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NetBSD/sys/kern/subr_pool.c

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/* $NetBSD: subr_pool.c,v 1.188 2011/01/17 07:36:58 uebayasi Exp $ */
/*-
* Copyright (c) 1997, 1999, 2000, 2002, 2007, 2008, 2010
* 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, and by Andrew Doran.
*
* 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.
*
* 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: subr_pool.c,v 1.188 2011/01/17 07:36:58 uebayasi Exp $");
#include "opt_ddb.h"
#include "opt_pool.h"
#include "opt_poollog.h"
#include "opt_lockdebug.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bitops.h>
#include <sys/proc.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/pool.h>
#include <sys/syslog.h>
#include <sys/debug.h>
#include <sys/lockdebug.h>
#include <sys/xcall.h>
#include <sys/cpu.h>
#include <sys/atomic.h>
#include <uvm/uvm_extern.h>
#ifdef DIAGNOSTIC
#include <uvm/uvm_km.h> /* uvm_km_va_drain */
#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 */
static TAILQ_HEAD(, pool) pool_head = TAILQ_HEAD_INITIALIZER(pool_head);
/* Private pool for page header structures */
#define PHPOOL_MAX 8
static struct pool phpool[PHPOOL_MAX];
#define PHPOOL_FREELIST_NELEM(idx) \
(((idx) == 0) ? 0 : BITMAP_SIZE * (1 << (idx)))
#ifdef POOL_SUBPAGE
/* Pool of subpages for use by normal pools. */
static struct pool psppool;
#endif
static SLIST_HEAD(, pool_allocator) pa_deferinitq =
SLIST_HEAD_INITIALIZER(pa_deferinitq);
static void *pool_page_alloc_meta(struct pool *, int);
static void pool_page_free_meta(struct pool *, void *);
/* allocator for pool metadata */
struct pool_allocator pool_allocator_meta = {
pool_page_alloc_meta, pool_page_free_meta,
.pa_backingmapptr = &kmem_map,
};
/* # of seconds to retain page after last use */
int pool_inactive_time = 10;
/* Next candidate for drainage (see pool_drain()) */
static struct pool *drainpp;
/* This lock protects both pool_head and drainpp. */
static kmutex_t pool_head_lock;
static kcondvar_t pool_busy;
/* This lock protects initialization of a potentially shared pool allocator */
static kmutex_t pool_allocator_lock;
typedef uint32_t pool_item_bitmap_t;
#define BITMAP_SIZE (CHAR_BIT * sizeof(pool_item_bitmap_t))
#define BITMAP_MASK (BITMAP_SIZE - 1)
struct pool_item_header {
/* Page headers */
LIST_ENTRY(pool_item_header)
ph_pagelist; /* pool page list */
SPLAY_ENTRY(pool_item_header)
ph_node; /* Off-page page headers */
void * ph_page; /* this page's address */
uint32_t ph_time; /* last referenced */
uint16_t ph_nmissing; /* # of chunks in use */
uint16_t ph_off; /* start offset in page */
union {
/* !PR_NOTOUCH */
struct {
LIST_HEAD(, pool_item)
phu_itemlist; /* chunk list for this page */
} phu_normal;
/* PR_NOTOUCH */
struct {
pool_item_bitmap_t phu_bitmap[1];
} phu_notouch;
} ph_u;
};
#define ph_itemlist ph_u.phu_normal.phu_itemlist
#define ph_bitmap ph_u.phu_notouch.phu_bitmap
struct pool_item {
#ifdef DIAGNOSTIC
u_int pi_magic;
#endif
#define PI_MAGIC 0xdeaddeadU
/* Other entries use only this list entry */
LIST_ENTRY(pool_item) pi_list;
};
#define POOL_NEEDS_CATCHUP(pp) \
((pp)->pr_nitems < (pp)->pr_minitems)
/*
* 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 PCG_NUMOBJECTS 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.
*
* 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.
*/
static struct pool pcg_normal_pool;
static struct pool pcg_large_pool;
static struct pool cache_pool;
static struct pool cache_cpu_pool;
/* List of all caches. */
TAILQ_HEAD(,pool_cache) pool_cache_head =
TAILQ_HEAD_INITIALIZER(pool_cache_head);
int pool_cache_disable; /* global disable for caching */
static const pcg_t pcg_dummy; /* zero sized: always empty, yet always full */
static bool pool_cache_put_slow(pool_cache_cpu_t *, int,
void *);
static bool pool_cache_get_slow(pool_cache_cpu_t *, int,
void **, paddr_t *, int);
static void pool_cache_cpu_init1(struct cpu_info *, pool_cache_t);
static void pool_cache_invalidate_groups(pool_cache_t, pcg_t *);
static void pool_cache_invalidate_cpu(pool_cache_t, u_int);
static void pool_cache_xcall(pool_cache_t);
static int pool_catchup(struct pool *);
static void pool_prime_page(struct pool *, void *,
struct pool_item_header *);
static void pool_update_curpage(struct pool *);
static int pool_grow(struct pool *, int);
static void *pool_allocator_alloc(struct pool *, int);
static void pool_allocator_free(struct pool *, void *);
static void pool_print_pagelist(struct pool *, struct pool_pagelist *,
void (*)(const char *, ...));
static void pool_print1(struct pool *, const char *,
void (*)(const char *, ...));
static int pool_chk_page(struct pool *, const char *,
struct pool_item_header *);
/*
* 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;
};
#ifdef POOL_DIAGNOSTIC
/* Number of entries in pool log buffers */
#ifndef POOL_LOGSIZE
#define POOL_LOGSIZE 10
#endif
int pool_logsize = POOL_LOGSIZE;
static inline void
pr_log(struct pool *pp, void *v, int action, const char *file, long line)
{
int n;
struct pool_log *pl;
if ((pp->pr_roflags & PR_LOGGING) == 0)
return;
if (pp->pr_log == NULL) {
if (kmem_map != NULL)
pp->pr_log = malloc(
pool_logsize * sizeof(struct pool_log),
M_TEMP, M_NOWAIT | M_ZERO);
if (pp->pr_log == NULL)
return;
pp->pr_curlogentry = 0;
pp->pr_logsize = pool_logsize;
}
/*
* Fill in the current entry. Wrap around and overwrite
* the oldest entry if necessary.
*/
n = pp->pr_curlogentry;
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,
void (*pr)(const char *, ...))
{
int i = pp->pr_logsize;
int n = pp->pr_curlogentry;
if (pp->pr_log == NULL)
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, 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, pi, pr)
#define pr_enter(pp, file, line)
#define pr_leave(pp)
#define pr_enter_check(pp, pr)
#endif /* POOL_DIAGNOSTIC */
static inline unsigned int
pr_item_notouch_index(const struct pool *pp, const struct pool_item_header *ph,
const void *v)
{
const char *cp = v;
unsigned int idx;
KASSERT(pp->pr_roflags & PR_NOTOUCH);
idx = (cp - (char *)ph->ph_page - ph->ph_off) / pp->pr_size;
KASSERT(idx < pp->pr_itemsperpage);
return idx;
}
static inline void
pr_item_notouch_put(const struct pool *pp, struct pool_item_header *ph,
void *obj)
{
unsigned int idx = pr_item_notouch_index(pp, ph, obj);
pool_item_bitmap_t *bitmap = ph->ph_bitmap + (idx / BITMAP_SIZE);
pool_item_bitmap_t mask = 1 << (idx & BITMAP_MASK);
KASSERT((*bitmap & mask) == 0);
*bitmap |= mask;
}
static inline void *
pr_item_notouch_get(const struct pool *pp, struct pool_item_header *ph)
{
pool_item_bitmap_t *bitmap = ph->ph_bitmap;
unsigned int idx;
int i;
for (i = 0; ; i++) {
int bit;
KASSERT((i * BITMAP_SIZE) < pp->pr_itemsperpage);
bit = ffs32(bitmap[i]);
if (bit) {
pool_item_bitmap_t mask;
bit--;
idx = (i * BITMAP_SIZE) + bit;
mask = 1 << bit;
KASSERT((bitmap[i] & mask) != 0);
bitmap[i] &= ~mask;
break;
}
}
KASSERT(idx < pp->pr_itemsperpage);
return (char *)ph->ph_page + ph->ph_off + idx * pp->pr_size;
}
static inline void
pr_item_notouch_init(const struct pool *pp, struct pool_item_header *ph)
{
pool_item_bitmap_t *bitmap = ph->ph_bitmap;
const int n = howmany(pp->pr_itemsperpage, BITMAP_SIZE);
int i;
for (i = 0; i < n; i++) {
bitmap[i] = (pool_item_bitmap_t)-1;
}
}
static inline int
phtree_compare(struct pool_item_header *a, struct pool_item_header *b)
{
/*
* we consider pool_item_header with smaller ph_page bigger.
* (this unnatural ordering is for the benefit of pr_find_pagehead.)
