: #define        pr_enter_check(pp, pr)
                    260: #endif /* DIAGNOSTIC */
1.3       pk        261:
                    262: /*
                    263:  * Return the pool page header based on page address.
                    264:  */
                    265: static __inline__ struct pool_item_header *
                    266: pr_find_pagehead(pp, page)
                    267:        struct pool *pp;
                    268:        caddr_t page;
                    269: {
                    270:        struct pool_item_header *ph;
                    271:
1.20      thorpej   272:        if ((pp->pr_roflags & PR_PHINPAGE) != 0)
1.3       pk        273:                return ((struct pool_item_header *)(page + pp->pr_phoffset));
                    274:
                    275:        for (ph = LIST_FIRST(&pp->pr_hashtab[PR_HASH_INDEX(pp, page)]);
                    276:             ph != NULL;
                    277:             ph = LIST_NEXT(ph, ph_hashlist)) {
                    278:                if (ph->ph_page == page)
                    279:                        return (ph);
                    280:        }
                    281:        return (NULL);
                    282: }
                    283:
                    284: /*
                    285:  * Remove a page from the pool.
                    286:  */
                    287: static __inline__ void
                    288: pr_rmpage(pp, ph)
                    289:        struct pool *pp;
                    290:        struct pool_item_header *ph;
                    291: {
                    292:
                    293:        /*
1.7       thorpej   294:         * If the page was idle, decrement the idle page count.
1.3       pk        295:         */
1.6       thorpej   296:        if (ph->ph_nmissing == 0) {
                    297: #ifdef DIAGNOSTIC
                    298:                if (pp->pr_nidle == 0)
                    299:                        panic("pr_rmpage: nidle inconsistent");
1.20      thorpej   300:                if (pp->pr_nitems < pp->pr_itemsperpage)
                    301:                        panic("pr_rmpage: nitems inconsistent");
1.6       thorpej   302: #endif
                    303:                pp->pr_nidle--;
                    304:        }
1.7       thorpej   305:
1.20      thorpej   306:        pp->pr_nitems -= pp->pr_itemsperpage;
                    307:
1.7       thorpej   308:        /*
                    309:         * Unlink a page from the pool and release it.
                    310:         */
                    311:        TAILQ_REMOVE(&pp->pr_pagelist, ph, ph_pagelist);
                    312:        (*pp->pr_free)(ph->ph_page, pp->pr_pagesz, pp->pr_mtype);
                    313:        pp->pr_npages--;
                    314:        pp->pr_npagefree++;
1.6       thorpej   315:
1.22      chs       316:        if ((pp->pr_roflags & PR_PHINPAGE) == 0) {
1.27      pk        317:                int s;
1.22      chs       318:                LIST_REMOVE(ph, ph_hashlist);
1.27      pk        319:                s = splhigh();
1.22      chs       320:                pool_put(&phpool, ph);
1.27      pk        321:                splx(s);
1.22      chs       322:        }
                    323:
1.3       pk        324:        if (pp->pr_curpage == ph) {
                    325:                /*
                    326:                 * Find a new non-empty page header, if any.
                    327:                 * Start search from the page head, to increase the
                    328:                 * chance for "high water" pages to be freed.
                    329:                 */
                    330:                for (ph = TAILQ_FIRST(&pp->pr_pagelist); ph != NULL;
                    331:                     ph = TAILQ_NEXT(ph, ph_pagelist))
                    332:                        if (TAILQ_FIRST(&ph->ph_itemlist) != NULL)
                    333:                                break;
                    334:
                    335:                pp->pr_curpage = ph;
1.21      thorpej   336:        }
1.3       pk        337: }
                    338:
                    339: /*
                    340:  * Allocate and initialize a pool.
                    341:  */
1.1       pk        342: struct pool *
1.3       pk        343: pool_create(size, align, ioff, nitems, wchan, pagesz, alloc, release, mtype)
1.1       pk        344:        size_t  size;
1.3       pk        345:        u_int   align;
                    346:        u_int   ioff;
1.1       pk        347:        int     nitems;
1.21      thorpej   348:        const char *wchan;
1.3       pk        349:        size_t  pagesz;
                    350:        void    *(*alloc) __P((unsigned long, int, int));
                    351:        void    (*release) __P((void *, unsigned long, int));
1.1       pk        352:        int     mtype;
                    353: {
                    354:        struct pool *pp;
1.3       pk        355:        int flags;
1.1       pk        356:
1.3       pk        357:        pp = (struct pool *)malloc(sizeof(*pp), M_POOL, M_NOWAIT);
                    358:        if (pp == NULL)
1.1       pk        359:                return (NULL);
1.3       pk        360:
                    361:        flags = PR_FREEHEADER;
                    362:        pool_init(pp, size, align, ioff, flags, wchan, pagesz,
                    363:                  alloc, release, mtype);
                    364:
                    365:        if (nitems != 0) {
                    366:                if (pool_prime(pp, nitems, NULL) != 0) {
                    367:                        pool_destroy(pp);
                    368:                        return (NULL);
                    369:                }
1.1       pk        370:        }
                    371:
1.3       pk        372:        return (pp);
                    373: }
                    374:
                    375: /*
                    376:  * Initialize the given pool resource structure.
                    377:  *
                    378:  * We export this routine to allow other kernel parts to declare
                    379:  * static pools that must be initialized before malloc() is available.
                    380:  */
                    381: void
                    382: pool_init(pp, size, align, ioff, flags, wchan, pagesz, alloc, release, mtype)
                    383:        struct pool     *pp;
                    384:        size_t          size;
                    385:        u_int           align;
                    386:        u_int           ioff;
                    387:        int             flags;
1.21      thorpej   388:        const char      *wchan;
1.3       pk        389:        size_t          pagesz;
                    390:        void            *(*alloc) __P((unsigned long, int, int));
                    391:        void            (*release) __P((void *, unsigned long, int));
                    392:        int             mtype;
                    393: {
1.16      briggs    394:        int off, slack, i;
1.3       pk        395:
1.25      thorpej   396: #ifdef POOL_DIAGNOSTIC
                    397:        /*
                    398:         * Always log if POOL_DIAGNOSTIC is defined.
                    399:         */
                    400:        if (pool_logsize != 0)
                    401:                flags |= PR_LOGGING;
                    402: #endif
                    403:
1.3       pk        404:        /*
                    405:         * Check arguments and construct default values.
                    406:         */
1.34.2.1! minoura   407:        if (!powerof2(pagesz))
1.3       pk        408:                panic("pool_init: page size invalid (%lx)\n", (u_long)pagesz);
                    409:
1.4       thorpej   410:        if (alloc == NULL && release == NULL) {
1.3       pk        411:                alloc = pool_page_alloc;
                    412:                release = pool_page_free;
1.4       thorpej   413:                pagesz = PAGE_SIZE;     /* Rounds to PAGE_SIZE anyhow. */
                    414:        } else if ((alloc != NULL && release != NULL) == 0) {
                    415:                /* If you specifiy one, must specify both. */
                    416:                panic("pool_init: must specify alloc and release together");
                    417:        }
                    418:
1.3       pk        419:        if (pagesz == 0)
                    420:                pagesz = PAGE_SIZE;
                    421:
                    422:        if (align == 0)
                    423:                align = ALIGN(1);
1.14      thorpej   424:
                    425:        if (size < sizeof(struct pool_item))
                    426:                size = sizeof(struct pool_item);
1.3       pk        427:
1.34.2.1! minoura   428:        size = ALIGN(size);
        !           429:        if (size >= pagesz)
        !           430:                panic("pool_init: pool item size (%lu) too large",
        !           431:                      (u_long)size);
        !           432:
1.3       pk        433:        /*
                    434:         * Initialize the pool structure.
