Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files. =================================================================== RCS file: /ftp/cvs/cvsroot/src/sys/kern/subr_pool.c,v rcsdiff: /ftp/cvs/cvsroot/src/sys/kern/subr_pool.c,v: warning: Unknown phrases like `commitid ...;' are present. retrieving revision 1.21.2.4 retrieving revision 1.90 diff -u -p -r1.21.2.4 -r1.90 --- src/sys/kern/subr_pool.c 1999/06/25 00:08:22 1.21.2.4 +++ src/sys/kern/subr_pool.c 2004/01/09 19:00:16 1.90 @@ -1,7 +1,7 @@ -/* $NetBSD: subr_pool.c,v 1.21.2.4 1999/06/25 00:08:22 perry Exp $ */ +/* $NetBSD: subr_pool.c,v 1.90 2004/01/09 19:00:16 thorpej Exp $ */ /*- - * Copyright (c) 1997, 1999 The NetBSD Foundation, Inc. + * Copyright (c) 1997, 1999, 2000 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation @@ -37,6 +37,13 @@ * POSSIBILITY OF SUCH DAMAGE. */ +#include +__KERNEL_RCSID(0, "$NetBSD: subr_pool.c,v 1.90 2004/01/09 19:00:16 thorpej Exp $"); + +#include "opt_pool.h" +#include "opt_poollog.h" +#include "opt_lockdebug.h" + #include #include #include @@ -47,20 +54,19 @@ #include #include -#include -#include - #include /* * 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 a list headed by `pr_pagelist' - * in the pool structure and 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'). + * 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 */ @@ -69,6 +75,11 @@ TAILQ_HEAD(,pool) pool_head = TAILQ_HEAD /* Private pool for page header structures */ static struct pool phpool; +#ifdef POOL_SUBPAGE +/* Pool of subpages for use by normal pools. */ +static struct pool psppool; +#endif + /* # of seconds to retain page after last use */ int pool_inactive_time = 10; @@ -80,56 +91,88 @@ struct simplelock pool_head_slock = SIMP struct pool_item_header { /* Page headers */ - TAILQ_ENTRY(pool_item_header) + LIST_ENTRY(pool_item_header) ph_pagelist; /* pool page list */ TAILQ_HEAD(,pool_item) ph_itemlist; /* chunk list for this page */ - LIST_ENTRY(pool_item_header) - ph_hashlist; /* Off-page page headers */ - int ph_nmissing; /* # of chunks in use */ + SPLAY_ENTRY(pool_item_header) + ph_node; /* Off-page page headers */ + unsigned 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; -#define PI_MAGIC 0xdeadbeef + u_int pi_magic; #endif +#define PI_MAGIC 0xdeadbeefU /* Other entries use only this list entry */ TAILQ_ENTRY(pool_item) pi_list; }; +#define POOL_NEEDS_CATCHUP(pp) \ + ((pp)->pr_nitems < (pp)->pr_minitems) -#define PR_HASH_INDEX(pp,addr) \ - (((u_long)(addr) >> (pp)->pr_pageshift) & (PR_HASHTABSIZE - 1)) +/* + * 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; +static void pool_cache_reclaim(struct pool_cache *); -static struct pool_item_header - *pr_find_pagehead __P((struct pool *, caddr_t)); -static void pr_rmpage __P((struct pool *, struct pool_item_header *)); -static int pool_catchup __P((struct pool *)); -static void pool_prime_page __P((struct pool *, caddr_t)); -static void *pool_page_alloc __P((unsigned long, int, int)); -static void pool_page_free __P((void *, unsigned long, int)); +static int pool_catchup(struct pool *); +static void pool_prime_page(struct pool *, caddr_t, + struct pool_item_header *); +static void pool_update_curpage(struct pool *); + +void *pool_allocator_alloc(struct pool *, int); +void pool_allocator_free(struct pool *, void *); + +static void pool_print_pagelist(struct pool_pagelist *, + void (*)(const char *, ...)); +static void pool_print1(struct pool *, const char *, + void (*)(const char *, ...)); -#if defined(POOL_DIAGNOSTIC) || defined(DEBUG) -static void pool_print1 __P((struct pool *, const char *)); -#endif +static int pool_chk_page(struct pool *, const char *, + struct pool_item_header *); -#ifdef POOL_DIAGNOSTIC /* - * Pool log entry. An array of these is allocated in pool_create(). + * 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 +#define PRLOG_GET 1 +#define PRLOG_PUT 2 void *pl_addr; }; +#ifdef POOL_DIAGNOSTIC /* Number of entries in pool log buffers */ #ifndef POOL_LOGSIZE #define POOL_LOGSIZE 10 @@ -137,16 +180,8 @@ struct pool_log { int pool_logsize = POOL_LOGSIZE; -static void pr_log __P((struct pool *, void *, int, const char *, long)); -static void pr_printlog __P((struct pool *)); - -static __inline__ void -pr_log(pp, v, action, file, line) - struct pool *pp; - void *v; - int action; - const char *file; - long line; +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; @@ -169,8 +204,8 @@ pr_log(pp, v, action, file, line) } static void -pr_printlog(pp) - struct pool *pp; +pr_printlog(struct pool *pp, struct pool_item *pi, + void (*pr)(const char *, ...)) { int i = pp->pr_logsize; int n = pp->pr_curlogentry; @@ -178,61 +213,109 @@ pr_printlog(pp) if ((pp->pr_roflags & PR_LOGGING) == 0) return; - pool_print1(pp, "printlog"); - /* * Print all entries in this pool's log. */ while (i-- > 0) { struct pool_log *pl = &pp->pr_log[n]; if (pl->pl_action != 0) { - printf("log entry %d:\n", i); - printf("\taction = %s, addr = %p\n", - pl->pl_action == PRLOG_GET ? "get" : "put", - pl->pl_addr); - printf("\tfile: %s