version 1.1, 1997/12/15 11:14:57 |
version 1.103, 2005/10/15 21:22:46 |
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/* $NetBSD$ */ |
/* $NetBSD$ */ |
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/*- |
/*- |
* Copyright (c) 1997 The NetBSD Foundation, Inc. |
* Copyright (c) 1997, 1999, 2000 The NetBSD Foundation, Inc. |
* All rights reserved. |
* All rights reserved. |
* |
* |
* This code is derived from software contributed to The NetBSD Foundation |
* This code is derived from software contributed to The NetBSD Foundation |
* by Paul Kranenburg. |
* by Paul Kranenburg; by Jason R. Thorpe of the Numerical Aerospace |
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* Simulation Facility, NASA Ames Research Center. |
* |
* |
* Redistribution and use in source and binary forms, with or without |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* modification, are permitted provided that the following conditions |
|
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* documentation and/or other materials provided with the distribution. |
* documentation and/or other materials provided with the distribution. |
* 3. All advertising materials mentioning features or use of this software |
* 3. All advertising materials mentioning features or use of this software |
* must display the following acknowledgement: |
* must display the following acknowledgement: |
* This product includes software developed by the NetBSD |
* This product includes software developed by the NetBSD |
* Foundation, Inc. and its contributors. |
* Foundation, Inc. and its contributors. |
* 4. Neither the name of The NetBSD Foundation nor the names of its |
* 4. Neither the name of The NetBSD Foundation nor the names of its |
* contributors may be used to endorse or promote products derived |
* contributors may be used to endorse or promote products derived |
* from this software without specific prior written permission. |
* from this software without specific prior written permission. |
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* POSSIBILITY OF SUCH DAMAGE. |
* POSSIBILITY OF SUCH DAMAGE. |
*/ |
*/ |
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#include <sys/cdefs.h> |
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__KERNEL_RCSID(0, "$NetBSD$"); |
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#include "opt_pool.h" |
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#include "opt_poollog.h" |
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#include "opt_lockdebug.h" |
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#include <sys/param.h> |
#include <sys/param.h> |
#include <sys/systm.h> |
#include <sys/systm.h> |
#include <sys/proc.h> |
#include <sys/proc.h> |
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#include <sys/malloc.h> |
#include <sys/malloc.h> |
#include <sys/lock.h> |
#include <sys/lock.h> |
#include <sys/pool.h> |
#include <sys/pool.h> |
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#include <sys/syslog.h> |
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#include <uvm/uvm.h> |
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/* |
/* |
* Pool resource management utility. |
* Pool resource management utility. |
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* |
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* Memory is allocated in pages which are split into pieces according to |
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* the pool item size. Each page is kept on one of three lists in the |
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* pool structure: `pr_emptypages', `pr_fullpages' and `pr_partpages', |
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* for empty, full and partially-full pages respectively. The individual |
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* pool items are on a linked list headed by `ph_itemlist' in each page |
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* header. The memory for building the page list is either taken from |
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* the allocated pages themselves (for small pool items) or taken from |
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* an internal pool of page headers (`phpool'). |
*/ |
*/ |
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/* List of all pools */ |
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LIST_HEAD(,pool) pool_head = LIST_HEAD_INITIALIZER(pool_head); |
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/* Private pool for page header structures */ |
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#define PHPOOL_MAX 8 |
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static struct pool phpool[PHPOOL_MAX]; |
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#define PHPOOL_FREELIST_NELEM(idx) (((idx) == 0) ? 0 : (1 << (idx))) |
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#ifdef POOL_SUBPAGE |
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/* Pool of subpages for use by normal pools. */ |
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static struct pool psppool; |
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#endif |
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static void *pool_page_alloc_meta(struct pool *, int); |
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static void pool_page_free_meta(struct pool *, void *); |
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/* allocator for pool metadata */ |
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static struct pool_allocator pool_allocator_meta = { |
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pool_page_alloc_meta, pool_page_free_meta |
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}; |
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/* # of seconds to retain page after last use */ |
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int pool_inactive_time = 10; |
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/* Next candidate for drainage (see pool_drain()) */ |
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static struct pool *drainpp; |
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/* This spin lock protects both pool_head and drainpp. */ |
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struct simplelock pool_head_slock = SIMPLELOCK_INITIALIZER; |
