/* $OpenBSD: subr_pool.c,v 1.51 2007/04/23 09:27:59 art Exp $ */ /* $NetBSD: subr_pool.c,v 1.61 2001/09/26 07:14:56 chs Exp $ */ /*- * Copyright (c) 1997, 1999, 2000 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Paul Kranenburg; by Jason R. Thorpe of the Numerical Aerospace * Simulation Facility, NASA Ames Research Center. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include #include #include /* * XXX - for now. */ #ifdef LOCKDEBUG #define simple_lock_freecheck(a, s) do { /* nothing */ } while (0) #define simple_lock_only_held(lkp, str) do { /* nothing */ } while (0) #endif /* * Pool resource management utility. * * Memory is allocated in pages which are split into pieces according to * the pool item size. Each page is kept on one of three lists in the * pool structure: `pr_emptypages', `pr_fullpages' and `pr_partpages', * for empty, full and partially-full pages respectively. The individual * pool items are on a linked list headed by `ph_itemlist' in each page * header. The memory for building the page list is either taken from * the allocated pages themselves (for small pool items) or taken from * an internal pool of page headers (`phpool'). */ /* List of all pools */ TAILQ_HEAD(,pool) pool_head = TAILQ_HEAD_INITIALIZER(pool_head); /* Private pool for page header structures */ static struct pool phpool; /* # of seconds to retain page after last use */ int pool_inactive_time = 10; /* This spin lock protects both pool_head */ struct simplelock pool_head_slock; struct pool_item_header { /* Page headers */ LIST_ENTRY(pool_item_header) ph_pagelist; /* pool page list */ TAILQ_HEAD(,pool_item) ph_itemlist; /* chunk list for this page */ SPLAY_ENTRY(pool_item_header) ph_node; /* Off-page page headers */ int ph_nmissing; /* # of chunks in use */ caddr_t ph_page; /* this page's address */ struct timeval ph_time; /* last referenced */ }; struct pool_item { #ifdef DIAGNOSTIC int pi_magic; #endif #ifdef DEADBEEF1 #define PI_MAGIC DEADBEEF1 #else #define PI_MAGIC 0xdeafbeef #endif /* Other entries use only this list entry */ TAILQ_ENTRY(pool_item) pi_list; }; #define POOL_NEEDS_CATCHUP(pp) \ ((pp)->pr_nitems < (pp)->pr_minitems) /* * Every pool gets a unique serial number assigned to it. If this counter * wraps, we're screwed, but we shouldn't create so many pools anyway. */ unsigned int pool_serial; /* * Pool cache management. * * Pool caches provide a way for constructed objects to be cached by the * pool subsystem. This can lead to performance improvements by avoiding * needless object construction/destruction; it is deferred until absolutely * necessary. * * Caches are grouped into cache groups. Each cache group references * up to 16 constructed objects. When a cache allocates an object * from the pool, it calls the object's constructor and places it into * a cache group. When a cache group frees an object back to the pool, * it first calls the object's destructor. This allows the object to * persist in constructed form while freed to the cache. * * Multiple caches may exist for each pool. This allows a single * object type to have multiple constructed forms. The pool references * each cache, so that when a pool is drained by the pagedaemon, it can * drain each individual cache as well. Each time a cache is drained, * the most idle cache group is freed to the pool in its entirety. * * Pool caches are layed on top of pools. By layering them, we can avoid * the complexity of cache management for pools which would not benefit * from it. */ /* The cache group pool. */ static struct pool pcgpool; /* The pool cache group. */ #define PCG_NOBJECTS 16 struct pool_cache_group { TAILQ_ENTRY(pool_cache_group) pcg_list; /* link in the pool cache's group list */ u_int pcg_avail; /* # available objects */ /* pointers to the objects */ void *pcg_objects[PCG_NOBJECTS]; }; void pool_cache_reclaim(struct pool_cache *); void pool_cache_do_invalidate(struct pool_cache *, int, void (*)(struct pool *, void *)); int pool_catchup(struct pool *); void pool_prime_page(struct pool *, caddr_t, struct pool_item_header *); void pool_update_curpage(struct pool *); void pool_do_put(struct pool *, void *); void pr_rmpage(struct pool *, struct pool_item_header *, struct pool_pagelist *); int pool_chk_page(struct pool *, const char *, struct pool_item_header *); void *pool_allocator_alloc(struct pool *, int); void pool_allocator_free(struct pool *, void *); #ifdef DDB void pool_print_pagelist(struct pool_pagelist *, int (*)(const char *, ...)); void pool_print1(struct pool *, const char *, int (*)(const char *, ...)); #endif /* * Pool log entry. An array of these is allocated in pool_init(). */ struct pool_log { const char *pl_file; long pl_line; int pl_action; #define PRLOG_GET 1 #define PRLOG_PUT 2 void *pl_addr; }; /* Number of entries in pool log buffers */ #ifndef POOL_LOGSIZE #define POOL_LOGSIZE 10 #endif int pool_logsize = POOL_LOGSIZE; #ifdef POOL_DIAGNOSTIC static __inline void pr_log(struct pool *pp, void *v, int action, const char *file, long line) { int n = pp->pr_curlogentry; struct pool_log *pl; if ((pp->pr_roflags & PR_LOGGING) == 0) return; /* * Fill in the current entry. Wrap around and overwrite * the oldest entry if necessary. */ pl = &pp->pr_log[n]; pl->pl_file = file; pl->pl_line = line; pl->pl_action = action; pl->pl_addr = v; if (++n >= pp->pr_logsize) n = 0; pp->pr_curlogentry = n; } static void pr_printlog(struct pool *pp, struct pool_item *pi, int (*pr)(const char *, ...)) { int i = pp->pr_logsize; int n = pp->pr_curlogentry; if ((pp->pr_roflags & PR_LOGGING) == 0) return; /* * Print