                    435:         */
                    436:        TAILQ_INIT(&pp->pr_pagelist);
                    437:        pp->pr_curpage = NULL;
                    438:        pp->pr_npages = 0;
                    439:        pp->pr_minitems = 0;
                    440:        pp->pr_minpages = 0;
                    441:        pp->pr_maxpages = UINT_MAX;
1.20      thorpej   442:        pp->pr_roflags = flags;
                    443:        pp->pr_flags = 0;
1.34.2.1! minoura   444:        pp->pr_size = size;
1.3       pk        445:        pp->pr_align = align;
                    446:        pp->pr_wchan = wchan;
                    447:        pp->pr_mtype = mtype;
                    448:        pp->pr_alloc = alloc;
                    449:        pp->pr_free = release;
                    450:        pp->pr_pagesz = pagesz;
                    451:        pp->pr_pagemask = ~(pagesz - 1);
                    452:        pp->pr_pageshift = ffs(pagesz) - 1;
1.20      thorpej   453:        pp->pr_nitems = 0;
                    454:        pp->pr_nout = 0;
                    455:        pp->pr_hardlimit = UINT_MAX;
                    456:        pp->pr_hardlimit_warning = NULL;
1.31      thorpej   457:        pp->pr_hardlimit_ratecap.tv_sec = 0;
                    458:        pp->pr_hardlimit_ratecap.tv_usec = 0;
                    459:        pp->pr_hardlimit_warning_last.tv_sec = 0;
                    460:        pp->pr_hardlimit_warning_last.tv_usec = 0;
1.3       pk        461:
                    462:        /*
                    463:         * Decide whether to put the page header off page to avoid
                    464:         * wasting too large a part of the page. Off-page page headers
                    465:         * go on a hash table, so we can match a returned item
                    466:         * with its header based on the page address.
                    467:         * We use 1/16 of the page size as the threshold (XXX: tune)
                    468:         */
                    469:        if (pp->pr_size < pagesz/16) {
                    470:                /* Use the end of the page for the page header */
1.20      thorpej   471:                pp->pr_roflags |= PR_PHINPAGE;
1.3       pk        472:                pp->pr_phoffset = off =
                    473:                        pagesz - ALIGN(sizeof(struct pool_item_header));
1.2       pk        474:        } else {
1.3       pk        475:                /* The page header will be taken from our page header pool */
                    476:                pp->pr_phoffset = 0;
                    477:                off = pagesz;
1.16      briggs    478:                for (i = 0; i < PR_HASHTABSIZE; i++) {
                    479:                        LIST_INIT(&pp->pr_hashtab[i]);
                    480:                }
1.2       pk        481:        }
1.1       pk        482:
1.3       pk        483:        /*
                    484:         * Alignment is to take place at `ioff' within the item. This means
                    485:         * we must reserve up to `align - 1' bytes on the page to allow
                    486:         * appropriate positioning of each item.
                    487:         *
                    488:         * Silently enforce `0 <= ioff < align'.
                    489:         */
                    490:        pp->pr_itemoffset = ioff = ioff % align;
                    491:        pp->pr_itemsperpage = (off - ((align - ioff) % align)) / pp->pr_size;
                    492:
                    493:        /*
                    494:         * Use the slack between the chunks and the page header
                    495:         * for "cache coloring".
                    496:         */
                    497:        slack = off - pp->pr_itemsperpage * pp->pr_size;
                    498:        pp->pr_maxcolor = (slack / align) * align;
                    499:        pp->pr_curcolor = 0;
                    500:
                    501:        pp->pr_nget = 0;
                    502:        pp->pr_nfail = 0;
                    503:        pp->pr_nput = 0;
                    504:        pp->pr_npagealloc = 0;
                    505:        pp->pr_npagefree = 0;
1.1       pk        506:        pp->pr_hiwat = 0;
1.8       thorpej   507:        pp->pr_nidle = 0;
1.3       pk        508:
1.25      thorpej   509:        if (flags & PR_LOGGING) {
                    510:                if (kmem_map == NULL ||
                    511:                    (pp->pr_log = malloc(pool_logsize * sizeof(struct pool_log),
                    512:                     M_TEMP, M_NOWAIT)) == NULL)
1.20      thorpej   513:                        pp->pr_roflags &= ~PR_LOGGING;
1.3       pk        514:                pp->pr_curlogentry = 0;
                    515:                pp->pr_logsize = pool_logsize;
                    516:        }
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:        /*
                    524:         * Initialize private page header pool if we haven't done so yet.
1.23      thorpej   525:         * XXX LOCKING.
1.3       pk        526:         */
                    527:        if (phpool.pr_size == 0) {
                    528:                pool_init(&phpool, sizeof(struct pool_item_header), 0, 0,
                    529:                          0, "phpool", 0, 0, 0, 0);
1.1       pk        530:        }
                    531:
1.23      thorpej   532:        /* Insert into the list of all pools. */
                    533:        simple_lock(&pool_head_slock);
                    534:        TAILQ_INSERT_TAIL(&pool_head, pp, pr_poollist);
                    535:        simple_unlock(&pool_head_slock);
1.1       pk        536: }
                    537:
                    538: /*
                    539:  * De-commision a pool resource.
                    540:  */
                    541: void
                    542: pool_destroy(pp)
                    543:        struct pool *pp;
                    544: {
1.3       pk        545:        struct pool_item_header *ph;
                    546:
                    547: #ifdef DIAGNOSTIC
1.20      thorpej   548:        if (pp->pr_nout != 0) {
1.25      thorpej   549:                pr_printlog(pp, NULL, printf);
1.20      thorpej   550:                panic("pool_destroy: pool busy: still out: %u\n",
                    551:                    pp->pr_nout);
1.3       pk        552:        }
                    553: #endif
1.1       pk        554:
1.3       pk        555:        /* Remove all pages */
1.20      thorpej   556:        if ((pp->pr_roflags & PR_STATIC) == 0)
1.3       pk        557:                while ((ph = pp->pr_pagelist.tqh_first) != NULL)
                    558:                        pr_rmpage(pp, ph);
                    559:
                    560:        /* Remove from global pool list */
1.23      thorpej   561:        simple_lock(&pool_head_slock);
1.3       pk        562:        TAILQ_REMOVE(&pool_head, pp, pr_poollist);
1.23      thorpej   563:        /* XXX Only clear this if we were drainpp? */
1.3       pk        564:        drainpp = NULL;
1.23      thorpej   565:        simple_unlock(&pool_head_slock);
1.3       pk        566:
1.20      thorpej   567:        if ((pp->pr_roflags & PR_LOGGING) != 0)
1.3       pk        568:                free(pp->pr_log, M_TEMP);
1.2       pk        569:
1.20      thorpej   570:        if (pp->pr_roflags & PR_FREEHEADER)
1.3       pk        571:                free(pp, M_POOL);
1.1       pk        572: }
                    573:
                    574:
                    575: /*
1.3       pk        576:  * Grab an item from the pool; must be called at appropriate spl level
1.1       pk        577:  */
1.3       pk        578: void *
                    579: _pool_get(pp, flags, file, line)
                    580:        struct pool *pp;
                    581:        int flags;
                    582:        const char *file;
                    583:        long line;
1.1       pk        584: {
                    585:        void *v;
                    586:        struct pool_item *pi;
1.3       pk        587:        struct pool_item_header *ph;
1.1       pk        588:
1.2       pk        589: #ifdef DIAGNOSTIC
1.34      thorpej   590:        if (__predict_false((pp->pr_roflags & PR_STATIC) &&
                    591:                            (flags & PR_MALLOCOK))) {
1.25      thorpej   592:                pr_printlog(pp, NULL, printf);
1.2       pk        593:                panic("pool_get: static");
1.3       pk        594:        }
1.2       pk        595: #endif
                    596:
1.34.2.1! minoura   597:        if (__predict_false(curproc == NULL && doing_shutdown == 0 &&
        !           598:                            (flags & PR_WAITOK) != 0))
1.3       pk        599:                panic("pool_get: must have NOWAIT");
1.1       pk        600:
1.21      thorpej   601:        simple_lock(&pp->pr_slock);
1.25      thorpej   602:        pr_enter(pp, file, line);
1.20      thorpej   603:
                    604:  startover:
                    605:        /*
                    606:         * Check to see if we've reached the hard limit.  If we have,
                    607:         * and we can wait, then wait until an item has been returned to
                    608:         * the pool.