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typedef uint8_t pool_item_freelist_t; |
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struct pool_item_header { |
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/* Page headers */ |
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LIST_ENTRY(pool_item_header) |
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ph_pagelist; /* pool page list */ |
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SPLAY_ENTRY(pool_item_header) |
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ph_node; /* Off-page page headers */ |
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caddr_t ph_page; /* this page's address */ |
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struct timeval ph_time; /* last referenced */ |
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union { |
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/* !PR_NOTOUCH */ |
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struct { |
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LIST_HEAD(, pool_item) |
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phu_itemlist; /* chunk list for this page */ |
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} phu_normal; |
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/* PR_NOTOUCH */ |
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struct { |
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uint16_t |
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phu_off; /* start offset in page */ |
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pool_item_freelist_t |
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phu_firstfree; /* first free item */ |
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/* |
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* XXX it might be better to use |
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* a simple bitmap and ffs(3) |
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*/ |
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} phu_notouch; |
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} ph_u; |
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uint16_t ph_nmissing; /* # of chunks in use */ |
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}; |
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#define ph_itemlist ph_u.phu_normal.phu_itemlist |
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#define ph_off ph_u.phu_notouch.phu_off |
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#define ph_firstfree ph_u.phu_notouch.phu_firstfree |
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struct pool_item { |
struct pool_item { |
struct pool_item *pi_next; |
#ifdef DIAGNOSTIC |
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u_int pi_magic; |
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#endif |
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#define PI_MAGIC 0xdeadbeefU |
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/* Other entries use only this list entry */ |
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LIST_ENTRY(pool_item) pi_list; |
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}; |
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#define POOL_NEEDS_CATCHUP(pp) \ |
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((pp)->pr_nitems < (pp)->pr_minitems) |
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/* |
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* Pool cache management. |
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* |
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* Pool caches provide a way for constructed objects to be cached by the |
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* pool subsystem. This can lead to performance improvements by avoiding |
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* needless object construction/destruction; it is deferred until absolutely |
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* necessary. |
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* |
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* Caches are grouped into cache groups. Each cache group references |
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* up to 16 constructed objects. When a cache allocates an object |
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* from the pool, it calls the object's constructor and places it into |
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* a cache group. When a cache group frees an object back to the pool, |
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* it first calls the object's destructor. This allows the object to |
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* persist in constructed form while freed to the cache. |
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* |
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* Multiple caches may exist for each pool. This allows a single |
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* object type to have multiple constructed forms. The pool references |
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* each cache, so that when a pool is drained by the pagedaemon, it can |
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* drain each individual cache as well. Each time a cache is drained, |
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* the most idle cache group is freed to the pool in its entirety. |
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* |
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* Pool caches are layed on top of pools. By layering them, we can avoid |
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* the complexity of cache management for pools which would not benefit |
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* from it. |
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*/ |
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/* The cache group pool. */ |
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static struct pool pcgpool; |
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static void pool_cache_reclaim(struct pool_cache *, struct pool_pagelist *, |
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struct pool_cache_grouplist *); |
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static void pcg_grouplist_free(struct pool_cache_grouplist *); |
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static int pool_catchup(struct pool *); |