all entries in this pool's log. */ while (i-- > 0) { struct pool_log *pl = &pp->pr_log[n]; if (pl->pl_action != 0) { if (pi == NULL || pi == pl->pl_addr) { (*pr)("\tlog entry %d:\n", i); (*pr)("\t\taction = %s, addr = %p\n", pl->pl_action == PRLOG_GET ? "get" : "put", pl->pl_addr); (*pr)("\t\tfile: %s at line %lu\n", pl->pl_file, pl->pl_line); } } if (++n >= pp->pr_logsize) n = 0; } } static __inline void pr_enter(struct pool *pp, const char *file, long line) { if (__predict_false(pp->pr_entered_file != NULL)) { printf("pool %s: reentrancy at file %s line %ld\n", pp->pr_wchan, file, line); printf(" previous entry at file %s line %ld\n", pp->pr_entered_file, pp->pr_entered_line); panic("pr_enter"); } pp->pr_entered_file = file; pp->pr_entered_line = line; } static __inline void pr_leave(struct pool *pp) { if (__predict_false(pp->pr_entered_file == NULL)) { printf("pool %s not entered?\n", pp->pr_wchan); panic("pr_leave"); } pp->pr_entered_file = NULL; pp->pr_entered_line = 0; } static __inline void pr_enter_check(struct pool *pp, int (*pr)(const char *, ...)) { if (pp->pr_entered_file != NULL) (*pr)("\n\tcurrently entered from file %s line %ld\n", pp->pr_entered_file, pp->pr_entered_line); } #else #define pr_log(pp, v, action, file, line) #define pr_printlog(pp, pi, pr) #define pr_enter(pp, file, line) #define pr_leave(pp) #define pr_enter_check(pp, pr) #endif /* POOL_DIAGNOSTIC */ static __inline int phtree_compare(struct pool_item_header *a, struct pool_item_header *b) { if (a->ph_page < b->ph_page) return (-1); else if (a->ph_page > b->ph_page) return (1); else return (0); } SPLAY_PROTOTYPE(phtree, pool_item_header, ph_node, phtree_compare); SPLAY_GENERATE(phtree, pool_item_header, ph_node, phtree_compare); /* * Return the pool page header based on page address. */ static __inline struct pool_item_header * pr_find_pagehead(struct pool *pp, caddr_t page) { struct pool_item_header *ph, tmp; if ((pp->pr_roflags & PR_PHINPAGE) != 0) return ((struct pool_item_header *)(page + pp->pr_phoffset)); tmp.ph_page = page; ph = SPLAY_FIND(phtree, &pp->pr_phtree, &tmp); return ph; } /* * Remove a page from the pool. */ void pr_rmpage(struct pool *pp, struct pool_item_header *ph, struct pool_pagelist *pq) { int s; /* * If the page was idle, decrement the idle page count. */ if (ph->ph_nmissing == 0) { #ifdef DIAGNOSTIC if (pp->pr_nidle == 0) panic("pr_rmpage: nidle inconsistent"); if (pp->pr_nitems < pp->pr_itemsperpage) panic("pr_rmpage: nitems inconsistent"); #endif pp->pr_nidle--; } pp->pr_nitems -= pp->pr_itemsperpage; /* * Unlink a page from the pool and release it (or queue it for release). */ LIST_REMOVE(ph, ph_pagelist); if (pq) { LIST_INSERT_HEAD(pq, ph, ph_pagelist); } else { pool_allocator_free(pp, ph->ph_page); if ((pp->pr_roflags & PR_PHINPAGE) == 0) { SPLAY_REMOVE(phtree, &pp->pr_phtree, ph); s = splhigh(); pool_put(&phpool, ph); splx(s); } } pp->pr_npages--; pp->pr_npagefree++; pool_update_curpage(pp); } /* * Initialize the given pool resource structure. * * We export this routine to allow other kernel parts to declare * static pools that must be initialized before malloc() is available. */ void pool_init(struct pool *pp, size_t size, u_int align, u_int ioff, int flags, const char *wchan, struct pool_allocator *palloc) { int off, slack; #ifdef POOL_DIAGNOSTIC /* * Always log if POOL_DIAGNOSTIC is defined. */ if (pool_logsize != 0) flags |= PR_LOGGING; #endif #ifdef MALLOC_DEBUG if ((flags & PR_DEBUG) && (ioff != 0 || align != 0)) flags &= ~PR_DEBUG; #endif /* * Check arguments and construct default values. */ if (palloc == NULL) palloc = &pool_allocator_nointr; if ((palloc->pa_flags & PA_INITIALIZED) == 0) { if (palloc->pa_pagesz == 0) palloc->pa_pagesz = PAGE_SIZE; TAILQ_INIT(&palloc->pa_list); simple_lock_init(&palloc->pa_slock); palloc->pa_pagemask = ~(palloc->pa_pagesz - 1); palloc->pa_pageshift = ffs(palloc->pa_pagesz) - 1; palloc->pa_flags |= PA_INITIALIZED; } if (align == 0) align = ALIGN(1); if (size < sizeof(struct pool_item)) size = sizeof(struct pool_item); size = roundup(size, align); #ifdef DIAGNOSTIC if (size > palloc->pa_pagesz) panic("pool_init: pool item size (%lu) too large", (u_long)size); #endif /* * Initialize the pool structure. */ LIST_INIT(&pp->pr_emptypages); LIST_INIT(&pp->pr_fullpages); LIST_INIT(&pp->pr_partpages); TAILQ_INIT(&pp->pr_cachelist); pp->pr_curpage = NULL; pp->pr_npages = 0; pp->pr_minitems = 0; pp->pr_minpages = 0; pp->pr_maxpages = 8; pp->pr_roflags = flags; pp->pr_flags = 0; pp->pr_size = size; pp->pr_align = align; pp->pr_wchan = wchan; pp->pr_alloc = palloc; pp->pr_nitems = 0; pp->pr_nout = 0; pp->pr_hardlimit = UINT_MAX; pp->pr_hardlimit_warning = NULL; pp->pr_hardlimit_ratecap.tv_sec = 0; pp->pr_hardlimit_ratecap.tv_usec = 0; pp->pr_hardlimit_warning_last.tv_sec = 0; pp->pr_hardlimit_warning_last.tv_usec = 0; pp->pr_serial = ++pool_serial; if (pool_serial == 0) panic("pool_init: too much uptime"); /* * Decide whether to put the page header off page to avoid * wasting too large a part of the page. Off-page page headers * go on a hash table, so we can match a returned item * with its header based on the page address. * We use 1/16 of the page size as the threshold (XXX: tune) */ if (pp->pr_size < palloc->pa_pagesz/16) { /* Use the end of the page for the page header */ pp->pr_roflags |= PR_PHINPAGE; pp->pr_phoffset = off = palloc->pa_pagesz - ALIGN(sizeof(struct pool_item_header)); } else { /* The page header will be taken from our page header pool */ pp->pr_phoffset = 0; off = palloc->pa_pagesz; SPLAY_INIT(&pp->pr_phtree); } /* * Alignment