/
subr_pool.c
2297 lines (1900 loc) · 52.1 KB
/
subr_pool.c
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/* $OpenBSD: subr_pool.c,v 1.228 2019/07/19 09:03:03 bluhm Exp $ */
/* $NetBSD: subr_pool.c,v 1.61 2001/09/26 07:14:56 chs Exp $ */
/*-
* Copyright (c) 1997, 1999, 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Paul Kranenburg; by Jason R. Thorpe of the Numerical Aerospace
* Simulation Facility, NASA Ames Research Center.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 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/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/pool.h>
#include <sys/proc.h>
#include <sys/syslog.h>
#include <sys/sysctl.h>
#include <sys/task.h>
#include <sys/timeout.h>
#include <sys/percpu.h>
#include <uvm/uvm_extern.h>
/*
* 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_items' 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 */
SIMPLEQ_HEAD(,pool) pool_head = SIMPLEQ_HEAD_INITIALIZER(pool_head);
/*
* Every pool gets a unique serial number assigned to it. If this counter
* wraps, we're screwed, but we shouldn't create so many pools anyway.
*/
unsigned int pool_serial;
unsigned int pool_count;
/* Lock the previous variables making up the global pool state */
struct rwlock pool_lock = RWLOCK_INITIALIZER("pools");
/* Private pool for page header structures */
struct pool phpool;
struct pool_lock_ops {
void (*pl_init)(struct pool *, union pool_lock *,
const struct lock_type *);
void (*pl_enter)(union pool_lock *);
int (*pl_enter_try)(union pool_lock *);
void (*pl_leave)(union pool_lock *);
void (*pl_assert_locked)(union pool_lock *);
void (*pl_assert_unlocked)(union pool_lock *);
int (*pl_sleep)(void *, union pool_lock *, int, const char *, int);
};
static const struct pool_lock_ops pool_lock_ops_mtx;
static const struct pool_lock_ops pool_lock_ops_rw;
#ifdef WITNESS
#define pl_init(pp, pl) do { \
static const struct lock_type __lock_type = { .lt_name = #pl }; \
(pp)->pr_lock_ops->pl_init(pp, pl, &__lock_type); \
} while (0)
#else /* WITNESS */
#define pl_init(pp, pl) (pp)->pr_lock_ops->pl_init(pp, pl, NULL)
#endif /* WITNESS */
static inline void
pl_enter(struct pool *pp, union pool_lock *pl)
{
pp->pr_lock_ops->pl_enter(pl);
}
static inline int
pl_enter_try(struct pool *pp, union pool_lock *pl)
{
return pp->pr_lock_ops->pl_enter_try(pl);
}
static inline void
pl_leave(struct pool *pp, union pool_lock *pl)
{
pp->pr_lock_ops->pl_leave(pl);
}
static inline void
pl_assert_locked(struct pool *pp, union pool_lock *pl)
{
pp->pr_lock_ops->pl_assert_locked(pl);
}
static inline void
pl_assert_unlocked(struct pool *pp, union pool_lock *pl)
{
pp->pr_lock_ops->pl_assert_unlocked(pl);
}
static inline int
pl_sleep(struct pool *pp, void *ident, union pool_lock *lock, int priority,
const char *wmesg, int timo)
{
return pp->pr_lock_ops->pl_sleep(ident, lock, priority, wmesg, timo);
}
struct pool_item {
u_long pi_magic;
XSIMPLEQ_ENTRY(pool_item) pi_list;
};
#define POOL_IMAGIC(ph, pi) ((u_long)(pi) ^ (ph)->ph_magic)
struct pool_page_header {
/* Page headers */
TAILQ_ENTRY(pool_page_header)
ph_entry; /* pool page list */
XSIMPLEQ_HEAD(, pool_item)
ph_items; /* free items on the page */
RBT_ENTRY(pool_page_header)
ph_node; /* off-page page headers */
unsigned int ph_nmissing; /* # of chunks in use */
caddr_t ph_page; /* this page's address */
caddr_t ph_colored; /* page's colored address */
unsigned long ph_magic;
