[BACK]Return to subr_pool.c CVS log [TXT][DIR] Up to [cvs.NetBSD.org] / src / sys / kern

Annotation of src/sys/kern/subr_pool.c, Revision 1.30

1.30    ! thorpej     1: /*     $NetBSD: subr_pool.c,v 1.29 1999/08/05 04:00:04 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;
1.25      thorpej   100: #define        PI_MAGIC 0xdeadbeef
1.3       pk        101: #endif
                    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:
                    218:        if (pp->pr_entered_file != NULL) {
                    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:
                    235:        if (pp->pr_entered_file == NULL) {
                    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:         */
                    407:        if (!powerof2(pagesz) || pagesz > PAGE_SIZE)
                    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:
                    428:        /*
                    429:         * Initialize the pool structure.
                    430:         */
                    431:        TAILQ_INIT(&pp->pr_pagelist);
                    432:        pp->pr_curpage = NULL;
                    433:        pp->pr_npages = 0;
                    434:        pp->pr_minitems = 0;
                    435:        pp->pr_minpages = 0;
                    436:        pp->pr_maxpages = UINT_MAX;
1.20      thorpej   437:        pp->pr_roflags = flags;
                    438:        pp->pr_flags = 0;
1.3       pk        439:        pp->pr_size = ALIGN(size);
                    440:        pp->pr_align = align;
                    441:        pp->pr_wchan = wchan;
                    442:        pp->pr_mtype = mtype;
                    443:        pp->pr_alloc = alloc;
                    444:        pp->pr_free = release;
                    445:        pp->pr_pagesz = pagesz;
                    446:        pp->pr_pagemask = ~(pagesz - 1);
                    447:        pp->pr_pageshift = ffs(pagesz) - 1;
1.20      thorpej   448:        pp->pr_nitems = 0;
                    449:        pp->pr_nout = 0;
                    450:        pp->pr_hardlimit = UINT_MAX;
                    451:        pp->pr_hardlimit_warning = NULL;
                    452:        pp->pr_hardlimit_ratecap = 0;
                    453:        memset(&pp->pr_hardlimit_warning_last, 0,
                    454:            sizeof(pp->pr_hardlimit_warning_last));
1.3       pk        455:
                    456:        /*
                    457:         * Decide whether to put the page header off page to avoid
                    458:         * wasting too large a part of the page. Off-page page headers
                    459:         * go on a hash table, so we can match a returned item
                    460:         * with its header based on the page address.
                    461:         * We use 1/16 of the page size as the threshold (XXX: tune)
                    462:         */
                    463:        if (pp->pr_size < pagesz/16) {
                    464:                /* Use the end of the page for the page header */
1.20      thorpej   465:                pp->pr_roflags |= PR_PHINPAGE;
1.3       pk        466:                pp->pr_phoffset = off =
                    467:                        pagesz - ALIGN(sizeof(struct pool_item_header));
1.2       pk        468:        } else {
1.3       pk        469:                /* The page header will be taken from our page header pool */
                    470:                pp->pr_phoffset = 0;
                    471:                off = pagesz;
1.16      briggs    472:                for (i = 0; i < PR_HASHTABSIZE; i++) {
                    473:                        LIST_INIT(&pp->pr_hashtab[i]);
                    474:                }
1.2       pk        475:        }
1.1       pk        476:
1.3       pk        477:        /*
                    478:         * Alignment is to take place at `ioff' within the item. This means
                    479:         * we must reserve up to `align - 1' bytes on the page to allow
                    480:         * appropriate positioning of each item.
                    481:         *
                    482:         * Silently enforce `0 <= ioff < align'.
                    483:         */
                    484:        pp->pr_itemoffset = ioff = ioff % align;
                    485:        pp->pr_itemsperpage = (off - ((align - ioff) % align)) / pp->pr_size;
                    486:
                    487:        /*
                    488:         * Use the slack between the chunks and the page header
                    489:         * for "cache coloring".
                    490:         */
                    491:        slack = off - pp->pr_itemsperpage * pp->pr_size;
                    492:        pp->pr_maxcolor = (slack / align) * align;
                    493:        pp->pr_curcolor = 0;
                    494:
                    495:        pp->pr_nget = 0;
                    496:        pp->pr_nfail = 0;
                    497:        pp->pr_nput = 0;
                    498:        pp->pr_npagealloc = 0;
                    499:        pp->pr_npagefree = 0;
1.1       pk        500:        pp->pr_hiwat = 0;
1.8       thorpej   501:        pp->pr_nidle = 0;
1.3       pk        502:
1.25      thorpej   503:        if (flags & PR_LOGGING) {
                    504:                if (kmem_map == NULL ||
                    505:                    (pp->pr_log = malloc(pool_logsize * sizeof(struct pool_log),
                    506:                     M_TEMP, M_NOWAIT)) == NULL)
1.20      thorpej   507:                        pp->pr_roflags &= ~PR_LOGGING;
1.3       pk        508:                pp->pr_curlogentry = 0;
                    509:                pp->pr_logsize = pool_logsize;
                    510:        }
1.25      thorpej   511:
                    512:        pp->pr_entered_file = NULL;
                    513:        pp->pr_entered_line = 0;
1.3       pk        514:
1.21      thorpej   515:        simple_lock_init(&pp->pr_slock);
1.1       pk        516:
1.3       pk        517:        /*
                    518:         * Initialize private page header pool if we haven't done so yet.
1.23      thorpej   519:         * XXX LOCKING.
1.3       pk        520:         */
                    521:        if (phpool.pr_size == 0) {
                    522:                pool_init(&phpool, sizeof(struct pool_item_header), 0, 0,
                    523:                          0, "phpool", 0, 0, 0, 0);
1.1       pk        524:        }
                    525:
1.23      thorpej   526:        /* Insert into the list of all pools. */
                    527:        simple_lock(&pool_head_slock);
                    528:        TAILQ_INSERT_TAIL(&pool_head, pp, pr_poollist);
                    529:        simple_unlock(&pool_head_slock);
1.1       pk        530: }
                    531:
                    532: /*
                    533:  * De-commision a pool resource.