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static void pool_prime_page(struct pool *, caddr_t, |
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struct pool_item_header *); |
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static void pool_update_curpage(struct pool *); |
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void *pool_allocator_alloc(struct pool *, int); |
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void pool_allocator_free(struct pool *, void *); |
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static void pool_print_pagelist(struct pool *, struct pool_pagelist *, |
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void (*)(const char *, ...)); |
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static void pool_print1(struct pool *, const char *, |
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void (*)(const char *, ...)); |
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static int pool_chk_page(struct pool *, const char *, |
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struct pool_item_header *); |
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/* |
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* Pool log entry. An array of these is allocated in pool_init(). |
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*/ |
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struct pool_log { |
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const char *pl_file; |
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long pl_line; |
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int pl_action; |
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#define PRLOG_GET 1 |
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#define PRLOG_PUT 2 |
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void *pl_addr; |
}; |
}; |
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#ifdef POOL_DIAGNOSTIC |
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/* Number of entries in pool log buffers */ |
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#ifndef POOL_LOGSIZE |
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#define POOL_LOGSIZE 10 |
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#endif |
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int pool_logsize = POOL_LOGSIZE; |
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struct pool * |
static __inline void |
pool_create(size, nitems, wchan, mtype) |
pr_log(struct pool *pp, void *v, int action, const char *file, long line) |
size_t size; |
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int nitems; |
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char *wchan; |
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int mtype; |
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{ |
{ |
struct pool *pp; |
int n = pp->pr_curlogentry; |
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struct pool_log *pl; |
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if (size < sizeof(struct pool_item)) { |
if ((pp->pr_roflags & PR_LOGGING) == 0) |
printf("pool_create: size %lu too small\n", (u_long)size); |
return; |
return (NULL); |
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/* |
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* Fill in the current entry. Wrap around and overwrite |
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* the oldest entry if necessary. |
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*/ |
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pl = &pp->pr_log[n]; |
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pl->pl_file = file; |
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pl->pl_line = line; |
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pl->pl_action = action; |
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pl->pl_addr = v; |
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if (++n >= pp->pr_logsize) |
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n = 0; |
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pp->pr_curlogentry = n; |
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} |
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static void |
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pr_printlog(struct pool *pp, struct pool_item *pi, |
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void (*pr)(const char *, ...)) |
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{ |
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int i = pp->pr_logsize; |
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int n = pp->pr_curlogentry; |
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if ((pp->pr_roflags & PR_LOGGING) == 0) |
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return; |
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/* |
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* Print all entries in this pool's log. |
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*/ |
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while (i-- > 0) { |
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struct pool_log *pl = &pp->pr_log[n]; |
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if (pl->pl_action != 0) { |
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if (pi == NULL || pi == pl->pl_addr) { |
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(*pr)("\tlog entry %d:\n", i); |
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(*pr)("\t\taction = %s, addr = %p\n", |
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pl->pl_action == PRLOG_GET ? "get" : "put", |
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pl->pl_addr); |
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(*pr)("\t\tfile: %s at line %lu\n", |
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pl->pl_file, pl->pl_line); |
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} |
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} |
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if (++n >= pp->pr_logsize) |
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n = 0; |
} |
} |
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} |
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pp = (struct pool *)malloc(sizeof(*pp), mtype, M_NOWAIT); |
static __inline void |
if (pp == NULL) |
pr_enter(struct pool *pp, const char *file, long line) |