int ph_tick;
};
#define POOL_MAGICBIT (1 << 3) /* keep away from perturbed low bits */
#define POOL_PHPOISON(ph) ISSET((ph)->ph_magic, POOL_MAGICBIT)
#ifdef MULTIPROCESSOR
struct pool_cache_item {
struct pool_cache_item *ci_next; /* next item in list */
unsigned long ci_nitems; /* number of items in list */
TAILQ_ENTRY(pool_cache_item)
ci_nextl; /* entry in list of lists */
};
/* we store whether the cached item is poisoned in the high bit of nitems */
#define POOL_CACHE_ITEM_NITEMS_MASK 0x7ffffffUL
#define POOL_CACHE_ITEM_NITEMS_POISON 0x8000000UL
#define POOL_CACHE_ITEM_NITEMS(_ci) \
((_ci)->ci_nitems & POOL_CACHE_ITEM_NITEMS_MASK)
#define POOL_CACHE_ITEM_POISONED(_ci) \
ISSET((_ci)->ci_nitems, POOL_CACHE_ITEM_NITEMS_POISON)
struct pool_cache {
struct pool_cache_item *pc_actv; /* active list of items */
unsigned long pc_nactv; /* actv head nitems cache */
struct pool_cache_item *pc_prev; /* previous list of items */
uint64_t pc_gen; /* generation number */
uint64_t pc_nget; /* # of successful requests */
uint64_t pc_nfail; /* # of unsuccessful reqs */
uint64_t pc_nput; /* # of releases */
uint64_t pc_nlget; /* # of list requests */
uint64_t pc_nlfail; /* # of fails getting a list */
uint64_t pc_nlput; /* # of list releases */
int pc_nout;
};
void *pool_cache_get(struct pool *);
void pool_cache_put(struct pool *, void *);
void pool_cache_destroy(struct pool *);
void pool_cache_gc(struct pool *);
#endif
void pool_cache_pool_info(struct pool *, struct kinfo_pool *);
int pool_cache_info(struct pool *, void *, size_t *);
int pool_cache_cpus_info(struct pool *, void *, size_t *);
#ifdef POOL_DEBUG
int pool_debug = 1;
#else
int pool_debug = 0;
#endif
#define POOL_INPGHDR(pp) ((pp)->pr_phoffset != 0)
struct pool_page_header *
pool_p_alloc(struct pool *, int, int *);
void pool_p_insert(struct pool *, struct pool_page_header *);
void pool_p_remove(struct pool *, struct pool_page_header *);
void pool_p_free(struct pool *, struct pool_page_header *);
void pool_update_curpage(struct pool *);
void *pool_do_get(struct pool *, int, int *);
void pool_do_put(struct pool *, void *);
int pool_chk_page(struct pool *, struct pool_page_header *, int);
int pool_chk(struct pool *);
void pool_get_done(struct pool *, void *, void *);
void pool_runqueue(struct pool *, int);
void *pool_allocator_alloc(struct pool *, int, int *);
void pool_allocator_free(struct pool *, void *);
/*
* The default pool allocator.
*/
void *pool_page_alloc(struct pool *, int, int *);
void pool_page_free(struct pool *, void *);
/*
* safe for interrupts; this is the default allocator
*/
struct pool_allocator pool_allocator_single = {
pool_page_alloc,
pool_page_free,
POOL_ALLOC_SIZE(PAGE_SIZE, POOL_ALLOC_ALIGNED)
};
void *pool_multi_alloc(struct pool *, int, int *);
void pool_multi_free(struct pool *, void *);
struct pool_allocator pool_allocator_multi = {
pool_multi_alloc,
pool_multi_free,
POOL_ALLOC_SIZES(PAGE_SIZE, (1UL << 31), POOL_ALLOC_ALIGNED)
};
void *pool_multi_alloc_ni(struct pool *, int, int *);
void pool_multi_free_ni(struct pool *, void *);
struct pool_allocator pool_allocator_multi_ni = {
pool_multi_alloc_ni,
pool_multi_free_ni,
POOL_ALLOC_SIZES(PAGE_SIZE, (1UL << 31), POOL_ALLOC_ALIGNED)
};
#ifdef DDB
void pool_print_pagelist(struct pool_pagelist *, int (*)(const char *, ...)
__attribute__((__format__(__kprintf__,1,2))));
void pool_print1(struct pool *, const char *, int (*)(const char *, ...)