                    534:  */
                    535: void
                    536: pool_destroy(pp)
                    537:        struct pool *pp;
                    538: {
1.3       pk        539:        struct pool_item_header *ph;
                    540:
                    541: #ifdef DIAGNOSTIC
1.20      thorpej   542:        if (pp->pr_nout != 0) {
1.25      thorpej   543:                pr_printlog(pp, NULL, printf);
1.20      thorpej   544:                panic("pool_destroy: pool busy: still out: %u\n",
                    545:                    pp->pr_nout);
1.3       pk        546:        }
                    547: #endif
1.1       pk        548:
1.3       pk        549:        /* Remove all pages */
1.20      thorpej   550:        if ((pp->pr_roflags & PR_STATIC) == 0)
1.3       pk        551:                while ((ph = pp->pr_pagelist.tqh_first) != NULL)
                    552:                        pr_rmpage(pp, ph);
                    553:
                    554:        /* Remove from global pool list */
1.23      thorpej   555:        simple_lock(&pool_head_slock);
1.3       pk        556:        TAILQ_REMOVE(&pool_head, pp, pr_poollist);
1.23      thorpej   557:        /* XXX Only clear this if we were drainpp? */
1.3       pk        558:        drainpp = NULL;
1.23      thorpej   559:        simple_unlock(&pool_head_slock);
1.3       pk        560:
1.20      thorpej   561:        if ((pp->pr_roflags & PR_LOGGING) != 0)
1.3       pk        562:                free(pp->pr_log, M_TEMP);
1.2       pk        563:
1.20      thorpej   564:        if (pp->pr_roflags & PR_FREEHEADER)
1.3       pk        565:                free(pp, M_POOL);
1.1       pk        566: }
                    567:
                    568:
                    569: /*
1.3       pk        570:  * Grab an item from the pool; must be called at appropriate spl level
1.1       pk        571:  */
1.3       pk        572: void *
                    573: _pool_get(pp, flags, file, line)
                    574:        struct pool *pp;
                    575:        int flags;
                    576:        const char *file;
                    577:        long line;
1.1       pk        578: {
                    579:        void *v;
                    580:        struct pool_item *pi;
1.3       pk        581:        struct pool_item_header *ph;
1.1       pk        582:
1.2       pk        583: #ifdef DIAGNOSTIC
1.20      thorpej   584:        if ((pp->pr_roflags & PR_STATIC) && (flags & PR_MALLOCOK)) {
1.25      thorpej   585:                pr_printlog(pp, NULL, printf);
1.2       pk        586:                panic("pool_get: static");
1.3       pk        587:        }
1.2       pk        588: #endif
                    589:
1.3       pk        590:        if (curproc == NULL && (flags & PR_WAITOK) != 0)
                    591:                panic("pool_get: must have NOWAIT");
1.1       pk        592:
1.21      thorpej   593:        simple_lock(&pp->pr_slock);
1.25      thorpej   594:        pr_enter(pp, file, line);
1.20      thorpej   595:
                    596:  startover:
                    597:        /*
                    598:         * Check to see if we've reached the hard limit.  If we have,
                    599:         * and we can wait, then wait until an item has been returned to
                    600:         * the pool.
                    601:         */
                    602: #ifdef DIAGNOSTIC
                    603:        if (pp->pr_nout > pp->pr_hardlimit) {
1.25      thorpej   604:                pr_leave(pp);
1.21      thorpej   605:                simple_unlock(&pp->pr_slock);
1.20      thorpej   606:                panic("pool_get: %s: crossed hard limit", pp->pr_wchan);
                    607:        }
                    608: #endif
                    609:        if (pp->pr_nout == pp->pr_hardlimit) {
1.29      sommerfe  610:                if ((flags & PR_WAITOK) && !(flags & PR_LIMITFAIL)) {
1.20      thorpej   611:                        /*
                    612:                         * XXX: A warning isn't logged in this case.  Should
                    613:                         * it be?
                    614:                         */
                    615:                        pp->pr_flags |= PR_WANTED;
1.25      thorpej   616:                        pr_leave(pp);
1.21      thorpej   617:                        simple_unlock(&pp->pr_slock);
1.20      thorpej   618:                        tsleep((caddr_t)pp, PSWP, pp->pr_wchan, 0);
1.21      thorpej   619:                        simple_lock(&pp->pr_slock);
1.25      thorpej   620:                        pr_enter(pp, file, line);
1.20      thorpej   621:                        goto startover;
                    622:                }
                    623:                if (pp->pr_hardlimit_warning != NULL) {
                    624:                        /*
                    625:                         * Log a message that the hard limit has been hit.
                    626:                         */
                    627:                        struct timeval curtime, logdiff;
                    628:                        int s = splclock();
                    629:                        curtime = mono_time;
                    630:                        splx(s);
                    631:                        timersub(&curtime, &pp->pr_hardlimit_warning_last,
                    632:                            &logdiff);
                    633:                        if (logdiff.tv_sec >= pp->pr_hardlimit_ratecap) {
                    634:                                pp->pr_hardlimit_warning_last = curtime;
                    635:                                log(LOG_ERR, "%s\n", pp->pr_hardlimit_warning);
                    636:                        }
                    637:                }
1.21      thorpej   638:
                    639:                if (flags & PR_URGENT)
                    640:                        panic("pool_get: urgent");
                    641:
                    642:                pp->pr_nfail++;
                    643:
1.25      thorpej   644:                pr_leave(pp);
1.21      thorpej   645:                simple_unlock(&pp->pr_slock);
1.20      thorpej   646:                return (NULL);
                    647:        }
                    648:
1.3       pk        649:        /*
                    650:         * The convention we use is that if `curpage' is not NULL, then
                    651:         * it points at a non-empty bucket. In particular, `curpage'
                    652:         * never points at a page header which has PR_PHINPAGE set and
                    653:         * has no items in its bucket.
                    654:         */
1.20      thorpej   655:        if ((ph = pp->pr_curpage) == NULL) {
1.15      pk        656:                void *v;
                    657:
1.20      thorpej   658: #ifdef DIAGNOSTIC
                    659:                if (pp->pr_nitems != 0) {
1.21      thorpej   660:                        simple_unlock(&pp->pr_slock);
1.20      thorpej   661:                        printf("pool_get: %s: curpage NULL, nitems %u\n",
                    662:                            pp->pr_wchan, pp->pr_nitems);
                    663:                        panic("pool_get: nitems inconsistent\n");
                    664:                }
                    665: #endif
                    666:
1.21      thorpej   667:                /*
                    668:                 * Call the back-end page allocator for more memory.
                    669:                 * Release the pool lock, as the back-end page allocator
                    670:                 * may block.
                    671:                 */
1.25      thorpej   672:                pr_leave(pp);
1.21      thorpej   673:                simple_unlock(&pp->pr_slock);
                    674:                v = (*pp->pr_alloc)(pp->pr_pagesz, flags, pp->pr_mtype);
                    675:                simple_lock(&pp->pr_slock);
1.25      thorpej   676:                pr_enter(pp, file, line);
1.15      pk        677:
1.21      thorpej   678:                if (v == NULL) {
                    679:                        /*
                    680:                         * We were unable to allocate a page, but
                    681:                         * we released the lock during allocation,
                    682:                         * so perhaps items were freed back to the
                    683:                         * pool.  Check for this case.
