/* $OpenBSD: subr_pool.c,v 1.1 1999/02/26 03:13:30 art Exp $ */ /* $NetBSD: subr_pool.c,v 1.17 1998/12/27 21:13:43 thorpej Exp $ */ /*- * Copyright (c) 1997 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Paul Kranenburg. * * 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 #if defined(UVM) #include #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 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'). * */ /* List of all pools */ TAILQ_HEAD(,pool) pool_head = { NULL, &(pool_head).tqh_first }; /* Private pool for page header structures */ static struct pool phpool; /* # of seconds to retain page after last use */ int pool_inactive_time = 10; /* Next candidate for drainage (see pool_drain()) */ static struct pool *drainpp = NULL; struct pool_item_header { /* Page headers */ TAILQ_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 */ 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 #endif /* Other entries use only this list entry */ TAILQ_ENTRY(pool_item) pi_list; }; #define PR_HASH_INDEX(pp,addr) \ (((u_long)(addr) >> (pp)->pr_pageshift) & (PR_HASHTABSIZE - 1)) 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_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)); #ifdef POOL_DIAGNOSTIC /* * Pool log entry. An array of these is allocated in pool_create(). */ 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; 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; { int n = pp->pr_curlogentry; struct pool_log *pl; if ((pp->pr_flags & 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(pp) struct pool *pp; { int i = pp->pr_logsize; int n = pp->pr_curlogentry; if ((pp->pr_flags & PR_LOGGING) == 0) return; pool_print(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 (++n >= pp->pr_logsize) n = 0; } } #else #define pr_log(pp, v, action, file, line) #define pr_printlog(pp) #endif /* * 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; { struct pool_item_header *ph; if ((pp->pr_flags & 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); } /* * Remove a page from the pool. */ static __inline__ void pr_rmpage(pp, ph) struct pool *pp; struct pool_item_header *ph; { /* * 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"); #endif pp->pr_nidle--; } /* * Unlink a page from the pool and release it. */ TAILQ_REMOVE(&pp->pr_pagelist, ph, ph_pagelist); (*pp->pr_free)(ph->ph_page, pp->pr_pagesz, pp->pr_mtype); pp->pr_npages--; pp->pr_npagefree++; if ((pp->pr_flags & PR_PHINPAGE) == 0) { LIST_REMOVE(ph, ph_hashlist); pool_put(&phpool, ph); } 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; } } /* * Allocate and initialize a pool. */ struct pool * pool_create(size, align, ioff, nitems, wchan, pagesz, alloc, release, mtype) size_t size; u_int align; u_int ioff; int nitems; char *wchan; size_t pagesz; void *(*alloc) __P((unsigned long, int, int)); void (*release) __P((void *, unsigned long, int)); int mtype; { struct pool *pp; int flags; pp = (struct pool *)malloc(sizeof(*pp), M_POOL, M_NOWAIT); if (pp == NULL) return (NULL); flags = PR_FREEHEADER; #ifdef POOL_DIAGNOSTIC 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); } } return (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(pp, size, align, ioff, flags, wchan, pagesz, alloc, release, mtype) struct pool *pp; size_t size; u_int align; u_int ioff; int flags; 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; if (align == 0) align = ALIGN(1); if (size < sizeof(struct pool_item)) size = sizeof(struct pool_item); /* * Initialize the pool