__attribute__((__format__(__kprintf__,1,2))));
#endif
/* stale page garbage collectors */
void pool_gc_sched(void *);
struct timeout pool_gc_tick = TIMEOUT_INITIALIZER(pool_gc_sched, NULL);
void pool_gc_pages(void *);
struct task pool_gc_task = TASK_INITIALIZER(pool_gc_pages, NULL);
int pool_wait_free = 1;
int pool_wait_gc = 8;
RBT_PROTOTYPE(phtree, pool_page_header, ph_node, phtree_compare);
static inline int
phtree_compare(const struct pool_page_header *a,
const struct pool_page_header *b)
{
vaddr_t va = (vaddr_t)a->ph_page;
vaddr_t vb = (vaddr_t)b->ph_page;
/* the compares in this order are important for the NFIND to work */
if (vb < va)
return (-1);
if (vb > va)
return (1);
return (0);
}
RBT_GENERATE(phtree, pool_page_header, ph_node, phtree_compare);
/*
* Return the pool page header based on page address.
*/
static inline struct pool_page_header *
pr_find_pagehead(struct pool *pp, void *v)
{
struct pool_page_header *ph, key;
if (POOL_INPGHDR(pp)) {
caddr_t page;
page = (caddr_t)((vaddr_t)v & pp->pr_pgmask);
return ((struct pool_page_header *)(page + pp->pr_phoffset));
}
key.ph_page = v;
ph = RBT_NFIND(phtree, &pp->pr_phtree, &key);
if (ph == NULL)
panic("%s: %s: page header missing", __func__, pp->pr_wchan);
KASSERT(ph->ph_page <= (caddr_t)v);
if (ph->ph_page + pp->pr_pgsize <= (caddr_t)v)
panic("%s: %s: incorrect page", __func__, pp->pr_wchan);
return (ph);
}
/*
* 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, int ipl, int flags,
const char *wchan, struct pool_allocator *palloc)
{
int off = 0, space;
unsigned int pgsize = PAGE_SIZE, items;
size_t pa_pagesz;
#ifdef DIAGNOSTIC
struct pool *iter;
#endif
if (align == 0)
align = ALIGN(1);
if (size < sizeof(struct pool_item))
size = sizeof(struct pool_item);
size = roundup(size, align);
while (size * 8 > pgsize)
pgsize <<= 1;
if (palloc == NULL) {
if (pgsize > PAGE_SIZE) {
palloc = ISSET(flags, PR_WAITOK) ?
&pool_allocator_multi_ni : &pool_allocator_multi;
} else
palloc = &pool_allocator_single;
pa_pagesz = palloc->pa_pagesz;
} else {
size_t pgsizes;
pa_pagesz = palloc->pa_pagesz;
if (pa_pagesz == 0)
pa_pagesz = POOL_ALLOC_DEFAULT;
pgsizes = pa_pagesz & ~POOL_ALLOC_ALIGNED;
/* make sure the allocator can fit at least one item */
if (size > pgsizes) {
panic("%s: pool %s item size 0x%zx > "
"allocator %p sizes 0x%zx", __func__, wchan,
size, palloc, pgsizes);
}
/* shrink pgsize until it fits into the range */
while (!ISSET(pgsizes, pgsize))
pgsize >>= 1;
}
KASSERT(ISSET(pa_pagesz, pgsize));
items = pgsize / size;
/*
* Decide whether to put the page header off page to avoid
* wasting too large a part of the page. Off-page page headers
* go into an RB tree, so we can match a returned item with
* its header based on the page address.
*/
if (ISSET(pa_pagesz, POOL_ALLOC_ALIGNED)) {
if (pgsize - (size * items) >
sizeof(struct pool_page_header)) {
off = pgsize - sizeof(struct pool_page_header);
} else if (sizeof(struct pool_page_header) * 2 >= size) {
off = pgsize - sizeof(struct pool_page_header);
items = off / size;
}
}
KASSERT(items > 0);
/*
* Initialize the pool structure.
*/
memset(pp, 0, sizeof(*pp));
if (ISSET(flags, PR_RWLOCK)) {
KASSERT(flags & PR_WAITOK);
pp->pr_lock_ops = &pool_lock_ops_rw;
} else
pp->pr_lock_ops = &pool_lock_ops_mtx;
TAILQ_INIT(&pp->pr_emptypages);
TAILQ_INIT(&pp->pr_fullpages);
TAILQ_INIT(&pp->pr_partpages);
pp->pr_curpage = NULL;
pp->pr_npages = 0;
pp->pr_minitems = 0;
pp->pr_minpages = 0;
pp->pr_maxpages = 8;
pp->pr_size = size;
pp->pr_pgsize = pgsize;
pp->pr_pgmask = ~0UL ^ (pgsize - 1);
pp->pr_phoffset = off;
pp->pr_itemsperpage = items;
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;
RBT_INIT(phtree, &pp->pr_phtree);
/*
* Use the space between the chunks and the page header
* for cache coloring.