                    609:         */
                    610: #ifdef DIAGNOSTIC
1.34      thorpej   611:        if (__predict_false(pp->pr_nout > pp->pr_hardlimit)) {
1.25      thorpej   612:                pr_leave(pp);
1.21      thorpej   613:                simple_unlock(&pp->pr_slock);
1.20      thorpej   614:                panic("pool_get: %s: crossed hard limit", pp->pr_wchan);
                    615:        }
                    616: #endif
1.34      thorpej   617:        if (__predict_false(pp->pr_nout == pp->pr_hardlimit)) {
1.29      sommerfe  618:                if ((flags & PR_WAITOK) && !(flags & PR_LIMITFAIL)) {
1.20      thorpej   619:                        /*
                    620:                         * XXX: A warning isn't logged in this case.  Should
                    621:                         * it be?
                    622:                         */
                    623:                        pp->pr_flags |= PR_WANTED;
1.25      thorpej   624:                        pr_leave(pp);
1.21      thorpej   625:                        simple_unlock(&pp->pr_slock);
1.20      thorpej   626:                        tsleep((caddr_t)pp, PSWP, pp->pr_wchan, 0);
1.21      thorpej   627:                        simple_lock(&pp->pr_slock);
1.25      thorpej   628:                        pr_enter(pp, file, line);
1.20      thorpej   629:                        goto startover;
                    630:                }
1.31      thorpej   631:
                    632:                /*
                    633:                 * Log a message that the hard limit has been hit.
                    634:                 */
                    635:                if (pp->pr_hardlimit_warning != NULL &&
                    636:                    ratecheck(&pp->pr_hardlimit_warning_last,
                    637:                              &pp->pr_hardlimit_ratecap))
                    638:                        log(LOG_ERR, "%s\n", pp->pr_hardlimit_warning);
1.21      thorpej   639:
                    640:                if (flags & PR_URGENT)
                    641:                        panic("pool_get: urgent");
                    642:
                    643:                pp->pr_nfail++;
                    644:
1.25      thorpej   645:                pr_leave(pp);
1.21      thorpej   646:                simple_unlock(&pp->pr_slock);
1.20      thorpej   647:                return (NULL);
                    648:        }
                    649:
1.3       pk        650:        /*
                    651:         * The convention we use is that if `curpage' is not NULL, then
                    652:         * it points at a non-empty bucket. In particular, `curpage'
                    653:         * never points at a page header which has PR_PHINPAGE set and
                    654:         * has no items in its bucket.
                    655:         */
1.20      thorpej   656:        if ((ph = pp->pr_curpage) == NULL) {
1.15      pk        657:                void *v;
                    658:
1.20      thorpej   659: #ifdef DIAGNOSTIC
                    660:                if (pp->pr_nitems != 0) {
1.21      thorpej   661:                        simple_unlock(&pp->pr_slock);
1.20      thorpej   662:                        printf("pool_get: %s: curpage NULL, nitems %u\n",
                    663:                            pp->pr_wchan, pp->pr_nitems);
                    664:                        panic("pool_get: nitems inconsistent\n");
                    665:                }
                    666: #endif
                    667:
1.21      thorpej   668:                /*
                    669:                 * Call the back-end page allocator for more memory.
                    670:                 * Release the pool lock, as the back-end page allocator
                    671:                 * may block.
                    672:                 */
1.25      thorpej   673:                pr_leave(pp);
1.21      thorpej   674:                simple_unlock(&pp->pr_slock);
                    675:                v = (*pp->pr_alloc)(pp->pr_pagesz, flags, pp->pr_mtype);
                    676:                simple_lock(&pp->pr_slock);
1.25      thorpej   677:                pr_enter(pp, file, line);
1.15      pk        678:
1.21      thorpej   679:                if (v == NULL) {
                    680:                        /*
                    681:                         * We were unable to allocate a page, but
                    682:                         * we released the lock during allocation,
                    683:                         * so perhaps items were freed back to the
                    684:                         * pool.  Check for this case.
                    685:                         */
                    686:                        if (pp->pr_curpage != NULL)
                    687:                                goto startover;
1.15      pk        688:
1.3       pk        689:                        if (flags & PR_URGENT)
                    690:                                panic("pool_get: urgent");
1.21      thorpej   691:
1.3       pk        692:                        if ((flags & PR_WAITOK) == 0) {
                    693:                                pp->pr_nfail++;
1.25      thorpej   694:                                pr_leave(pp);
1.21      thorpej   695:                                simple_unlock(&pp->pr_slock);
1.1       pk        696:                                return (NULL);
1.3       pk        697:                        }
                    698:
1.15      pk        699:                        /*
                    700:                         * Wait for items to be returned to this pool.
1.21      thorpej   701:                         *
1.15      pk        702:                         * XXX: we actually want to wait just until
                    703:                         * the page allocator has memory again. Depending
                    704:                         * on this pool's usage, we might get stuck here
                    705:                         * for a long time.
1.20      thorpej   706:                         *
                    707:                         * XXX: maybe we should wake up once a second and
                    708:                         * try again?
1.15      pk        709:                         */
1.1       pk        710:                        pp->pr_flags |= PR_WANTED;
1.25      thorpej   711:                        pr_leave(pp);
1.21      thorpej   712:                        simple_unlock(&pp->pr_slock);
1.1       pk        713:                        tsleep((caddr_t)pp, PSWP, pp->pr_wchan, 0);
1.21      thorpej   714:                        simple_lock(&pp->pr_slock);
1.25      thorpej   715:                        pr_enter(pp, file, line);
1.20      thorpej   716:                        goto startover;
1.1       pk        717:                }
1.3       pk        718:
1.15      pk        719:                /* We have more memory; add it to the pool */
                    720:                pp->pr_npagealloc++;
                    721:                pool_prime_page(pp, v);
                    722:
1.20      thorpej   723:                /* Start the allocation process over. */
                    724:                goto startover;
1.3       pk        725:        }
                    726:
1.34      thorpej   727:        if (__predict_false((v = pi = TAILQ_FIRST(&ph->ph_itemlist)) == NULL)) {
1.25      thorpej   728:                pr_leave(pp);
1.21      thorpej   729:                simple_unlock(&pp->pr_slock);
1.3       pk        730:                panic("pool_get: %s: page empty", pp->pr_wchan);
1.21      thorpej   731:        }
1.20      thorpej   732: #ifdef DIAGNOSTIC
1.34      thorpej   733:        if (__predict_false(pp->pr_nitems == 0)) {
1.25      thorpej   734:                pr_leave(pp);
1.21      thorpej   735:                simple_unlock(&pp->pr_slock);
1.20      thorpej   736:                printf("pool_get: %s: items on itemlist, nitems %u\n",
                    737:                    pp->pr_wchan, pp->pr_nitems);
                    738:                panic("pool_get: nitems inconsistent\n");
                    739:        }
                    740: #endif
1.3       pk        741:        pr_log(pp, v, PRLOG_GET, file, line);
                    742:
                    743: #ifdef DIAGNOSTIC
1.34      thorpej   744:        if (__predict_false(pi->pi_magic != PI_MAGIC)) {
1.25      thorpej   745:                pr_printlog(pp, pi, printf);
1.3       pk        746:                panic("pool_get(%s): free list modified: magic=%x; page %p;"
                    747:                       " item addr %p\n",
                    748:                        pp->pr_wchan, pi->pi_magic, ph->ph_page, pi);
                    749:        }
                    750: #endif
                    751:
                    752:        /*
                    753:         * Remove from item list.