at line %lu\n", - pl->pl_file, pl->pl_line); + 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, void (*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) -#endif +#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(pp, page) - struct pool *pp; - caddr_t page; +static __inline struct pool_item_header * +pr_find_pagehead(struct pool *pp, caddr_t page) { - struct pool_item_header *ph; + struct pool_item_header *ph, tmp; if ((pp->pr_roflags & PR_PHINPAGE) != 0) return ((struct pool_item_header *)(page + pp->pr_phoffset)); - for (ph = LIST_FIRST(&pp->pr_hashtab[PR_HASH_INDEX(pp, page)]); - ph != NULL; - ph = LIST_NEXT(ph, ph_hashlist)) { - if (ph->ph_page == page) - return (ph); - } - return (NULL); + tmp.ph_page = page; + ph = SPLAY_FIND(phtree, &pp->pr_phtree, &tmp); + return ph; } /* * Remove a page from the pool. */ -static __inline__ void -pr_rmpage(pp, ph) - struct pool *pp; - struct pool_item_header *ph; +static __inline 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. @@ -250,115 +333,83 @@ pr_rmpage(pp, ph) pp->pr_nitems -= pp->pr_itemsperpage; /* - * Unlink a page from the pool and release it. + * Unlink a page from the pool and release it (or queue it for release). */ - TAILQ_REMOVE(&pp->pr_pagelist, ph, ph_pagelist); - (*pp->pr_free)(ph->ph_page, pp->pr_pagesz, pp->pr_mtype); + 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 = splvm(); + pool_put(&phpool, ph); + splx(s); + } + } pp->pr_npages--; pp->pr_npagefree++; - if ((pp->pr_roflags & PR_PHINPAGE) == 0) { - int s; - LIST_REMOVE(ph, ph_hashlist); - s = splhigh(); - pool_put(&phpool, ph); - splx(s); - } - - if (pp->pr_curpage == ph) { - /* - * Find a new non-empty page header, if any. - * Start search from the page head, to increase the - * chance for "high water" pages to be freed. - */ - for (ph = TAILQ_FIRST(&pp->pr_pagelist); ph != NULL; - ph = TAILQ_NEXT(ph, ph_pagelist)) - if (TAILQ_FIRST(&ph->ph_itemlist) != NULL) - break; - - pp->pr_curpage = ph; - } + pool_update_curpage(pp); } /* - * Allocate and initialize a pool. + * 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. */ -struct pool * -pool_create(size, align, ioff, nitems, wchan, pagesz, alloc, release, mtype) - size_t size; - u_int align; - u_int ioff; - int nitems; - const char *wchan; - size_t pagesz; - void *(*alloc) __P((unsigned long, int, int)); - void (*release) __P((void *, unsigned long, int)); - int mtype; +void +pool_init(struct pool *pp, size_t size, u_int align, u_int ioff, int flags, + const char *wchan, struct pool_allocator *palloc) { - struct pool *pp; - int flags; - - pp = (struct pool *)malloc(sizeof(*pp), M_POOL, M_NOWAIT); - if (pp == NULL) - return (NULL); + int off, slack; - flags = PR_FREEHEADER; #ifdef POOL_DIAGNOSTIC + /* + * Always log if POOL_DIAGNOSTIC is defined. + */ if (pool_logsize != 0) flags |= PR_LOGGING; #endif - pool_init(pp, size, align, ioff, flags, wchan, pagesz, - alloc, release, mtype); - - if (nitems != 0) { - if (pool_prime(pp, nitems, NULL) != 0) { - pool_destroy(pp); - return (NULL); - } +#ifdef POOL_SUBPAGE + /* + * XXX We don't provide a real `nointr' back-end + * yet; all sub-pages come from a kmem back-end. + * maybe some day... + */ + if (palloc == NULL) { + extern struct pool_allocator pool_allocator_kmem_subpage; + palloc = &pool_allocator_kmem_subpage; } + /* + * We'll assume any user-specified back-end allocator + * will deal with sub-pages, or simply don't care. + */ +#else + if (palloc == NULL) + palloc = &pool_allocator_kmem; +#endif /* POOL_SUBPAGE */ + if ((palloc->pa_flags & PA_INITIALIZED) == 0) { + if (palloc->pa_pagesz == 0) { +#ifdef POOL_SUBPAGE + if (palloc == &pool_allocator_kmem) + palloc->pa_pagesz = PAGE_SIZE; + else + palloc->pa_pagesz = POOL_SUBPAGE; +#else + palloc->pa_pagesz = PAGE_SIZE; +#endif /* POOL_SUBPAGE */ + } - return (pp); -} + TAILQ_INIT(&palloc->pa_list); -/* - * 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(pp, size, align, ioff, flags, wchan, pagesz, alloc, release, mtype) - struct pool *pp; - size_t size; - u_int align; - u_int ioff; - int flags; - const char *wchan; - size_t pagesz; - void *(*alloc) __P((unsigned long, int, int)); - void (*release) __P((void *, unsigned long, int)); - int mtype; -{ - int off, slack, i; - - /* - * Check arguments and construct default values. - */ - if (!powerof2(pagesz) || pagesz > PAGE_SIZE) - panic("pool_init: page size invalid (%lx)\n", (u_long)pagesz); - - if (alloc == NULL && release == NULL) { - alloc = pool_page_alloc; - release = pool_page_free; - pagesz = PAGE_SIZE; /* Rounds to PAGE_SIZE anyhow. */ - } else if ((alloc != NULL && release != NULL) == 0) { - /* If you specifiy one, must specify both. */ - panic("pool_init: must specify alloc and release together"); - } - - if (pagesz == 0) - pagesz = PAGE_SIZE; + 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); @@ -366,10 +417,20 @@ pool_init(pp, size, align, ioff, flags, 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. */ - TAILQ_INIT(&pp->pr_pagelist); + 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; @@ -377,22 +438,20 @@ pool_init(pp, size, align, ioff, flags, pp->pr_maxpages = UINT_MAX; pp->pr_roflags = flags; pp->pr_flags = 0; - pp->pr_size = ALIGN(size); + pp->pr_size = size; pp->pr_align = align; pp->pr_wchan = wchan; - pp->pr_mtype = mtype; - pp->pr_alloc = alloc; - pp->pr_free = release; - pp->pr_pagesz = pagesz; - pp->pr_pagemask = ~(pagesz - 1); - pp->pr_pageshift = ffs(pagesz) - 1; + 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 = 0; - memset(&pp->pr_hardlimit_warning_last, 0, - sizeof(pp->pr_hardlimit_warning_last)); + 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_drain_hook = NULL; + pp->pr_drain_hook_arg = NULL; /* * Decide whether to put the page header off page to avoid @@ -401,18 +460,16 @@ pool_init(pp, size, align, ioff, flags, * 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 < pagesz/16) { + 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 = - pagesz - ALIGN(sizeof(struct pool_item_header)); + 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 = pagesz; - for (i = 0; i < PR_HASHTABSIZE; i++) { - LIST_INIT(&pp->pr_hashtab[i]); - } + off = palloc->pa_pagesz; + SPLAY_INIT(&pp->pr_phtree); } /* @@ -424,6 +481,7 @@ pool_init(pp, size, align, ioff, flags, */ 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 @@ -442,104 +500,156 @@ pool_init(pp, size, align, ioff, flags, pp->pr_nidle = 0; #ifdef POOL_DIAGNOSTIC - if ((flags & PR_LOGGING) != 0) { - pp->pr_log = malloc(pool_logsize * sizeof(struct pool_log), - M_TEMP, M_NOWAIT); - if (pp->pr_log == NULL) + 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 if we haven't done so yet. + * Initialize private page header pool and cache magazine pool if we + * haven't done so yet. * XXX LOCKING. */ if (phpool.pr_size == 0) { +#ifdef POOL_SUBPAGE + pool_init(&phpool, sizeof(struct pool_item_header), 0, 0, 0, + "phpool", &pool_allocator_kmem); + pool_init(&psppool, POOL_SUBPAGE, POOL_SUBPAGE, 0, + PR_RECURSIVE, "psppool", &pool_allocator_kmem); +#else pool_init(&phpool, sizeof(struct pool_item_header), 0, 0, - 0, "phpool", 0, 0, 0, 0); + 0, "phpool", NULL); +#endif + pool_init(&pcgpool, sizeof(struct pool_cache_group), 0, 0, + 0, "pcgpool", NULL); } /* Insert 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 this 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); } /* * De-commision a pool resource. */ void -pool_destroy(pp) - struct pool *pp; +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); - panic("pool_destroy: pool busy: still out: %u\n", + pr_printlog(pp, NULL, printf); + panic("pool_destroy: pool busy: still out: %u", pp->pr_nout); } #endif /* Remove all pages */ - if ((pp->pr_roflags & PR_STATIC) == 0) - while ((ph = pp->pr_pagelist.tqh_first) != NULL) - pr_rmpage(pp, ph); + 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); - /* XXX Only clear this if we were drainpp? */ - drainpp = NULL; + if (drainpp == pp) { + drainpp = NULL; + } simple_unlock(&pool_head_slock); #ifdef POOL_DIAGNOSTIC if ((pp->pr_roflags & PR_LOGGING) != 0) free(pp->pr_log, M_TEMP); #endif +} - if (pp->pr_roflags & PR_FREEHEADER) - free(pp, M_POOL); +void +pool_set_drain_hook(struct pool *pp, void (*fn)(void *, int), void *arg) +{ + + /* XXX no locking -- must be used just after pool_init() */ +#ifdef DIAGNOSTIC + if (pp->pr_drain_hook != NULL) + panic("pool_set_drain_hook(%s): already set", pp->pr_wchan); +#endif + pp->pr_drain_hook = fn; + pp->pr_drain_hook_arg = arg; } +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 = splvm(); + ph = pool_get(&phpool, flags); + splx(s); + } + + return (ph); +} /* * Grab an item from the pool; must be called at appropriate spl level */ -#ifdef POOL_DIAGNOSTIC void * -_pool_get(pp, flags, file, line) - struct pool *pp; - int flags; - const char *file; - long line; +#ifdef POOL_DIAGNOSTIC +_pool_get(struct pool *pp, int flags, const char *file, long line) #else -void * -pool_get(pp, flags) - struct pool *pp; - int flags; +pool_get(struct pool *pp, int flags) #endif { - void *v; struct pool_item *pi; struct pool_item_header *ph; + void *v; #ifdef DIAGNOSTIC - if ((pp->pr_roflags & PR_STATIC) && (flags & PR_MALLOCOK)) { - pr_printlog(pp); - panic("pool_get: static"); - } + if (__predict_false(curlwp == NULL && doing_shutdown == 0 && + (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 - - if (curproc == NULL && (flags & PR_WAITOK) != 0) - panic("pool_get: must have NOWAIT"); +#endif /* DIAGNOSTIC */ simple_lock(&pp->pr_slock); + pr_enter(pp, file, line); startover: /* @@ -548,44 +658,51 @@ pool_get(pp, flags) * the pool. */ #ifdef DIAGNOSTIC - if (pp->pr_nout > pp->pr_hardlimit) { + 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 (pp->pr_nout == pp->pr_hardlimit) { - if (flags & PR_WAITOK) { + if (__predict_false(pp->pr_nout == pp->pr_hardlimit)) { + if (pp->pr_drain_hook != NULL) { /* - * XXX: A warning isn't logged in this case. Should - * it be? + * Since the drain hook is going to free things + * back to the pool, unlock, call the hook, re-lock, + * and check the hardlimit condition again. */ - pp->pr_flags |= PR_WANTED; + pr_leave(pp); simple_unlock(&pp->pr_slock); - tsleep((caddr_t)pp, PSWP, pp->pr_wchan, 0); + (*pp->pr_drain_hook)(pp->pr_drain_hook_arg, flags); simple_lock(&pp->pr_slock); - goto startover; + pr_enter(pp, file, line); + if (pp->pr_nout < pp->pr_hardlimit) + goto startover; } - if (pp->pr_hardlimit_warning != NULL) { + + if ((flags & PR_WAITOK) && !