*/
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);
static inline struct pool_item_header *
pr_find_pagehead_noalign(struct pool *pp, void *v)
{
struct pool_item_header *ph, tmp;
tmp.ph_page = (void *)(uintptr_t)v;
ph = SPLAY_FIND(phtree, &pp->pr_phtree, &tmp);
if (ph == NULL) {
ph = SPLAY_ROOT(&pp->pr_phtree);
if (ph != NULL && phtree_compare(&tmp, ph) >= 0) {
ph = SPLAY_NEXT(phtree, &pp->pr_phtree, ph);
}
KASSERT(ph == NULL || phtree_compare(&tmp, ph) < 0);
}
return ph;
}
/*
* Return the pool page header based on item address.
*/
static inline struct pool_item_header *
pr_find_pagehead(struct pool *pp, void *v)
{
struct pool_item_header *ph, tmp;
if ((pp->pr_roflags & PR_NOALIGN) != 0) {
ph = pr_find_pagehead_noalign(pp, v);
} else {
void *page =
(void *)((uintptr_t)v & pp->pr_alloc->pa_pagemask);
if ((pp->pr_roflags & PR_PHINPAGE) != 0) {
ph = (struct pool_item_header *)((char *)page + pp->pr_phoffset);
} else {
tmp.ph_page = page;
ph = SPLAY_FIND(phtree, &pp->pr_phtree, &tmp);
}
}
KASSERT(ph == NULL || ((pp->pr_roflags & PR_PHINPAGE) != 0) ||
((char *)ph->ph_page <= (char *)v &&
(char *)v < (char *)ph->ph_page + pp->pr_alloc->pa_pagesz));
return ph;
}
static void
pr_pagelist_free(struct pool *pp, struct pool_pagelist *pq)
{
struct pool_item_header *ph;
while ((ph = LIST_FIRST(pq)) != NULL) {
LIST_REMOVE(ph, ph_pagelist);
pool_allocator_free(pp, ph->ph_page);
if ((pp->pr_roflags & PR_PHINPAGE) == 0)
pool_put(pp->pr_phpool, ph);
}
}
/*
* Remove a page from the pool.
*/
static inline void
pr_rmpage(struct pool *pp, struct pool_item_header *ph,
struct pool_pagelist *pq)
{
KASSERT(mutex_owned(&pp->pr_lock));
/*
* 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 the page from the pool and queue it for release.
*/
LIST_REMOVE(ph, ph_pagelist);
if ((pp->pr_roflags & PR_PHINPAGE) == 0)
SPLAY_REMOVE(phtree, &pp->pr_phtree, ph);
LIST_INSERT_HEAD(pq, ph, ph_pagelist);
pp->pr_npages--;
pp->pr_npagefree++;
pool_update_curpage(pp);
}
static bool
pa_starved_p(struct pool_allocator *pa)
{
if (pa->pa_backingmap != NULL) {
return vm_map_starved_p(pa->pa_backingmap);
}
return false;
}
static int
pool_reclaim_callback(struct callback_entry *ce, void *obj, void *arg)
{
struct pool *pp = obj;
struct pool_allocator *pa = pp->pr_alloc;
KASSERT(&pp->pr_reclaimerentry == ce);
pool_reclaim(pp);
if (!pa_starved_p(pa)) {
return CALLBACK_CHAIN_ABORT;
}
return CALLBACK_CHAIN_CONTINUE;
}
static void
pool_reclaim_register(struct pool *pp)
{
struct vm_map *map = pp->pr_alloc->pa_backingmap;
int s;
if (map == NULL) {
return;
}
s = splvm(); /* not necessary for INTRSAFE maps, but don't care. */
callback_register(&vm_map_to_kernel(map)->vmk_reclaim_callback,
&pp->pr_reclaimerentry, pp, pool_reclaim_callback);
splx(s);
#ifdef DIAGNOSTIC
/* Diagnostic drain attempt. */
uvm_km_va_drain(map, 0);
#endif
}
static void
pool_reclaim_unregister(struct pool *pp)
{
struct vm_map *map = pp->pr_alloc->pa_backingmap;
int s;
if (map == NULL) {
return;
}
s = splvm(); /* not necessary for INTRSAFE maps, but don't care. */
callback_unregister(&vm_map_to_kernel(map)->vmk_reclaim_callback,
&pp->pr_reclaimerentry);
splx(s);
}
static void
pa_reclaim_register(struct pool_allocator *pa)
{
struct vm_map *map = *pa->pa_backingmapptr;
struct pool *pp;
KASSERT(pa->pa_backingmap == NULL);
if (map == NULL) {
SLIST_INSERT_HEAD(&pa_deferinitq, pa, pa_q);
return;
}
pa->pa_backingmap = map;
TAILQ_FOREACH(pp, &pa->pa_list, pr_alloc_list) {
pool_reclaim_register(pp);
}
}
/*
* Initialize all the pools listed in the "pools" link set.
*/
void
pool_subsystem_init(void)
{
struct pool_allocator *pa;
mutex_init(&pool_head_lock, MUTEX_DEFAULT, IPL_NONE);
mutex_init(&pool_allocator_lock, MUTEX_DEFAULT, IPL_NONE);
cv_init(&pool_busy, "poolbusy");
while ((pa = SLIST_FIRST(&pa_deferinitq)) != NULL) {
KASSERT(pa->pa_backingmapptr != NULL);
KASSERT(*pa->pa_backingmapptr != NULL);
SLIST_REMOVE_HEAD(&pa_deferinitq, pa_q);
pa_reclaim_register(pa);
}
pool_init(&cache_pool, sizeof(struct pool_cache), coherency_unit,
0, 0, "pcache", &pool_allocator_nointr, IPL_NONE);
pool_init(&cache_cpu_pool, sizeof(pool_cache_cpu_t), coherency_unit,
0, 0, "pcachecpu", &pool_allocator_nointr, IPL_NONE);
}
/*
* 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 ipl)
{
struct pool *pp1;
size_t trysize, phsize;
int off, slack;
#ifdef DEBUG
/*
* Check that the pool hasn't already been initialised and
* added to the list of all pools.
*/
TAILQ_FOREACH(pp1, &pool_head, pr_poollist) {
if (pp == pp1)
panic("pool_init: pool %s already initialised",
wchan);
}
#endif
#ifdef POOL_DIAGNOSTIC
/*
* Always log if POOL_DIAGNOSTIC is defined.
*/
if (pool_logsize != 0)
flags |= PR_LOGGING;
#endif
if (palloc == NULL)
palloc = &pool_allocator_kmem;
#ifdef POOL_SUBPAGE
if (size > palloc->pa_pagesz) {
if (palloc == &pool_allocator_kmem)
palloc = &pool_allocator_kmem_fullpage;
else if (palloc == &pool_allocator_nointr)
palloc = &pool_allocator_nointr_fullpage;
}
#endif /* POOL_SUBPAGE */
if (!cold)
mutex_enter(&pool_allocator_lock);
if (palloc->pa_refcnt++ == 0) {
if (palloc->pa_pagesz == 0)
palloc->pa_pagesz = PAGE_SIZE;
TAILQ_INIT(&palloc->pa_list);
mutex_init(&palloc->pa_lock, MUTEX_DEFAULT, IPL_VM);
palloc->pa_pagemask = ~(palloc->pa_pagesz - 1);
palloc->pa_pageshift = ffs(palloc->pa_pagesz) - 1;
if (palloc->pa_backingmapptr != NULL) {
pa_reclaim_register(palloc);
}
}
if (!cold)
mutex_exit(&pool_allocator_lock);
if (align == 0)
align = ALIGN(1);
if ((flags & PR_NOTOUCH) == 0 && 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 (%zu) too large", size);
#endif
/*
* Initialize the pool structure.
*/
LIST_INIT(&pp->pr_emptypages);
LIST_INIT(&pp->pr_fullpages);
LIST_INIT(&pp->pr_partpages);
pp->pr_cache = NULL;
pp->pr_curpage = NULL;
pp->pr_npages = 0;
pp->pr_minitems = 0;
pp->pr_minpages = 0;
pp->pr_maxpages = UINT_MAX;
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_drain_hook = NULL;
pp->pr_drain_hook_arg = NULL;
pp->pr_freecheck = NULL;
/*
* Decide whether to put the page header off page to avoid
* wasting too large a part of the page or too big item.
* 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 and about 8 times of the item
* size as the threshold (XXX: tune)
*
* However, we'll put the header into the page if we can put
* it without wasting any items.
*
* Silently enforce `0 <= ioff < align'.
*/
pp->pr_itemoffset = ioff %= align;
/* See the comment below about reserved bytes. */
trysize = palloc->pa_pagesz - ((align - ioff) % align);
phsize = ALIGN(sizeof(struct pool_item_header));
if ((pp->pr_roflags & (PR_NOTOUCH | PR_NOALIGN)) == 0 &&
(pp->pr_size < MIN(palloc->pa_pagesz / 16, phsize << 3) ||
trysize / pp->pr_size == (trysize - phsize) / pp->pr_size)) {
/* Use the end of the page for the page header */
pp->pr_roflags |= PR_PHINPAGE;
pp->pr_phoffset = off = palloc->pa_pagesz - phsize;
} 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.