                    754:         */
                    755:        TAILQ_REMOVE(&ph->ph_itemlist, pi, pi_list);
1.20      thorpej   756:        pp->pr_nitems--;
                    757:        pp->pr_nout++;
1.6       thorpej   758:        if (ph->ph_nmissing == 0) {
                    759: #ifdef DIAGNOSTIC
1.34      thorpej   760:                if (__predict_false(pp->pr_nidle == 0))
1.6       thorpej   761:                        panic("pool_get: nidle inconsistent");
                    762: #endif
                    763:                pp->pr_nidle--;
                    764:        }
1.3       pk        765:        ph->ph_nmissing++;
                    766:        if (TAILQ_FIRST(&ph->ph_itemlist) == NULL) {
1.21      thorpej   767: #ifdef DIAGNOSTIC
1.34      thorpej   768:                if (__predict_false(ph->ph_nmissing != pp->pr_itemsperpage)) {
1.25      thorpej   769:                        pr_leave(pp);
1.21      thorpej   770:                        simple_unlock(&pp->pr_slock);
                    771:                        panic("pool_get: %s: nmissing inconsistent",
                    772:                            pp->pr_wchan);
                    773:                }
                    774: #endif
1.3       pk        775:                /*
                    776:                 * Find a new non-empty page header, if any.
                    777:                 * Start search from the page head, to increase
                    778:                 * the chance for "high water" pages to be freed.
                    779:                 *
1.21      thorpej   780:                 * Migrate empty pages to the end of the list.  This
                    781:                 * will speed the update of curpage as pages become
                    782:                 * idle.  Empty pages intermingled with idle pages
                    783:                 * is no big deal.  As soon as a page becomes un-empty,
                    784:                 * it will move back to the head of the list.
1.3       pk        785:                 */
                    786:                TAILQ_REMOVE(&pp->pr_pagelist, ph, ph_pagelist);
1.21      thorpej   787:                TAILQ_INSERT_TAIL(&pp->pr_pagelist, ph, ph_pagelist);
                    788:                for (ph = TAILQ_FIRST(&pp->pr_pagelist); ph != NULL;
                    789:                     ph = TAILQ_NEXT(ph, ph_pagelist))
1.3       pk        790:                        if (TAILQ_FIRST(&ph->ph_itemlist) != NULL)
                    791:                                break;
                    792:
                    793:                pp->pr_curpage = ph;
1.1       pk        794:        }
1.3       pk        795:
                    796:        pp->pr_nget++;
1.20      thorpej   797:
                    798:        /*
                    799:         * If we have a low water mark and we are now below that low
                    800:         * water mark, add more items to the pool.
                    801:         */
                    802:        if (pp->pr_nitems < pp->pr_minitems && pool_catchup(pp) != 0) {
                    803:                /*
                    804:                 * XXX: Should we log a warning?  Should we set up a timeout
                    805:                 * to try again in a second or so?  The latter could break
                    806:                 * a caller's assumptions about interrupt protection, etc.
                    807:                 */
                    808:        }
                    809:
1.25      thorpej   810:        pr_leave(pp);
1.21      thorpej   811:        simple_unlock(&pp->pr_slock);
1.1       pk        812:        return (v);
                    813: }
                    814:
                    815: /*
1.3       pk        816:  * Return resource to the pool; must be called at appropriate spl level
1.1       pk        817:  */
1.3       pk        818: void
                    819: _pool_put(pp, v, file, line)
                    820:        struct pool *pp;
                    821:        void *v;
                    822:        const char *file;
                    823:        long line;
1.1       pk        824: {
                    825:        struct pool_item *pi = v;
1.3       pk        826:        struct pool_item_header *ph;
                    827:        caddr_t page;
1.21      thorpej   828:        int s;
1.3       pk        829:
                    830:        page = (caddr_t)((u_long)v & pp->pr_pagemask);
1.1       pk        831:
1.21      thorpej   832:        simple_lock(&pp->pr_slock);
1.25      thorpej   833:        pr_enter(pp, file, line);
1.30      thorpej   834:
                    835: #ifdef DIAGNOSTIC
1.34      thorpej   836:        if (__predict_false(pp->pr_nout == 0)) {
1.30      thorpej   837:                printf("pool %s: putting with none out\n",
                    838:                    pp->pr_wchan);
                    839:                panic("pool_put");
                    840:        }
                    841: #endif
1.3       pk        842:
                    843:        pr_log(pp, v, PRLOG_PUT, file, line);
                    844:
1.34      thorpej   845:        if (__predict_false((ph = pr_find_pagehead(pp, page)) == NULL)) {
1.25      thorpej   846:                pr_printlog(pp, NULL, printf);
1.3       pk        847:                panic("pool_put: %s: page header missing", pp->pr_wchan);
                    848:        }
1.28      thorpej   849:
                    850: #ifdef LOCKDEBUG
                    851:        /*
                    852:         * Check if we're freeing a locked simple lock.
                    853:         */
                    854:        simple_lock_freecheck((caddr_t)pi, ((caddr_t)pi) + pp->pr_size);
                    855: #endif
1.3       pk        856:
                    857:        /*
                    858:         * Return to item list.
                    859:         */
1.2       pk        860: #ifdef DIAGNOSTIC
1.3       pk        861:        pi->pi_magic = PI_MAGIC;
                    862: #endif
1.32      chs       863: #ifdef DEBUG
                    864:        {
                    865:                int i, *ip = v;
                    866:
                    867:                for (i = 0; i < pp->pr_size / sizeof(int); i++) {
                    868:                        *ip++ = PI_MAGIC;
                    869:                }
                    870:        }
                    871: #endif
                    872:
1.3       pk        873:        TAILQ_INSERT_HEAD(&ph->ph_itemlist, pi, pi_list);
                    874:        ph->ph_nmissing--;
                    875:        pp->pr_nput++;
1.20      thorpej   876:        pp->pr_nitems++;
                    877:        pp->pr_nout--;
1.3       pk        878:
                    879:        /* Cancel "pool empty" condition if it exists */
                    880:        if (pp->pr_curpage == NULL)
                    881:                pp->pr_curpage = ph;
                    882:
                    883:        if (pp->pr_flags & PR_WANTED) {
                    884:                pp->pr_flags &= ~PR_WANTED;
1.15      pk        885:                if (ph->ph_nmissing == 0)
                    886:                        pp->pr_nidle++;
1.25      thorpej   887:                pr_leave(pp);
1.21      thorpej   888:                simple_unlock(&pp->pr_slock);
1.3       pk        889:                wakeup((caddr_t)pp);
                    890:                return;
                    891:        }
                    892:
                    893:        /*
1.21      thorpej   894:         * If this page is now complete, do one of two things:
                    895:         *
                    896:         *      (1) If we have more pages than the page high water
                    897:         *          mark, free the page back to the system.