*/
space = POOL_INPGHDR(pp) ? pp->pr_phoffset : pp->pr_pgsize;
space -= pp->pr_itemsperpage * pp->pr_size;
pp->pr_align = align;
pp->pr_maxcolors = (space / align) + 1;
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_ipl = ipl;
pp->pr_flags = flags;
pl_init(pp, &pp->pr_lock);
pl_init(pp, &pp->pr_requests_lock);
TAILQ_INIT(&pp->pr_requests);
if (phpool.pr_size == 0) {
pool_init(&phpool, sizeof(struct pool_page_header), 0,
IPL_HIGH, 0, "phpool", NULL);
/* make sure phpool wont "recurse" */
KASSERT(POOL_INPGHDR(&phpool));
}
/* pglistalloc/constraint parameters */
pp->pr_crange = &kp_dirty;
/* Insert this into the list of all pools. */
rw_enter_write(&pool_lock);
#ifdef DIAGNOSTIC
SIMPLEQ_FOREACH(iter, &pool_head, pr_poollist) {
if (iter == pp)
panic("%s: pool %s already on list", __func__, wchan);
}
#endif
pp->pr_serial = ++pool_serial;
if (pool_serial == 0)
panic("%s: too much uptime", __func__);
SIMPLEQ_INSERT_HEAD(&pool_head, pp, pr_poollist);
pool_count++;
rw_exit_write(&pool_lock);
}
/*
* Decommission a pool resource.
*/
void
pool_destroy(struct pool *pp)
{
struct pool_page_header *ph;
struct pool *prev, *iter;
#ifdef MULTIPROCESSOR
if (pp->pr_cache != NULL)
pool_cache_destroy(pp);
#endif
#ifdef DIAGNOSTIC
if (pp->pr_nout != 0)
panic("%s: pool busy: still out: %u", __func__, pp->pr_nout);
#endif
/* Remove from global pool list */
rw_enter_write(&pool_lock);
pool_count--;
if (pp == SIMPLEQ_FIRST(&pool_head))
SIMPLEQ_REMOVE_HEAD(&pool_head, pr_poollist);
else {
prev = SIMPLEQ_FIRST(&pool_head);
SIMPLEQ_FOREACH(iter, &pool_head, pr_poollist) {
if (iter == pp) {
SIMPLEQ_REMOVE_AFTER(&pool_head, prev,
pr_poollist);
break;
}
prev = iter;
}
}
rw_exit_write(&pool_lock);
/* Remove all pages */
while ((ph = TAILQ_FIRST(&pp->pr_emptypages)) != NULL) {
pl_enter(pp, &pp->pr_lock);
pool_p_remove(pp, ph);
pl_leave(pp, &pp->pr_lock);
pool_p_free(pp, ph);
}
KASSERT(TAILQ_EMPTY(&pp->pr_fullpages));
KASSERT(TAILQ_EMPTY(&pp->pr_partpages));
}
void
pool_request_init(struct pool_request *pr,
void (*handler)(struct pool *, void *, void *), void *cookie)
{
pr->pr_handler = handler;
pr->pr_cookie = cookie;
pr->pr_item = NULL;
}
void
pool_request(struct pool *pp, struct pool_request *pr)
{
pl_enter(pp, &pp->pr_requests_lock);
TAILQ_INSERT_TAIL(&pp->pr_requests, pr, pr_entry);
pool_runqueue(pp, PR_NOWAIT);
pl_leave(pp, &pp->pr_requests_lock);
}
struct pool_get_memory {
union pool_lock lock;
void * volatile v;
};
/*
* Grab an item from the pool.