*/
pp->pr_itemsperpage = (off - ((align - ioff) % align)) / pp->pr_size;
KASSERT(pp->pr_itemsperpage != 0);
if ((pp->pr_roflags & PR_NOTOUCH)) {
int idx;
for (idx = 0; pp->pr_itemsperpage > PHPOOL_FREELIST_NELEM(idx);
idx++) {
/* nothing */
}
if (idx >= PHPOOL_MAX) {
/*
* if you see this panic, consider to tweak
* PHPOOL_MAX and PHPOOL_FREELIST_NELEM.
*/
panic("%s: too large itemsperpage(%d) for PR_NOTOUCH",
pp->pr_wchan, pp->pr_itemsperpage);
}
pp->pr_phpool = &phpool[idx];
} else if ((pp->pr_roflags & PR_PHINPAGE) == 0) {
pp->pr_phpool = &phpool[0];
}
#if defined(DIAGNOSTIC)
else {
pp->pr_phpool = NULL;
}
#endif
/*
* 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;
pp->pr_refcnt = 0;
pp->pr_log = NULL;
pp->pr_entered_file = NULL;
pp->pr_entered_line = 0;
mutex_init(&pp->pr_lock, MUTEX_DEFAULT, ipl);
cv_init(&pp->pr_cv, wchan);
pp->pr_ipl = ipl;
/*
* Initialize private page header pool and cache magazine pool if we
* haven't done so yet.
* XXX LOCKING.
*/
if (phpool[0].pr_size == 0) {
int idx;
for (idx = 0; idx < PHPOOL_MAX; idx++) {
static char phpool_names[PHPOOL_MAX][6+1+6+1];
int nelem;
size_t sz;
nelem = PHPOOL_FREELIST_NELEM(idx);
snprintf(phpool_names[idx], sizeof(phpool_names[idx]),
"phpool-%d", nelem);
sz = sizeof(struct pool_item_header);
if (nelem) {
sz = offsetof(struct pool_item_header,
ph_bitmap[howmany(nelem, BITMAP_SIZE)]);
}
pool_init(&phpool[idx], sz, 0, 0, 0,
phpool_names[idx], &pool_allocator_meta, IPL_VM);
}
#ifdef POOL_SUBPAGE
pool_init(&psppool, POOL_SUBPAGE, POOL_SUBPAGE, 0,
PR_RECURSIVE, "psppool", &pool_allocator_meta, IPL_VM);
#endif
size = sizeof(pcg_t) +
(PCG_NOBJECTS_NORMAL - 1) * sizeof(pcgpair_t);
pool_init(&pcg_normal_pool, size, coherency_unit, 0, 0,
"pcgnormal", &pool_allocator_meta, IPL_VM);
size = sizeof(pcg_t) +
(PCG_NOBJECTS_LARGE - 1) * sizeof(pcgpair_t);
pool_init(&pcg_large_pool, size, coherency_unit, 0, 0,
"pcglarge", &pool_allocator_meta, IPL_VM);
}
/* Insert into the list of all pools. */
if (!cold)
mutex_enter(&pool_head_lock);
TAILQ_FOREACH(pp1, &pool_head, pr_poollist) {
if (strcmp(pp1->pr_wchan, pp->pr_wchan) > 0)
break;
}
if (pp1 == NULL)
TAILQ_INSERT_TAIL(&pool_head, pp, pr_poollist);
else
TAILQ_INSERT_BEFORE(pp1, pp, pr_poollist);
if (!cold)
mutex_exit(&pool_head_lock);
/* Insert this into the list of pools using this allocator. */
if (!cold)
mutex_enter(&palloc->pa_lock);
TAILQ_INSERT_TAIL(&palloc->pa_list, pp, pr_alloc_list);
if (!cold)
mutex_exit(&palloc->pa_lock);
pool_reclaim_register(pp);
}
/*
* De-commision a pool resource.
*/
void
pool_destroy(struct pool *pp)
{
struct pool_pagelist pq;
struct pool_item_header *ph;
/* Remove from global pool list */
mutex_enter(&pool_head_lock);
while (pp->pr_refcnt != 0)
cv_wait(&pool_busy, &pool_head_lock);
TAILQ_REMOVE(&pool_head, pp, pr_poollist);
if (drainpp == pp)
drainpp = NULL;
mutex_exit(&pool_head_lock);
/* Remove this pool from its allocator's list of pools. */
pool_reclaim_unregister(pp);
mutex_enter(&pp->pr_alloc->pa_lock);
TAILQ_REMOVE(&pp->pr_alloc->pa_list, pp, pr_alloc_list);
mutex_exit(&pp->pr_alloc->pa_lock);
mutex_enter(&pool_allocator_lock);
if (--pp->pr_alloc->pa_refcnt == 0)
mutex_destroy(&pp->pr_alloc->pa_lock);
mutex_exit(&pool_allocator_lock);
mutex_enter(&pp->pr_lock);
KASSERT(pp->pr_cache == NULL);
#ifdef DIAGNOSTIC
if (pp->pr_nout != 0) {
pr_printlog(pp, NULL, printf);
panic("pool_destroy: pool busy: still out: %u",
pp->pr_nout);
}
#endif
KASSERT(LIST_EMPTY(&pp->pr_fullpages));
KASSERT(LIST_EMPTY(&pp->pr_partpages));
/* Remove all pages */
LIST_INIT(&pq);
while ((ph = LIST_FIRST(&pp->pr_emptypages)) != NULL)
pr_rmpage(pp, ph, &pq);
mutex_exit(&pp->pr_lock);
pr_pagelist_free(pp, &pq);
#ifdef POOL_DIAGNOSTIC
if (pp->pr_log != NULL) {
free(pp->pr_log, M_TEMP);
pp->pr_log = NULL;
}
#endif
cv_destroy(&pp->pr_cv);
mutex_destroy(&pp->pr_lock);
}
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, void *storage, int flags)
{
struct pool_item_header *ph;
if ((pp->pr_roflags & PR_PHINPAGE) != 0)
ph = (struct pool_item_header *) ((char *)storage + pp->pr_phoffset);
else
ph = pool_get(pp->pr_phpool, flags);
return (ph);
}
/*
* Grab an item from the pool.
*/
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 (pp->pr_itemsperpage == 0)
panic("pool_get: pool '%s': pr_itemsperpage is zero, "
"pool not initialized?", pp->pr_wchan);
if ((cpu_intr_p() || cpu_softintr_p()) && pp->pr_ipl == IPL_NONE &&
!cold && panicstr == NULL)
panic("pool '%s' is IPL_NONE, but called from "
"interrupt context\n", pp->pr_wchan);
#endif
if (flags & PR_WAITOK) {
ASSERT_SLEEPABLE();
}
mutex_enter(&pp->pr_lock);
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);
mutex_exit(&pp->pr_lock);
panic("pool_get: %s: crossed hard limit", pp->pr_wchan);
}
#endif
if (__predict_false(pp->pr_nout == pp->pr_hardlimit)) {
if (pp->pr_drain_hook != NULL) {
/*
* 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.
*/
pr_leave(pp);
mutex_exit(&pp->pr_lock);
(*pp->pr_drain_hook)(pp->pr_drain_hook_arg, flags);
mutex_enter(&pp->pr_lock);
pr_enter(pp, file, line);
if (pp->pr_nout < pp->pr_hardlimit)
goto startover;
}
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);
cv_wait(&pp->pr_cv, &pp->pr_lock);
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);
mutex_exit(&pp->pr_lock);
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) {
int error;
#ifdef DIAGNOSTIC
if (pp->pr_nitems != 0) {
mutex_exit(&pp->pr_lock);
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);
error = pool_grow(pp, flags);
pr_enter(pp, file, line);
if (error != 0) {
/*
* 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;
pp->pr_nfail++;
pr_leave(pp);
mutex_exit(&pp->pr_lock);
return (NULL);
}
/* Start the allocation process over. */
goto startover;
}
if (pp->pr_roflags & PR_NOTOUCH) {
#ifdef DIAGNOSTIC
if (__predict_false(ph->ph_nmissing == pp->pr_itemsperpage)) {
pr_leave(pp);
mutex_exit(&pp->pr_lock);
panic("pool_get: %s: page empty", pp->pr_wchan);
}
#endif
v = pr_item_notouch_get(pp, ph);
#ifdef POOL_DIAGNOSTIC
pr_log(pp, v, PRLOG_GET, file, line);
#endif
} else {
v = pi = LIST_FIRST(&ph->ph_itemlist);
if (__predict_false(v == NULL)) {
pr_leave(pp);
mutex_exit(&pp->pr_lock);
panic("pool_get: %s: page empty", pp->pr_wchan);
}
#ifdef DIAGNOSTIC
if (__predict_false(pp->pr_nitems == 0)) {
pr_leave(pp);
mutex_exit(&pp->pr_lock);
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\n",
pp->pr_wchan, pi->pi_magic, ph->ph_page, pi);
}
#endif
/*
* Remove from item list.