                    898:         *
                    899:         *      (2) Move it to the end of the page list, so that
                    900:         *          we minimize our chances of fragmenting the
                    901:         *          pool.  Idle pages migrate to the end (along with
                    902:         *          completely empty pages, so that we find un-empty
                    903:         *          pages more quickly when we update curpage) of the
                    904:         *          list so they can be more easily swept up by
                    905:         *          the pagedaemon when pages are scarce.
1.3       pk        906:         */
                    907:        if (ph->ph_nmissing == 0) {
1.6       thorpej   908:                pp->pr_nidle++;
1.3       pk        909:                if (pp->pr_npages > pp->pr_maxpages) {
                    910:                        pr_rmpage(pp, ph);
                    911:                } else {
                    912:                        TAILQ_REMOVE(&pp->pr_pagelist, ph, ph_pagelist);
                    913:                        TAILQ_INSERT_TAIL(&pp->pr_pagelist, ph, ph_pagelist);
                    914:
1.21      thorpej   915:                        /*
                    916:                         * Update the timestamp on the page.  A page must
                    917:                         * be idle for some period of time before it can
                    918:                         * be reclaimed by the pagedaemon.  This minimizes
                    919:                         * ping-pong'ing for memory.
                    920:                         */
                    921:                        s = splclock();
                    922:                        ph->ph_time = mono_time;
                    923:                        splx(s);
                    924:
                    925:                        /*
                    926:                         * Update the current page pointer.  Just look for
                    927:                         * the first page with any free items.
                    928:                         *
                    929:                         * XXX: Maybe we want an option to look for the
                    930:                         * page with the fewest available items, to minimize
                    931:                         * fragmentation?
                    932:                         */
1.3       pk        933:                        for (ph = TAILQ_FIRST(&pp->pr_pagelist); ph != NULL;
                    934:                             ph = TAILQ_NEXT(ph, ph_pagelist))
                    935:                                if (TAILQ_FIRST(&ph->ph_itemlist) != NULL)
                    936:                                        break;
1.1       pk        937:
1.3       pk        938:                        pp->pr_curpage = ph;
1.1       pk        939:                }
                    940:        }
1.21      thorpej   941:        /*
                    942:         * If the page has just become un-empty, move it to the head of
                    943:         * the list, and make it the current page.  The next allocation
                    944:         * will get the item from this page, instead of further fragmenting
                    945:         * the pool.
                    946:         */
                    947:        else if (ph->ph_nmissing == (pp->pr_itemsperpage - 1)) {
                    948:                TAILQ_REMOVE(&pp->pr_pagelist, ph, ph_pagelist);
                    949:                TAILQ_INSERT_HEAD(&pp->pr_pagelist, ph, ph_pagelist);
                    950:                pp->pr_curpage = ph;
                    951:        }
                    952:
1.25      thorpej   953:        pr_leave(pp);
1.21      thorpej   954:        simple_unlock(&pp->pr_slock);
1.3       pk        955:
1.1       pk        956: }
                    957:
                    958: /*
1.3       pk        959:  * Add N items to the pool.
1.1       pk        960:  */
                    961: int
1.2       pk        962: pool_prime(pp, n, storage)
1.1       pk        963:        struct pool *pp;
                    964:        int n;
1.2       pk        965:        caddr_t storage;
1.1       pk        966: {
1.3       pk        967:        caddr_t cp;
                    968:        int newnitems, newpages;
1.2       pk        969:
                    970: #ifdef DIAGNOSTIC
1.34      thorpej   971:        if (__predict_false(storage && !(pp->pr_roflags & PR_STATIC)))
1.2       pk        972:                panic("pool_prime: static");
                    973:        /* !storage && static caught below */
                    974: #endif
1.1       pk        975:
1.21      thorpej   976:        simple_lock(&pp->pr_slock);
                    977:
1.3       pk        978:        newnitems = pp->pr_minitems + n;
                    979:        newpages =
1.18      thorpej   980:                roundup(newnitems, pp->pr_itemsperpage) / pp->pr_itemsperpage
1.3       pk        981:                - pp->pr_minpages;
                    982:
                    983:        while (newpages-- > 0) {
1.20      thorpej   984:                if (pp->pr_roflags & PR_STATIC) {
1.3       pk        985:                        cp = storage;
                    986:                        storage += pp->pr_pagesz;
                    987:                } else {
1.21      thorpej   988:                        simple_unlock(&pp->pr_slock);
1.3       pk        989:                        cp = (*pp->pr_alloc)(pp->pr_pagesz, 0, pp->pr_mtype);
1.21      thorpej   990:                        simple_lock(&pp->pr_slock);
1.3       pk        991:                }
1.2       pk        992:
1.3       pk        993:                if (cp == NULL) {
1.21      thorpej   994:                        simple_unlock(&pp->pr_slock);
1.1       pk        995:                        return (ENOMEM);
                    996:                }
                    997:
1.26      thorpej   998:                pp->pr_npagealloc++;
1.3       pk        999:                pool_prime_page(pp, cp);
                   1000:                pp->pr_minpages++;
1.1       pk       1001:        }
1.3       pk       1002:
                   1003:        pp->pr_minitems = newnitems;
                   1004:
                   1005:        if (pp->pr_minpages >= pp->pr_maxpages)
                   1006:                pp->pr_maxpages = pp->pr_minpages + 1;  /* XXX */
                   1007:
1.21      thorpej  1008:        simple_unlock(&pp->pr_slock);
1.1       pk       1009:        return (0);
                   1010: }
1.3       pk       1011:
                   1012: /*
                   1013:  * Add a page worth of items to the pool.
1.21      thorpej  1014:  *
                   1015:  * Note, we must be called with the pool descriptor LOCKED.
1.3       pk       1016:  */
1.21      thorpej  1017: static void
1.3       pk       1018: pool_prime_page(pp, storage)
                   1019:        struct pool *pp;
                   1020:        caddr_t storage;
                   1021: {
                   1022:        struct pool_item *pi;
                   1023:        struct pool_item_header *ph;
                   1024:        caddr_t cp = storage;
                   1025:        unsigned int align = pp->pr_align;
                   1026:        unsigned int ioff = pp->pr_itemoffset;
1.27      pk       1027:        int s, n;
1.34.2.1! minoura  1028:
        !          1029:        if (((u_long)cp & (pp->pr_pagesz - 1)) != 0)
        !          1030:                panic("pool_prime_page: %s: unaligned page", pp->pr_wchan);
1.3       pk       1031:
1.20      thorpej  1032:        if ((pp->pr_roflags & PR_PHINPAGE) != 0) {
1.3       pk       1033:                ph = (struct pool_item_header *)(cp + pp->pr_phoffset);
                   1034:        } else {
1.27      pk       1035:                s = splhigh();
1.3       pk       1036:                ph = pool_get(&phpool, PR_URGENT);
1.27      pk       1037:                splx(s);
1.3       pk       1038:                LIST_INSERT_HEAD(&pp->pr_hashtab[PR_HASH_INDEX(pp, cp)],
                   1039:                                 ph, ph_hashlist);
                   1040:        }
                   1041:
                   1042:        /*
                   1043:         * Insert page header.