*/
void *
pool_get(struct pool *pp, int flags)
{
void *v = NULL;
int slowdown = 0;
KASSERT(flags & (PR_WAITOK | PR_NOWAIT));
if (pp->pr_flags & PR_RWLOCK)
KASSERT(flags & PR_WAITOK);
#ifdef MULTIPROCESSOR
if (pp->pr_cache != NULL) {
v = pool_cache_get(pp);
if (v != NULL)
goto good;
}
#endif
pl_enter(pp, &pp->pr_lock);
if (pp->pr_nout >= pp->pr_hardlimit) {
if (ISSET(flags, PR_NOWAIT|PR_LIMITFAIL))
goto fail;
} else if ((v = pool_do_get(pp, flags, &slowdown)) == NULL) {
if (ISSET(flags, PR_NOWAIT))
goto fail;
}
pl_leave(pp, &pp->pr_lock);
if ((slowdown || pool_debug == 2) && ISSET(flags, PR_WAITOK))
yield();
if (v == NULL) {
struct pool_get_memory mem = { .v = NULL };
struct pool_request pr;
#ifdef DIAGNOSTIC
if (ISSET(flags, PR_WAITOK) && curproc == &proc0)
panic("%s: cannot sleep for memory during boot",
__func__);
#endif
pl_init(pp, &mem.lock);
pool_request_init(&pr, pool_get_done, &mem);
pool_request(pp, &pr);
pl_enter(pp, &mem.lock);
while (mem.v == NULL)
pl_sleep(pp, &mem, &mem.lock, PSWP, pp->pr_wchan, 0);
pl_leave(pp, &mem.lock);
v = mem.v;
}
#ifdef MULTIPROCESSOR
good:
#endif
if (ISSET(flags, PR_ZERO))
memset(v, 0, pp->pr_size);
return (v);
fail:
pp->pr_nfail++;
pl_leave(pp, &pp->pr_lock);
return (NULL);
}
void
pool_get_done(struct pool *pp, void *xmem, void *v)
{
struct pool_get_memory *mem = xmem;
pl_enter(pp, &mem->lock);
mem->v = v;
pl_leave(pp, &mem->lock);
wakeup_one(mem);
}
void
pool_runqueue(struct pool *pp, int flags)
{
struct pool_requests prl = TAILQ_HEAD_INITIALIZER(prl);
struct pool_request *pr;
pl_assert_unlocked(pp, &pp->pr_lock);
pl_assert_locked(pp, &pp->pr_requests_lock);
if (pp->pr_requesting++)
return;
do {
pp->pr_requesting = 1;
/* no TAILQ_JOIN? :( */
while ((pr = TAILQ_FIRST(&pp->pr_requests)) != NULL) {
TAILQ_REMOVE(&pp->pr_requests, pr, pr_entry);
TAILQ_INSERT_TAIL(&prl, pr, pr_entry);
}
if (TAILQ_EMPTY(&prl))
continue;
pl_leave(pp, &pp->pr_requests_lock);
pl_enter(pp, &pp->pr_lock);
pr = TAILQ_FIRST(&prl);
while (pr != NULL) {
int slowdown = 0;
if (pp->pr_nout >= pp->pr_hardlimit)
break;
pr->pr_item = pool_do_get(pp, flags, &slowdown);
if (pr->pr_item == NULL) /* || slowdown ? */
break;
pr = TAILQ_NEXT(pr, pr_entry);
}
pl_leave(pp, &pp->pr_lock);
while ((pr = TAILQ_FIRST(&prl)) != NULL &&
pr->pr_item != NULL) {
TAILQ_REMOVE(&prl, pr, pr_entry);
(*pr->pr_handler)(pp, pr->pr_cookie, pr->pr_item);
}
pl_enter(pp, &pp->pr_requests_lock);
} while (--pp->pr_requesting);
/* no TAILQ_JOIN :( */
while ((pr = TAILQ_FIRST(&prl)) != NULL) {
TAILQ_REMOVE(&prl, pr, pr_entry);
TAILQ_INSERT_TAIL(&pp->pr_requests, pr, pr_entry);
}
}
void *
pool_do_get(struct pool *pp, int flags, int *slowdown)
{
struct pool_item *pi;
struct pool_page_header *ph;
pl_assert_locked(pp, &pp->pr_lock);
splassert(pp->pr_ipl);
/*
* Account for this item now to avoid races if we need to give up
* pr_lock to allocate a page.