is to take place at `ioff' within the item. This means * we must reserve up to `align - 1' bytes on the page to allow * appropriate positioning of each item. * * Silently enforce `0 <= ioff < align'. */ pp->pr_itemoffset = ioff = ioff % align; pp->pr_itemsperpage = (off - ((align - ioff) % align)) / pp->pr_size; KASSERT(pp->pr_itemsperpage != 0); /* * Use the slack between the chunks and the page header * for "cache coloring". */ slack = off - pp->pr_itemsperpage * pp->pr_size; pp->pr_maxcolor = (slack / align) * align; pp->pr_curcolor = 0; pp->pr_nget = 0; pp->pr_nfail = 0; pp->pr_nput = 0; pp->pr_npagealloc = 0; pp->pr_npagefree = 0; pp->pr_hiwat = 0; pp->pr_nidle = 0; #ifdef POOL_DIAGNOSTIC if (flags & PR_LOGGING) { if (kmem_map == NULL || (pp->pr_log = malloc(pool_logsize * sizeof(struct pool_log), M_TEMP, M_NOWAIT)) == NULL) pp->pr_roflags &= ~PR_LOGGING; pp->pr_curlogentry = 0; pp->pr_logsize = pool_logsize; } #endif pp->pr_entered_file = NULL; pp->pr_entered_line = 0; simple_lock_init(&pp->pr_slock); /* * Initialize private page header pool and cache magazine pool if we * haven't done so yet. * XXX LOCKING. */ if (phpool.pr_size == 0) { pool_init(&phpool, sizeof(struct pool_item_header), 0, 0, 0, "phpool", NULL); pool_init(&pcgpool, sizeof(struct pool_cache_group), 0, 0, 0, "pcgpool", NULL); } simple_lock_init(&pool_head_slock); /* Insert this into the list of all pools. */ simple_lock(&pool_head_slock); TAILQ_INSERT_TAIL(&pool_head, pp, pr_poollist); simple_unlock(&pool_head_slock); /* Insert into the list of pools using this allocator. */ simple_lock(&palloc->pa_slock); TAILQ_INSERT_TAIL(&palloc->pa_list, pp, pr_alloc_list); simple_unlock(&palloc->pa_slock); } /* * Decommission a pool resource. */ void pool_destroy(struct pool *pp) { struct pool_item_header *ph; struct pool_cache *pc; /* Locking order: pool_allocator -> pool */ simple_lock(&pp->pr_alloc->pa_slock); TAILQ_REMOVE(&pp->pr_alloc->pa_list, pp, pr_alloc_list); simple_unlock(&pp->pr_alloc->pa_slock); /* Destroy all caches for this pool. */ while ((pc = TAILQ_FIRST(&pp->pr_cachelist)) != NULL) pool_cache_destroy(pc); #ifdef DIAGNOSTIC if (pp->pr_nout != 0) { pr_printlog(pp, NULL, printf); panic("pool_destroy: pool busy: still out: %u", pp->pr_nout); } #endif /* Remove all pages */ while ((ph = LIST_FIRST(&pp->pr_emptypages)) != NULL) pr_rmpage(pp, ph, NULL); KASSERT(LIST_EMPTY(&pp->pr_fullpages)); KASSERT(LIST_EMPTY(&pp->pr_partpages)); /* Remove from global pool list */ simple_lock(&pool_head_slock); TAILQ_REMOVE(&pool_head, pp, pr_poollist); simple_unlock(&pool_head_slock); #ifdef POOL_DIAGNOSTIC if ((pp->pr_roflags & PR_LOGGING) != 0) free(pp->pr_log, M_TEMP); #endif } static struct pool_item_header * pool_alloc_item_header(struct pool *pp, caddr_t storage, int flags) { struct pool_item_header *ph; int s; LOCK_ASSERT(simple_lock_held(&pp->pr_slock) == 0); if ((pp->pr_roflags & PR_PHINPAGE) != 0) ph = (struct pool_item_header *) (storage + pp->pr_phoffset); else { s = splhigh(); ph = pool_get(&phpool, flags); splx(s); } return (ph); } /* * Grab an item from the pool; must be called at appropriate spl level */ void * #ifdef POOL_DIAGNOSTIC _pool_get(struct pool *pp, int flags, const char *file, long line) #else pool_get(struct pool *pp, int flags) #endif { struct pool_item *pi; struct pool_item_header *ph; void *v; #ifdef DIAGNOSTIC if ((flags & PR_WAITOK) != 0) splassert(IPL_NONE); if (__predict_false(curproc == NULL && /* doing_shutdown == 0 && XXX*/ (flags & PR_WAITOK) != 0)) panic("pool_get: %s:must have NOWAIT", pp->pr_wchan); #ifdef LOCKDEBUG if (flags & PR_WAITOK) simple_lock_only_held(NULL, "pool_get(PR_WAITOK)"); #endif #endif /* DIAGNOSTIC */ #ifdef MALLOC_DEBUG if (pp->pr_roflags & PR_DEBUG) { void *addr; addr = NULL; debug_malloc(pp->pr_size, M_DEBUG, (flags & PR_WAITOK) ? M_WAITOK : M_NOWAIT, &addr); return (addr); } #endif simple_lock(&pp->pr_slock); pr_enter(pp, file, line); startover: /* * Check to see if we've reached the hard limit. If we have, * and we can wait, then wait until an item has been returned to * the pool. */ #ifdef DIAGNOSTIC if (__predict_false(pp->pr_nout > pp->pr_hardlimit)) { pr_leave(pp); simple_unlock(&pp->pr_slock); panic("pool_get: %s: crossed hard limit", pp->pr_wchan); } #endif if (__predict_false(pp->pr_nout == pp->pr_hardlimit)) { if ((flags & PR_WAITOK) && !(flags & PR_LIMITFAIL)) { /* * XXX: A warning isn't logged in this case. Should * it be? */ pp->pr_flags |= PR_WANTED; pr_leave(pp); ltsleep(pp, PSWP, pp->pr_wchan, 0, &pp->pr_slock); pr_enter(pp, file, line); goto startover; } /* * Log a message that the hard limit has been hit. */ if (pp->pr_hardlimit_warning != NULL && ratecheck(&pp->pr_hardlimit_warning_last, &pp->pr_hardlimit_ratecap)) log(LOG_ERR, "%s\n", pp->pr_hardlimit_warning); pp->pr_nfail++; pr_leave(pp); simple_unlock(&pp->pr_slock); return (NULL); } /* * The convention we use is that if `curpage' is not NULL, then * it points at a non-empty bucket. In particular, `curpage' * never points at a page header which has PR_PHINPAGE set and * has no items in its bucket. */ if ((ph = pp->pr_curpage) == NULL) { #ifdef DIAGNOSTIC if (pp->pr_nitems != 0) { simple_unlock(&pp->pr_slock); printf("pool_get: %s: curpage NULL, nitems %u\n", pp->pr_wchan, pp->pr_nitems); panic("pool_get: nitems inconsistent"); } #endif /* * Call the back-end page allocator for more memory. * Release the pool lock, as the back-end page allocator * may block. */ pr_leave(pp); simple_unlock(&pp->pr_slock); v = pool_allocator_alloc(pp, flags); if (__predict_true(v != NULL)) ph = pool_alloc_item_header(pp, v, flags); simple_lock(&pp->pr_slock); pr_enter(pp, file, line); if (__predict_false(v == NULL || ph == NULL)) { if (v != NULL) pool_allocator_free(pp, v); /* * We were unable to allocate a page or item * header, but we released the lock during * allocation, so perhaps items were freed * back to the pool. Check for this case. */ if (pp->pr_curpage != NULL) goto startover; if ((flags & PR_WAITOK) == 0) { pp->pr_nfail++; pr_leave(pp); simple_unlock(&pp->pr_slock); return (NULL); } /* * Wait for items to be returned to this pool. * * XXX: maybe we should wake up once a second and * try again? */ pp->pr_flags |= PR_WANTED; /* PA_WANTED is already set on the allocator. */ pr_leave(pp); ltsleep(pp, PSWP, pp->pr_wchan, 0, &pp->pr_slock); pr_enter(pp, file, line); goto startover; } /* We have more memory; add it to the pool */ pool_prime_page(pp, v, ph); pp->pr_npagealloc++; /* Start the allocation process over. */ goto startover; } if (__predict_false((v = pi = TAILQ_FIRST(&ph->ph_itemlist)) == NULL)) { pr_leave(pp); simple_unlock(&pp->pr_slock); panic("pool_get: %s: page empty", pp->pr_wchan); } #ifdef DIAGNOSTIC if (__predict_false(pp->pr_nitems == 0)) { pr_leave(pp); simple_unlock(&pp->pr_slock); printf("pool_get: %s: items on itemlist, nitems %u\n", pp->pr_wchan, pp->pr_nitems); panic("pool_get: nitems inconsistent"); } #endif #ifdef POOL_DIAGNOSTIC pr_log(pp, v, PRLOG_GET, file, line); #endif #ifdef DIAGNOSTIC if (__predict_false(pi->pi_magic != PI_MAGIC)) { pr_printlog(pp, pi, printf); panic("pool_get(%s): free list modified: magic=%x; page %p;" " item addr %p", pp->pr_wchan, pi->pi_magic, ph->ph_page, pi); } #endif /* * Remove from item list. */ TAILQ_REMOVE(&ph->ph_itemlist, pi, pi_list); pp->pr_nitems--; pp->pr_nout++; if (ph->ph_nmissing == 0) { #ifdef DIAGNOSTIC if (__predict_false(pp->pr_nidle == 0)) panic("pool_get: nidle inconsistent"); #endif pp->pr_nidle--; /* * This page was previously empty. Move it to the list of * partially-full pages. This page is already curpage. */ LIST_REMOVE(ph, ph_pagelist); LIST_INSERT_HEAD(&pp->pr_partpages, ph, ph_pagelist); } ph->ph_nmissing++; if (TAILQ_EMPTY(&ph->ph_itemlist)) { #ifdef DIAGNOSTIC if (__predict_false(ph->ph_nmissing != pp->pr_itemsperpage)) { pr_leave(pp); simple_unlock(&pp->pr_slock); panic("pool_get: %s: nmissing inconsistent", pp->pr_wchan); } #endif /* * This page is now full. Move it to the full list * and select a new current page. */ LIST_REMOVE(ph, ph_pagelist); LIST_INSERT_HEAD(&pp->pr_fullpages, ph, ph_pagelist); pool_update_curpage(pp); } pp->pr_nget++; /* * If we have a low water mark and we are now below that low * water mark, add more items to the pool. */ if (POOL_NEEDS_CATCHUP(pp) && pool_catchup(pp) != 0) { /* * XXX: Should we log a warning? Should we set up a timeout * to try again in a second or so? The latter could break * a caller's assumptions about interrupt protection, etc. */ } pr_leave(pp); simple_unlock(&pp->pr_slock); return (v); } /* * Internal version of pool_put(). Pool is already locked/entered. */ void pool_do_put(struct pool *pp, void *v) { struct pool_item *pi = v; struct pool_item_header *ph; caddr_t page; #ifdef MALLOC_DEBUG if (pp->pr_roflags & PR_DEBUG) { debug_free(v, M_DEBUG); return; } #endif LOCK_ASSERT(simple_lock_held(&pp->pr_slock)); page = (caddr_t)((vaddr_t)v & pp->pr_alloc->pa_pagemask); #ifdef DIAGNOSTIC if (__predict_false(pp->pr_nout == 0)) { printf("pool %s: putting with none out\n", pp->pr_wchan); panic("pool_put"); } #endif if (__predict_false((ph = pr_find_pagehead(pp, page)) == NULL)) { pr_printlog(pp, NULL, printf); panic("pool_put: %s: page header missing", pp->pr_wchan); } #ifdef LOCKDEBUG /* * Check if we're freeing a locked simple lock. */ simple_lock_freecheck((caddr_t)pi, ((caddr_t)pi) + pp->pr_size); #endif /* * Return to item list. */ #ifdef DIAGNOSTIC pi->pi_magic = PI_MAGIC; #endif #ifdef DEBUG { int i, *ip = v; for (i = 0; i < pp->pr_size / sizeof(int); i++) { *ip++ = PI_MAGIC; } } #endif TAILQ_INSERT_HEAD(&ph->ph_itemlist, pi, pi_list); ph->ph_nmissing--; pp->pr_nput++; pp->pr_nitems++; pp->pr_nout--; /* Cancel "pool empty" condition if it exists */ if (pp->pr_curpage == NULL) pp->pr_curpage = ph; if (pp->pr_flags & PR_WANTED) { pp->pr_flags &= ~PR_WANTED; if (ph->ph_nmissing == 0) pp->pr_nidle++; wakeup(pp); return; } /* * If this page is now empty, do one of two things: * * (1) If we have more pages than the page high water mark, * free the page back to the system. * * (2) Otherwise, move the page to the empty page list. * * Either way, select a new current page (so we use a partially-full * page if one is available). */ if (ph->ph_nmissing == 0) { pp->pr_nidle++; if (pp->pr_nidle > pp->pr_maxpages || (pp->pr_alloc->pa_flags & PA_WANT) != 0) { pr_rmpage(pp, ph, NULL); } else { LIST_REMOVE(ph, ph_pagelist); LIST_INSERT_HEAD(&pp->pr_emptypages, ph, ph_pagelist); /* * Update the timestamp on the page. A page must * be idle for some period of time before it can * be reclaimed by the pagedaemon. This minimizes * ping-pong'ing for memory. */ microuptime(&ph->ph_time); } pool_update_curpage(pp); } /* * If the page was previously completely full, move it to the * partially-full list and make it the current page. The next * allocation will get the item from this page, instead of * further fragmenting the pool. */ else if (ph->ph_nmissing == (pp->pr_itemsperpage - 1)) { LIST_REMOVE(ph, ph_pagelist); LIST_INSERT_HEAD(&pp->pr_partpages, ph, ph_pagelist); pp->pr_curpage = ph; } } /* * Return resource to the