structure. */ TAILQ_INSERT_TAIL(&pool_head, pp, pr_poollist); TAILQ_INIT(&pp->pr_pagelist); pp->pr_curpage = NULL; pp->pr_npages = 0; pp->pr_minitems = 0; pp->pr_minpages = 0; pp->pr_maxpages = UINT_MAX; pp->pr_flags = flags; pp->pr_size = ALIGN(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; /* * 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 < pagesz/16) { /* Use the end of the page for the page header */ pp->pr_flags |= PR_PHINPAGE; pp->pr_phoffset = off = 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]); } } /* * 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; /* * 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) != 0) { pp->pr_log = malloc(pool_logsize * sizeof(struct pool_log), M_TEMP, M_NOWAIT); if (pp->pr_log == NULL) pp->pr_flags &= ~PR_LOGGING; pp->pr_curlogentry = 0; pp->pr_logsize = pool_logsize; } #endif simple_lock_init(&pp->pr_lock); lockinit(&pp->pr_resourcelock, PSWP, wchan, 0, 0); /* * Initialize private page header pool if we haven't done so yet. */ if (phpool.pr_size == 0) { pool_init(&phpool, sizeof(struct pool_item_header), 0, 0, 0, "phpool", 0, 0, 0, 0); } return; } /* * De-commision a pool resource. */ void pool_destroy(pp) struct pool *pp; { struct pool_item_header *ph; #ifdef DIAGNOSTIC if (pp->pr_nget - pp->pr_nput != 0) { pr_printlog(pp); panic("pool_destroy: pool busy: still out: %lu\n", pp->pr_nget - pp->pr_nput); } #endif /* Remove all pages */ if ((pp->pr_flags & PR_STATIC) == 0) while ((ph = pp->pr_pagelist.tqh_first) != NULL) pr_rmpage(pp, ph); /* Remove from global pool list */ TAILQ_REMOVE(&pool_head, pp, pr_poollist); drainpp = NULL; #ifdef POOL_DIAGNOSTIC if ((pp->pr_flags & PR_LOGGING) != 0) free(pp->pr_log, M_TEMP); #endif if (pp->pr_flags & PR_FREEHEADER) free(pp, M_POOL); } /* * 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; #else void * pool_get(pp, flags) struct pool *pp; int flags; #endif { void *v; struct pool_item *pi; struct pool_item_header *ph; #ifdef DIAGNOSTIC if ((pp->pr_flags & PR_STATIC) && (flags & PR_MALLOCOK)) { pr_printlog(pp); panic("pool_get: static"); } #endif simple_lock(&pp->pr_lock); if (curproc == NULL && (flags & PR_WAITOK) != 0) panic("pool_get: must have NOWAIT"); /* * 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. */ while ((ph = pp->pr_curpage) == NULL) { void *v; int lkflags = LK_EXCLUSIVE | LK_INTERLOCK | ((flags & PR_WAITOK) == 0 ? LK_NOWAIT : 0); /* Get long-term lock on pool */ if (lockmgr(&pp->pr_resourcelock, lkflags, &pp->pr_lock, curproc /*XXX*/) != 0) return (NULL); /* Check if pool became non-empty while we slept */ if ((ph = pp->pr_curpage) != NULL) goto again; /* Call the page back-end allocator for more memory */ v = (*pp->pr_alloc)(pp->pr_pagesz, flags, pp->pr_mtype); if (v == NULL) { if (flags & PR_URGENT) panic("pool_get: urgent"); if ((flags & PR_WAITOK) == 0) { pp->pr_nfail++; lockmgr(&pp->pr_resourcelock, LK_RELEASE, NULL, curproc/*XXX*/); return (NULL); } /* * 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. */ pp->pr_flags |= PR_WANTED; lockmgr(&pp->pr_resourcelock, LK_RELEASE, NULL, curproc/*XXX*/); tsleep((caddr_t)pp, PSWP, pp->pr_wchan, 0); simple_lock(&pp->pr_lock); continue; } /* We have more memory; add it to the pool */ pp->pr_npagealloc++; pool_prime_page(pp, v); again: /* Re-acquire pool interlock */ simple_lock(&pp->pr_lock); lockmgr(&pp->pr_resourcelock, LK_RELEASE, NULL, curproc/*XXX*/); } if ((v = pi = TAILQ_FIRST(&ph->ph_itemlist)) == NULL) panic("pool_get: %s: page