*/
pp->pr_nout++;
if (pp->pr_curpage == NULL) {
pl_leave(pp, &pp->pr_lock);
ph = pool_p_alloc(pp, flags, slowdown);
pl_enter(pp, &pp->pr_lock);
if (ph == NULL) {
pp->pr_nout--;
return (NULL);
}
pool_p_insert(pp, ph);
}
ph = pp->pr_curpage;
pi = XSIMPLEQ_FIRST(&ph->ph_items);
if (__predict_false(pi == NULL))
panic("%s: %s: page empty", __func__, pp->pr_wchan);
if (__predict_false(pi->pi_magic != POOL_IMAGIC(ph, pi))) {
panic("%s: %s free list modified: "
"page %p; item addr %p; offset 0x%x=0x%lx != 0x%lx",
__func__, pp->pr_wchan, ph->ph_page, pi,
0, pi->pi_magic, POOL_IMAGIC(ph, pi));
}
XSIMPLEQ_REMOVE_HEAD(&ph->ph_items, pi_list);
#ifdef DIAGNOSTIC
if (pool_debug && POOL_PHPOISON(ph)) {
size_t pidx;
uint32_t pval;
if (poison_check(pi + 1, pp->pr_size - sizeof(*pi),
&pidx, &pval)) {
int *ip = (int *)(pi + 1);
panic("%s: %s free list modified: "
"page %p; item addr %p; offset 0x%zx=0x%x",
__func__, pp->pr_wchan, ph->ph_page, pi,
(pidx * sizeof(int)) + sizeof(*pi), ip[pidx]);
}
}
#endif /* DIAGNOSTIC */
if (ph->ph_nmissing++ == 0) {
/*
* This page was previously empty. Move it to the list of
* partially-full pages. This page is already curpage.
*/
TAILQ_REMOVE(&pp->pr_emptypages, ph, ph_entry);
TAILQ_INSERT_TAIL(&pp->pr_partpages, ph, ph_entry);
pp->pr_nidle--;
}
if (ph->ph_nmissing == pp->pr_itemsperpage) {
/*
* This page is now full. Move it to the full list
* and select a new current page.
*/
TAILQ_REMOVE(&pp->pr_partpages, ph, ph_entry);
TAILQ_INSERT_TAIL(&pp->pr_fullpages, ph, ph_entry);
pool_update_curpage(pp);
}
pp->pr_nget++;
return (pi);
}
/*
* Return resource to the pool.
*/
void
pool_put(struct pool *pp, void *v)
{
struct pool_page_header *ph, *freeph = NULL;
#ifdef DIAGNOSTIC
if (v == NULL)
panic("%s: NULL item", __func__);
#endif
#ifdef MULTIPROCESSOR
if (pp->pr_cache != NULL && TAILQ_EMPTY(&pp->pr_requests)) {
pool_cache_put(pp, v);
return;
}
#endif
pl_enter(pp, &pp->pr_lock);
pool_do_put(pp, v);
pp->pr_nout--;
pp->pr_nput++;
/* is it time to free a page? */
if (pp->pr_nidle > pp->pr_maxpages &&
(ph = TAILQ_FIRST(&pp->pr_emptypages)) != NULL &&
(ticks - ph->ph_tick) > (hz * pool_wait_free)) {
freeph = ph;
pool_p_remove(pp, freeph);
}
pl_leave(pp, &pp->pr_lock);
if (freeph != NULL)
pool_p_free(pp, freeph);
pool_wakeup(pp);
}
void
pool_wakeup(struct pool *pp)
{
if (!TAILQ_EMPTY(&pp->pr_requests)) {
pl_enter(pp, &pp->pr_requests_lock);
pool_runqueue(pp, PR_NOWAIT);
pl_leave(pp, &pp->pr_requests_lock);
}
}
void
pool_do_put(struct pool *pp, void *v)
{
struct pool_item *pi = v;
struct pool_page_header *ph;
splassert(pp->pr_ipl);
ph = pr_find_pagehead(pp, v);
#ifdef DIAGNOSTIC
if (pool_debug) {
struct pool_item *qi;
XSIMPLEQ_FOREACH(qi, &ph->ph_items, pi_list) {
if (pi == qi) {
panic("%s: %s: double pool_put: %p", __func__,
pp->pr_wchan, pi);
}
}
}
#endif /* DIAGNOSTIC */
pi->pi_magic = POOL_IMAGIC(ph, pi);
XSIMPLEQ_INSERT_HEAD(&ph->ph_items, pi, pi_list);
#ifdef DIAGNOSTIC
if (POOL_PHPOISON(ph))
poison_mem(pi + 1, pp->pr_size - sizeof(*pi));
#endif /* DIAGNOSTIC */
if (ph->ph_nmissing-- == pp->pr_itemsperpage) {
/*
* The page was previously completely full, move it to the
* partially-full list.