pool; must be called at appropriate spl level */ #ifdef POOL_DIAGNOSTIC void _pool_put(struct pool *pp, void *v, const char *file, long line) { simple_lock(&pp->pr_slock); pr_enter(pp, file, line); pr_log(pp, v, PRLOG_PUT, file, line); pool_do_put(pp, v); pr_leave(pp); simple_unlock(&pp->pr_slock); } #undef pool_put #endif /* POOL_DIAGNOSTIC */ void pool_put(struct pool *pp, void *v) { simple_lock(&pp->pr_slock); pool_do_put(pp, v); simple_unlock(&pp->pr_slock); } #ifdef POOL_DIAGNOSTIC #define pool_put(h, v) _pool_put((h), (v), __FILE__, __LINE__) #endif /* * Add N items to the pool. */ int pool_prime(struct pool *pp, int n) { struct pool_item_header *ph; caddr_t cp; int newpages; simple_lock(&pp->pr_slock); newpages = roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage; while (newpages-- > 0) { simple_unlock(&pp->pr_slock); cp = pool_allocator_alloc(pp, PR_NOWAIT); if (__predict_true(cp != NULL)) ph = pool_alloc_item_header(pp, cp, PR_NOWAIT); simple_lock(&pp->pr_slock); if (__predict_false(cp == NULL || ph == NULL)) { if (cp != NULL) pool_allocator_free(pp, cp); break; } pool_prime_page(pp, cp, ph); pp->pr_npagealloc++; pp->pr_minpages++; } if (pp->pr_minpages >= pp->pr_maxpages) pp->pr_maxpages = pp->pr_minpages + 1; /* XXX */ simple_unlock(&pp->pr_slock); return (0); } /* * Add a page worth of items to the pool. * * Note, we must be called with the pool descriptor LOCKED. */ void pool_prime_page(struct pool *pp, caddr_t storage, struct pool_item_header *ph) { struct pool_item *pi; caddr_t cp = storage; unsigned int align = pp->pr_align; unsigned int ioff = pp->pr_itemoffset; int n; #ifdef DIAGNOSTIC if (((u_long)cp & (pp->pr_alloc->pa_pagesz - 1)) != 0) panic("pool_prime_page: %s: unaligned page", pp->pr_wchan); #endif /* * Insert page header. */ LIST_INSERT_HEAD(&pp->pr_emptypages, ph, ph_pagelist); TAILQ_INIT(&ph->ph_itemlist); ph->ph_page = storage; ph->ph_nmissing = 0; memset(&ph->ph_time, 0, sizeof(ph->ph_time)); if ((pp->pr_roflags & PR_PHINPAGE) == 0) SPLAY_INSERT(phtree, &pp->pr_phtree, ph); pp->pr_nidle++; /* * Color this page. */ cp = (caddr_t)(cp + pp->pr_curcolor); if ((pp->pr_curcolor += align) > pp->pr_maxcolor) pp->pr_curcolor = 0; /* * Adjust storage to apply aligment to `pr_itemoffset' in each item. */ if (ioff != 0) cp = (caddr_t)(cp + (align - ioff)); /* * Insert remaining chunks on the bucket list. */ n = pp->pr_itemsperpage; pp->pr_nitems += n; while (n--) { pi = (struct pool_item *)cp; KASSERT(((((vaddr_t)pi) + ioff) & (align - 1)) == 0); /* Insert on page list */ TAILQ_INSERT_TAIL(&ph->ph_itemlist, pi, pi_list); #ifdef DIAGNOSTIC pi->pi_magic = PI_MAGIC; #endif cp = (caddr_t)(cp + pp->pr_size); } /* * If the pool was depleted, point at the new page. */ if (pp->pr_curpage == NULL) pp->pr_curpage = ph; if (++pp->pr_npages > pp->pr_hiwat) pp->pr_hiwat = pp->pr_npages; } /* * Used by pool_get() when nitems drops below the low water mark. This * is used to catch up pr_nitems with the low water mark. * * Note 1, we never wait for memory here, we let the caller decide what to do. * * Note 2, we must be called with the pool already locked, and we return * with it locked. */ int pool_catchup(struct pool *pp) { struct pool_item_header *ph; caddr_t cp; int error = 0; while (POOL_NEEDS_CATCHUP(pp)) { /* * Call the page back-end allocator for more memory. * * XXX: We never wait, so should we bother unlocking * the pool descriptor? */ simple_unlock(&pp->pr_slock); cp = pool_allocator_alloc(pp, PR_NOWAIT); if (__predict_true(cp != NULL)) ph = pool_alloc_item_header(pp, cp, PR_NOWAIT); simple_lock(&pp->pr_slock); if (__predict_false(cp == NULL || ph == NULL)) { if (cp != NULL) pool_allocator_free(pp, cp); error = ENOMEM; break; } pool_prime_page(pp, cp, ph); pp->pr_npagealloc++; } return (error); } void pool_update_curpage(struct pool *pp) { pp->pr_curpage = LIST_FIRST(&pp->pr_partpages); if (pp->pr_curpage == NULL) { pp->pr_curpage = LIST_FIRST(&pp->pr_emptypages); } } void pool_setlowat(struct pool *pp, int n) { simple_lock(&pp->pr_slock); pp->pr_minitems = n; pp->pr_minpages = (n == 0) ? 0 : roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage; /* Make sure we're caught up with the newly-set low water mark. */ if (POOL_NEEDS_CATCHUP(pp) && pool_catchup(pp) != 0) { /* * XXX: Should we log a warning? Should we set up a timeout * to try again in a second or so? The latter could break * a caller's assumptions about interrupt protection, etc. */ } simple_unlock(&pp->pr_slock); } void pool_sethiwat(struct pool *pp, int n) { simple_lock(&pp->pr_slock); pp->pr_maxpages = (n == 0) ? 0 : roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage; simple_unlock(&pp->pr_slock); } int pool_sethardlimit(struct pool *pp, unsigned n, const char *warnmess, int ratecap) { int error = 0; simple_lock(&pp->pr_slock); if (n < pp->pr_nout) { error = EINVAL; goto done; } pp->pr_hardlimit = n; pp->pr_hardlimit_warning = warnmess; pp->pr_hardlimit_ratecap.tv_sec = ratecap; pp->pr_hardlimit_warning_last.tv_sec = 0; pp->pr_hardlimit_warning_last.tv_usec = 0; /* * In-line version of pool_sethiwat(), because we don't want to * release the lock. */ pp->pr_maxpages = (n == 0 || n == UINT_MAX) ? n : roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage; done: simple_unlock(&pp->pr_slock); return (error); } /* * Release all complete pages that have not been used recently. * * Returns non-zero if any pages have been reclaimed. */ int #ifdef POOL_DIAGNOSTIC _pool_reclaim(struct pool *pp, const char *file, long line) #else pool_reclaim(struct pool *pp) #endif { struct pool_item_header *ph, *phnext; struct pool_cache *pc; struct timeval curtime; struct pool_pagelist pq; struct timeval diff; int s; if (simple_lock_try(&pp->pr_slock) == 0) return (0); pr_enter(pp, file, line); LIST_INIT(&pq); /* * Reclaim items from the pool's caches. */ TAILQ_FOREACH(pc, &pp->pr_cachelist, pc_poollist) pool_cache_reclaim(pc); microuptime(&curtime); for (ph = LIST_FIRST(&pp->pr_emptypages); ph != NULL; ph = phnext) { phnext = LIST_NEXT(ph, ph_pagelist); /* Check our minimum page claim */ if (pp->pr_npages <= pp->pr_minpages) break; KASSERT(ph->ph_nmissing == 0); timersub(&curtime, &ph->ph_time, &diff); if (diff.tv_sec < pool_inactive_time) continue; /* * If freeing this page would put us below * the low water mark, stop now. */ if ((pp->pr_nitems - pp->pr_itemsperpage) < pp->pr_minitems) break; pr_rmpage(pp, ph, &pq); } pr_leave(pp); simple_unlock(&pp->pr_slock); if (LIST_EMPTY(&pq)) return (0); while ((ph = LIST_FIRST(&pq)) != NULL) { LIST_REMOVE(ph, ph_pagelist); pool_allocator_free(pp, ph->ph_page); if (pp->pr_roflags & PR_PHINPAGE) { continue; } SPLAY_REMOVE(phtree, &pp->pr_phtree, ph); s = splhigh(); pool_put(&phpool, ph); splx(s); } return (1); } #ifdef DDB #include #include #include /* * Diagnostic helpers. */ void pool_printit(struct pool *pp, const char *modif, int (*pr)(const char *, ...)) { int s; s = splvm(); if (simple_lock_try(&pp->pr_slock) == 0) { pr("pool %s is locked; try again later\n", pp->pr_wchan); splx(s); return; } pool_print1(pp, modif, pr); simple_unlock(&pp->pr_slock); splx(s); } void pool_print_pagelist(struct pool_pagelist *pl, int (*pr)(const char *, ...)) { struct pool_item_header *ph; #ifdef DIAGNOSTIC struct pool_item *pi; #endif LIST_FOREACH(ph, pl, ph_pagelist) { (*pr)("\t\tpage %p, nmissing %d, time %lu,%lu\n", ph->ph_page, ph->ph_nmissing, (u_long)ph->ph_time.tv_sec, (u_long)ph->ph_time.tv_usec); #ifdef DIAGNOSTIC TAILQ_FOREACH(pi, &ph->ph_itemlist, pi_list) { if (pi->pi_magic != PI_MAGIC) { (*pr)("\t\t\titem %p, magic 0x%x\n", pi, pi->pi_magic); } } #endif } } void pool_print1(struct pool *pp, const char *modif, int (*pr)(const char *, ...)) { struct pool_item_header *ph; struct pool_cache *pc; struct pool_cache_group *pcg; int i, print_log = 0, print_pagelist = 0, print_cache = 0; char c; while ((c = *modif++) != '\0') { if (c == 'l') print_log = 1; if (c == 'p') print_pagelist = 1; if (c == 'c') print_cache = 1; modif++; } (*pr)("POOL %s: size %u, align %u, ioff %u, roflags 0x%08x\n", pp->pr_wchan, pp->pr_size, pp->pr_align, pp->pr_itemoffset, pp->pr_roflags); (*pr)("\talloc %p\n", pp->pr_alloc); (*pr)("\tminitems %u, minpages %u, maxpages %u, npages %u\n", pp->pr_minitems, pp->pr_minpages, pp->pr_maxpages, pp->pr_npages); (*pr)("\titemsperpage %u, nitems %u, nout %u, hardlimit %u\n", pp->pr_itemsperpage, pp->pr_nitems, pp->pr_nout, pp->pr_hardlimit); (*pr)("\n\tnget %lu, nfail %lu, nput %lu\n", pp->pr_nget, pp->pr_nfail, pp->pr_nput); (*pr)("\tnpagealloc %lu, npagefree %lu, hiwat %u, nidle %lu\n", pp->pr_npagealloc, pp->pr_npagefree, pp->pr_hiwat, pp->pr_nidle); if (print_pagelist == 0) goto skip_pagelist; if ((ph = LIST_FIRST(&pp->pr_emptypages)) != NULL) (*pr)("\n\tempty page list:\n"); pool_print_pagelist(&pp->pr_emptypages, pr); if ((ph = LIST_FIRST(&pp->pr_fullpages)) != NULL) (*pr)("\n\tfull page list:\n"); pool_print_pagelist(&pp->pr_fullpages, pr); if ((ph = LIST_FIRST(&pp->pr_partpages)) != NULL) (*pr)("\n\tpartial-page list:\n"); pool_print_pagelist(&pp->pr_partpages, pr); if (pp->pr_curpage == NULL) (*pr)("\tno current page\n"); else (*pr)("\tcurpage %p\n", pp->pr_curpage->ph_page); skip_pagelist: if (print_log == 0) goto skip_log; (*pr)("\n"); if ((pp->pr_roflags & PR_LOGGING) == 0) (*pr)("\tno log\n"); else pr_printlog(pp, NULL, pr); skip_log: if (print_cache == 0) goto skip_cache; TAILQ_FOREACH(pc, &pp->pr_cachelist, pc_poollist) { (*pr)("\tcache %p: allocfrom %p freeto %p\n", pc, pc->pc_allocfrom, pc->pc_freeto); (*pr)("\t hits %lu misses %lu ngroups %lu nitems %lu\n", pc->pc_hits, pc->pc_misses, pc->pc_ngroups, pc->pc_nitems); TAILQ_FOREACH(pcg, &pc->pc_grouplist, pcg_list) { (*pr)("\t\tgroup %p: avail %d\n", pcg, pcg->pcg_avail); for (i = 0; i < PCG_NOBJECTS; i++) (*pr)("\t\t\t%p\n", pcg->pcg_objects[i]); } } skip_cache: pr_enter_check(pp, pr); } void db_show_all_pools(db_expr_t expr, int haddr, db_expr_t count, char *modif) { struct pool *pp; char maxp[16]; int ovflw; char mode; mode = modif[0]; if (mode != '\0' && mode != 'a') { db_printf("usage: show all pools [/a]\n"); return; } if (mode == '\0') db_printf("%-10s%4s%9s%5s%9s%6s%6s%6s%6s%6s%6s%5s\n", "Name", "Size", "Requests", "Fail", "Releases", "Pgreq", "Pgrel", "Npage", "Hiwat", "Minpg", "Maxpg", "Idle"); else db_printf("%-10s %18s %18s\n", "Name", "Address", "Allocator"); TAILQ_FOREACH(pp, &pool_head, pr_poollist) { if (mode == 'a') { db_printf("%-10s %18p %18p\n", pp->pr_wchan, pp, pp->pr_alloc); continue; } if (!pp->pr_nget) continue; if (pp->pr_maxpages == UINT_MAX) snprintf(maxp, sizeof maxp, "inf"); else snprintf(maxp, sizeof maxp, "%u", pp->pr_maxpages); #define PRWORD(ovflw, fmt, width, fixed, val) do { \ (ovflw) += db_printf((fmt), \ (width) - (fixed) - (ovflw) > 0 ? \ (width) - (fixed) - (ovflw) : 0, \ (val)) - (width); \ if ((ovflw) < 0) \ (ovflw) = 0; \ } while (/* CONSTCOND */0) ovflw = 0; PRWORD(ovflw, "%-*s", 10, 0, pp->pr_wchan); PRWORD(ovflw, " %*u", 4, 1, pp->pr_size); PRWORD(ovflw, " %*lu", 9, 1, pp->pr_nget); PRWORD(ovflw, " %*lu", 5, 1, pp->pr_nfail); PRWORD(ovflw, " %*lu", 9, 1, pp->pr_nput); PRWORD(ovflw, " %*lu", 6, 