                    684:                         */
                    685:                        if (pp->pr_curpage != NULL)
                    686:                                goto startover;
1.15      pk        687:
1.3       pk        688:                        if (flags & PR_URGENT)
                    689:                                panic("pool_get: urgent");
1.21      thorpej   690:
1.3       pk        691:                        if ((flags & PR_WAITOK) == 0) {
                    692:                                pp->pr_nfail++;
1.25      thorpej   693:                                pr_leave(pp);
1.21      thorpej   694:                                simple_unlock(&pp->pr_slock);
1.1       pk        695:                                return (NULL);
1.3       pk        696:                        }
                    697:
1.15      pk        698:                        /*
                    699:                         * Wait for items to be returned to this pool.
1.21      thorpej   700:                         *
1.15      pk        701:                         * XXX: we actually want to wait just until
                    702:                         * the page allocator has memory again. Depending
                    703:                         * on this pool's usage, we might get stuck here
                    704:                         * for a long time.
1.20      thorpej   705:                         *
                    706:                         * XXX: maybe we should wake up once a second and
                    707:                         * try again?
1.15      pk        708:                         */
1.1       pk        709:                        pp->pr_flags |= PR_WANTED;
1.25      thorpej   710:                        pr_leave(pp);
1.21      thorpej   711:                        simple_unlock(&pp->pr_slock);
1.1       pk        712:                        tsleep((caddr_t)pp, PSWP, pp->pr_wchan, 0);
1.21      thorpej   713:                        simple_lock(&pp->pr_slock);
1.25      thorpej   714:                        pr_enter(pp, file, line);
1.20      thorpej   715:                        goto startover;
1.1       pk        716:                }
1.3       pk        717:
1.15      pk        718:                /* We have more memory; add it to the pool */
                    719:                pp->pr_npagealloc++;
                    720:                pool_prime_page(pp, v);
                    721:
1.20      thorpej   722:                /* Start the allocation process over. */
                    723:                goto startover;
1.3       pk        724:        }
                    725:
1.21      thorpej   726:        if ((v = pi = TAILQ_FIRST(&ph->ph_itemlist)) == NULL) {
1.25      thorpej   727:                pr_leave(pp);
1.21      thorpej   728:                simple_unlock(&pp->pr_slock);
1.3       pk        729:                panic("pool_get: %s: page empty", pp->pr_wchan);
1.21      thorpej   730:        }
1.20      thorpej   731: #ifdef DIAGNOSTIC
                    732:        if (pp->pr_nitems == 0) {
1.25      thorpej   733:                pr_leave(pp);
1.21      thorpej   734:                simple_unlock(&pp->pr_slock);
1.20      thorpej   735:                printf("pool_get: %s: items on itemlist, nitems %u\n",
                    736:                    pp->pr_wchan, pp->pr_nitems);
                    737:                panic("pool_get: nitems inconsistent\n");
                    738:        }
                    739: #endif
1.3       pk        740:        pr_log(pp, v, PRLOG_GET, file, line);
                    741:
                    742: #ifdef DIAGNOSTIC
                    743:        if (pi->pi_magic != PI_MAGIC) {
1.25      thorpej   744:                pr_printlog(pp, pi, printf);
1.3       pk        745:                panic("pool_get(%s): free list modified: magic=%x; page %p;"
                    746:                       " item addr %p\n",
                    747:                        pp->pr_wchan, pi->pi_magic, ph->ph_page, pi);
                    748:        }
                    749: #endif
                    750:
                    751:        /*
                    752:         * Remove from item list.
                    753:         */
                    754:        TAILQ_REMOVE(&ph->ph_itemlist, pi, pi_list);
1.20      thorpej   755:        pp->pr_nitems--;
                    756:        pp->pr_nout++;
1.6       thorpej   757:        if (ph->ph_nmissing == 0) {
                    758: #ifdef DIAGNOSTIC
                    759:                if (pp->pr_nidle == 0)
                    760:                        panic("pool_get: nidle inconsistent");
                    761: #endif
                    762:                pp->pr_nidle--;
                    763:        }
1.3       pk        764:        ph->ph_nmissing++;
                    765:        if (TAILQ_FIRST(&ph->ph_itemlist) == NULL) {
1.21      thorpej   766: #ifdef DIAGNOSTIC
                    767:                if (ph->ph_nmissing != pp->pr_itemsperpage) {
1.25      thorpej   768:                        pr_leave(pp);
1.21      thorpej   769:                        simple_unlock(&pp->pr_slock);
                    770:                        panic("pool_get: %s: nmissing inconsistent",
                    771:                            pp->pr_wchan);
                    772:                }
                    773: #endif
1.3       pk        774:                /*
                    775:                 * Find a new non-empty page header, if any.
                    776:                 * Start search from the page head, to increase
                    777:                 * the chance for "high water" pages to be freed.
                    778:                 *
1.21      thorpej   779:                 * Migrate empty pages to the end of the list.  This
                    780:                 * will speed the update of curpage as pages become
                    781:                 * idle.  Empty pages intermingled with idle pages
                    782:                 * is no big deal.  As soon as a page becomes un-empty,
                    783:                 * it will move back to the head of the list.
1.3       pk        784:                 */
                    785:                TAILQ_REMOVE(&pp->pr_pagelist, ph, ph_pagelist);
1.21      thorpej   786:                TAILQ_INSERT_TAIL(&pp->pr_pagelist, ph, ph_pagelist);
                    787:                for (ph = TAILQ_FIRST(&pp->pr_pagelist); ph != NULL;
                    788:                     ph = TAILQ_NEXT(ph, ph_pagelist))
1.3       pk        789:                        if (TAILQ_FIRST(&ph->ph_itemlist) != NULL)
                    790:                                break;
                    791:
                    792:                pp->pr_curpage = ph;
1.1       pk        793:        }
1.3       pk        794:
                    795:        pp->pr_nget++;
1.20      thorpej   796:
                    797:        /*
                    798:         * If we have a low water mark and we are now below that low
                    799:         * water mark, add more items to the pool.
                    800:         */
                    801:        if (pp->pr_nitems < pp->pr_minitems && pool_catchup(pp) != 0) {
                    802:                /*
                    803:                 * XXX: Should we log a warning?  Should we set up a timeout
                    804:                 * to try again in a second or so?  The latter could break
                    805:                 * a caller's assumptions about interrupt protection, etc.