                   1044:         */
                   1045:        TAILQ_INSERT_HEAD(&pp->pr_pagelist, ph, ph_pagelist);
                   1046:        TAILQ_INIT(&ph->ph_itemlist);
                   1047:        ph->ph_page = storage;
                   1048:        ph->ph_nmissing = 0;
1.21      thorpej  1049:        memset(&ph->ph_time, 0, sizeof(ph->ph_time));
1.3       pk       1050:
1.6       thorpej  1051:        pp->pr_nidle++;
                   1052:
1.3       pk       1053:        /*
                   1054:         * Color this page.
                   1055:         */
                   1056:        cp = (caddr_t)(cp + pp->pr_curcolor);
                   1057:        if ((pp->pr_curcolor += align) > pp->pr_maxcolor)
                   1058:                pp->pr_curcolor = 0;
                   1059:
                   1060:        /*
                   1061:         * Adjust storage to apply aligment to `pr_itemoffset' in each item.
                   1062:         */
                   1063:        if (ioff != 0)
                   1064:                cp = (caddr_t)(cp + (align - ioff));
                   1065:
                   1066:        /*
                   1067:         * Insert remaining chunks on the bucket list.
                   1068:         */
                   1069:        n = pp->pr_itemsperpage;
1.20      thorpej  1070:        pp->pr_nitems += n;
1.3       pk       1071:
                   1072:        while (n--) {
                   1073:                pi = (struct pool_item *)cp;
                   1074:
                   1075:                /* Insert on page list */
                   1076:                TAILQ_INSERT_TAIL(&ph->ph_itemlist, pi, pi_list);
                   1077: #ifdef DIAGNOSTIC
                   1078:                pi->pi_magic = PI_MAGIC;
                   1079: #endif
                   1080:                cp = (caddr_t)(cp + pp->pr_size);
                   1081:        }
                   1082:
                   1083:        /*
                   1084:         * If the pool was depleted, point at the new page.
                   1085:         */
                   1086:        if (pp->pr_curpage == NULL)
                   1087:                pp->pr_curpage = ph;
                   1088:
                   1089:        if (++pp->pr_npages > pp->pr_hiwat)
                   1090:                pp->pr_hiwat = pp->pr_npages;
                   1091: }
                   1092:
1.20      thorpej  1093: /*
                   1094:  * Like pool_prime(), except this is used by pool_get() when nitems
                   1095:  * drops below the low water mark.  This is used to catch up nitmes
                   1096:  * with the low water mark.
                   1097:  *
1.21      thorpej  1098:  * Note 1, we never wait for memory here, we let the caller decide what to do.
1.20      thorpej  1099:  *
                   1100:  * Note 2, this doesn't work with static pools.
                   1101:  *
                   1102:  * Note 3, we must be called with the pool already locked, and we return
                   1103:  * with it locked.
                   1104:  */
                   1105: static int
                   1106: pool_catchup(pp)
                   1107:        struct pool *pp;
                   1108: {
                   1109:        caddr_t cp;
                   1110:        int error = 0;
                   1111:
                   1112:        if (pp->pr_roflags & PR_STATIC) {
                   1113:                /*
                   1114:                 * We dropped below the low water mark, and this is not a
                   1115:                 * good thing.  Log a warning.
1.21      thorpej  1116:                 *
                   1117:                 * XXX: rate-limit this?
1.20      thorpej  1118:                 */
                   1119:                printf("WARNING: static pool `%s' dropped below low water "
                   1120:                    "mark\n", pp->pr_wchan);
                   1121:                return (0);
                   1122:        }
                   1123:
1.21      thorpej  1124:        while (pp->pr_nitems < pp->pr_minitems) {
1.20      thorpej  1125:                /*
1.21      thorpej  1126:                 * Call the page back-end allocator for more memory.
                   1127:                 *
                   1128:                 * XXX: We never wait, so should we bother unlocking
                   1129:                 * the pool descriptor?
1.20      thorpej  1130:                 */
1.21      thorpej  1131:                simple_unlock(&pp->pr_slock);
1.20      thorpej  1132:                cp = (*pp->pr_alloc)(pp->pr_pagesz, 0, pp->pr_mtype);
1.21      thorpej  1133:                simple_lock(&pp->pr_slock);
1.34      thorpej  1134:                if (__predict_false(cp == NULL)) {
1.20      thorpej  1135:                        error = ENOMEM;
                   1136:                        break;
                   1137:                }
1.26      thorpej  1138:                pp->pr_npagealloc++;
1.20      thorpej  1139:                pool_prime_page(pp, cp);
                   1140:        }
                   1141:
                   1142:        return (error);
                   1143: }
                   1144:
1.3       pk       1145: void
                   1146: pool_setlowat(pp, n)
                   1147:        pool_handle_t   pp;
                   1148:        int n;
                   1149: {
1.20      thorpej  1150:        int error;
1.15      pk       1151:
1.21      thorpej  1152:        simple_lock(&pp->pr_slock);
                   1153:
1.3       pk       1154:        pp->pr_minitems = n;
1.15      pk       1155:        pp->pr_minpages = (n == 0)
                   1156:                ? 0
1.18      thorpej  1157:                : roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage;
1.20      thorpej  1158:
                   1159:        /* Make sure we're caught up with the newly-set low water mark. */
1.21      thorpej  1160:        if ((error = pool_catchup(pp)) != 0) {
1.20      thorpej  1161:                /*
                   1162:                 * XXX: Should we log a warning?  Should we set up a timeout
                   1163:                 * to try again in a second or so?  The latter could break
                   1164:                 * a caller's assumptions about interrupt protection, etc.
                   1165:                 */
                   1166:        }
1.21      thorpej  1167:
                   1168:        simple_unlock(&pp->pr_slock);
1.3       pk       1169: }
                   1170:
                   1171: void
                   1172: pool_sethiwat(pp, n)
                   1173:        pool_handle_t   pp;
                   1174:        int n;
                   1175: {
1.15      pk       1176:
1.21      thorpej  1177:        simple_lock(&pp->pr_slock);
                   1178:
1.15      pk       1179:        pp->pr_maxpages = (n == 0)
                   1180:                ? 0
1.18      thorpej  1181:                : roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage;
1.21      thorpej  1182:
                   1183:        simple_unlock(&pp->pr_slock);
1.3       pk       1184: }
                   1185:
1.20      thorpej  1186: void
                   1187: pool_sethardlimit(pp, n, warnmess, ratecap)
                   1188:        pool_handle_t pp;
                   1189:        int n;
                   1190:        const char *warnmess;
                   1191:        int ratecap;
                   1192: {
                   1193:
1.21      thorpej  1194:        simple_lock(&pp->pr_slock);
1.20      thorpej  1195:
                   1196:        pp->pr_hardlimit = n;
                   1197:        pp->pr_hardlimit_warning = warnmess;
1.31      thorpej  1198:        pp->pr_hardlimit_ratecap.tv_sec = ratecap;
                   1199:        pp->pr_hardlimit_warning_last.tv_sec = 0;
                   1200:        pp->pr_hardlimit_warning_last.tv_usec = 0;
1.20      thorpej  1201:
                   1202:        /*
1.21      thorpej  1203:         * In-line version of pool_sethiwat(), because we don't want to
                   1204:         * release the lock.