*/
LIST_REMOVE(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 (ph->ph_nmissing == pp->pr_itemsperpage) {
#ifdef DIAGNOSTIC
if (__predict_false((pp->pr_roflags & PR_NOTOUCH) == 0 &&
!LIST_EMPTY(&ph->ph_itemlist))) {
pr_leave(pp);
mutex_exit(&pp->pr_lock);
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++;
pr_leave(pp);
/*
* 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.
*/
}
mutex_exit(&pp->pr_lock);
KASSERT((((vaddr_t)v + pp->pr_itemoffset) & (pp->pr_align - 1)) == 0);
FREECHECK_OUT(&pp->pr_freecheck, v);
return (v);
}
/*
* Internal version of pool_put(). Pool is already locked/entered.
*/
static void
pool_do_put(struct pool *pp, void *v, struct pool_pagelist *pq)
{
struct pool_item *pi = v;
struct pool_item_header *ph;
KASSERT(mutex_owned(&pp->pr_lock));
FREECHECK_IN(&pp->pr_freecheck, v);
LOCKDEBUG_MEM_CHECK(v, pp->pr_size);
#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, v)) == NULL)) {
pr_printlog(pp, NULL, printf);
panic("pool_put: %s: page header missing", pp->pr_wchan);
}
/*
* Return to item list.
*/
if (pp->pr_roflags & PR_NOTOUCH) {
pr_item_notouch_put(pp, ph, v);
} else {
#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
LIST_INSERT_HEAD(&ph->ph_itemlist, pi, pi_list);
}
KDASSERT(ph->ph_nmissing != 0);
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;
cv_broadcast(&pp->pr_cv);
}
/*
* 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. ONLY CONSIDER
* FREEING BACK A PAGE IF WE HAVE MORE THAN OUR MINIMUM PAGE
* CLAIM.
*
* (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_npages > pp->pr_minpages &&
pp->pr_npages > pp->pr_maxpages) {
pr_rmpage(pp, ph, pq);
} 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.
*
* note for 64-bit time_t: truncating to 32-bit is not
* a problem for our usage.
*/
ph->ph_time = time_uptime;
}
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.
*/
#ifdef POOL_DIAGNOSTIC
void
_pool_put(struct pool *pp, void *v, const char *file, long line)
{
struct pool_pagelist pq;
LIST_INIT(&pq);
mutex_enter(&pp->pr_lock);
pr_enter(pp, file, line);
pr_log(pp, v, PRLOG_PUT, file, line);
pool_do_put(pp, v, &pq);
pr_leave(pp);
mutex_exit(&pp->pr_lock);
pr_pagelist_free(pp, &pq);
}
#undef pool_put
#endif /* POOL_DIAGNOSTIC */
void
pool_put(struct pool *pp, void *v)
{
struct pool_pagelist pq;
LIST_INIT(&pq);
mutex_enter(&pp->pr_lock);
pool_do_put(pp, v, &pq);
mutex_exit(&pp->pr_lock);
pr_pagelist_free(pp, &pq);
}
#ifdef POOL_DIAGNOSTIC
#define pool_put(h, v) _pool_put((h), (v), __FILE__, __LINE__)
#endif
/*
* pool_grow: grow a pool by a page.
*
* => called with pool locked.
* => unlock and relock the pool.
* => return with pool locked.
*/
static int
pool_grow(struct pool *pp, int flags)
{
struct pool_item_header *ph = NULL;
char *cp;
mutex_exit(&pp->pr_lock);
cp = pool_allocator_alloc(pp, flags);
if (__predict_true(cp != NULL)) {
ph = pool_alloc_item_header(pp, cp, flags);
}
if (__predict_false(cp == NULL || ph == NULL)) {
if (cp != NULL) {
pool_allocator_free(pp, cp);
}
mutex_enter(&pp->pr_lock);
return ENOMEM;
}
mutex_enter(&pp->pr_lock);
pool_prime_page(pp, cp, ph);
pp->pr_npagealloc++;
return 0;
}
/*
* Add N items to the pool.
*/
int
pool_prime(struct pool *pp, int n)
{
int newpages;
int error = 0;
mutex_enter(&pp->pr_lock);
newpages = roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage;
while (newpages-- > 0) {
error = pool_grow(pp, PR_NOWAIT);
if (error) {
break;
}
pp->pr_minpages++;
}
if (pp->pr_minpages >= pp->pr_maxpages)
pp->pr_maxpages = pp->pr_minpages + 1; /* XXX */
mutex_exit(&pp->pr_lock);
return error;
}
/*
* Add a page worth of items to the pool.
*
* Note, we must be called with the pool descriptor LOCKED.
*/
static void
pool_prime_page(struct pool *pp, void *storage, struct pool_item_header *ph)
{
struct pool_item *pi;
void *cp = storage;
const unsigned int align = pp->pr_align;
const unsigned int ioff = pp->pr_itemoffset;
int n;
KASSERT(mutex_owned(&pp->pr_lock));
#ifdef DIAGNOSTIC
if ((pp->pr_roflags & PR_NOALIGN) == 0 &&
((uintptr_t)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);
LIST_INIT(&ph->ph_itemlist);
ph->ph_page = storage;
ph->ph_nmissing = 0;
ph->ph_time = time_uptime;
if ((pp->pr_roflags & PR_PHINPAGE) == 0)
SPLAY_INSERT(phtree, &pp->pr_phtree, ph);
pp->pr_nidle++;
/*
* Color this page.
*/
ph->ph_off = pp->pr_curcolor;
cp = (char *)cp + ph->ph_off;
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 = (char *)cp + align - ioff;
KASSERT((((vaddr_t)cp + ioff) & (align - 1)) == 0);
/*
* Insert remaining chunks on the bucket list.
*/
n = pp->pr_itemsperpage;
pp->pr_nitems += n;
if (pp->pr_roflags & PR_NOTOUCH) {
pr_item_notouch_init(pp, ph);
} else {
while (n--) {
pi = (struct pool_item *)cp;
KASSERT(((((vaddr_t)pi) + ioff) & (align - 1)) == 0);
/* Insert on page list */
LIST_INSERT_HEAD(&ph->ph_itemlist, pi, pi_list);
#ifdef DIAGNOSTIC
pi->pi_magic = PI_MAGIC;
#endif
cp = (char *)cp + pp->pr_size;
KASSERT((((vaddr_t)cp + ioff) & (align - 1)) == 0);
}
}
/*
* 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.
*/
static int
pool_catchup(struct pool *pp)
{
int error = 0;
while (POOL_NEEDS_CATCHUP(pp)) {
error = pool_grow(pp, PR_NOWAIT);
if (error) {
break;
}
}
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);
}
KASSERT((pp->pr_curpage == NULL && pp->pr_nitems == 0) ||
(pp->pr_curpage != NULL && pp->pr_nitems > 0));
}
void
pool_setlowat(struct pool *pp, int n)
{
mutex_enter(&pp->pr_lock);
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.
*/
}
mutex_exit(&pp->pr_lock);
}
void
pool_sethiwat(struct pool *pp, int n)
{
mutex_enter(&pp->pr_lock);
pp->pr_maxpages = (n == 0)
? 0
: roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage;
mutex_exit(&pp->pr_lock);
}
void
pool_sethardlimit(struct pool *pp, int n, const char *warnmess, int ratecap)
{
mutex_enter(&pp->pr_lock);
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)
? 0
: roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage;
mutex_exit(&pp->pr_lock);
}
/*
* Release all complete pages that have not been used recently.
*
* Might be called from interrupt context.
*/
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_pagelist pq;
uint32_t curtime;
bool klock;
int rv;
if (cpu_intr_p() || cpu_softintr_p()) {
KASSERT(pp->pr_ipl != IPL_NONE);
}
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);
}
/*
* XXXSMP Because we do not want to cause non-MPSAFE code
* to block.
*/
if (pp->pr_ipl == IPL_SOFTNET || pp->pr_ipl == IPL_SOFTCLOCK ||
pp->pr_ipl == IPL_SOFTSERIAL) {
KERNEL_LOCK(1, NULL);
klock = true;
} else
klock = false;
/* Reclaim items from the pool's cache (if any). */
if (pp->pr_cache != NULL)
pool_cache_invalidate(pp->pr_cache);
if (mutex_tryenter(&pp->pr_lock) == 0) {
if (klock) {
KERNEL_UNLOCK_ONE(NULL);
}
return (0);
}
pr_enter(pp, file, line);
LIST_INIT(&pq);
curtime = time_uptime;
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);
if (curtime - ph->ph_time < pool_inactive_time
&& !pa_starved_p(pp->pr_alloc))
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);
mutex_exit(&pp->pr_lock);
if (LIST_EMPTY(&pq))
rv = 0;
else {
pr_pagelist_free(pp, &pq);
rv = 1;
}
if (klock) {
KERNEL_UNLOCK_ONE(NULL);
}
return (rv);
}
/*
* Drain pools, one at a time. This is a two stage process;
* drain_start kicks off a cross call to drain CPU-level caches
* if the pool has an associated pool_cache. drain_end waits
* for those cross calls to finish, and then drains the cache
* (if any) and pool.