                    806:                 */
                    807:        }
                    808:
1.25      thorpej   809:        pr_leave(pp);
1.21      thorpej   810:        simple_unlock(&pp->pr_slock);
1.1       pk        811:        return (v);
                    812: }
                    813:
                    814: /*
1.3       pk        815:  * Return resource to the pool; must be called at appropriate spl level
1.1       pk        816:  */
1.3       pk        817: void
                    818: _pool_put(pp, v, file, line)
                    819:        struct pool *pp;
                    820:        void *v;
                    821:        const char *file;
                    822:        long line;
1.1       pk        823: {
                    824:        struct pool_item *pi = v;
1.3       pk        825:        struct pool_item_header *ph;
                    826:        caddr_t page;
1.21      thorpej   827:        int s;
1.3       pk        828:
                    829:        page = (caddr_t)((u_long)v & pp->pr_pagemask);
1.1       pk        830:
1.21      thorpej   831:        simple_lock(&pp->pr_slock);
1.25      thorpej   832:        pr_enter(pp, file, line);
1.30    ! thorpej   833:
        !           834: #ifdef DIAGNOSTIC
        !           835:        if (pp->pr_nout == 0) {
        !           836:                printf("pool %s: putting with none out\n",
        !           837:                    pp->pr_wchan);
        !           838:                panic("pool_put");
        !           839:        }
        !           840: #endif
1.3       pk        841:
                    842:        pr_log(pp, v, PRLOG_PUT, file, line);
                    843:
                    844:        if ((ph = pr_find_pagehead(pp, page)) == NULL) {
1.25      thorpej   845:                pr_printlog(pp, NULL, printf);
1.3       pk        846:                panic("pool_put: %s: page header missing", pp->pr_wchan);
                    847:        }
1.28      thorpej   848:
                    849: #ifdef LOCKDEBUG
                    850:        /*
                    851:         * Check if we're freeing a locked simple lock.
                    852:         */
                    853:        simple_lock_freecheck((caddr_t)pi, ((caddr_t)pi) + pp->pr_size);
                    854: #endif
1.3       pk        855:
                    856:        /*
                    857:         * Return to item list.
                    858:         */
1.2       pk        859: #ifdef DIAGNOSTIC
1.25      thorpej   860:        /* XXX Should fill the item. */
1.3       pk        861:        pi->pi_magic = PI_MAGIC;
                    862: #endif
                    863:        TAILQ_INSERT_HEAD(&ph->ph_itemlist, pi, pi_list);
                    864:        ph->ph_nmissing--;
                    865:        pp->pr_nput++;
1.20      thorpej   866:        pp->pr_nitems++;
                    867:        pp->pr_nout--;
1.3       pk        868:
                    869:        /* Cancel "pool empty" condition if it exists */
                    870:        if (pp->pr_curpage == NULL)
                    871:                pp->pr_curpage = ph;
                    872:
                    873:        if (pp->pr_flags & PR_WANTED) {
                    874:                pp->pr_flags &= ~PR_WANTED;
1.15      pk        875:                if (ph->ph_nmissing == 0)
                    876:                        pp->pr_nidle++;
1.25      thorpej   877:                pr_leave(pp);
1.21      thorpej   878:                simple_unlock(&pp->pr_slock);
1.3       pk        879:                wakeup((caddr_t)pp);
                    880:                return;
                    881:        }
                    882:
                    883:        /*
1.21      thorpej   884:         * If this page is now complete, do one of two things:
                    885:         *
                    886:         *      (1) If we have more pages than the page high water
                    887:         *          mark, free the page back to the system.
                    888:         *
                    889:         *      (2) Move it to the end of the page list, so that
                    890:         *          we minimize our chances of fragmenting the
                    891:         *          pool.  Idle pages migrate to the end (along with
                    892:         *          completely empty pages, so that we find un-empty
                    893:         *          pages more quickly when we update curpage) of the
                    894:         *          list so they can be more easily swept up by
                    895:         *          the pagedaemon when pages are scarce.
1.3       pk        896:         */
                    897:        if (ph->ph_nmissing == 0) {
1.6       thorpej   898:                pp->pr_nidle++;
1.3       pk        899:                if (pp->pr_npages > pp->pr_maxpages) {
                    900:                        pr_rmpage(pp, ph);
                    901:                } else {
                    902:                        TAILQ_REMOVE(&pp->pr_pagelist, ph, ph_pagelist);
                    903:                        TAILQ_INSERT_TAIL(&pp->pr_pagelist, ph, ph_pagelist);
                    904:
1.21      thorpej   905:                        /*
                    906:                         * Update the timestamp on the page.  A page must
                    907:                         * be idle for some period of time before it can
                    908:                         * be reclaimed by the pagedaemon.  This minimizes
                    909:                         * ping-pong'ing for memory.
                    910:                         */
                    911:                        s = splclock();
                    912:                        ph->ph_time = mono_time;
                    913:                        splx(s);
                    914:
                    915:                        /*
                    916:                         * Update the current page pointer.  Just look for
                    917:                         * the first page with any free items.
                    918:                         *
                    919:                         * XXX: Maybe we want an option to look for the
                    920:                         * page with the fewest available items, to minimize
                    921:                         * fragmentation?
                    922:                         */
1.3       pk        923:                        for (ph = TAILQ_FIRST(&pp->pr_pagelist); ph != NULL;
                    924:                             ph = TAILQ_NEXT(ph, ph_pagelist))
                    925:                                if (TAILQ_FIRST(&ph->ph_itemlist) != NULL)
                    926:                                        break;
1.1       pk        927:
1.3       pk        928:                        pp->pr_curpage = ph;
1.1       pk        929:                }
                    930:        }
1.21      thorpej   931:        /*
                    932:         * If the page has just become un-empty, move it to the head of
                    933:         * the list, and make it the current page.  The next allocation
                    934:         * will get the item from this page, instead of further fragmenting
                    935:         * the pool.
                    936:         */
                    937:        else if (ph->ph_nmissing == (pp->pr_itemsperpage - 1)) {
                    938:                TAILQ_REMOVE(&pp->pr_pagelist, ph, ph_pagelist);
                    939:                TAILQ_INSERT_HEAD(&pp->pr_pagelist, ph, ph_pagelist);
                    940:                pp->pr_curpage = ph;
                    941:        }
                    942:
1.25      thorpej   943:        pr_leave(pp);
1.21      thorpej   944:        simple_unlock(&pp->pr_slock);
1.3       pk        945:
1.1       pk        946: }
                    947:
                    948: /*
1.3       pk        949:  * Add N items to the pool.