1, pp->pr_npagealloc); PRWORD(ovflw, " %*lu", 6, 1, pp->pr_npagefree); PRWORD(ovflw, " %*d", 6, 1, pp->pr_npages); PRWORD(ovflw, " %*d", 6, 1, pp->pr_hiwat); PRWORD(ovflw, " %*d", 6, 1, pp->pr_minpages); PRWORD(ovflw, " %*s", 6, 1, maxp); PRWORD(ovflw, " %*lu\n", 5, 1, pp->pr_nidle); } } int pool_chk_page(struct pool *pp, const char *label, struct pool_item_header *ph) { struct pool_item *pi; caddr_t page; int n; page = (caddr_t)((u_long)ph & pp->pr_alloc->pa_pagemask); if (page != ph->ph_page && (pp->pr_roflags & PR_PHINPAGE) != 0) { if (label != NULL) printf("%s: ", label); printf("pool(%p:%s): page inconsistency: page %p;" " at page head addr %p (p %p)\n", pp, pp->pr_wchan, ph->ph_page, ph, page); return 1; } for (pi = TAILQ_FIRST(&ph->ph_itemlist), n = 0; pi != NULL; pi = TAILQ_NEXT(pi,pi_list), n++) { #ifdef DIAGNOSTIC if (pi->pi_magic != PI_MAGIC) { if (label != NULL) printf("%s: ", label); printf("pool(%s): free list modified: magic=%x;" " page %p; item ordinal %d;" " addr %p (p %p)\n", pp->pr_wchan, pi->pi_magic, ph->ph_page, n, pi, page); panic("pool"); } #endif page = (caddr_t)((u_long)pi & pp->pr_alloc->pa_pagemask); if (page == ph->ph_page) continue; if (label != NULL) printf("%s: ", label); printf("pool(%p:%s): page inconsistency: page %p;" " item ordinal %d; addr %p (p %p)\n", pp, pp->pr_wchan, ph->ph_page, n, pi, page); return 1; } return 0; } int pool_chk(struct pool *pp, const char *label) { struct pool_item_header *ph; int r = 0; simple_lock(&pp->pr_slock); LIST_FOREACH(ph, &pp->pr_emptypages, ph_pagelist) { r = pool_chk_page(pp, label, ph); if (r) { goto out; } } LIST_FOREACH(ph, &pp->pr_fullpages, ph_pagelist) { r = pool_chk_page(pp, label, ph); if (r) { goto out; } } LIST_FOREACH(ph, &pp->pr_partpages, ph_pagelist) { r = pool_chk_page(pp, label, ph); if (r) { goto out; } } out: simple_unlock(&pp->pr_slock); return (r); } #endif /* * pool_cache_init: * * Initialize a pool cache. * * NOTE: If the pool must be protected from interrupts, we expect * to be called at the appropriate interrupt priority level. */ void pool_cache_init(struct pool_cache *pc, struct pool *pp, int (*ctor)(void *, void *, int), void (*dtor)(void *, void *), void *arg) { TAILQ_INIT(&pc->pc_grouplist); simple_lock_init(&pc->pc_slock); pc->pc_allocfrom = NULL; pc->pc_freeto = NULL; pc->pc_pool = pp; pc->pc_ctor = ctor; pc->pc_dtor = dtor; pc->pc_arg = arg; pc->pc_hits = 0; pc->pc_misses = 0; pc->pc_ngroups = 0; pc->pc_nitems = 0; simple_lock(&pp->pr_slock); TAILQ_INSERT_TAIL(&pp->pr_cachelist, pc, pc_poollist); simple_unlock(&pp->pr_slock); } /* * pool_cache_destroy: * * Destroy a pool cache. */ void pool_cache_destroy(struct pool_cache *pc) { struct pool *pp = pc->pc_pool; /* First, invalidate the entire cache. */ pool_cache_invalidate(pc); /* ...and remove it from the pool's cache list. */ simple_lock(&pp->pr_slock); TAILQ_REMOVE(&pp->pr_cachelist, pc, pc_poollist); simple_unlock(&pp->pr_slock); } static __inline void * pcg_get(struct pool_cache_group *pcg) { void *object; u_int idx; KASSERT(pcg->pcg_avail <= PCG_NOBJECTS); KASSERT(pcg->pcg_avail != 0); idx = --pcg->pcg_avail; KASSERT(pcg->pcg_objects[idx] != NULL); object = pcg->pcg_objects[idx]; pcg->pcg_objects[idx] = NULL; return (object); } static __inline void pcg_put(struct pool_cache_group *pcg, void *object) { u_int idx; KASSERT(pcg->pcg_avail < PCG_NOBJECTS); idx = pcg->pcg_avail++; KASSERT(pcg->pcg_objects[idx] == NULL); pcg->pcg_objects[idx] = object; } /* * pool_cache_get: * * Get an object from a pool cache. */ void * pool_cache_get(struct pool_cache *pc, int flags) { struct pool_cache_group *pcg; void *object; #ifdef LOCKDEBUG if (flags & PR_WAITOK) simple_lock_only_held(NULL, "pool_cache_get(PR_WAITOK)"); #endif simple_lock(&pc->pc_slock); if ((pcg = pc->pc_allocfrom) == NULL) { TAILQ_FOREACH(pcg, &pc->pc_grouplist, pcg_list) { if (pcg->pcg_avail != 0) { pc->pc_allocfrom = pcg; goto have_group; } } /* * No groups with any available objects. Allocate * a new object, construct it, and return it to * the caller. We will allocate a group, if necessary, * when the object is freed back to the cache. */ pc->pc_misses++; simple_unlock(&pc->pc_slock); object = pool_get(pc->pc_pool, flags); if (object != NULL && pc->pc_ctor != NULL) { if ((*pc->pc_ctor)(pc->pc_arg, object, flags) != 0) { pool_put(pc->pc_pool, object); return (NULL); } } return (object); } have_group: pc->pc_hits++; pc->pc_nitems--; object = pcg_get(pcg); if (pcg->pcg_avail == 0) pc->pc_allocfrom = NULL; simple_unlock(&pc->pc_slock); return (object); } /* * pool_cache_put: * * Put an object back to the pool cache. */ void pool_cache_put(struct pool_cache *pc, void *object) { struct pool_cache_group *pcg; int s; simple_lock(&pc->pc_slock); if ((pcg = pc->pc_freeto) == NULL) { TAILQ_FOREACH(pcg, &pc->pc_grouplist, pcg_list) { if (pcg->pcg_avail != PCG_NOBJECTS) { pc->pc_freeto = pcg; goto have_group; } } /* * No empty groups to free the object to. Attempt to * allocate one. */ simple_unlock(&pc->pc_slock); s = splvm(); pcg = pool_get(&pcgpool, PR_NOWAIT); splx(s); if (pcg != NULL) { memset(pcg, 0, sizeof(*pcg)); simple_lock(&pc->pc_slock); pc->pc_ngroups++; TAILQ_INSERT_TAIL(&pc->pc_grouplist, pcg, pcg_list); if (pc->pc_freeto == NULL) pc->pc_freeto = pcg; goto have_group; } /* * Unable to allocate a cache group; destruct the object * and free it back to the pool. */ pool_cache_destruct_object(pc, object); return; } have_group: pc->pc_nitems++; pcg_put(pcg, object); if (pcg->pcg_avail == PCG_NOBJECTS) pc->pc_freeto = NULL; simple_unlock(&pc->pc_slock); } /* * pool_cache_destruct_object: * * Force destruction of an object and its release back into * the pool. */ void pool_cache_destruct_object(struct pool_cache *pc, void *object) { if (pc->pc_dtor != NULL) (*pc->pc_dtor)(pc->pc_arg, object); pool_put(pc->pc_pool, object); } /* * pool_cache_do_invalidate: * * This internal function implements pool_cache_invalidate() and * pool_cache_reclaim(). */ void pool_cache_do_invalidate(struct pool_cache *pc, int free_groups, void (*putit)(struct pool *, void *)) { struct pool_cache_group *pcg, *npcg; void *object; int s; for (pcg = TAILQ_FIRST(&pc->pc_grouplist); pcg != NULL; pcg = npcg) { npcg = TAILQ_NEXT(pcg, pcg_list); while (pcg->pcg_avail != 0) { pc->pc_nitems--; object = pcg_get(pcg); if (pcg->pcg_avail == 0 && pc->pc_allocfrom == pcg) pc->pc_allocfrom = NULL; if (pc->pc_dtor != NULL) (*pc->pc_dtor)(pc->pc_arg, object); (*putit)(pc->pc_pool, object); } if (free_groups) { pc->pc_ngroups--; TAILQ_REMOVE(&pc->pc_grouplist, pcg, pcg_list); if (pc->pc_freeto == pcg) pc->pc_freeto = NULL; s = splvm(); pool_put(&pcgpool, pcg); splx(s); } } } /* * pool_cache_invalidate: * * Invalidate a pool cache (destruct and release all of the * cached objects). */ void pool_cache_invalidate(struct pool_cache *pc) { simple_lock(&pc->pc_slock); pool_cache_do_invalidate(pc, 0, pool_put); simple_unlock(&pc->pc_slock); } /* * pool_cache_reclaim: * * Reclaim a pool cache for pool_reclaim(). */ void pool_cache_reclaim(struct pool_cache *pc) { simple_lock(&pc->pc_slock); pool_cache_do_invalidate(pc, 1, pool_do_put); simple_unlock(&pc->pc_slock); } /* * We have three different sysctls. * kern.pool.npools - the number of pools. * kern.pool.pool. - the pool struct for the pool#. * kern.pool.name. - the name for pool#. */ int sysctl_dopool(int *name, u_int namelen, char *where, size_t *sizep) { struct pool *pp, *foundpool = NULL; size_t buflen = where != NULL ? *sizep : 0; int npools = 0, s; unsigned int lookfor; size_t len; switch (*name) { case KERN_POOL_NPOOLS: if (namelen != 1 || buflen != sizeof(int)) return (EINVAL); lookfor = 0; break; case KERN_POOL_NAME: if (namelen != 2 || buflen < 1) return (EINVAL); lookfor = name[1]; break; case KERN_POOL_POOL: if (namelen != 2 || buflen != sizeof(struct pool)) return (EINVAL); lookfor = name[1]; break; default: return (EINVAL); } s = splvm(); simple_lock(&pool_head_slock); TAILQ_FOREACH(pp, &pool_head, pr_poollist) { npools++; if (lookfor == pp->pr_serial) { foundpool = pp; break; } } simple_unlock(&pool_head_slock); splx(s); if (lookfor != 0 && foundpool == NULL) return (ENOENT); switch (*name) { case KERN_POOL_NPOOLS: return copyout(&npools, where, buflen); case KERN_POOL_NAME: len = strlen(foundpool->pr_wchan) + 1; if (*sizep < len) return (ENOMEM); *sizep = len; return copyout(foundpool->pr_wchan, where, len); case KERN_POOL_POOL: return copyout(foundpool, where, buflen); } /* NOTREACHED */ return (0); /* XXX - Stupid gcc */ } /* * Pool backend allocators. * * Each pool has a backend allocator that handles allocation, deallocation */ void *pool_page_alloc_oldnointr(struct pool *, int); void pool_page_free_oldnointr(struct pool *, void *); void *pool_page_alloc(struct pool *, int); void pool_page_free(struct pool *, void *); /* previous nointr. handles large allocations safely */ struct pool_allocator pool_allocator_oldnointr = { pool_page_alloc_oldnointr, pool_page_free_oldnointr, 0, }; /* safe for interrupts, name preserved for compat * this is the default allocator */ struct pool_allocator pool_allocator_nointr = { pool_page_alloc, pool_page_free, 0, }; /* * XXX - we have at least three different resources for the same allocation * and each resource can be depleted. First we have the ready elements in * the pool. Then we have the resource (typically a vm_map) for this * allocator, then we have physical memory. Waiting for any of these can * be unnecessary when any other is freed, but the kernel doesn't support * sleeping on multiple addresses, so we have to fake. The caller sleeps on * the pool (so that we can be awakened when an item is returned to the pool), * but we set PA_WANT on the allocator. When a page is returned to * the allocator and PA_WANT is set pool_allocator_free will wakeup all * sleeping pools belonging to this allocator. (XXX - thundering herd). * We also wake up the allocator in case someone without a pool (malloc) * is sleeping waiting for this allocator. */ void * pool_allocator_alloc(struct pool *pp, int flags) { return (pp->pr_alloc->pa_alloc(pp, flags)); } void pool_allocator_free(struct pool *pp, void *v) { struct pool_allocator *pa = pp->pr_alloc; int s; (*pa->pa_free)(pp, v); s = splvm(); simple_lock(&pa->pa_slock); if ((pa->pa_flags & PA_WANT) == 0) { simple_unlock(&pa->pa_slock); splx(s); return; } TAILQ_FOREACH(pp, &pa->pa_list, pr_alloc_list) { simple_lock(&pp->pr_slock); if ((pp->pr_flags & PR_WANTED) != 0) { pp->pr_flags &= ~PR_WANTED; wakeup(pp); } simple_unlock(&pp->pr_slock); } pa->pa_flags &= ~PA_WANT; simple_unlock(&pa->pa_slock); splx(s); } void * pool_page_alloc(struct pool *pp, int flags) { boolean_t waitok = (flags & PR_WAITOK) ? TRUE : FALSE; return (uvm_km_getpage(waitok)); } void pool_page_free(struct pool *pp, void *v) { uvm_km_putpage(v); } void * pool_page_alloc_oldnointr(struct pool *pp, int flags) { boolean_t waitok = (flags & PR_WAITOK) ? TRUE : FALSE; splassert(IPL_NONE); return ((void *)uvm_km_alloc_poolpage1(kernel_map, uvm.kernel_object, waitok)); } void pool_page_free_oldnointr(struct pool *pp, void *v) { splassert(IPL_NONE); uvm_km_free_poolpage1(kernel_map, (vaddr_t)v); }