return (NULL); |
{ |
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pp->pr_freelist = NULL; |
if (__predict_false(pp->pr_entered_file != NULL)) { |
pp->pr_freecount = 0; |
printf("pool %s: reentrancy at file %s line %ld\n", |
pp->pr_hiwat = 0; |
pp->pr_wchan, file, line); |
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printf(" previous entry at file %s line %ld\n", |
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pp->pr_entered_file, pp->pr_entered_line); |
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panic("pr_enter"); |
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} |
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pp->pr_entered_file = file; |
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pp->pr_entered_line = line; |
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} |
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static __inline void |
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pr_leave(struct pool *pp) |
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{ |
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if (__predict_false(pp->pr_entered_file == NULL)) { |
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printf("pool %s not entered?\n", pp->pr_wchan); |
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panic("pr_leave"); |
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} |
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pp->pr_entered_file = NULL; |
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pp->pr_entered_line = 0; |
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} |
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static __inline void |
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pr_enter_check(struct pool *pp, void (*pr)(const char *, ...)) |
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{ |
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if (pp->pr_entered_file != NULL) |
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(*pr)("\n\tcurrently entered from file %s line %ld\n", |
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pp->pr_entered_file, pp->pr_entered_line); |
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} |
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#else |
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#define pr_log(pp, v, action, file, line) |
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#define pr_printlog(pp, pi, pr) |
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#define pr_enter(pp, file, line) |
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#define pr_leave(pp) |
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#define pr_enter_check(pp, pr) |
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#endif /* POOL_DIAGNOSTIC */ |
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static __inline int |
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pr_item_notouch_index(const struct pool *pp, const struct pool_item_header *ph, |
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const void *v) |
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{ |
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const char *cp = v; |
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int idx; |
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KASSERT(pp->pr_roflags & PR_NOTOUCH); |
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idx = (cp - ph->ph_page - ph->ph_off) / pp->pr_size; |
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KASSERT(idx < pp->pr_itemsperpage); |
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return idx; |
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} |
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#define PR_FREELIST_ALIGN(p) \ |
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roundup((uintptr_t)(p), sizeof(pool_item_freelist_t)) |
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#define PR_FREELIST(ph) ((pool_item_freelist_t *)PR_FREELIST_ALIGN((ph) + 1)) |
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#define PR_INDEX_USED ((pool_item_freelist_t)-1) |
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#define PR_INDEX_EOL ((pool_item_freelist_t)-2) |
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static __inline void |
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pr_item_notouch_put(const struct pool *pp, struct pool_item_header *ph, |
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void *obj) |
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{ |
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int idx = pr_item_notouch_index(pp, ph, obj); |
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pool_item_freelist_t *freelist = PR_FREELIST(ph); |
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KASSERT(freelist[idx] == PR_INDEX_USED); |
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freelist[idx] = ph->ph_firstfree; |
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ph->ph_firstfree = idx; |
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} |
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static __inline void * |
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pr_item_notouch_get(const struct pool *pp, struct pool_item_header *ph) |
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{ |
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int idx = ph->ph_firstfree; |
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pool_item_freelist_t *freelist = PR_FREELIST(ph); |
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KASSERT(freelist[idx] != PR_INDEX_USED); |
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ph->ph_firstfree = freelist[idx]; |
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freelist[idx] = PR_INDEX_USED; |
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return ph->ph_page + ph->ph_off + idx * pp->pr_size; |
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} |
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static __inline int |
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phtree_compare(struct pool_item_header *a, struct pool_item_header *b) |
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{ |
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if (a->ph_page < b->ph_page) |
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return (-1); |
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else if (a->ph_page > b->ph_page) |