1.1       pk        950:  */
                    951: int
1.2       pk        952: pool_prime(pp, n, storage)
1.1       pk        953:        struct pool *pp;
                    954:        int n;
1.2       pk        955:        caddr_t storage;
1.1       pk        956: {
1.3       pk        957:        caddr_t cp;
                    958:        int newnitems, newpages;
1.2       pk        959:
                    960: #ifdef DIAGNOSTIC
1.20      thorpej   961:        if (storage && !(pp->pr_roflags & PR_STATIC))
1.2       pk        962:                panic("pool_prime: static");
                    963:        /* !storage && static caught below */
                    964: #endif
1.1       pk        965:
1.21      thorpej   966:        simple_lock(&pp->pr_slock);
                    967:
1.3       pk        968:        newnitems = pp->pr_minitems + n;
                    969:        newpages =
1.18      thorpej   970:                roundup(newnitems, pp->pr_itemsperpage) / pp->pr_itemsperpage
1.3       pk        971:                - pp->pr_minpages;
                    972:
                    973:        while (newpages-- > 0) {
1.20      thorpej   974:                if (pp->pr_roflags & PR_STATIC) {
1.3       pk        975:                        cp = storage;
                    976:                        storage += pp->pr_pagesz;
                    977:                } else {
1.21      thorpej   978:                        simple_unlock(&pp->pr_slock);
1.3       pk        979:                        cp = (*pp->pr_alloc)(pp->pr_pagesz, 0, pp->pr_mtype);
1.21      thorpej   980:                        simple_lock(&pp->pr_slock);
1.3       pk        981:                }
1.2       pk        982:
1.3       pk        983:                if (cp == NULL) {
1.21      thorpej   984:                        simple_unlock(&pp->pr_slock);
1.1       pk        985:                        return (ENOMEM);
                    986:                }
                    987:
1.26      thorpej   988:                pp->pr_npagealloc++;
1.3       pk        989:                pool_prime_page(pp, cp);
                    990:                pp->pr_minpages++;
1.1       pk        991:        }
1.3       pk        992:
                    993:        pp->pr_minitems = newnitems;
                    994:
                    995:        if (pp->pr_minpages >= pp->pr_maxpages)
                    996:                pp->pr_maxpages = pp->pr_minpages + 1;  /* XXX */
                    997:
1.21      thorpej   998:        simple_unlock(&pp->pr_slock);
1.1       pk        999:        return (0);
                   1000: }
1.3       pk       1001:
                   1002: /*
                   1003:  * Add a page worth of items to the pool.
1.21      thorpej  1004:  *
                   1005:  * Note, we must be called with the pool descriptor LOCKED.
1.3       pk       1006:  */
1.21      thorpej  1007: static void
1.3       pk       1008: pool_prime_page(pp, storage)
                   1009:        struct pool *pp;
                   1010:        caddr_t storage;
                   1011: {
                   1012:        struct pool_item *pi;
                   1013:        struct pool_item_header *ph;
                   1014:        caddr_t cp = storage;
                   1015:        unsigned int align = pp->pr_align;
                   1016:        unsigned int ioff = pp->pr_itemoffset;
1.27      pk       1017:        int s, n;
1.3       pk       1018:
1.20      thorpej  1019:        if ((pp->pr_roflags & PR_PHINPAGE) != 0) {
1.3       pk       1020:                ph = (struct pool_item_header *)(cp + pp->pr_phoffset);
                   1021:        } else {
1.27      pk       1022:                s = splhigh();
1.3       pk       1023:                ph = pool_get(&phpool, PR_URGENT);
1.27      pk       1024:                splx(s);
1.3       pk       1025:                LIST_INSERT_HEAD(&pp->pr_hashtab[PR_HASH_INDEX(pp, cp)],
                   1026:                                 ph, ph_hashlist);
                   1027:        }
                   1028:
                   1029:        /*
                   1030:         * Insert page header.
                   1031:         */
                   1032:        TAILQ_INSERT_HEAD(&pp->pr_pagelist, ph, ph_pagelist);
                   1033:        TAILQ_INIT(&ph->ph_itemlist);
                   1034:        ph->ph_page = storage;
                   1035:        ph->ph_nmissing = 0;
1.21      thorpej  1036:        memset(&ph->ph_time, 0, sizeof(ph->ph_time));
1.3       pk       1037:
1.6       thorpej  1038:        pp->pr_nidle++;
                   1039:
1.3       pk       1040:        /*
                   1041:         * Color this page.
                   1042:         */
                   1043:        cp = (caddr_t)(cp + pp->pr_curcolor);
                   1044:        if ((pp->pr_curcolor += align) > pp->pr_maxcolor)
                   1045:                pp->pr_curcolor = 0;
                   1046:
                   1047:        /*
                   1048:         * Adjust storage to apply aligment to `pr_itemoffset' in each item.
                   1049:         */
                   1050:        if (ioff != 0)
                   1051:                cp = (caddr_t)(cp + (align - ioff));
                   1052:
                   1053:        /*
                   1054:         * Insert remaining chunks on the bucket list.
                   1055:         */
                   1056:        n = pp->pr_itemsperpage;
1.20      thorpej  1057:        pp->pr_nitems += n;
1.3       pk       1058:
                   1059:        while (n--) {
                   1060:                pi = (struct pool_item *)cp;
                   1061:
                   1062:                /* Insert on page list */
                   1063:                TAILQ_INSERT_TAIL(&ph->ph_itemlist, pi, pi_list);
                   1064: #ifdef DIAGNOSTIC
                   1065:                pi->pi_magic = PI_MAGIC;
                   1066: #endif
                   1067:                cp = (caddr_t)(cp + pp->pr_size);
                   1068:        }
                   1069:
                   1070:        /*
                   1071:         * If the pool was depleted, point at the new page.
                   1072:         */
                   1073:        if (pp->pr_curpage == NULL)
                   1074:                pp->pr_curpage = ph;
                   1075:
                   1076:        if (++pp->pr_npages > pp->pr_hiwat)
                   1077:                pp->pr_hiwat = pp->pr_npages;
                   1078: }
                   1079:
1.20      thorpej  1080: /*
                   1081:  * Like pool_prime(), except this is used by pool_get() when nitems
                   1082:  * drops below the low water mark.  This is used to catch up nitmes
                   1083:  * with the low water mark.
                   1084:  *
1.21      thorpej  1085:  * Note 1, we never wait for memory here, we let the caller decide what to do.