(flags & PR_LIMITFAIL)) { /* - * Log a message that the hard limit has been hit. + * XXX: A warning isn't logged in this case. Should + * it be? */ - struct timeval curtime, logdiff; - int s = splclock(); - curtime = mono_time; - splx(s); - timersub(&curtime, &pp->pr_hardlimit_warning_last, - &logdiff); - if (logdiff.tv_sec >= pp->pr_hardlimit_ratecap) { - pp->pr_hardlimit_warning_last = curtime; - log(LOG_ERR, "%s\n", pp->pr_hardlimit_warning); - } + 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; } - if (flags & PR_URGENT) - panic("pool_get: urgent"); + /* + * 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); } @@ -597,14 +714,12 @@ pool_get(pp, flags) * has no items in its bucket. */ if ((ph = pp->pr_curpage) == NULL) { - void *v; - #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\n"); + panic("pool_get: nitems inconsistent"); } #endif @@ -613,25 +728,30 @@ pool_get(pp, flags) * Release the pool lock, as the back-end page allocator * may block. */ + pr_leave(pp); simple_unlock(&pp->pr_slock); - v = (*pp->pr_alloc)(pp->pr_pagesz, flags, pp->pr_mtype); + 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); - if (v == NULL) { /* - * We were unable to allocate a page, but - * we released the lock during allocation, - * so perhaps items were freed back to the - * pool. Check for this case. + * 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_URGENT) - panic("pool_get: urgent"); - if ((flags & PR_WAITOK) == 0) { pp->pr_nfail++; + pr_leave(pp); simple_unlock(&pp->pr_slock); return (NULL); } @@ -639,46 +759,46 @@ pool_get(pp, flags) /* * Wait for items to be returned to this pool. * - * XXX: we actually want to wait just until - * the page allocator has memory again. Depending - * on this pool's usage, we might get stuck here - * for a long time. - * * XXX: maybe we should wake up once a second and * try again? */ pp->pr_flags |= PR_WANTED; - simple_unlock(&pp->pr_slock); - tsleep((caddr_t)pp, PSWP, pp->pr_wchan, 0); - simple_lock(&pp->pr_slock); + /* 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++; - pool_prime_page(pp, v); /* Start the allocation process over. */ goto startover; } - - if ((v = pi = TAILQ_FIRST(&ph->ph_itemlist)) == NULL) { + 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 (pp->pr_nitems == 0) { + 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\n"); + panic("pool_get: nitems inconsistent"); } #endif + +#ifdef POOL_DIAGNOSTIC pr_log(pp, v, PRLOG_GET, file, line); +#endif #ifdef DIAGNOSTIC - if (pi->pi_magic != PI_MAGIC) { - pr_printlog(pp); + 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\n", pp->pr_wchan, pi->pi_magic, ph->ph_page, pi); @@ -693,39 +813,35 @@ pool_get(pp, flags) pp->pr_nout++; if (ph->ph_nmissing == 0) { #ifdef DIAGNOSTIC - if (pp->pr_nidle == 0) + 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_FIRST(&ph->ph_itemlist) == NULL) { + if (TAILQ_EMPTY(&ph->ph_itemlist)) { #ifdef DIAGNOSTIC - if (ph->ph_nmissing != pp->pr_itemsperpage) { + 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 /* - * Find a new non-empty page header, if any. - * Start search from the page head, to increase - * the chance for "high water" pages to be freed. - * - * Migrate empty pages to the end of the list. This - * will speed the update of curpage as pages become - * idle. Empty pages intermingled with idle pages - * is no big deal. As soon as a page becomes un-empty, - * it will move back to the head of the list. + * This page is now full. Move it to the full list + * and select a new current page. */ - TAILQ_REMOVE(&pp->pr_pagelist, ph, ph_pagelist); - TAILQ_INSERT_TAIL(&pp->pr_pagelist, ph, ph_pagelist); - for (ph = TAILQ_FIRST(&pp->pr_pagelist); ph != NULL; - ph = TAILQ_NEXT(ph, ph_pagelist)) - if (TAILQ_FIRST(&ph->ph_itemlist) != NULL) - break; - - pp->pr_curpage = ph; + LIST_REMOVE(ph, ph_pagelist); + LIST_INSERT_HEAD(&pp->pr_fullpages, ph, ph_pagelist); + pool_update_curpage(pp); } pp->pr_nget++; @@ -734,7 +850,7 @@ pool_get(pp, flags) * If we have a low water mark and we are now below that low * water mark, add more items to the pool. */ - if (pp->pr_nitems < pp->pr_minitems && pool_catchup(pp) != 0) { + 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 @@ -742,50 +858,64 @@ pool_get(pp, flags) */ } + pr_leave(pp); simple_unlock(&pp->pr_slock); return (v); } /* - * Return resource to the pool; must be called at appropriate spl level + * Internal version of pool_put(). Pool is already locked/entered. */ -#ifdef POOL_DIAGNOSTIC -void -_pool_put(pp, v, file, line) - struct pool *pp; - void *v; - const char *file; - long line; -#else -void -pool_put(pp, v) - struct pool *pp; - void *v; -#endif +static void +pool_do_put(struct pool *pp, void *v) { struct pool_item *pi = v; struct pool_item_header *ph; caddr_t page; int s; - page = (caddr_t)((u_long)v & pp->pr_pagemask); + LOCK_ASSERT(simple_lock_held(&pp->pr_slock)); - simple_lock(&pp->pr_slock); + page = (caddr_t)((u_long)v & pp->pr_alloc->pa_pagemask); - pr_log(pp, v, PRLOG_PUT, file, line); +#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 ((ph = pr_find_pagehead(pp, page)) == NULL) { - pr_printlog(pp); + 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); + KDASSERT(ph->ph_nmissing != 0); ph->ph_nmissing--; pp->pr_nput++; pp->pr_nitems++; @@ -799,32 +929,34 @@ pool_put(pp, v) pp->pr_flags &= ~PR_WANTED; if (ph->ph_nmissing == 0) pp->pr_nidle++; - simple_unlock(&pp->pr_slock); wakeup((caddr_t)pp); return; } /* - * If this page is now complete, do one of two things: + * If this page is now empty, do one of two things: + * + * (1) If we have more pages than the page high water mark, + * or if we are flagged as immediately freeing back idle + * pages, free the page back to the system. ONLY CONSIDER + * FREEING BACK A PAGE IF WE HAVE MORE THAN OUR MINIMUM PAGE + * CLAIM. * - * (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. * - * (2) Move it to the end of the page list, so that - * we minimize our chances of fragmenting the - * pool. Idle pages migrate to the end (along with - * completely empty pages, so that we find un-empty - * pages more quickly when we update curpage) of the - * list so they can be more easily swept up by - * the pagedaemon when pages are scarce. + * 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_npages > pp->pr_maxpages) { - pr_rmpage(pp, ph); + if (pp->pr_npages > pp->pr_minpages && + (pp->pr_npages > pp->pr_maxpages || + (pp->pr_roflags & PR_IMMEDRELEASE) != 0 || + (pp->pr_alloc->pa_flags & PA_WANT) != 0)) { + pr_rmpage(pp, ph, NULL); } else { - TAILQ_REMOVE(&pp->pr_pagelist, ph, ph_pagelist); - TAILQ_INSERT_TAIL(&pp->pr_pagelist, ph, ph_pagelist); + LIST_REMOVE(ph, ph_pagelist); + LIST_INSERT_HEAD(&pp->pr_emptypages, ph, ph_pagelist); /* * Update the timestamp on the page. A page must @@ -835,85 +967,91 @@ pool_put(pp, v) s = splclock(); ph->ph_time = mono_time; splx(s); - - /* - * Update the current page pointer. Just look for - * the first page with any free items. - * - * XXX: Maybe we want an option to look for the - * page with the fewest available items, to minimize - * fragmentation? - */ - for (ph = TAILQ_FIRST(&pp->pr_pagelist); ph != NULL; - ph = TAILQ_NEXT(ph, ph_pagelist)) - if (TAILQ_FIRST(&ph->ph_itemlist) != NULL) - break; - - pp->pr_curpage = ph; } + pool_update_curpage(pp); } + /* - * If the page has just become un-empty, move it to the head of - * the list, and make it the current page. The next allocation - * will get the item from this page, instead of further fragmenting - * the pool. + * 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)) { - TAILQ_REMOVE(&pp->pr_pagelist, ph, ph_pagelist); - TAILQ_INSERT_HEAD(&pp->pr_pagelist, ph, ph_pagelist); + 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(pp, n, storage) - struct pool *pp; - int n; - caddr_t storage; +pool_prime(struct pool *pp, int n) { + struct pool_item_header *ph = NULL; caddr_t cp; - int newnitems, newpages; - -#ifdef DIAGNOSTIC - if (storage && !(pp->pr_roflags & PR_STATIC)) - panic("pool_prime: static"); - /* !storage && static caught below */ -#endif + int newpages; simple_lock(&pp->pr_slock); - newnitems = pp->pr_minitems + n; - newpages = - roundup(newnitems, pp->pr_itemsperpage) / pp->pr_itemsperpage - - pp->pr_minpages; + newpages = roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage; while (newpages-- > 0) { - if (pp->pr_roflags & PR_STATIC) { - cp = storage; - storage += pp->pr_pagesz; - } else { - simple_unlock(&pp->pr_slock); - cp = (*pp->pr_alloc)(pp->pr_pagesz, 0, pp->pr_mtype); - simple_lock(&pp->pr_slock); - } + 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 (cp == NULL) { - simple_unlock(&pp->pr_slock); - return (ENOMEM); + if (__predict_false(cp == NULL || ph == NULL)) { + if (cp != NULL) + pool_allocator_free(pp, cp); + break; } - pool_prime_page(pp, cp); + pool_prime_page(pp, cp, ph); + pp->pr_npagealloc++; pp->pr_minpages++; } - pp->pr_minitems = newnitems; - if (pp->pr_minpages >= pp->pr_maxpages) pp->pr_maxpages = pp->pr_minpages + 1; /* XXX */ @@ -927,35 +1065,32 @@ pool_prime(pp, n, storage) * Note, we must be called with the pool descriptor LOCKED. */ static void -pool_prime_page(pp, storage) - struct pool *pp; - caddr_t storage; +pool_prime_page(struct pool *pp, caddr_t storage, struct pool_item_header *ph) { struct pool_item *pi; - struct pool_item_header *ph; caddr_t cp = storage; unsigned int align = pp->pr_align; unsigned int ioff = pp->pr_itemoffset; - int s, n; + int n; + int s; - if ((pp->pr_roflags & PR_PHINPAGE) != 0) { - ph = (struct pool_item_header *)(cp + pp->pr_phoffset); - } else { - s = splhigh(); - ph = pool_get(&phpool, PR_URGENT); - splx(s); - LIST_INSERT_HEAD(&pp->pr_hashtab[PR_HASH_INDEX(pp, cp)], - ph, ph_hashlist); - } +#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. */ - TAILQ_INSERT_HEAD(&pp->pr_pagelist, ph, ph_pagelist); + 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)); + s = splclock(); + ph->ph_time = mono_time; + splx(s); + if ((pp->pr_roflags & PR_PHINPAGE) == 0) + SPLAY_INSERT(phtree, &pp->pr_phtree, ph); pp->pr_nidle++; @@ -981,6 +1116,8 @@ pool_prime_page(pp, storage) 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 @@ -1000,37 +1137,22 @@ pool_prime_page(pp, storage) } /* - * Like pool_prime(), except this is used by pool_get() when nitems - * drops below the low water mark. This is used to catch up nitmes - * with the low water mark. + * 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, this doesn't work with static pools. - * - * Note 3, we must be called with the pool already locked, and we return + * Note 2, we must be called with the pool already locked, and we return * with it locked. */ static int -pool_catchup(pp) - struct pool *pp; +pool_catchup(struct pool *pp) { + struct pool_item_header *ph = NULL; caddr_t cp; int error = 0; - if (pp->pr_roflags & PR_STATIC) { - /* - * We dropped below the low water mark, and this is not a - * good thing. Log a warning. - * - * XXX: rate-limit this? - */ - printf("WARNING: static pool `%s' dropped below low water " - "mark\n", pp->pr_wchan); - return (0); - } - - while (pp->pr_nitems < pp->pr_minitems) { + while (POOL_NEEDS_CATCHUP(pp)) { /* * Call the page back-end allocator for more memory. * @@ -1038,24 +1160,36 @@ pool_catchup(pp) * the pool descriptor? */ simple_unlock(&pp->pr_slock); - cp = (*pp->pr_alloc)(pp->pr_pagesz, 0, pp->pr_mtype); + 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 (cp == NULL) { + if (__predict_false(cp == NULL || ph == NULL)) { + if (cp != NULL) + pool_allocator_free(pp, cp); error = ENOMEM; break; } - pool_prime_page(pp, cp); + pool_prime_page(pp, cp, ph); + pp->pr_npagealloc++; } return (error); } +static 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(pp, n) - pool_handle_t pp; - int n; +pool_setlowat(struct pool *pp, int n) { - int error; simple_lock(&pp->pr_slock); @@ -1065,7 +1199,7 @@ pool_setlowat(pp, n) : roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage; /* Make sure we're caught up with the newly-set low water mark. */ - if ((error = pool_catchup(pp)) != 0) { + 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 @@ -1077,9 +1211,7 @@ pool_setlowat(pp, n) } void -pool_sethiwat(pp, n) - pool_handle_t pp; - int n; +pool_sethiwat(struct pool *pp, int n) { simple_lock(&pp->pr_slock); @@ -1092,20 +1224,16 @@ pool_sethiwat(pp, n) } void -pool_sethardlimit(pp, n, warnmess, ratecap) - pool_handle_t pp; - int n; - const char *warnmess; - int ratecap; +pool_sethardlimit(struct pool *pp, int n, const char *warnmess, int ratecap) { simple_lock(&pp->pr_slock); pp->pr_hardlimit = n; pp->pr_hardlimit_warning = warnmess; - pp->pr_hardlimit_ratecap = ratecap; - memset(&pp->pr_hardlimit_warning_last, 0, - sizeof(pp->pr_hardlimit_warning_last)); + 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 @@ -1119,105 +1247,87 @@ pool_sethardlimit(pp, n, warnmess, ratec } /* - * Default page allocator. - */ -static void * -pool_page_alloc(sz, flags, mtype) - unsigned long sz; - int flags; - int mtype; -{ - boolean_t waitok = (flags & PR_WAITOK) ? TRUE : FALSE; - - return ((void *)uvm_km_alloc_poolpage(waitok)); -} - -static void -pool_page_free(v, sz, mtype) - void *v; - unsigned long sz; - int mtype; -{ - - uvm_km_free_poolpage((vaddr_t)v); -} - -/* - * Alternate pool page allocator for pools that know they will - * never be accessed in interrupt context. - */ -void * -pool_page_alloc_nointr(sz, flags, mtype) - unsigned long sz; - int flags; - int mtype; -{ - boolean_t waitok = (flags & PR_WAITOK) ? TRUE : FALSE; - - return ((void *)uvm_km_alloc_poolpage1(kernel_map, uvm.kernel_object, - waitok)); -} - -void -pool_page_free_nointr(v, sz, mtype) - void *v; - unsigned long sz; - int mtype; -{ - - uvm_km_free_poolpage1(kernel_map, (vaddr_t)v); -} - - -/* * Release all complete pages that have not been used recently. */ -void -pool_reclaim(pp) - pool_handle_t pp; +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 (pp->pr_roflags & PR_STATIC) - return; + if (pp->pr_drain_hook != NULL) { + /* + * The drain hook must be called with the pool unlocked. + */ + (*pp->pr_drain_hook)(pp->pr_drain_hook_arg, PR_NOWAIT); + } if (simple_lock_try(&pp->pr_slock) == 0) - return; + 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); s = splclock(); curtime = mono_time; splx(s); - for (ph = TAILQ_FIRST(&pp->pr_pagelist); ph != NULL; ph = phnext) { - phnext = TAILQ_NEXT(ph, ph_pagelist); + 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; - if (ph->ph_nmissing == 0) { - struct timeval diff; - timersub(&curtime, &ph->ph_time, &diff); - if (diff.tv_sec < pool_inactive_time) - continue; + 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; + /* + * 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); - } + 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 = splvm(); + pool_put(&phpool, ph); + splx(s); + } + return (1); +} /* * Drain pools, one at a time. @@ -1225,133 +1335,778 @@ pool_reclaim(pp) * Note, we must never be called from an interrupt context. */ void -pool_drain(arg) - void *arg; +pool_drain(void *arg) { struct pool *pp; int s; - s = splimp(); + pp = NULL; + s = splvm(); simple_lock(&pool_head_slock); - - if (drainpp == NULL && (drainpp = TAILQ_FIRST(&pool_head)) == NULL) - goto out; - - pp = drainpp; - drainpp = TAILQ_NEXT(pp, pr_poollist); - - pool_reclaim(pp); - - out: + if (drainpp == NULL) { + drainpp = TAILQ_FIRST(&pool_head); + } + if (drainpp) { + pp = drainpp; + drainpp = TAILQ_NEXT(pp, pr_poollist); + } simple_unlock(&pool_head_slock); + pool_reclaim(pp); splx(s); } - -#if defined(POOL_DIAGNOSTIC) || defined(DEBUG) /* * Diagnostic helpers. */ void -pool_print(pp, label) - struct pool *pp; - const char *label; +pool_print(struct pool *pp, const char *modif) { int s; - s = splimp(); - simple_lock(&pp->pr_slock); - pool_print1(pp, label); + s = splvm(); + if (simple_lock_try(&pp->pr_slock) == 0) { + printf("pool %s is locked; try again later\n", + pp->pr_wchan); + splx(s); + return; + } + pool_print1(pp, modif, printf); simple_unlock(&pp->pr_slock); splx(s); } -static void -pool_print1(pp, label) - struct pool *pp; - const char *label; +void +pool_printit(struct pool *pp, const char *modif, void (*pr)(const char *, ...)) { + int didlock = 0; - if (label != NULL) - printf("%s: ", label); + if (pp == NULL) { + (*pr)("Must specify a pool to print.\n"); + return; + } + + /* + * Called from DDB; interrupts should be blocked, and all + * other processors should be paused. We can skip locking + * the pool in this case. + * + * We do a simple_lock_try() just to print the lock + * status, however. + */ - printf("pool %s: nalloc %lu nfree %lu npagealloc %lu npagefree %lu\n" - " npages %u minitems %u itemsperpage %u itemoffset %u\n" - " nidle %lu\n", - pp->pr_wchan, - pp->pr_nget, - pp->pr_nput, - pp->pr_npagealloc, - pp->pr_npagefree, - pp->pr_npages, - pp->pr_minitems, - pp->pr_itemsperpage, - pp->pr_itemoffset, - pp->pr_nidle); + if (simple_lock_try(&pp->pr_slock) == 0) + (*pr)("WARNING: pool %s is locked\n", pp->pr_wchan); + else + didlock = 1; + + pool_print1(pp, modif, pr); + + if (didlock) + simple_unlock(&pp->pr_slock); } -int -pool_chk(pp, label) - struct pool *pp; - char *label; +static void +pool_print_pagelist(struct pool_pagelist *pl, void (*pr)(const char *, ...)) { struct pool_item_header *ph; - int r = 0; +#ifdef DIAGNOSTIC + struct pool_item *pi; +#endif - simple_lock(&pp->pr_slock); + 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 + } +} - for (ph = TAILQ_FIRST(&pp->pr_pagelist); ph != NULL; - ph = TAILQ_NEXT(ph, ph_pagelist)) { +static void +pool_print1(struct pool *pp, const char *modif, void (*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; + } + + (*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); - struct pool_item *pi; - int n; - caddr_t page; - - page = (caddr_t)((u_long)ph & pp->pr_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); - r++; - goto out; + 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++) { + if (pcg->pcg_objects[i].pcgo_pa != + POOL_PADDR_INVALID) { + (*pr)("\t\t\t%p, 0x%llx\n", + pcg->pcg_objects[i].pcgo_va, + (unsigned long long) + pcg->pcg_objects[i].pcgo_pa); + } else { + (*pr)("\t\t\t%p\n", + pcg->pcg_objects[i].pcgo_va); + } + } } + } - for (pi = TAILQ_FIRST(&ph->ph_itemlist), n = 0; - pi != NULL; - pi = TAILQ_NEXT(pi,pi_list), n++) { + skip_cache: + pr_enter_check(pp, pr); +} -#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_pagemask); - if (page == ph->ph_page) - continue; +static 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(%p:%s): page inconsistency: page %p;" - " item ordinal %d; addr %p (p %p)\n", pp, - pp->pr_wchan, ph->ph_page, + 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); - r++; + 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_DIAGNOSTIC || DEBUG */ + +/* + * 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, paddr_t *pap) +{ + 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].pcgo_va != NULL); + object = pcg->pcg_objects[idx].pcgo_va; + if (pap != NULL) + *pap = pcg->pcg_objects[idx].pcgo_pa; + pcg->pcg_objects[idx].pcgo_va = NULL; + + return (object); +} + +static __inline void +pcg_put(struct pool_cache_group *pcg, void *object, paddr_t pa) +{ + u_int idx; + + KASSERT(pcg->pcg_avail < PCG_NOBJECTS); + idx = pcg->pcg_avail++; + + KASSERT(pcg->pcg_objects[idx].pcgo_va == NULL); + pcg->pcg_objects[idx].pcgo_va = object; + pcg->pcg_objects[idx].pcgo_pa = pa; +} + +/* + * pool_cache_get{,_paddr}: + * + * Get an object from a pool cache (optionally returning + * the physical address of the object). + */ +void * +pool_cache_get_paddr(struct pool_cache *pc, int flags, paddr_t *pap) +{ + 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); + } + } + if (object != NULL && pap != NULL) { +#ifdef POOL_VTOPHYS + *pap = POOL_VTOPHYS(object); +#else + *pap = POOL_PADDR_INVALID; +#endif + } + return (object); + } + + have_group: + pc->pc_hits++; + pc->pc_nitems--; + object = pcg_get(pcg, pap); + + if (pcg->pcg_avail == 0) + pc->pc_allocfrom = NULL; + + simple_unlock(&pc->pc_slock); + + return (object); +} + +/* + * pool_cache_put{,_paddr}: + * + * Put an object back to the pool cache (optionally caching the + * physical address of the object). + */ +void +pool_cache_put_paddr(struct pool_cache *pc, void *object, paddr_t pa) +{ + 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, pa); + + 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(). + */ +static 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, NULL); + 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(). + */ +static 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); +} + +/* + * Pool backend allocators. + * + * Each pool has a backend allocator that handles allocation, deallocation, + * and any additional draining that might be needed. + * + * We provide two standard allocators: + * + * pool_allocator_kmem - the default when no allocator is specified + * + * pool_allocator_nointr - used for pools that will not be accessed + * in interrupt context. + */ +void *pool_page_alloc(struct pool *, int); +void pool_page_free(struct pool *, void *); + +struct pool_allocator pool_allocator_kmem = { + pool_page_alloc, pool_page_free, 0, +}; + +void *pool_page_alloc_nointr(struct pool *, int); +void pool_page_free_nointr(struct pool *, void *); + +struct pool_allocator pool_allocator_nointr = { + pool_page_alloc_nointr, pool_page_free_nointr, 0, +}; + +#ifdef POOL_SUBPAGE +void *pool_subpage_alloc(struct pool *, int); +void pool_subpage_free(struct pool *, void *); + +struct pool_allocator pool_allocator_kmem_subpage = { + pool_subpage_alloc, pool_subpage_free, 0, +}; +#endif /* POOL_SUBPAGE */ + +/* + * 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. + * Finally, 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 wait channels, so we have to employ another strategy. + * + * The caller sleeps on the pool (so that it 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 wake up all sleeping pools belonging to this allocator. + * + * XXX Thundering herd. + */ +void * +pool_allocator_alloc(struct pool *org, int flags) +{ + struct pool_allocator *pa = org->pr_alloc; + struct pool *pp, *start; + int s, freed; + void *res; + + do { + if ((res = (*pa->pa_alloc)(org, flags)) != NULL) + return (res); + if ((flags & PR_WAITOK) == 0) { + /* + * We only run the drain hookhere if PR_NOWAIT. + * In other cases, the hook will be run in + * pool_reclaim(). + */ + if (org->pr_drain_hook != NULL) { + (*org->pr_drain_hook)(org->pr_drain_hook_arg, + flags); + if ((res = (*pa->pa_alloc)(org, flags)) != NULL) + return (res); + } + break; + } + + /* + * Drain all pools, except "org", that use this + * allocator. We do this to reclaim VA space. + * pa_alloc is responsible for waiting for + * physical memory. + * + * XXX We risk looping forever if start if someone + * calls pool_destroy on "start". But there is no + * other way to have potentially sleeping pool_reclaim, + * non-sleeping locks on pool_allocator, and some + * stirring of drained pools in the allocator. + * + * XXX Maybe we should use pool_head_slock for locking + * the allocators? + */ + freed = 0; + + s = splvm(); + simple_lock(&pa->pa_slock); + pp = start = TAILQ_FIRST(&pa->pa_list); + do { + TAILQ_REMOVE(&pa->pa_list, pp, pr_alloc_list); + TAILQ_INSERT_TAIL(&pa->pa_list, pp, pr_alloc_list); + if (pp == org) + continue; + simple_unlock(&pa->pa_slock); + freed = pool_reclaim(pp); + simple_lock(&pa->pa_slock); + } while ((pp = TAILQ_FIRST(&pa->pa_list)) != start && + freed == 0); + + if (freed == 0) { + /* + * We set PA_WANT here, the caller will most likely + * sleep waiting for pages (if not, this won't hurt + * that much), and there is no way to set this in + * the caller without violating locking order. + */ + pa->pa_flags |= PA_WANT; + } + simple_unlock(&pa->pa_slock); + splx(s); + } while (freed); + return (NULL); +} + +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 ((void *) uvm_km_alloc_poolpage(waitok)); +} + +void +pool_page_free(struct pool *pp, void *v) +{ + + uvm_km_free_poolpage((vaddr_t) v); +} + +#ifdef POOL_SUBPAGE +/* Sub-page allocator, for machines with large hardware pages. */ +void * +pool_subpage_alloc(struct pool *pp, int flags) +{ + + return (pool_get(&psppool, flags)); +} + +void +pool_subpage_free(struct pool *pp, void *v) +{ + + pool_put(&psppool, v); +} + +/* We don't provide a real nointr allocator. Maybe later. */ +void * +pool_page_alloc_nointr(struct pool *pp, int flags) +{ + + return (pool_subpage_alloc(pp, flags)); +} + +void +pool_page_free_nointr(struct pool *pp, void *v) +{ + + pool_subpage_free(pp, v); +} +#else +void * +pool_page_alloc_nointr(struct pool *pp, int flags) +{ + boolean_t waitok = (flags & PR_WAITOK) ? TRUE : FALSE; + + return ((void *) uvm_km_alloc_poolpage1(kernel_map, + uvm.kernel_object, waitok)); +} + +void +pool_page_free_nointr(struct pool *pp, void *v) +{ + + uvm_km_free_poolpage1(kernel_map, (vaddr_t) v); +} +#endif /* POOL_SUBPAGE */