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return (1); |
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else |
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return (0); |
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} |
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SPLAY_PROTOTYPE(phtree, pool_item_header, ph_node, phtree_compare); |
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SPLAY_GENERATE(phtree, pool_item_header, ph_node, phtree_compare); |
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/* |
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* Return the pool page header based on page address. |
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*/ |
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static __inline struct pool_item_header * |
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pr_find_pagehead(struct pool *pp, caddr_t page) |
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{ |
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struct pool_item_header *ph, tmp; |
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if ((pp->pr_roflags & PR_PHINPAGE) != 0) |
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return ((struct pool_item_header *)(page + pp->pr_phoffset)); |
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tmp.ph_page = page; |
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ph = SPLAY_FIND(phtree, &pp->pr_phtree, &tmp); |
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return ph; |
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} |
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static void |
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pr_pagelist_free(struct pool *pp, struct pool_pagelist *pq) |
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{ |
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struct pool_item_header *ph; |
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int s; |
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while ((ph = LIST_FIRST(pq)) != NULL) { |
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LIST_REMOVE(ph, ph_pagelist); |
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pool_allocator_free(pp, ph->ph_page); |
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if ((pp->pr_roflags & PR_PHINPAGE) == 0) { |
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s = splvm(); |
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pool_put(pp->pr_phpool, ph); |
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splx(s); |
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} |
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} |
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} |
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/* |
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* Remove a page from the pool. |
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*/ |
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static __inline void |
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pr_rmpage(struct pool *pp, struct pool_item_header *ph, |
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struct pool_pagelist *pq) |
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{ |
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LOCK_ASSERT(simple_lock_held(&pp->pr_slock)); |
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/* |
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* If the page was idle, decrement the idle page count. |
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*/ |
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if (ph->ph_nmissing == 0) { |
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#ifdef DIAGNOSTIC |
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if (pp->pr_nidle == 0) |
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panic("pr_rmpage: nidle inconsistent"); |
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if (pp->pr_nitems < pp->pr_itemsperpage) |
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panic("pr_rmpage: nitems inconsistent"); |
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#endif |
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pp->pr_nidle--; |
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} |
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pp->pr_nitems -= pp->pr_itemsperpage; |
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/* |
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* Unlink the page from the pool and queue it for release. |
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*/ |
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LIST_REMOVE(ph, ph_pagelist); |
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if ((pp->pr_roflags & PR_PHINPAGE) == 0) |
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SPLAY_REMOVE(phtree, &pp->pr_phtree, ph); |
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LIST_INSERT_HEAD(pq, ph, ph_pagelist); |
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pp->pr_npages--; |
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pp->pr_npagefree++; |
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pool_update_curpage(pp); |
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} |
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/* |
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* Initialize all the pools listed in the "pools" link set. |
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*/ |
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void |
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link_pool_init(void) |
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{ |
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__link_set_decl(pools, struct link_pool_init); |
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struct link_pool_init * const *pi; |
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__link_set_foreach(pi, pools) |
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pool_init((*pi)->pp, (*pi)->size, (*pi)->align, |
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(*pi)->align_offset, (*pi)->flags, (*pi)->wchan, |
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(*pi)->palloc); |
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} |
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/* |