empty", pp->pr_wchan); pr_log(pp, v, PRLOG_GET, file, line); #ifdef DIAGNOSTIC if (pi->pi_magic != PI_MAGIC) { pr_printlog(pp); 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); } #endif /* * Remove from item list. */ TAILQ_REMOVE(&ph->ph_itemlist, pi, pi_list); if (ph->ph_nmissing == 0) { #ifdef DIAGNOSTIC if (pp->pr_nidle == 0) panic("pool_get: nidle inconsistent"); #endif pp->pr_nidle--; } ph->ph_nmissing++; if (TAILQ_FIRST(&ph->ph_itemlist) == NULL) { /* * 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. * * First, move the now empty page to the head of * the page list. */ TAILQ_REMOVE(&pp->pr_pagelist, ph, ph_pagelist); TAILQ_INSERT_HEAD(&pp->pr_pagelist, ph, ph_pagelist); while ((ph = TAILQ_NEXT(ph, ph_pagelist)) != NULL) if (TAILQ_FIRST(&ph->ph_itemlist) != NULL) break; pp->pr_curpage = ph; } pp->pr_nget++; simple_unlock(&pp->pr_lock); return (v); } /* * Return resource to the pool; must be called at appropriate spl level */ #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 { struct pool_item *pi = v; struct pool_item_header *ph; caddr_t page; page = (caddr_t)((u_long)v & pp->pr_pagemask); simple_lock(&pp->pr_lock); pr_log(pp, v, PRLOG_PUT, file, line); if ((ph = pr_find_pagehead(pp, page)) == NULL) { pr_printlog(pp); panic("pool_put: %s: page header missing", pp->pr_wchan); } /* * Return to item list. */ #ifdef DIAGNOSTIC pi->pi_magic = PI_MAGIC; #endif TAILQ_INSERT_HEAD(&ph->ph_itemlist, pi, pi_list); ph->ph_nmissing--; pp->pr_nput++; /* 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((caddr_t)pp); simple_unlock(&pp->pr_lock); return; } /* * If this page is now complete, move it to the end of the pagelist. * If this page has just become un-empty, move it the head. */ if (ph->ph_nmissing == 0) { pp->pr_nidle++; if (pp->pr_npages > pp->pr_maxpages) { #if 0 timeout(pool_drain, 0, pool_inactive_time*hz); #else pr_rmpage(pp, ph); #endif } else { TAILQ_REMOVE(&pp->pr_pagelist, ph, ph_pagelist); TAILQ_INSERT_TAIL(&pp->pr_pagelist, ph, ph_pagelist); ph->ph_time = time; /* XXX - update curpage */ 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; } } simple_unlock(&pp->pr_lock); } /* * Add N items to the pool. */ int pool_prime(pp, n, storage) struct pool *pp; int n; caddr_t storage; { caddr_t cp; int newnitems, newpages; #ifdef DIAGNOSTIC if (storage && !(pp->pr_flags & PR_STATIC)) panic("pool_prime: static"); /* !storage && static caught below */ #endif (void)lockmgr(&pp->pr_resourcelock, LK_EXCLUSIVE, NULL, curproc/*XXX*/); newnitems = pp->pr_minitems + n; newpages = roundup(pp->pr_itemsperpage,newnitems) / pp->pr_itemsperpage - pp->pr_minpages; while (newpages-- > 0) { if (pp->pr_flags & PR_STATIC) { cp = storage; storage += pp->pr_pagesz; } else { cp = (*pp->pr_alloc)(pp->pr_pagesz, 0, pp->pr_mtype); } if (cp == NULL) { (void)lockmgr(&pp->pr_resourcelock, LK_RELEASE, NULL, curproc/*XXX*/); return (ENOMEM); } pool_prime_page(pp, cp); pp->pr_minpages++; } pp->pr_minitems = newnitems; if (pp->pr_minpages >= pp->pr_maxpages) pp->pr_maxpages = pp->pr_minpages + 1; /* XXX */ (void)lockmgr(&pp->pr_resourcelock, LK_RELEASE, NULL, curproc/*XXX*/); return (0); } /* * Add a page worth of items to the pool. */ int pool_prime_page(pp, storage) struct pool *pp; caddr_t storage; { 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 n; simple_lock(&pp->pr_lock); if ((pp->pr_flags & PR_PHINPAGE) != 0) { ph = (struct pool_item_header *)(cp + pp->pr_phoffset); } else { ph = pool_get(&phpool, PR_URGENT); LIST_INSERT_HEAD(&pp->pr_hashtab[PR_HASH_INDEX(pp, cp)], ph, ph_hashlist); } /* * Insert