*
* Note, must never be called from interrupt context.
*/
void
pool_drain_start(struct pool **ppp, uint64_t *wp)
{
struct pool *pp;
KASSERT(!TAILQ_EMPTY(&pool_head));
pp = NULL;
/* Find next pool to drain, and add a reference. */
mutex_enter(&pool_head_lock);
do {
if (drainpp == NULL) {
drainpp = TAILQ_FIRST(&pool_head);
}
if (drainpp != NULL) {
pp = drainpp;
drainpp = TAILQ_NEXT(pp, pr_poollist);
}
/*
* Skip completely idle pools. We depend on at least
* one pool in the system being active.
*/
} while (pp == NULL || pp->pr_npages == 0);
pp->pr_refcnt++;
mutex_exit(&pool_head_lock);
/* If there is a pool_cache, drain CPU level caches. */
*ppp = pp;
if (pp->pr_cache != NULL) {
*wp = xc_broadcast(0, (xcfunc_t)pool_cache_xcall,
pp->pr_cache, NULL);
}
}
bool
pool_drain_end(struct pool *pp, uint64_t where)
{
bool reclaimed;
if (pp == NULL)
return false;
KASSERT(pp->pr_refcnt > 0);
/* Wait for remote draining to complete. */
if (pp->pr_cache != NULL)
xc_wait(where);
/* Drain the cache (if any) and pool.. */
reclaimed = pool_reclaim(pp);
/* Finally, unlock the pool. */
mutex_enter(&pool_head_lock);
pp->pr_refcnt--;
cv_broadcast(&pool_busy);
mutex_exit(&pool_head_lock);
return reclaimed;
}
/*
* Diagnostic helpers.
*/
void
pool_print(struct pool *pp, const char *modif)
{
pool_print1(pp, modif, printf);
}
void
pool_printall(const char *modif, void (*pr)(const char *, ...))
{
struct pool *pp;
TAILQ_FOREACH(pp, &pool_head, pr_poollist) {
pool_printit(pp, modif, pr);
}
}
void
pool_printit(struct pool *pp, const char *modif, void (*pr)(const char *, ...))
{
if (pp == NULL) {
(*pr)("Must specify a pool to print.\n");
return;
}
pool_print1(pp, modif, pr);
}
static void
pool_print_pagelist(struct pool *pp, struct pool_pagelist *pl,
void (*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 %" PRIu32 "\n",
ph->ph_page, ph->ph_nmissing, ph->ph_time);
#ifdef DIAGNOSTIC
if (!(pp->pr_roflags & PR_NOTOUCH)) {
LIST_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
}
}
static void
pool_print1(struct pool *pp, const char *modif, void (*pr)(const char *, ...))
{
struct pool_item_header *ph;
pool_cache_t pc;
pcg_t *pcg;
pool_cache_cpu_t *cc;
uint64_t cpuhit, cpumiss;
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;
}
if ((pc = pp->pr_cache) != NULL) {
(*pr)("POOL CACHE");
} else {
(*pr)("POOL");
}
(*pr)(" %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)("\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, &pp->pr_emptypages, pr);
if ((ph = LIST_FIRST(&pp->pr_fullpages)) != NULL)
(*pr)("\n\tfull page list:\n");
pool_print_pagelist(pp, &pp->pr_fullpages, pr);
if ((ph = LIST_FIRST(&pp->pr_partpages)) != NULL)
(*pr)("\n\tpartial-page list:\n");
pool_print_pagelist(pp, &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:
#define PR_GROUPLIST(pcg) \
(*pr)("\t\tgroup %p: avail %d\n", pcg, pcg->pcg_avail); \
for (i = 0; i < pcg->pcg_size; 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); \
} \
}
if (pc != NULL) {
cpuhit = 0;
cpumiss = 0;
for (i = 0; i < __arraycount(pc->pc_cpus); i++) {
if ((cc = pc->pc_cpus[i]) == NULL)
continue;
cpuhit += cc->cc_hits;
cpumiss += cc->cc_misses;
}
(*pr)("\tcpu layer hits %llu misses %llu\n", cpuhit, cpumiss);
(*pr)("\tcache layer hits %llu misses %llu\n",
pc->pc_hits, pc->pc_misses);
(*pr)("\tcache layer entry uncontended %llu contended %llu\n",
pc->pc_hits + pc->pc_misses - pc->pc_contended,
pc->pc_contended);
(*pr)("\tcache layer empty groups %u full groups %u\n",
pc->pc_nempty, pc->pc_nfull);
if (print_cache) {
(*pr)("\tfull cache groups:\n");
for (pcg = pc->pc_fullgroups; pcg != NULL;
pcg = pcg->pcg_next) {
PR_GROUPLIST(pcg);
}
(*pr)("\tempty cache groups:\n");
for (pcg = pc->pc_emptygroups; pcg != NULL;
pcg = pcg->pcg_next) {
PR_GROUPLIST(pcg);
}
}
}
#undef PR_GROUPLIST
pr_enter_check(pp, pr);
}
static int
pool_chk_page(struct pool *pp, const char *label, struct pool_item_header *ph)
{
struct pool_item *pi;
void *page;
int n;
if ((pp->pr_roflags & PR_NOALIGN) == 0) {
page = (void *)((uintptr_t)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;
}
}
if ((pp->pr_roflags & PR_NOTOUCH) != 0)
return 0;
for (pi = LIST_FIRST(&ph->ph_itemlist), n = 0;
pi != NULL;
pi = LIST_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\n",
pp->pr_wchan, pi->pi_magic, ph->ph_page,
n, pi);
panic("pool");
}
#endif
if ((pp->pr_roflags & PR_NOALIGN) != 0) {
continue;
}
page = (void *)((uintptr_t)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;
mutex_enter(&pp->pr_lock);
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:
mutex_exit(&pp->pr_lock);
return (r);
}
/*
* pool_cache_init:
*
* Initialize a pool cache.
*/
pool_cache_t
pool_cache_init(size_t size, u_int align, u_int align_offset, u_int flags,
const char *wchan, struct pool_allocator *palloc, int ipl,
int (*ctor)(void *, void *, int), void (*dtor)(void *, void *), void *arg)
{
pool_cache_t pc;
pc = pool_get(&cache_pool, PR_WAITOK);
if (pc == NULL)
return NULL;
pool_cache_bootstrap(pc, size, align, align_offset, flags, wchan,
palloc, ipl, ctor, dtor, arg);
return pc;
}
/*
* pool_cache_bootstrap:
*
* Kernel-private version of pool_cache_init(). The caller
* provides initial storage.
*/
void
pool_cache_bootstrap(pool_cache_t pc, size_t size, u_int align,
u_int align_offset, u_int flags, const char *wchan,
struct pool_allocator *palloc, int ipl,
int (*ctor)(void *, void *, int), void (*dtor)(void *, void *),
void *arg)
{
CPU_INFO_ITERATOR cii;
pool_cache_t pc1;
struct cpu_info *ci;
struct pool *pp;
pp = &pc->pc_pool;
if (palloc == NULL && ipl == IPL_NONE)
palloc = &pool_allocator_nointr;
pool_init(pp, size, align, align_offset, flags, wchan, palloc, ipl);
mutex_init(&pc->pc_lock, MUTEX_DEFAULT, ipl);
if (ctor == NULL) {
ctor = (int (*)(void *, void *, int))nullop;
}
if (dtor == NULL) {
dtor = (void (*)(void *, void *))nullop;
}
pc->pc_emptygroups = NULL;
pc->pc_fullgroups = NULL;
pc->pc_partgroups = NULL;
pc->pc_ctor = ctor;
pc->pc_dtor = dtor;
pc->pc_arg = arg;
pc->pc_hits = 0;
pc->pc_misses = 0;
pc->pc_nempty = 0;
pc->pc_npart = 0;
pc->pc_nfull = 0;
pc->pc_contended = 0;
pc->pc_refcnt = 0;
pc->pc_freecheck = NULL;
if ((flags & PR_LARGECACHE) != 0) {
pc->pc_pcgsize = PCG_NOBJECTS_LARGE;
pc->pc_pcgpool = &pcg_large_pool;
} else {
pc->pc_pcgsize = PCG_NOBJECTS_NORMAL;
pc->pc_pcgpool = &pcg_normal_pool;
}
/* Allocate per-CPU caches. */
memset(pc->pc_cpus, 0, sizeof(pc->pc_cpus));
pc->pc_ncpu = 0;
if (ncpu < 2) {
/* XXX For sparc: boot CPU is not attached yet. */
pool_cache_cpu_init1(curcpu(), pc);
} else {
for (CPU_INFO_FOREACH(cii, ci)) {
pool_cache_cpu_init1(ci, pc);
}
}
/* Add to list of all pools. */
if (__predict_true(!cold))
mutex_enter(&pool_head_lock);
TAILQ_FOREACH(pc1, &pool_cache_head, pc_cachelist) {
if (strcmp(pc1->pc_pool.pr_wchan, pc->pc_pool.pr_wchan) > 0)
break;
}
if (pc1 == NULL)
TAILQ_INSERT_TAIL(&pool_cache_head, pc, pc_cachelist);
else
TAILQ_INSERT_BEFORE(pc1, pc, pc_cachelist);
if (__predict_true(!cold))
mutex_exit(&pool_head_lock);
membar_sync();
pp->pr_cache = pc;
}
/*
* pool_cache_destroy:
*
* Destroy a pool cache.