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* Initialize the given pool resource structure. |
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* |
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* We export this routine to allow other kernel parts to declare |
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* static pools that must be initialized before malloc() is available. |
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*/ |
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void |
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pool_init(struct pool *pp, size_t size, u_int align, u_int ioff, int flags, |
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const char *wchan, struct pool_allocator *palloc) |
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{ |
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int off, slack; |
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size_t trysize, phsize; |
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int s; |
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KASSERT((1UL << (CHAR_BIT * sizeof(pool_item_freelist_t))) - 2 >= |
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PHPOOL_FREELIST_NELEM(PHPOOL_MAX - 1)); |
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#ifdef POOL_DIAGNOSTIC |
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/* |
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* Always log if POOL_DIAGNOSTIC is defined. |
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*/ |
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if (pool_logsize != 0) |
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flags |= PR_LOGGING; |
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#endif |
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#ifdef POOL_SUBPAGE |
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/* |
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* XXX We don't provide a real `nointr' back-end |
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* yet; all sub-pages come from a kmem back-end. |
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* maybe some day... |
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*/ |
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if (palloc == NULL) { |
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extern struct pool_allocator pool_allocator_kmem_subpage; |
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palloc = &pool_allocator_kmem_subpage; |
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} |
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/* |
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* We'll assume any user-specified back-end allocator |
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* will deal with sub-pages, or simply don't care. |
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*/ |
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#else |
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if (palloc == NULL) |
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palloc = &pool_allocator_kmem; |
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#endif /* POOL_SUBPAGE */ |
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if ((palloc->pa_flags & PA_INITIALIZED) == 0) { |
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if (palloc->pa_pagesz == 0) { |
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#ifdef POOL_SUBPAGE |
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if (palloc == &pool_allocator_kmem) |
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palloc->pa_pagesz = PAGE_SIZE; |
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else |
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palloc->pa_pagesz = POOL_SUBPAGE; |
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#else |
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palloc->pa_pagesz = PAGE_SIZE; |
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#endif /* POOL_SUBPAGE */ |
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} |
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|
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TAILQ_INIT(&palloc->pa_list); |
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|
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simple_lock_init(&palloc->pa_slock); |
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palloc->pa_pagemask = ~(palloc->pa_pagesz - 1); |
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palloc->pa_pageshift = ffs(palloc->pa_pagesz) - 1; |
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palloc->pa_flags |= PA_INITIALIZED; |
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} |
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|
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if (align == 0) |
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align = ALIGN(1); |
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|
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if (size < sizeof(struct pool_item)) |
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size = sizeof(struct pool_item); |
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|
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size = roundup(size, align); |
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#ifdef DIAGNOSTIC |
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if (size > palloc->pa_pagesz) |
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panic("pool_init: pool item size (%lu) too large", |
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(u_long)size); |
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#endif |
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|
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/* |
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* Initialize the pool structure. |
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*/ |
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LIST_INIT(&pp->pr_emptypages); |
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LIST_INIT(&pp->pr_fullpages); |
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LIST_INIT(&pp->pr_partpages); |
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LIST_INIT(&pp->pr_cachelist); |
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pp->pr_curpage = NULL; |
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pp->pr_npages = 0; |