1.20      thorpej  1086:  *
                   1087:  * Note 2, this doesn't work with static pools.
                   1088:  *
                   1089:  * Note 3, we must be called with the pool already locked, and we return
                   1090:  * with it locked.
                   1091:  */
                   1092: static int
                   1093: pool_catchup(pp)
                   1094:        struct pool *pp;
                   1095: {
                   1096:        caddr_t cp;
                   1097:        int error = 0;
                   1098:
                   1099:        if (pp->pr_roflags & PR_STATIC) {
                   1100:                /*
                   1101:                 * We dropped below the low water mark, and this is not a
                   1102:                 * good thing.  Log a warning.
1.21      thorpej  1103:                 *
                   1104:                 * XXX: rate-limit this?
1.20      thorpej  1105:                 */
                   1106:                printf("WARNING: static pool `%s' dropped below low water "
                   1107:                    "mark\n", pp->pr_wchan);
                   1108:                return (0);
                   1109:        }
                   1110:
1.21      thorpej  1111:        while (pp->pr_nitems < pp->pr_minitems) {
1.20      thorpej  1112:                /*
1.21      thorpej  1113:                 * Call the page back-end allocator for more memory.
                   1114:                 *
                   1115:                 * XXX: We never wait, so should we bother unlocking
                   1116:                 * the pool descriptor?
1.20      thorpej  1117:                 */
1.21      thorpej  1118:                simple_unlock(&pp->pr_slock);
1.20      thorpej  1119:                cp = (*pp->pr_alloc)(pp->pr_pagesz, 0, pp->pr_mtype);
1.21      thorpej  1120:                simple_lock(&pp->pr_slock);
1.20      thorpej  1121:                if (cp == NULL) {
                   1122:                        error = ENOMEM;
                   1123:                        break;
                   1124:                }
1.26      thorpej  1125:                pp->pr_npagealloc++;
1.20      thorpej  1126:                pool_prime_page(pp, cp);
                   1127:        }
                   1128:
                   1129:        return (error);
                   1130: }
                   1131:
1.3       pk       1132: void
                   1133: pool_setlowat(pp, n)
                   1134:        pool_handle_t   pp;
                   1135:        int n;
                   1136: {
1.20      thorpej  1137:        int error;
1.15      pk       1138:
1.21      thorpej  1139:        simple_lock(&pp->pr_slock);
                   1140:
1.3       pk       1141:        pp->pr_minitems = n;
1.15      pk       1142:        pp->pr_minpages = (n == 0)
                   1143:                ? 0
1.18      thorpej  1144:                : roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage;
1.20      thorpej  1145:
                   1146:        /* Make sure we're caught up with the newly-set low water mark. */
1.21      thorpej  1147:        if ((error = pool_catchup(pp)) != 0) {
1.20      thorpej  1148:                /*
                   1149:                 * XXX: Should we log a warning?  Should we set up a timeout
                   1150:                 * to try again in a second or so?  The latter could break
                   1151:                 * a caller's assumptions about interrupt protection, etc.
                   1152:                 */
                   1153:        }
1.21      thorpej  1154:
                   1155:        simple_unlock(&pp->pr_slock);
1.3       pk       1156: }
                   1157:
                   1158: void
                   1159: pool_sethiwat(pp, n)
                   1160:        pool_handle_t   pp;
                   1161:        int n;
                   1162: {
1.15      pk       1163:
1.21      thorpej  1164:        simple_lock(&pp->pr_slock);
                   1165:
1.15      pk       1166:        pp->pr_maxpages = (n == 0)
                   1167:                ? 0
1.18      thorpej  1168:                : roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage;
1.21      thorpej  1169:
                   1170:        simple_unlock(&pp->pr_slock);
1.3       pk       1171: }
                   1172:
1.20      thorpej  1173: void
                   1174: pool_sethardlimit(pp, n, warnmess, ratecap)
                   1175:        pool_handle_t pp;
                   1176:        int n;
                   1177:        const char *warnmess;
                   1178:        int ratecap;
                   1179: {
                   1180:
1.21      thorpej  1181:        simple_lock(&pp->pr_slock);
1.20      thorpej  1182:
                   1183:        pp->pr_hardlimit = n;
                   1184:        pp->pr_hardlimit_warning = warnmess;
                   1185:        pp->pr_hardlimit_ratecap = ratecap;
                   1186:        memset(&pp->pr_hardlimit_warning_last, 0,
                   1187:            sizeof(pp->pr_hardlimit_warning_last));
                   1188:
                   1189:        /*
1.21      thorpej  1190:         * In-line version of pool_sethiwat(), because we don't want to
                   1191:         * release the lock.
1.20      thorpej  1192:         */
                   1193:        pp->pr_maxpages = (n == 0)
                   1194:                ? 0
                   1195:                : roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage;
1.21      thorpej  1196:
                   1197:        simple_unlock(&pp->pr_slock);
1.20      thorpej  1198: }
1.3       pk       1199:
                   1200: /*
                   1201:  * Default page allocator.
                   1202:  */
                   1203: static void *
                   1204: pool_page_alloc(sz, flags, mtype)
                   1205:        unsigned long sz;
                   1206:        int flags;
                   1207:        int mtype;
                   1208: {
1.11      thorpej  1209:        boolean_t waitok = (flags & PR_WAITOK) ? TRUE : FALSE;
1.3       pk       1210:
1.11      thorpej  1211:        return ((void *)uvm_km_alloc_poolpage(waitok));
1.3       pk       1212: }
                   1213:
                   1214: static void
                   1215: pool_page_free(v, sz, mtype)
                   1216:        void *v;
                   1217:        unsigned long sz;
                   1218:        int mtype;
                   1219: {
                   1220:
1.10      eeh      1221:        uvm_km_free_poolpage((vaddr_t)v);
1.3       pk       1222: }
1.12      thorpej  1223:
                   1224: /*
                   1225:  * Alternate pool page allocator for pools that know they will
                   1226:  * never be accessed in interrupt context.
                   1227:  */
                   1228: void *
                   1229: pool_page_alloc_nointr(sz, flags, mtype)
                   1230:        unsigned long sz;
                   1231:        int flags;
                   1232:        int mtype;
                   1233: {
                   1234:        boolean_t waitok = (flags & PR_WAITOK) ? TRUE : FALSE;
                   1235:
                   1236:        return ((void *)uvm_km_alloc_poolpage1(kernel_map, uvm.kernel_object,
                   1237:            waitok));
                   1238: }
                   1239:
                   1240: void
                   1241: pool_page_free_nointr(v, sz, mtype)
                   1242:        void *v;
                   1243:        unsigned long sz;
                   1244:        int mtype;
                   1245: {
                   1246:
                   1247:        uvm_km_free_poolpage1(kernel_map, (vaddr_t)v);
                   1248: }
                   1249:
1.3       pk       1250:
                   1251: /*
                   1252:  * Release all complete pages that have not been used recently.