*/
void
pool_cache_destroy(pool_cache_t pc)
{
struct pool *pp = &pc->pc_pool;
u_int i;
/* Remove it from the global list. */
mutex_enter(&pool_head_lock);
while (pc->pc_refcnt != 0)
cv_wait(&pool_busy, &pool_head_lock);
TAILQ_REMOVE(&pool_cache_head, pc, pc_cachelist);
mutex_exit(&pool_head_lock);
/* First, invalidate the entire cache. */
pool_cache_invalidate(pc);
/* Disassociate it from the pool. */
mutex_enter(&pp->pr_lock);
pp->pr_cache = NULL;
mutex_exit(&pp->pr_lock);
/* Destroy per-CPU data */
for (i = 0; i < __arraycount(pc->pc_cpus); i++)
pool_cache_invalidate_cpu(pc, i);
/* Finally, destroy it. */
mutex_destroy(&pc->pc_lock);
pool_destroy(pp);
pool_put(&cache_pool, pc);
}
/*
* pool_cache_cpu_init1:
*
* Called for each pool_cache whenever a new CPU is attached.
*/
static void
pool_cache_cpu_init1(struct cpu_info *ci, pool_cache_t pc)
{
pool_cache_cpu_t *cc;
int index;
index = ci->ci_index;
KASSERT(index < __arraycount(pc->pc_cpus));
if ((cc = pc->pc_cpus[index]) != NULL) {
KASSERT(cc->cc_cpuindex == index);
return;
}
/*
* The first CPU is 'free'. This needs to be the case for
* bootstrap - we may not be able to allocate yet.
*/
if (pc->pc_ncpu == 0) {
cc = &pc->pc_cpu0;
pc->pc_ncpu = 1;
} else {
mutex_enter(&pc->pc_lock);
pc->pc_ncpu++;
mutex_exit(&pc->pc_lock);
cc = pool_get(&cache_cpu_pool, PR_WAITOK);
}
cc->cc_ipl = pc->pc_pool.pr_ipl;
cc->cc_iplcookie = makeiplcookie(cc->cc_ipl);
cc->cc_cache = pc;
cc->cc_cpuindex = index;
cc->cc_hits = 0;
cc->cc_misses = 0;
cc->cc_current = __UNCONST(&pcg_dummy);
cc->cc_previous = __UNCONST(&pcg_dummy);
pc->pc_cpus[index] = cc;
}
/*
* pool_cache_cpu_init:
*
* Called whenever a new CPU is attached.
*/
void
pool_cache_cpu_init(struct cpu_info *ci)
{
pool_cache_t pc;
mutex_enter(&pool_head_lock);
TAILQ_FOREACH(pc, &pool_cache_head, pc_cachelist) {
pc->pc_refcnt++;
mutex_exit(&pool_head_lock);
pool_cache_cpu_init1(ci, pc);
mutex_enter(&pool_head_lock);
pc->pc_refcnt--;
cv_broadcast(&pool_busy);
}
mutex_exit(&pool_head_lock);
}
/*
* pool_cache_reclaim:
*
* Reclaim memory from a pool cache.
*/
bool
pool_cache_reclaim(pool_cache_t pc)
{
return pool_reclaim(&pc->pc_pool);
}
static void
pool_cache_destruct_object1(pool_cache_t pc, void *object)
{
(*pc->pc_dtor)(pc->pc_arg, object);
pool_put(&pc->pc_pool, object);
}
/*
* pool_cache_destruct_object:
*
* Force destruction of an object and its release back into
* the pool.
*/
void
pool_cache_destruct_object(pool_cache_t pc, void *object)
{
FREECHECK_IN(&pc->pc_freecheck, object);
pool_cache_destruct_object1(pc, object);
}
/*
* pool_cache_invalidate_groups:
*
* Invalidate a chain of groups and destruct all objects.
*/
static void
pool_cache_invalidate_groups(pool_cache_t pc, pcg_t *pcg)
{
void *object;
pcg_t *next;
int i;
for (; pcg != NULL; pcg = next) {
next = pcg->pcg_next;
for (i = 0; i < pcg->pcg_avail; i++) {
object = pcg->pcg_objects[i].pcgo_va;
pool_cache_destruct_object1(pc, object);
}
if (pcg->pcg_size == PCG_NOBJECTS_LARGE) {
pool_put(&pcg_large_pool, pcg);
} else {
KASSERT(pcg->pcg_size == PCG_NOBJECTS_NORMAL);
pool_put(&pcg_normal_pool, pcg);
}
}
}
/*
* pool_cache_invalidate:
*
* Invalidate a pool cache (destruct and release all of the
* cached objects). Does not reclaim objects from the pool.
*
* Note: For pool caches that provide constructed objects, there
* is an assumption that another level of synchronization is occurring
* between the input to the constructor and the cache invalidation.
*/
void
pool_cache_invalidate(pool_cache_t pc)
{
pcg_t *full, *empty, *part;
#if 0
uint64_t where;
if (ncpu < 2 || !mp_online) {
/*
* We might be called early enough in the boot process
* for the CPU data structures to not be fully initialized.
* In this case, simply gather the local CPU's cache now
* since it will be the only one running.
*/
pool_cache_xcall(pc);
} else {
/*
* Gather all of the CPU-specific caches into the
* global cache.
*/
where = xc_broadcast(0, (xcfunc_t)pool_cache_xcall, pc, NULL);
xc_wait(where);
}
#endif
mutex_enter(&pc->pc_lock);
full = pc->pc_fullgroups;
empty = pc->pc_emptygroups;
part = pc->pc_partgroups;
pc->pc_fullgroups = NULL;
pc->pc_emptygroups = NULL;
pc->pc_partgroups = NULL;
pc->pc_nfull = 0;
pc->pc_nempty = 0;
pc->pc_npart = 0;
mutex_exit(&pc->pc_lock);
pool_cache_invalidate_groups(pc, full);
pool_cache_invalidate_groups(pc, empty);
pool_cache_invalidate_groups(pc, part);
}
/*
* pool_cache_invalidate_cpu:
*
* Invalidate all CPU-bound cached objects in pool cache, the CPU being
* identified by its associated index.
* It is caller's responsibility to ensure that no operation is
* taking place on this pool cache while doing this invalidation.
* WARNING: as no inter-CPU locking is enforced, trying to invalidate
* pool cached objects from a CPU different from the one currently running
* may result in an undefined behaviour.
*/
static void
pool_cache_invalidate_cpu(pool_cache_t pc, u_int index)
{
pool_cache_cpu_t *cc;
pcg_t *pcg;
if ((cc = pc->pc_cpus[index]) == NULL)
return;
if ((pcg = cc->cc_current) != &pcg_dummy) {
pcg->pcg_next = NULL;
pool_cache_invalidate_groups(pc, pcg);
}
if ((pcg = cc->cc_previous) != &pcg_dummy) {
pcg->pcg_next = NULL;
pool_cache_invalidate_groups(pc, pcg);
}
if (cc != &pc->pc_cpu0)
pool_put(&cache_cpu_pool, cc);
}
void
pool_cache_set_drain_hook(pool_cache_t pc, void (*fn)(void *, int), void *arg)
{
pool_set_drain_hook(&pc->pc_pool, fn, arg);
}
void
pool_cache_setlowat(pool_cache_t pc, int n)
{
pool_setlowat(&pc->pc_pool, n);
}
void
pool_cache_sethiwat(pool_cache_t pc, int n)
{
pool_sethiwat(&pc->pc_pool, n);
}
void
pool_cache_sethardlimit(pool_cache_t pc, int n, const char *warnmess, int ratecap)
{
pool_sethardlimit(&pc->pc_pool, n, warnmess, ratecap);
}
static bool __noinline
pool_cache_get_slow(pool_cache_cpu_t *cc, int s, void **objectp,
paddr_t *pap, int flags)
{
pcg_t *pcg, *cur;
uint64_t ncsw;
pool_cache_t pc;
void *object;
KASSERT(cc->cc_current->pcg_avail == 0);
KASSERT(cc->cc_previous->pcg_avail == 0);
pc = cc->cc_cache;
cc->cc_misses++;
/*
* Nothing was available locally. Try and grab a group
* from the cache.