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pp->pr_minitems = 0; |
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pp->pr_minpages = 0; |
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pp->pr_maxpages = UINT_MAX; |
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pp->pr_roflags = flags; |
pp->pr_flags = 0; |
pp->pr_flags = 0; |
pp->pr_size = size; |
pp->pr_size = size; |
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pp->pr_align = align; |
pp->pr_wchan = wchan; |
pp->pr_wchan = wchan; |
pp->pr_mtype = mtype; |
pp->pr_alloc = palloc; |
simple_lock_init(&pp->pr_lock); |
pp->pr_nitems = 0; |
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pp->pr_nout = 0; |
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pp->pr_hardlimit = UINT_MAX; |
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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; |
|
|
|
/* |
|
* 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) == 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); |
|
} |
|
|
if (nitems != 0) { |
/* |
if (pool_prime(pp, nitems) != 0) |
* Alignment is to take place at `ioff' within the item. This means |
pool_destroy(pp); |
* we must reserve up to `align - 1' bytes on the page to allow |
return (NULL); |
* 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; |
|
|
|
#ifdef POOL_DIAGNOSTIC |
|
if (flags & PR_LOGGING) { |
|
if (kmem_map == NULL || |
|
(pp->pr_log = malloc(pool_logsize * sizeof(struct pool_log), |
|
M_TEMP, M_NOWAIT)) == NULL) |
|
pp->pr_roflags &= ~PR_LOGGING; |
|
pp->pr_curlogentry = 0; |
|
pp->pr_logsize = pool_logsize; |
|
} |
|
#endif |
|
|
|
pp->pr_entered_file = NULL; |
|
pp->pr_entered_line = 0; |
|
|
|
simple_lock_init(&pp->pr_slock); |
|
|
|
/* |
|
* Initialize private page header pool and cache magazine pool if we |
|
* haven't done so yet. |
|
* XXX LOCKING. |
|
*/ |
|
if (phpool[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 = PR_FREELIST_ALIGN(sz) |
|
+ nelem * sizeof(pool_item_freelist_t); |
|
} |
|
pool_init(&phpool[idx], sz, 0, 0, 0, |
|
phpool_names[idx], &pool_allocator_meta); |
|
} |
|
#ifdef POOL_SUBPAGE |
|
pool_init(&psppool, POOL_SUBPAGE, POOL_SUBPAGE, 0, |
|
PR_RECURSIVE, "psppool", &pool_allocator_meta); |
|
#endif |
|
pool_init(&pcgpool, sizeof(struct pool_cache_group), 0, 0, |
|
0, "pcgpool", &pool_allocator_meta); |
} |
} |
|
|
return (pp); |
/* Insert into the list of all pools. */ |
|
simple_lock(&pool_head_slock); |
|
LIST_INSERT_HEAD(&pool_head, pp, pr_poollist); |
|
simple_unlock(&pool_head_slock); |
|
|
|
/* Insert this into the list of pools using this allocator. */ |
|
s = splvm(); |
|
simple_lock(&palloc->pa_slock); |
|
TAILQ_INSERT_TAIL(&palloc->pa_list, pp, pr_alloc_list); |
|
simple_unlock(&palloc->pa_slock); |
|
splx(s); |
} |
} |
|
|
/* |
/* |
* De-commision a pool resource. |
* De-commision a pool resource. |
*/ |
*/ |
void |
void |
pool_destroy(pp) |
pool_destroy(struct pool *pp) |
struct pool *pp; |
|
{ |
{ |
struct pool_item *pi; |
struct pool_pagelist pq; |
|
struct pool_item_header *ph; |
while ((pi = pp->pr_freelist) != NULL) { |
int s; |
pp->pr_freelist = pi->pi_next; |
|
free(pi, pp->pr_mtype); |
/* Remove from global pool list */ |
|
simple_lock(&pool_head_slock); |
|
LIST_REMOVE(pp, pr_poollist); |
|
if (drainpp == pp) |
|
drainpp = NULL; |
|
simple_unlock(&pool_head_slock); |
|
|
|
/* Remove this pool from its allocator's list of pools. */ |
|
s = splvm(); |
|
simple_lock(&pp->pr_alloc->pa_slock); |
|
TAILQ_REMOVE(&pp->pr_alloc->pa_list, pp, pr_alloc_list); |
|
simple_unlock(&pp->pr_alloc->pa_slock); |
|
splx(s); |
|
|
|
s = splvm(); |
|
simple_lock(&pp->pr_slock); |
|
|
|
KASSERT(LIST_EMPTY(&pp->pr_cachelist)); |
|
|
|
#ifdef DIAGNOSTIC |
|
if (pp->pr_nout != 0) { |
|
pr_printlog(pp, NULL, printf); |
|
panic("pool_destroy: pool busy: still out: %u", |
|
pp->pr_nout); |
} |
} |
free(pp, pp->pr_mtype); |
#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); |
|
|
|
simple_unlock(&pp->pr_slock); |
|
splx(s); |
|
|
|
pr_pagelist_free(pp, &pq); |
|
|
|
#ifdef POOL_DIAGNOSTIC |
|
if ((pp->pr_roflags & PR_LOGGING) != 0) |
|
free(pp->pr_log, M_TEMP); |
|
#endif |
|
} |
|
|
|
void |
|
pool_set_drain_hook(struct pool *pp, void (*fn)(void *, int), void *arg) |
|
{ |
|
|
|
/* XXX no locking -- must be used just after pool_init() */ |
|
#ifdef DIAGNOSTIC |
|
if (pp->pr_drain_hook != NULL) |
|
panic("pool_set_drain_hook(%s): already set", pp->pr_wchan); |
|
#endif |
|
pp->pr_drain_hook = fn; |
|
pp->pr_drain_hook_arg = arg; |
} |
} |
|
|
|
static struct pool_item_header * |
|
pool_alloc_item_header(struct pool *pp, caddr_t storage, int flags) |
|
{ |
|
struct pool_item_header *ph; |
|
int s; |
|
|
|
LOCK_ASSERT(simple_lock_held(&pp->pr_slock) == 0); |
|
|
|
if ((pp->pr_roflags & PR_PHINPAGE) != 0) |
|
ph = (struct pool_item_header *) (storage + pp->pr_phoffset); |
|
else { |
|
s = splvm(); |
|
ph = pool_get(pp->pr_phpool, flags); |
|
splx(s); |
|
} |
|
|
|
return (ph); |
|
} |
|
|
/* |
/* |
* Grab an item from the pool; must be called at splbio |
* Grab an item from the pool; must be called at appropriate spl level |
*/ |
*/ |
void * |
void * |
pool_get(pp, flags) |
#ifdef POOL_DIAGNOSTIC |
struct pool *pp; |
_pool_get(struct pool *pp, int flags, const char *file, long line) |
int flags; |
#else |
|
pool_get(struct pool *pp, int flags) |
|
#endif |
{ |
{ |
void *v; |
|
struct pool_item *pi; |
struct pool_item *pi; |
|
struct pool_item_header *ph; |
|
void *v; |
|
|
|
#ifdef DIAGNOSTIC |
|
if (__predict_false(pp->pr_itemsperpage == 0)) |
|
panic("pool_get: pool %p: pr_itemsperpage is zero, " |
|
"pool not initialized?", pp); |
|
if (__predict_false(curlwp == NULL && doing_shutdown == 0 && |
|
(flags & PR_WAITOK) != 0)) |
|
panic("pool_get: %s: must have NOWAIT", pp->pr_wchan); |
|
|
|
#endif /* DIAGNOSTIC */ |
|
#ifdef LOCKDEBUG |
|
if (flags & PR_WAITOK) |
|
simple_lock_only_held(NULL, "pool_get(PR_WAITOK)"); |
|
SCHED_ASSERT_UNLOCKED(); |
|
#endif |
|
|
|
simple_lock(&pp->pr_slock); |
|
pr_enter(pp, file, line); |
|
|
|
startover: |
|
/* |
|
* Check to see if we've reached the hard limit. If we have, |
|
* and we can wait, then wait until an item has been returned to |
|
* the pool. |
|
*/ |
|
#ifdef DIAGNOSTIC |
|
if (__predict_false(pp->pr_nout > pp->pr_hardlimit)) { |
|
pr_leave(pp); |
|
simple_unlock(&pp->pr_slock); |
|
panic("pool_get: %s: crossed hard limit", pp->pr_wchan); |
|
} |
|
#endif |
|