1.20      thorpej  1205:         */
                   1206:        pp->pr_maxpages = (n == 0)
                   1207:                ? 0
                   1208:                : roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage;
1.21      thorpej  1209:
                   1210:        simple_unlock(&pp->pr_slock);
1.20      thorpej  1211: }
1.3       pk       1212:
                   1213: /*
                   1214:  * Default page allocator.
                   1215:  */
                   1216: static void *
                   1217: pool_page_alloc(sz, flags, mtype)
                   1218:        unsigned long sz;
                   1219:        int flags;
                   1220:        int mtype;
                   1221: {
1.11      thorpej  1222:        boolean_t waitok = (flags & PR_WAITOK) ? TRUE : FALSE;
1.3       pk       1223:
1.11      thorpej  1224:        return ((void *)uvm_km_alloc_poolpage(waitok));
1.3       pk       1225: }
                   1226:
                   1227: static void
                   1228: pool_page_free(v, sz, mtype)
                   1229:        void *v;
                   1230:        unsigned long sz;
                   1231:        int mtype;
                   1232: {
                   1233:
1.10      eeh      1234:        uvm_km_free_poolpage((vaddr_t)v);
1.3       pk       1235: }
1.12      thorpej  1236:
                   1237: /*
                   1238:  * Alternate pool page allocator for pools that know they will
                   1239:  * never be accessed in interrupt context.
                   1240:  */
                   1241: void *
                   1242: pool_page_alloc_nointr(sz, flags, mtype)
                   1243:        unsigned long sz;
                   1244:        int flags;
                   1245:        int mtype;
                   1246: {
                   1247:        boolean_t waitok = (flags & PR_WAITOK) ? TRUE : FALSE;
                   1248:
                   1249:        return ((void *)uvm_km_alloc_poolpage1(kernel_map, uvm.kernel_object,
                   1250:            waitok));
                   1251: }
                   1252:
                   1253: void
                   1254: pool_page_free_nointr(v, sz, mtype)
                   1255:        void *v;
                   1256:        unsigned long sz;
                   1257:        int mtype;
                   1258: {
                   1259:
                   1260:        uvm_km_free_poolpage1(kernel_map, (vaddr_t)v);
                   1261: }
                   1262:
1.3       pk       1263:
                   1264: /*
                   1265:  * Release all complete pages that have not been used recently.
                   1266:  */
                   1267: void
1.25      thorpej  1268: _pool_reclaim(pp, file, line)
1.3       pk       1269:        pool_handle_t pp;
1.25      thorpej  1270:        const char *file;
                   1271:        long line;
1.3       pk       1272: {
                   1273:        struct pool_item_header *ph, *phnext;
1.21      thorpej  1274:        struct timeval curtime;
                   1275:        int s;
1.3       pk       1276:
1.20      thorpej  1277:        if (pp->pr_roflags & PR_STATIC)
1.3       pk       1278:                return;
                   1279:
1.21      thorpej  1280:        if (simple_lock_try(&pp->pr_slock) == 0)
1.3       pk       1281:                return;
1.25      thorpej  1282:        pr_enter(pp, file, line);
1.3       pk       1283:
1.21      thorpej  1284:        s = splclock();
                   1285:        curtime = mono_time;
                   1286:        splx(s);
                   1287:
1.3       pk       1288:        for (ph = TAILQ_FIRST(&pp->pr_pagelist); ph != NULL; ph = phnext) {
                   1289:                phnext = TAILQ_NEXT(ph, ph_pagelist);
                   1290:
                   1291:                /* Check our minimum page claim */
                   1292:                if (pp->pr_npages <= pp->pr_minpages)
                   1293:                        break;
                   1294:
                   1295:                if (ph->ph_nmissing == 0) {
                   1296:                        struct timeval diff;
                   1297:                        timersub(&curtime, &ph->ph_time, &diff);
                   1298:                        if (diff.tv_sec < pool_inactive_time)
                   1299:                                continue;
1.21      thorpej  1300:
                   1301:                        /*
                   1302:                         * If freeing this page would put us below
                   1303:                         * the low water mark, stop now.
                   1304:                         */
                   1305:                        if ((pp->pr_nitems - pp->pr_itemsperpage) <
                   1306:                            pp->pr_minitems)
                   1307:                                break;
                   1308:
1.3       pk       1309:                        pr_rmpage(pp, ph);
                   1310:                }
                   1311:        }
                   1312:
1.25      thorpej  1313:        pr_leave(pp);
1.21      thorpej  1314:        simple_unlock(&pp->pr_slock);
1.3       pk       1315: }
                   1316:
                   1317:
                   1318: /*
                   1319:  * Drain pools, one at a time.
1.21      thorpej  1320:  *
                   1321:  * Note, we must never be called from an interrupt context.
1.3       pk       1322:  */
                   1323: void
                   1324: pool_drain(arg)
                   1325:        void *arg;
                   1326: {
                   1327:        struct pool *pp;
1.23      thorpej  1328:        int s;
1.3       pk       1329:
1.23      thorpej  1330:        s = splimp();
                   1331:        simple_lock(&pool_head_slock);
                   1332:
                   1333:        if (drainpp == NULL && (drainpp = TAILQ_FIRST(&pool_head)) == NULL)
                   1334:                goto out;
1.3       pk       1335:
                   1336:        pp = drainpp;
                   1337:        drainpp = TAILQ_NEXT(pp, pr_poollist);
                   1338:
                   1339:        pool_reclaim(pp);
1.23      thorpej  1340:
                   1341:  out:
                   1342:        simple_unlock(&pool_head_slock);
1.3       pk       1343:        splx(s);
                   1344: }
                   1345:
                   1346:
                   1347: /*
                   1348:  * Diagnostic helpers.
                   1349:  */
                   1350: void
1.25      thorpej  1351: pool_print(pp, modif)
1.3       pk       1352:        struct pool *pp;
1.25      thorpej  1353:        const char *modif;
1.21      thorpej  1354: {
                   1355:        int s;
                   1356:
                   1357:        s = splimp();
1.25      thorpej  1358:        if (simple_lock_try(&pp->pr_slock) == 0) {
                   1359:                printf("pool %s is locked; try again later\n",
                   1360:                    pp->pr_wchan);
                   1361:                splx(s);
                   1362:                return;
                   1363:        }
                   1364:        pool_print1(pp, modif, printf);
1.21      thorpej  1365:        simple_unlock(&pp->pr_slock);
                   1366:        splx(s);
                   1367: }
                   1368:
1.25      thorpej  1369: void
                   1370: pool_printit(pp, modif, pr)
                   1371:        struct pool *pp;
                   1372:        const char *modif;
                   1373:        void (*pr) __P((const char *, ...));
                   1374: {
                   1375:        int didlock = 0;
                   1376:
                   1377:        if (pp == NULL) {
                   1378:                (*pr)("Must specify a pool to print.\n");
                   1379:                return;
                   1380:        }
                   1381:
                   1382:        /*
                   1383:         * Called from DDB; interrupts should be blocked, and all
                   1384:         * other processors should be paused.  We can skip locking
                   1385:         * the pool in this case.
                   1386:         *
                   1387:         * We do a simple_lock_try() just to print the lock
                   1388:         * status, however.