*/
TAILQ_REMOVE(&pp->pr_fullpages, ph, ph_entry);
TAILQ_INSERT_TAIL(&pp->pr_partpages, ph, ph_entry);
}
if (ph->ph_nmissing == 0) {
/*
* The page is now empty, so move it to the empty page list.
*/
pp->pr_nidle++;
ph->ph_tick = ticks;
TAILQ_REMOVE(&pp->pr_partpages, ph, ph_entry);
TAILQ_INSERT_TAIL(&pp->pr_emptypages, ph, ph_entry);
pool_update_curpage(pp);
}
}
/*
* Add N items to the pool.
*/
int
pool_prime(struct pool *pp, int n)
{
struct pool_pagelist pl = TAILQ_HEAD_INITIALIZER(pl);
struct pool_page_header *ph;
int newpages;
newpages = roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage;
while (newpages-- > 0) {
int slowdown = 0;
ph = pool_p_alloc(pp, PR_NOWAIT, &slowdown);
if (ph == NULL) /* or slowdown? */
break;
TAILQ_INSERT_TAIL(&pl, ph, ph_entry);
}
pl_enter(pp, &pp->pr_lock);
while ((ph = TAILQ_FIRST(&pl)) != NULL) {
TAILQ_REMOVE(&pl, ph, ph_entry);
pool_p_insert(pp, ph);
}
pl_leave(pp, &pp->pr_lock);
return (0);
}
struct pool_page_header *
pool_p_alloc(struct pool *pp, int flags, int *slowdown)
{
struct pool_page_header *ph;
struct pool_item *pi;
caddr_t addr;
unsigned int order;
int o;
int n;
pl_assert_unlocked(pp, &pp->pr_lock);
KASSERT(pp->pr_size >= sizeof(*pi));
addr = pool_allocator_alloc(pp, flags, slowdown);
if (addr == NULL)
return (NULL);
if (POOL_INPGHDR(pp))
ph = (struct pool_page_header *)(addr + pp->pr_phoffset);
else {
ph = pool_get(&phpool, flags);
if (ph == NULL) {
pool_allocator_free(pp, addr);
return (NULL);
}
}
XSIMPLEQ_INIT(&ph->ph_items);
ph->ph_page = addr;
addr += pp->pr_align * (pp->pr_npagealloc % pp->pr_maxcolors);
ph->ph_colored = addr;
ph->ph_nmissing = 0;
arc4random_buf(&ph->ph_magic, sizeof(ph->ph_magic));
#ifdef DIAGNOSTIC
/* use a bit in ph_magic to record if we poison page items */
if (pool_debug)
SET(ph->ph_magic, POOL_MAGICBIT);
else
CLR(ph->ph_magic, POOL_MAGICBIT);
#endif /* DIAGNOSTIC */
n = pp->pr_itemsperpage;
o = 32;
while (n--) {
pi = (struct pool_item *)addr;
pi->pi_magic = POOL_IMAGIC(ph, pi);
if (o == 32) {
order = arc4random();
o = 0;
}
if (ISSET(order, 1 << o++))
XSIMPLEQ_INSERT_TAIL(&ph->ph_items, pi, pi_list);
else
XSIMPLEQ_INSERT_HEAD(&ph->ph_items, pi, pi_list);
#ifdef DIAGNOSTIC
if (POOL_PHPOISON(ph))
poison_mem(pi + 1, pp->pr_size - sizeof(*pi));
#endif /* DIAGNOSTIC */
addr += pp->pr_size;
}
return (ph);
}
void
pool_p_free(struct pool *pp, struct pool_page_header *ph)
{
struct pool_item *pi;
pl_assert_unlocked(pp, &pp->pr_lock);
KASSERT(ph->ph_nmissing == 0);
XSIMPLEQ_FOREACH(pi, &ph->ph_items, pi_list) {
if (__predict_false(pi->pi_magic != POOL_IMAGIC(ph, pi))) {
panic("%s: %s free list modified: "
"page %p; item addr %p; offset 0x%x=0x%lx",
__func__, pp->pr_wchan, ph->ph_page, pi,
0, pi->pi_magic);
}
#ifdef DIAGNOSTIC
if (POOL_PHPOISON(ph)) {
size_t pidx;
uint32_t pval;