page header. */ TAILQ_INSERT_HEAD(&pp->pr_pagelist, ph, ph_pagelist); TAILQ_INIT(&ph->ph_itemlist); ph->ph_page = storage; ph->ph_nmissing = 0; ph->ph_time.tv_sec = ph->ph_time.tv_usec = 0; 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; while (n--) { pi = (struct pool_item *)cp; /* 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; simple_unlock(&pp->pr_lock); return (0); } void pool_setlowat(pp, n) pool_handle_t pp; int n; { (void)lockmgr(&pp->pr_resourcelock, LK_EXCLUSIVE, NULL, curproc/*XXX*/); pp->pr_minitems = n; pp->pr_minpages = (n == 0) ? 0 : roundup(pp->pr_itemsperpage,n) / pp->pr_itemsperpage; (void)lockmgr(&pp->pr_resourcelock, LK_RELEASE, NULL, curproc/*XXX*/); } void pool_sethiwat(pp, n) pool_handle_t pp; int n; { (void)lockmgr(&pp->pr_resourcelock, LK_EXCLUSIVE, NULL, curproc/*XXX*/); pp->pr_maxpages = (n == 0) ? 0 : roundup(pp->pr_itemsperpage,n) / pp->pr_itemsperpage; (void)lockmgr(&pp->pr_resourcelock, LK_RELEASE, NULL, curproc/*XXX*/); } /* * 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; #if defined(UVM) return ((void *)uvm_km_alloc_poolpage(waitok)); #else return ((void *)kmem_alloc_poolpage(waitok)); #endif } static void pool_page_free(v, sz, mtype) void *v; unsigned long sz; int mtype; { #if defined(UVM) uvm_km_free_poolpage((vaddr_t)v); #else kmem_free_poolpage((vaddr_t)v); #endif } /* * 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; { #if defined(UVM) boolean_t waitok = (flags & PR_WAITOK) ? TRUE : FALSE; /* * With UVM, we can use the kernel_map. */ return ((void *)uvm_km_alloc_poolpage1(kernel_map, uvm.kernel_object, waitok)); #else /* * Can't do anything so cool with Mach VM. */ return (pool_page_alloc(sz, flags, mtype)); #endif } void pool_page_free_nointr(v, sz, mtype) void *v; unsigned long sz; int mtype; { #if defined(UVM) uvm_km_free_poolpage1(kernel_map, (vaddr_t)v); #else pool_page_free(v, sz, mtype); #endif } /* * Release all complete pages that have not been used recently. */ void pool_reclaim (pp) pool_handle_t pp; { struct pool_item_header *ph, *phnext; struct timeval curtime = time; if (pp->pr_flags & PR_STATIC) return; if (simple_lock_try(&pp->pr_lock) == 0) return; for (ph = TAILQ_FIRST(&pp->pr_pagelist); ph != NULL; ph = phnext) { phnext = TAILQ_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; pr_rmpage(pp, ph); } } simple_unlock(&pp->pr_lock); } /* * Drain pools, one at a time. */ void pool_drain(arg) void *arg; { struct pool *pp; int s = splimp(); /* XXX:lock pool head */ if (drainpp == NULL && (drainpp = TAILQ_FIRST(&pool_head)) == NULL) { splx(s); return; } pp = drainpp; drainpp = TAILQ_NEXT(pp, pr_poollist); /* XXX:unlock pool head */ pool_reclaim(pp); splx(s); } #if defined(POOL_DIAGNOSTIC) || defined(DEBUG) /* * Diagnostic helpers. */ void pool_print(pp, label) struct pool *pp; char *label; { if (label != NULL) printf("%s: ", label); 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); } int pool_chk(pp, label) struct pool *pp; char *label; { struct pool_item_header *ph; int r = 0; simple_lock(&pp->pr_lock); for (ph = TAILQ_FIRST(&pp->pr_pagelist); ph != NULL; ph = TAILQ_NEXT(ph, ph_pagelist)) { 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_flags & 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; } 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_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); r++; goto out; } } out: simple_unlock(&pp->pr_lock); return (r); } #endif /* POOL_DIAGNOSTIC || DEBUG */