                   1253:  */
                   1254: void
1.25      thorpej  1255: _pool_reclaim(pp, file, line)
1.3       pk       1256:        pool_handle_t pp;
1.25      thorpej  1257:        const char *file;
                   1258:        long line;
1.3       pk       1259: {
                   1260:        struct pool_item_header *ph, *phnext;
1.21      thorpej  1261:        struct timeval curtime;
                   1262:        int s;
1.3       pk       1263:
1.20      thorpej  1264:        if (pp->pr_roflags & PR_STATIC)
1.3       pk       1265:                return;
                   1266:
1.21      thorpej  1267:        if (simple_lock_try(&pp->pr_slock) == 0)
1.3       pk       1268:                return;
1.25      thorpej  1269:        pr_enter(pp, file, line);
1.3       pk       1270:
1.21      thorpej  1271:        s = splclock();
                   1272:        curtime = mono_time;
                   1273:        splx(s);
                   1274:
1.3       pk       1275:        for (ph = TAILQ_FIRST(&pp->pr_pagelist); ph != NULL; ph = phnext) {
                   1276:                phnext = TAILQ_NEXT(ph, ph_pagelist);
                   1277:
                   1278:                /* Check our minimum page claim */
                   1279:                if (pp->pr_npages <= pp->pr_minpages)
                   1280:                        break;
                   1281:
                   1282:                if (ph->ph_nmissing == 0) {
                   1283:                        struct timeval diff;
                   1284:                        timersub(&curtime, &ph->ph_time, &diff);
                   1285:                        if (diff.tv_sec < pool_inactive_time)
                   1286:                                continue;
1.21      thorpej  1287:
                   1288:                        /*
                   1289:                         * If freeing this page would put us below
                   1290:                         * the low water mark, stop now.
                   1291:                         */
                   1292:                        if ((pp->pr_nitems - pp->pr_itemsperpage) <
                   1293:                            pp->pr_minitems)
                   1294:                                break;
                   1295:
1.3       pk       1296:                        pr_rmpage(pp, ph);
                   1297:                }
                   1298:        }
                   1299:
1.25      thorpej  1300:        pr_leave(pp);
1.21      thorpej  1301:        simple_unlock(&pp->pr_slock);
1.3       pk       1302: }
                   1303:
                   1304:
                   1305: /*
                   1306:  * Drain pools, one at a time.
1.21      thorpej  1307:  *
                   1308:  * Note, we must never be called from an interrupt context.
1.3       pk       1309:  */
                   1310: void
                   1311: pool_drain(arg)
                   1312:        void *arg;
                   1313: {
                   1314:        struct pool *pp;
1.23      thorpej  1315:        int s;
1.3       pk       1316:
1.23      thorpej  1317:        s = splimp();
                   1318:        simple_lock(&pool_head_slock);
                   1319:
                   1320:        if (drainpp == NULL && (drainpp = TAILQ_FIRST(&pool_head)) == NULL)
                   1321:                goto out;
1.3       pk       1322:
                   1323:        pp = drainpp;
                   1324:        drainpp = TAILQ_NEXT(pp, pr_poollist);
                   1325:
                   1326:        pool_reclaim(pp);
1.23      thorpej  1327:
                   1328:  out:
                   1329:        simple_unlock(&pool_head_slock);
1.3       pk       1330:        splx(s);
                   1331: }
                   1332:
                   1333:
                   1334: /*
                   1335:  * Diagnostic helpers.
                   1336:  */
                   1337: void
1.25      thorpej  1338: pool_print(pp, modif)
1.3       pk       1339:        struct pool *pp;
1.25      thorpej  1340:        const char *modif;
1.21      thorpej  1341: {
                   1342:        int s;
                   1343:
                   1344:        s = splimp();
1.25      thorpej  1345:        if (simple_lock_try(&pp->pr_slock) == 0) {
                   1346:                printf("pool %s is locked; try again later\n",
                   1347:                    pp->pr_wchan);
                   1348:                splx(s);
                   1349:                return;
                   1350:        }
                   1351:        pool_print1(pp, modif, printf);
1.21      thorpej  1352:        simple_unlock(&pp->pr_slock);
                   1353:        splx(s);
                   1354: }
                   1355:
1.25      thorpej  1356: void
                   1357: pool_printit(pp, modif, pr)
                   1358:        struct pool *pp;
                   1359:        const char *modif;
                   1360:        void (*pr) __P((const char *, ...));
                   1361: {
                   1362:        int didlock = 0;
                   1363:
                   1364:        if (pp == NULL) {
                   1365:                (*pr)("Must specify a pool to print.\n");
                   1366:                return;
                   1367:        }
                   1368:
                   1369:        /*
                   1370:         * Called from DDB; interrupts should be blocked, and all
                   1371:         * other processors should be paused.  We can skip locking
                   1372:         * the pool in this case.
                   1373:         *
                   1374:         * We do a simple_lock_try() just to print the lock
                   1375:         * status, however.