*/
if (__predict_false(!mutex_tryenter(&pc->pc_lock))) {
ncsw = curlwp->l_ncsw;
mutex_enter(&pc->pc_lock);
pc->pc_contended++;
/*
* If we context switched while locking, then
* our view of the per-CPU data is invalid:
* retry.
*/
if (curlwp->l_ncsw != ncsw) {
mutex_exit(&pc->pc_lock);
return true;
}
}
if (__predict_true((pcg = pc->pc_fullgroups) != NULL)) {
/*
* If there's a full group, release our empty
* group back to the cache. Install the full
* group as cc_current and return.
*/
if (__predict_true((cur = cc->cc_current) != &pcg_dummy)) {
KASSERT(cur->pcg_avail == 0);
cur->pcg_next = pc->pc_emptygroups;
pc->pc_emptygroups = cur;
pc->pc_nempty++;
}
KASSERT(pcg->pcg_avail == pcg->pcg_size);
cc->cc_current = pcg;
pc->pc_fullgroups = pcg->pcg_next;
pc->pc_hits++;
pc->pc_nfull--;
mutex_exit(&pc->pc_lock);
return true;
}
/*
* Nothing available locally or in cache. Take the slow
* path: fetch a new object from the pool and construct
* it.
*/
pc->pc_misses++;
mutex_exit(&pc->pc_lock);
splx(s);
object = pool_get(&pc->pc_pool, flags);
*objectp = object;
if (__predict_false(object == NULL))
return false;
if (__predict_false((*pc->pc_ctor)(pc->pc_arg, object, flags) != 0)) {
pool_put(&pc->pc_pool, object);
*objectp = NULL;
return false;
}
KASSERT((((vaddr_t)object + pc->pc_pool.pr_itemoffset) &
(pc->pc_pool.pr_align - 1)) == 0);
if (pap != NULL) {
#ifdef POOL_VTOPHYS
*pap = POOL_VTOPHYS(object);
#else
*pap = POOL_PADDR_INVALID;
#endif
}
FREECHECK_OUT(&pc->pc_freecheck, object);
return false;
}
/*
* pool_cache_get{,_paddr}:
*
* Get an object from a pool cache (optionally returning
* the physical address of the object).
*/
void *
pool_cache_get_paddr(pool_cache_t pc, int flags, paddr_t *pap)
{
pool_cache_cpu_t *cc;
pcg_t *pcg;
void *object;
int s;
KASSERTMSG((!cpu_intr_p() && !cpu_softintr_p()) ||
(pc->pc_pool.pr_ipl != IPL_NONE || cold || panicstr != NULL),
("pool '%s' is IPL_NONE, but called from interrupt context\n",
pc->pc_pool.pr_wchan));
if (flags & PR_WAITOK) {
ASSERT_SLEEPABLE();
}
/* Lock out interrupts and disable preemption. */
s = splvm();
while (/* CONSTCOND */ true) {
/* Try and allocate an object from the current group. */
cc = pc->pc_cpus[curcpu()->ci_index];
KASSERT(cc->cc_cache == pc);
pcg = cc->cc_current;
if (__predict_true(pcg->pcg_avail > 0)) {
object = pcg->pcg_objects[--pcg->pcg_avail].pcgo_va;
if (__predict_false(pap != NULL))
*pap = pcg->pcg_objects[pcg->pcg_avail].pcgo_pa;
#if defined(DIAGNOSTIC)
pcg->pcg_objects[pcg->pcg_avail].pcgo_va = NULL;
KASSERT(pcg->pcg_avail < pcg->pcg_size);
KASSERT(object != NULL);
#endif
cc->cc_hits++;
splx(s);
FREECHECK_OUT(&pc->pc_freecheck, object);
return object;
}
/*
* That failed. If the previous group isn't empty, swap
* it with the current group and allocate from there.
*/
pcg = cc->cc_previous;
if (__predict_true(pcg->pcg_avail > 0)) {
cc->cc_previous = cc->cc_current;
cc->cc_current = pcg;
continue;
}
/*
* Can't allocate from either group: try the slow path.
* If get_slow() allocated an object for us, or if
* no more objects are available, it will return false.
* Otherwise, we need to retry.
*/
if (!pool_cache_get_slow(cc, s, &object, pap, flags))
break;
}
return object;
}
static bool __noinline
pool_cache_put_slow(pool_cache_cpu_t *cc, int s, void *object)
{
pcg_t *pcg, *cur;
uint64_t ncsw;
pool_cache_t pc;
KASSERT(cc->cc_current->pcg_avail == cc->cc_current->pcg_size);
KASSERT(cc->cc_previous->pcg_avail == cc->cc_previous->pcg_size);
pc = cc->cc_cache;
pcg = NULL;
cc->cc_misses++;
/*
* If there are no empty groups in the cache then allocate one
* while still unlocked.
*/
if (__predict_false(pc->pc_emptygroups == NULL)) {
if (__predict_true(!pool_cache_disable)) {
pcg = pool_get(pc->pc_pcgpool, PR_NOWAIT);
}
if (__predict_true(pcg != NULL)) {
pcg->pcg_avail = 0;
pcg->pcg_size = pc->pc_pcgsize;
}
}
/* Lock the cache. */
if (__predict_false(!mutex_tryenter(&pc->pc_lock))) {
ncsw = curlwp->l_ncsw;
mutex_enter(&pc->pc_lock);
pc->pc_contended++;
/*
* If we context switched while locking, then our view of
* the per-CPU data is invalid: retry.
*/
if (__predict_false(curlwp->l_ncsw != ncsw)) {
mutex_exit(&pc->pc_lock);
if (pcg != NULL) {
pool_put(pc->pc_pcgpool, pcg);
}
return true;
}
}
/* If there are no empty groups in the cache then allocate one. */
if (pcg == NULL && pc->pc_emptygroups != NULL) {
pcg = pc->pc_emptygroups;
pc->pc_emptygroups = pcg->pcg_next;
pc->pc_nempty--;
}
/*
* If there's a empty group, release our full group back
* to the cache. Install the empty group to the local CPU
* and return.
*/
if (pcg != NULL) {
KASSERT(pcg->pcg_avail == 0);
if (__predict_false(cc->cc_previous == &pcg_dummy)) {
cc->cc_previous = pcg;
} else {
cur = cc->cc_current;
if (__predict_true(cur != &pcg_dummy)) {
KASSERT(cur->pcg_avail == cur->pcg_size);
cur->pcg_next = pc->pc_fullgroups;
pc->pc_fullgroups = cur;
pc->pc_nfull++;
}
cc->cc_current = pcg;
}
pc->pc_hits++;
mutex_exit(&pc->pc_lock);
return true;
}
/*
* Nothing available locally or in cache, and we didn't
* allocate an empty group. Take the slow path and destroy
* the object here and now.
*/
pc->pc_misses++;
mutex_exit(&pc->pc_lock);
splx(s);
pool_cache_destruct_object(pc, object);
return false;
}
/*
* 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(pool_cache_t pc, void *object, paddr_t pa)
{
pool_cache_cpu_t *cc;
pcg_t *pcg;
int s;
KASSERT(object != NULL);
FREECHECK_IN(&pc->pc_freecheck, object);
/* Lock out interrupts and disable preemption. */
s = splvm();
while (/* CONSTCOND */ true) {
/* If the current group isn't full, release it there. */
cc = pc->pc_cpus[curcpu()->ci_index];
KASSERT(cc->cc_cache == pc);
pcg = cc->cc_current;
if (__predict_true(pcg->pcg_avail < pcg->pcg_size)) {
pcg->pcg_objects[pcg->pcg_avail].pcgo_va = object;
pcg->pcg_objects[pcg->pcg_avail].pcgo_pa = pa;
pcg->pcg_avail++;
cc->cc_hits++;
splx(s);
return;
}
/*
* That failed. If the previous group isn't full, swap
* it with the current group and try again.
*/
pcg = cc->cc_previous;
if (__predict_true(pcg->pcg_avail < pcg->pcg_size)) {
cc->cc_previous = cc->cc_current;
cc->cc_current = pcg;
continue;
}
/*
* Can't free to either group: try the slow path.
* If put_slow() releases the object for us, it
* will return false. Otherwise we need to retry.
*/
if (!pool_cache_put_slow(cc, s, object))
break;
}
}
/*
* pool_cache_xcall:
*
* Transfer objects from the per-CPU cache to the global cache.
* Run within a cross-call thread.