                   1389:         */
                   1390:
                   1391:        if (simple_lock_try(&pp->pr_slock) == 0)
                   1392:                (*pr)("WARNING: pool %s is locked\n", pp->pr_wchan);
                   1393:        else
                   1394:                didlock = 1;
                   1395:
                   1396:        pool_print1(pp, modif, pr);
                   1397:
                   1398:        if (didlock)
                   1399:                simple_unlock(&pp->pr_slock);
                   1400: }
                   1401:
1.21      thorpej  1402: static void
1.25      thorpej  1403: pool_print1(pp, modif, pr)
1.21      thorpej  1404:        struct pool *pp;
1.25      thorpej  1405:        const char *modif;
                   1406:        void (*pr) __P((const char *, ...));
1.3       pk       1407: {
1.25      thorpej  1408:        struct pool_item_header *ph;
                   1409: #ifdef DIAGNOSTIC
                   1410:        struct pool_item *pi;
                   1411: #endif
                   1412:        int print_log = 0, print_pagelist = 0;
                   1413:        char c;
                   1414:
                   1415:        while ((c = *modif++) != '\0') {
                   1416:                if (c == 'l')
                   1417:                        print_log = 1;
                   1418:                if (c == 'p')
                   1419:                        print_pagelist = 1;
                   1420:                modif++;
                   1421:        }
                   1422:
                   1423:        (*pr)("POOL %s: size %u, align %u, ioff %u, roflags 0x%08x\n",
                   1424:            pp->pr_wchan, pp->pr_size, pp->pr_align, pp->pr_itemoffset,
                   1425:            pp->pr_roflags);
                   1426:        (*pr)("\tpagesz %u, mtype %d\n", pp->pr_pagesz, pp->pr_mtype);
                   1427:        (*pr)("\talloc %p, release %p\n", pp->pr_alloc, pp->pr_free);
                   1428:        (*pr)("\tminitems %u, minpages %u, maxpages %u, npages %u\n",
                   1429:            pp->pr_minitems, pp->pr_minpages, pp->pr_maxpages, pp->pr_npages);
                   1430:        (*pr)("\titemsperpage %u, nitems %u, nout %u, hardlimit %u\n",
                   1431:            pp->pr_itemsperpage, pp->pr_nitems, pp->pr_nout, pp->pr_hardlimit);
                   1432:
                   1433:        (*pr)("\n\tnget %lu, nfail %lu, nput %lu\n",
                   1434:            pp->pr_nget, pp->pr_nfail, pp->pr_nput);
                   1435:        (*pr)("\tnpagealloc %lu, npagefree %lu, hiwat %u, nidle %lu\n",
                   1436:            pp->pr_npagealloc, pp->pr_npagefree, pp->pr_hiwat, pp->pr_nidle);
                   1437:
                   1438:        if (print_pagelist == 0)
                   1439:                goto skip_pagelist;
                   1440:
                   1441:        if ((ph = TAILQ_FIRST(&pp->pr_pagelist)) != NULL)
                   1442:                (*pr)("\n\tpage list:\n");
                   1443:        for (; ph != NULL; ph = TAILQ_NEXT(ph, ph_pagelist)) {
                   1444:                (*pr)("\t\tpage %p, nmissing %d, time %lu,%lu\n",
                   1445:                    ph->ph_page, ph->ph_nmissing,
                   1446:                    (u_long)ph->ph_time.tv_sec,
                   1447:                    (u_long)ph->ph_time.tv_usec);
                   1448: #ifdef DIAGNOSTIC
                   1449:                for (pi = TAILQ_FIRST(&ph->ph_itemlist); pi != NULL;
                   1450:                     pi = TAILQ_NEXT(pi, pi_list)) {
                   1451:                        if (pi->pi_magic != PI_MAGIC) {
                   1452:                                (*pr)("\t\t\titem %p, magic 0x%x\n",
                   1453:                                    pi, pi->pi_magic);
                   1454:                        }
                   1455:                }
                   1456: #endif
                   1457:        }
                   1458:        if (pp->pr_curpage == NULL)
                   1459:                (*pr)("\tno current page\n");
                   1460:        else
                   1461:                (*pr)("\tcurpage %p\n", pp->pr_curpage->ph_page);
                   1462:
                   1463:  skip_pagelist:
                   1464:
                   1465:        if (print_log == 0)
                   1466:                goto skip_log;
                   1467:
                   1468:        (*pr)("\n");
                   1469:        if ((pp->pr_roflags & PR_LOGGING) == 0)
                   1470:                (*pr)("\tno log\n");
                   1471:        else
                   1472:                pr_printlog(pp, NULL, pr);
1.3       pk       1473:
1.25      thorpej  1474:  skip_log:
1.3       pk       1475:
1.25      thorpej  1476:        pr_enter_check(pp, pr);
1.3       pk       1477: }
                   1478:
                   1479: int
                   1480: pool_chk(pp, label)
                   1481:        struct pool *pp;
                   1482:        char *label;
                   1483: {
                   1484:        struct pool_item_header *ph;
                   1485:        int r = 0;
                   1486:
1.21      thorpej  1487:        simple_lock(&pp->pr_slock);
1.3       pk       1488:
                   1489:        for (ph = TAILQ_FIRST(&pp->pr_pagelist); ph != NULL;
                   1490:             ph = TAILQ_NEXT(ph, ph_pagelist)) {
                   1491:
                   1492:                struct pool_item *pi;
                   1493:                int n;
                   1494:                caddr_t page;
                   1495:
                   1496:                page = (caddr_t)((u_long)ph & pp->pr_pagemask);
1.20      thorpej  1497:                if (page != ph->ph_page &&
                   1498:                    (pp->pr_roflags & PR_PHINPAGE) != 0) {
1.3       pk       1499:                        if (label != NULL)
                   1500:                                printf("%s: ", label);
1.16      briggs   1501:                        printf("pool(%p:%s): page inconsistency: page %p;"
                   1502:                               " at page head addr %p (p %p)\n", pp,
1.3       pk       1503:                                pp->pr_wchan, ph->ph_page,
                   1504:                                ph, page);
                   1505:                        r++;
                   1506:                        goto out;
                   1507:                }
                   1508:
                   1509:                for (pi = TAILQ_FIRST(&ph->ph_itemlist), n = 0;
                   1510:                     pi != NULL;
                   1511:                     pi = TAILQ_NEXT(pi,pi_list), n++) {
                   1512:
                   1513: #ifdef DIAGNOSTIC
                   1514:                        if (pi->pi_magic != PI_MAGIC) {
                   1515:                                if (label != NULL)
                   1516:                                        printf("%s: ", label);
                   1517:                                printf("pool(%s): free list modified: magic=%x;"
                   1518:                                       " page %p; item ordinal %d;"
                   1519:                                       " addr %p (p %p)\n",
                   1520:                                        pp->pr_wchan, pi->pi_magic, ph->ph_page,
                   1521:                                        n, pi, page);
                   1522:                                panic("pool");
                   1523:                        }
                   1524: #endif
                   1525:                        page = (caddr_t)((u_long)pi & pp->pr_pagemask);
                   1526:                        if (page == ph->ph_page)
                   1527:                                continue;
                   1528:
                   1529:                        if (label != NULL)
                   1530:                                printf("%s: ", label);
1.16      briggs   1531:                        printf("pool(%p:%s): page inconsistency: page %p;"
                   1532:                               " item ordinal %d; addr %p (p %p)\n", pp,
1.3       pk       1533:                                pp->pr_wchan, ph->ph_page,
                   1534:                                n, pi, page);
                   1535:                        r++;
                   1536:                        goto out;
                   1537:                }
                   1538:        }
                   1539: out:
1.21      thorpej  1540:        simple_unlock(&pp->pr_slock);
1.3       pk       1541:        return (r);
                   1542: }

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