                   1376:         */
                   1377:
                   1378:        if (simple_lock_try(&pp->pr_slock) == 0)
                   1379:                (*pr)("WARNING: pool %s is locked\n", pp->pr_wchan);
                   1380:        else
                   1381:                didlock = 1;
                   1382:
                   1383:        pool_print1(pp, modif, pr);
                   1384:
                   1385:        if (didlock)
                   1386:                simple_unlock(&pp->pr_slock);
                   1387: }
                   1388:
1.21      thorpej  1389: static void
1.25      thorpej  1390: pool_print1(pp, modif, pr)
1.21      thorpej  1391:        struct pool *pp;
1.25      thorpej  1392:        const char *modif;
                   1393:        void (*pr) __P((const char *, ...));
1.3       pk       1394: {
1.25      thorpej  1395:        struct pool_item_header *ph;
                   1396: #ifdef DIAGNOSTIC
                   1397:        struct pool_item *pi;
                   1398: #endif
                   1399:        int print_log = 0, print_pagelist = 0;
                   1400:        char c;
                   1401:
                   1402:        while ((c = *modif++) != '\0') {
                   1403:                if (c == 'l')
                   1404:                        print_log = 1;
                   1405:                if (c == 'p')
                   1406:                        print_pagelist = 1;
                   1407:                modif++;
                   1408:        }
                   1409:
                   1410:        (*pr)("POOL %s: size %u, align %u, ioff %u, roflags 0x%08x\n",
                   1411:            pp->pr_wchan, pp->pr_size, pp->pr_align, pp->pr_itemoffset,
                   1412:            pp->pr_roflags);
                   1413:        (*pr)("\tpagesz %u, mtype %d\n", pp->pr_pagesz, pp->pr_mtype);
                   1414:        (*pr)("\talloc %p, release %p\n", pp->pr_alloc, pp->pr_free);
                   1415:        (*pr)("\tminitems %u, minpages %u, maxpages %u, npages %u\n",
                   1416:            pp->pr_minitems, pp->pr_minpages, pp->pr_maxpages, pp->pr_npages);
                   1417:        (*pr)("\titemsperpage %u, nitems %u, nout %u, hardlimit %u\n",
                   1418:            pp->pr_itemsperpage, pp->pr_nitems, pp->pr_nout, pp->pr_hardlimit);
                   1419:
                   1420:        (*pr)("\n\tnget %lu, nfail %lu, nput %lu\n",
                   1421:            pp->pr_nget, pp->pr_nfail, pp->pr_nput);
                   1422:        (*pr)("\tnpagealloc %lu, npagefree %lu, hiwat %u, nidle %lu\n",
                   1423:            pp->pr_npagealloc, pp->pr_npagefree, pp->pr_hiwat, pp->pr_nidle);
                   1424:
                   1425:        if (print_pagelist == 0)
                   1426:                goto skip_pagelist;
                   1427:
                   1428:        if ((ph = TAILQ_FIRST(&pp->pr_pagelist)) != NULL)
                   1429:                (*pr)("\n\tpage list:\n");
                   1430:        for (; ph != NULL; ph = TAILQ_NEXT(ph, ph_pagelist)) {
                   1431:                (*pr)("\t\tpage %p, nmissing %d, time %lu,%lu\n",
                   1432:                    ph->ph_page, ph->ph_nmissing,
                   1433:                    (u_long)ph->ph_time.tv_sec,
                   1434:                    (u_long)ph->ph_time.tv_usec);
                   1435: #ifdef DIAGNOSTIC
                   1436:                for (pi = TAILQ_FIRST(&ph->ph_itemlist); pi != NULL;
                   1437:                     pi = TAILQ_NEXT(pi, pi_list)) {
                   1438:                        if (pi->pi_magic != PI_MAGIC) {
                   1439:                                (*pr)("\t\t\titem %p, magic 0x%x\n",
                   1440:                                    pi, pi->pi_magic);
                   1441:                        }
                   1442:                }
                   1443: #endif
                   1444:        }
                   1445:        if (pp->pr_curpage == NULL)
                   1446:                (*pr)("\tno current page\n");
                   1447:        else
                   1448:                (*pr)("\tcurpage %p\n", pp->pr_curpage->ph_page);
                   1449:
                   1450:  skip_pagelist:
                   1451:
                   1452:        if (print_log == 0)
                   1453:                goto skip_log;
                   1454:
                   1455:        (*pr)("\n");
                   1456:        if ((pp->pr_roflags & PR_LOGGING) == 0)
                   1457:                (*pr)("\tno log\n");
                   1458:        else
                   1459:                pr_printlog(pp, NULL, pr);
1.3       pk       1460:
1.25      thorpej  1461:  skip_log:
1.3       pk       1462:
1.25      thorpej  1463:        pr_enter_check(pp, pr);
1.3       pk       1464: }
                   1465:
                   1466: int
                   1467: pool_chk(pp, label)
                   1468:        struct pool *pp;
                   1469:        char *label;
                   1470: {
                   1471:        struct pool_item_header *ph;
                   1472:        int r = 0;
                   1473:
1.21      thorpej  1474:        simple_lock(&pp->pr_slock);
1.3       pk       1475:
                   1476:        for (ph = TAILQ_FIRST(&pp->pr_pagelist); ph != NULL;
                   1477:             ph = TAILQ_NEXT(ph, ph_pagelist)) {
                   1478:
                   1479:                struct pool_item *pi;
                   1480:                int n;
                   1481:                caddr_t page;
                   1482:
                   1483:                page = (caddr_t)((u_long)ph & pp->pr_pagemask);
1.20      thorpej  1484:                if (page != ph->ph_page &&
                   1485:                    (pp->pr_roflags & PR_PHINPAGE) != 0) {
1.3       pk       1486:                        if (label != NULL)
                   1487:                                printf("%s: ", label);
1.16      briggs   1488:                        printf("pool(%p:%s): page inconsistency: page %p;"
                   1489:                               " at page head addr %p (p %p)\n", pp,
1.3       pk       1490:                                pp->pr_wchan, ph->ph_page,
                   1491:                                ph, page);
                   1492:                        r++;
                   1493:                        goto out;
                   1494:                }
                   1495:
                   1496:                for (pi = TAILQ_FIRST(&ph->ph_itemlist), n = 0;
                   1497:                     pi != NULL;
                   1498:                     pi = TAILQ_NEXT(pi,pi_list), n++) {
                   1499:
                   1500: #ifdef DIAGNOSTIC
                   1501:                        if (pi->pi_magic != PI_MAGIC) {
                   1502:                                if (label != NULL)
                   1503:                                        printf("%s: ", label);
                   1504:                                printf("pool(%s): free list modified: magic=%x;"
                   1505:                                       " page %p; item ordinal %d;"
                   1506:                                       " addr %p (p %p)\n",
                   1507:                                        pp->pr_wchan, pi->pi_magic, ph->ph_page,
                   1508:                                        n, pi, page);
                   1509:                                panic("pool");
                   1510:                        }
                   1511: #endif
                   1512:                        page = (caddr_t)((u_long)pi & pp->pr_pagemask);
                   1513:                        if (page == ph->ph_page)
                   1514:                                continue;
                   1515:
                   1516:                        if (label != NULL)
                   1517:                                printf("%s: ", label);
1.16      briggs   1518:                        printf("pool(%p:%s): page inconsistency: page %p;"
                   1519:                               " item ordinal %d; addr %p (p %p)\n", pp,
1.3       pk       1520:                                pp->pr_wchan, ph->ph_page,
                   1521:                                n, pi, page);
                   1522:                        r++;
                   1523:                        goto out;
                   1524:                }
                   1525:        }
                   1526: out:
1.21      thorpej  1527:        simple_unlock(&pp->pr_slock);
1.3       pk       1528:        return (r);
                   1529: }

CVSweb <webmaster@jp.NetBSD.org>