*/
static void
pool_cache_xcall(pool_cache_t pc)
{
pool_cache_cpu_t *cc;
pcg_t *prev, *cur, **list;
int s;
s = splvm();
mutex_enter(&pc->pc_lock);
cc = pc->pc_cpus[curcpu()->ci_index];
cur = cc->cc_current;
cc->cc_current = __UNCONST(&pcg_dummy);
prev = cc->cc_previous;
cc->cc_previous = __UNCONST(&pcg_dummy);
if (cur != &pcg_dummy) {
if (cur->pcg_avail == cur->pcg_size) {
list = &pc->pc_fullgroups;
pc->pc_nfull++;
} else if (cur->pcg_avail == 0) {
list = &pc->pc_emptygroups;
pc->pc_nempty++;
} else {
list = &pc->pc_partgroups;
pc->pc_npart++;
}
cur->pcg_next = *list;
*list = cur;
}
if (prev != &pcg_dummy) {
if (prev->pcg_avail == prev->pcg_size) {
list = &pc->pc_fullgroups;
pc->pc_nfull++;
} else if (prev->pcg_avail == 0) {
list = &pc->pc_emptygroups;
pc->pc_nempty++;
} else {
list = &pc->pc_partgroups;
pc->pc_npart++;
}
prev->pcg_next = *list;
*list = prev;
}
mutex_exit(&pc->pc_lock);
splx(s);
}
/*
* 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 *);
#ifdef POOL_SUBPAGE
struct pool_allocator pool_allocator_kmem_fullpage = {
pool_page_alloc, pool_page_free, 0,
.pa_backingmapptr = &kmem_map,
};
#else
struct pool_allocator pool_allocator_kmem = {
pool_page_alloc, pool_page_free, 0,
.pa_backingmapptr = &kmem_map,
};
#endif
void *pool_page_alloc_nointr(struct pool *, int);
void pool_page_free_nointr(struct pool *, void *);
#ifdef POOL_SUBPAGE
struct pool_allocator pool_allocator_nointr_fullpage = {
pool_page_alloc_nointr, pool_page_free_nointr, 0,
.pa_backingmapptr = &kernel_map,
};
#else
struct pool_allocator pool_allocator_nointr = {
pool_page_alloc_nointr, pool_page_free_nointr, 0,
.pa_backingmapptr = &kernel_map,
};
#endif
#ifdef POOL_SUBPAGE
void *pool_subpage_alloc(struct pool *, int);
void pool_subpage_free(struct pool *, void *);
struct pool_allocator pool_allocator_kmem = {
pool_subpage_alloc, pool_subpage_free, POOL_SUBPAGE,
.pa_backingmapptr = &kmem_map,
};
void *pool_subpage_alloc_nointr(struct pool *, int);
void pool_subpage_free_nointr(struct pool *, void *);
struct pool_allocator pool_allocator_nointr = {
pool_subpage_alloc, pool_subpage_free, POOL_SUBPAGE,
.pa_backingmapptr = &kmem_map,
};
#endif /* POOL_SUBPAGE */
static void *
pool_allocator_alloc(struct pool *pp, int flags)
{
struct pool_allocator *pa = pp->pr_alloc;
void *res;
res = (*pa->pa_alloc)(pp, flags);
if (res == NULL && (flags & PR_WAITOK) == 0) {
/*
* We only run the drain hook here if PR_NOWAIT.
* In other cases, the hook will be run in
* pool_reclaim().
*/
if (pp->pr_drain_hook != NULL) {
(*pp->pr_drain_hook)(pp->pr_drain_hook_arg, flags);
res = (*pa->pa_alloc)(pp, flags);
}
}
return res;
}
static void
pool_allocator_free(struct pool *pp, void *v)
{
struct pool_allocator *pa = pp->pr_alloc;
(*pa->pa_free)(pp, v);
}
void *
pool_page_alloc(struct pool *pp, int flags)
{
bool waitok = (flags & PR_WAITOK) ? true : false;
return ((void *) uvm_km_alloc_poolpage_cache(kmem_map, waitok));
}
void
pool_page_free(struct pool *pp, void *v)
{
uvm_km_free_poolpage_cache(kmem_map, (vaddr_t) v);
}
static void *
pool_page_alloc_meta(struct pool *pp, int flags)
{
bool waitok = (flags & PR_WAITOK) ? true : false;
return ((void *) uvm_km_alloc_poolpage(kmem_map, waitok));
}
static void
pool_page_free_meta(struct pool *pp, void *v)
{
uvm_km_free_poolpage(kmem_map, (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_subpage_alloc_nointr(struct pool *pp, int flags)
{
return (pool_subpage_alloc(pp, flags));
}
void
pool_subpage_free_nointr(struct pool *pp, void *v)
{
pool_subpage_free(pp, v);
}
#endif /* POOL_SUBPAGE */
void *
pool_page_alloc_nointr(struct pool *pp, int flags)
{
bool waitok = (flags & PR_WAITOK) ? true : false;
return ((void *) uvm_km_alloc_poolpage_cache(kernel_map, waitok));
}
void
pool_page_free_nointr(struct pool *pp, void *v)
{
uvm_km_free_poolpage_cache(kernel_map, (vaddr_t) v);
}
#if defined(DDB)
static bool
pool_in_page(struct pool *pp, struct pool_item_header *ph, uintptr_t addr)
{
return (uintptr_t)ph->ph_page <= addr &&
addr < (uintptr_t)ph->ph_page + pp->pr_alloc->pa_pagesz;
}
static bool
pool_in_item(struct pool *pp, void *item, uintptr_t addr)
{
return (uintptr_t)item <= addr && addr < (uintptr_t)item + pp->pr_size;
}
static bool
pool_in_cg(struct pool *pp, struct pool_cache_group *pcg, uintptr_t addr)
{
int i;
if (pcg == NULL) {
return false;
}
for (i = 0; i < pcg->pcg_avail; i++) {
if (pool_in_item(pp, pcg->pcg_objects[i].pcgo_va, addr)) {
return true;
}
}
return false;
}
static bool
pool_allocated(struct pool *pp, struct pool_item_header *ph, uintptr_t addr)
{
if ((pp->pr_roflags & PR_NOTOUCH) != 0) {
unsigned int idx = pr_item_notouch_index(pp, ph, (void *)addr);
pool_item_bitmap_t *bitmap =
ph->ph_bitmap + (idx / BITMAP_SIZE);
pool_item_bitmap_t mask = 1 << (idx & BITMAP_MASK);
return (*bitmap & mask) == 0;
} else {
struct pool_item *pi;
LIST_FOREACH(pi, &ph->ph_itemlist, pi_list) {
if (pool_in_item(pp, pi, addr)) {
return false;
}
}
return true;
}
}
void
pool_whatis(uintptr_t addr, void (*pr)(const char *, ...))
{
struct pool *pp;
TAILQ_FOREACH(pp, &pool_head, pr_poollist) {
struct pool_item_header *ph;
uintptr_t item;
bool allocated = true;
bool incache = false;
bool incpucache = false;
char cpucachestr[32];
if ((pp->pr_roflags & PR_PHINPAGE) != 0) {
LIST_FOREACH(ph, &pp->pr_fullpages, ph_pagelist) {
if (pool_in_page(pp, ph, addr)) {
goto found;
}
}
LIST_FOREACH(ph, &pp->pr_partpages, ph_pagelist) {
if (pool_in_page(pp, ph, addr)) {
allocated =
pool_allocated(pp, ph, addr);
goto found;
}
}
LIST_FOREACH(ph, &pp->pr_emptypages, ph_pagelist) {
if (pool_in_page(pp, ph, addr)) {
allocated = false;
goto found;
}
}
continue;
} else {
ph = pr_find_pagehead_noalign(pp, (void *)addr);
if (ph == NULL || !pool_in_page(pp, ph, addr)) {
continue;
}
allocated = pool_allocated(pp, ph, addr);
}
found:
if (allocated && pp->pr_cache) {
pool_cache_t pc = pp->pr_cache;
struct pool_cache_group *pcg;
int i;
for (pcg = pc->pc_fullgroups; pcg != NULL;
pcg = pcg->pcg_next) {
if (pool_in_cg(pp, pcg, addr)) {
incache = true;
goto print;
}
}
for (i = 0; i < __arraycount(pc->pc_cpus); i++) {
pool_cache_cpu_t *cc;
if ((cc = pc->pc_cpus[i]) == NULL) {
continue;
}
if (pool_in_cg(pp, cc->cc_current, addr) ||
pool_in_cg(pp, cc->cc_previous, addr)) {
struct cpu_info *ci =
cpu_lookup(i);
incpucache = true;
snprintf(cpucachestr,
sizeof(cpucachestr),
"cached by CPU %u",
ci->ci_index);
goto print;
}
}
}
print:
item = (uintptr_t)ph->ph_page + ph->ph_off;
item = item + rounddown(addr - item, pp->pr_size);
(*pr)("%p is %p+%zu in POOL '%s' (%s)\n",
(void *)addr, item, (size_t)(addr - item),
pp->pr_wchan,
incpucache ? cpucachestr :
incache ? "cached" : allocated ? "allocated" : "free");
}
}
#endif /* defined(DDB) */
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