if (__predict_false(pp->pr_nout == pp->pr_hardlimit)) { |
|
if (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); |
|
simple_unlock(&pp->pr_slock); |
|
(*pp->pr_drain_hook)(pp->pr_drain_hook_arg, flags); |
|
simple_lock(&pp->pr_slock); |
|
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); |
|
ltsleep(pp, PSWP, pp->pr_wchan, 0, &pp->pr_slock); |
|
pr_enter(pp, file, line); |
|
goto startover; |
|
} |
|
|
|
/* |
|
* Log a message that the hard limit has been hit. |
|
*/ |
|
if (pp->pr_hardlimit_warning != NULL && |
|
ratecheck(&pp->pr_hardlimit_warning_last, |
|
&pp->pr_hardlimit_ratecap)) |
|
log(LOG_ERR, "%s\n", pp->pr_hardlimit_warning); |
|
|
|
pp->pr_nfail++; |
|
|
|
pr_leave(pp); |
|
simple_unlock(&pp->pr_slock); |
|
return (NULL); |
|
} |
|
|
again: |
/* |
simple_lock(&pp->pr_lock); |
* The convention we use is that if `curpage' is not NULL, then |
if ((v = pp->pr_freelist) == NULL) { |
* it points at a non-empty bucket. In particular, `curpage' |
if (flags & PR_MALLOCOK) |
* never points at a page header which has PR_PHINPAGE set and |
v = (void *)malloc(pp->pr_size, pp->pr_mtype, M_NOWAIT); |
* has no items in its bucket. |
|
*/ |
|
if ((ph = pp->pr_curpage) == NULL) { |
|
#ifdef DIAGNOSTIC |
|
if (pp->pr_nitems != 0) { |
|
simple_unlock(&pp->pr_slock); |
|
printf("pool_get: %s: curpage NULL, nitems %u\n", |
|
pp->pr_wchan, pp->pr_nitems); |
|
panic("pool_get: nitems inconsistent"); |
|
} |
|
#endif |
|
|
if (v == NULL) { |
/* |
if ((flags & PR_WAITOK) == 0) |
* Call the back-end page allocator for more memory. |
|
* Release the pool lock, as the back-end page allocator |
|
* may block. |
|
*/ |
|
pr_leave(pp); |
|
simple_unlock(&pp->pr_slock); |
|
v = pool_allocator_alloc(pp, flags); |
|
if (__predict_true(v != NULL)) |
|
ph = pool_alloc_item_header(pp, v, flags); |
|
|
|
if (__predict_false(v == NULL || ph == NULL)) { |
|
if (v != NULL) |
|
pool_allocator_free(pp, v); |
|
|
|
simple_lock(&pp->pr_slock); |
|
pr_enter(pp, file, line); |
|
|
|
/* |
|
* We were unable to allocate a page or item |
|
* header, but we released the lock during |
|
* allocation, so perhaps items were freed |
|
* back to the pool. Check for this case. |
|
*/ |
|
if (pp->pr_curpage != NULL) |
|
goto startover; |
|
|
|
if ((flags & PR_WAITOK) == 0) { |
|
pp->pr_nfail++; |
|
pr_leave(pp); |
|
simple_unlock(&pp->pr_slock); |
return (NULL); |
return (NULL); |
|
} |
|
|
|
/* |
|
* Wait for items to be returned to this pool. |
|
* |
|
* XXX: maybe we should wake up once a second and |
|
* try again? |
|
*/ |
pp->pr_flags |= PR_WANTED; |
pp->pr_flags |= PR_WANTED; |
simple_unlock(&pp->pr_lock); |
/* PA_WANTED is already set on the allocator. */ |
tsleep((caddr_t)pp, PSWP, pp->pr_wchan, 0); |
pr_leave(pp); |
goto again; |
ltsleep(pp, PSWP, pp->pr_wchan, 0, &pp->pr_slock); |
|
pr_enter(pp, file, line); |
|
goto startover; |
|
} |
|
|
|
/* We have more memory; add it to the pool */ |
|
simple_lock(&pp->pr_slock); |
|
pr_enter(pp, file, line); |
|
pool_prime_page(pp, v, ph); |
|
pp->pr_npagealloc++; |
|
|
|
/* 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); |
|
simple_unlock(&pp->pr_slock); |
|
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 { |
} else { |
pi = v; |
v = pi = LIST_FIRST(&ph->ph_itemlist); |
pp->pr_freelist = pi->pi_next; |
if (__predict_false(v == NULL)) { |
pp->pr_freecount--; |
pr_leave(pp); |
|
simple_unlock(&pp->pr_slock); |
|
panic("pool_get: %s: page empty", pp->pr_wchan); |
|
} |
|
#ifdef DIAGNOSTIC |
|
if (__predict_false(pp->pr_nitems == 0)) { |
|
pr_leave(pp); |
|
simple_unlock(&pp->pr_slock); |
|
printf("pool_get: %s: items on itemlist, nitems %u\n", |
|
pp->pr_wchan, pp->pr_nitems); |
|
panic("pool_get: nitems inconsistent"); |
|
} |
|
#endif |
|
|
|
#ifdef POOL_DIAGNOSTIC |
|
pr_log(pp, v, PRLOG_GET, file, line); |
|
#endif |
|
|
|
#ifdef DIAGNOSTIC |
|
if (__predict_false(pi->pi_magic != PI_MAGIC)) { |
|
pr_printlog(pp, pi, printf); |
|
panic("pool_get(%s): free list modified: " |
|
"magic=%x; page %p; item addr %p\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); |
|
simple_unlock(&pp->pr_slock); |
|
panic("pool_get: %s: nmissing inconsistent", |
|
pp->pr_wchan); |
|
} |
|
#endif |
|
/* |
|
* This page is now full. Move it to the full list |
|
* and select a new current page. |
|
*/ |
|
LIST_REMOVE(ph, ph_pagelist); |
|
LIST_INSERT_HEAD(&pp->pr_fullpages, ph, ph_pagelist); |
|
pool_update_curpage(pp); |
|
} |
|
|
|
pp->pr_nget++; |
|
|
|
/* |
|
* If we have a low water mark and we are now below that low |
|
* water mark, add more items to the pool. |
|
*/ |
|
if (POOL_NEEDS_CATCHUP(pp) && pool_catchup(pp) != 0) { |
|
/* |
|
* XXX: Should we log a warning? Should we set up a timeout |
|
* to try again in a second or so? The latter could break |
|
* a caller's assumptions about interrupt protection, etc. |
|
*/ |
} |
} |
simple_unlock(&pp->pr_lock); |
|
|
pr_leave(pp); |
|
simple_unlock(&pp->pr_slock); |
return (v); |
return (v); |
} |
} |
|
|
/* |
/* |
* Return resource to the pool; must be called at splbio |
* Internal version of pool_put(). Pool is already locked/entered. |
*/ |
*/ |
void |
static void |
pool_put(pp, v) |
pool_do_put(struct pool *pp, void *v, struct pool_pagelist *pq) |
struct pool *pp; |
|
void *v; |
|
{ |
{ |
struct pool_item *pi = v; |
struct pool_item *pi = v; |
|
struct pool_item_header *ph; |
|
caddr_t page; |
|
int s; |
|
|
|
LOCK_ASSERT(simple_lock_held(&pp->pr_slock)); |
|
SCHED_ASSERT_UNLOCKED(); |
|
|
|
page = (caddr_t)((u_long)v & pp->pr_alloc->pa_pagemask); |
|
|
|
#ifdef DIAGNOSTIC |
|
if (__predict_false(pp->pr_nout == 0)) { |
|
printf("pool %s: putting with none out\n", |
|
pp->pr_wchan); |
|
panic("pool_put"); |
|
} |
|
#endif |
|
|
simple_lock(&pp->pr_lock); |
if (__predict_false((ph = pr_find_pagehead(pp, page)) == NULL)) { |
if ((pp->pr_flags & PR_WANTED) || pp->pr_freecount < pp->pr_hiwat) { |
pr_printlog(pp, NULL, printf); |
/* Return to pool */ |
panic("pool_put: %s: page header missing", pp->pr_wchan); |
pi->pi_next = pp->pr_freelist; |
} |
pp->pr_freelist = pi; |
|
pp->pr_freecount++; |
#ifdef LOCKDEBUG |
if (pp->pr_flags & PR_WANTED) { |
/* |
pp->pr_flags &= ~PR_WANTED; |
* Check if we're freeing a locked simple lock. |
wakeup((caddr_t)pp); |
*/ |
} |
simple_lock_freecheck((caddr_t)pi, ((caddr_t)pi) + pp->pr_size); |
|
#endif |
|
|
|
/* |
|
* Return to item list. |
|
*/ |
|
if (pp->pr_roflags & PR_NOTOUCH) { |
|
pr_item_notouch_put(pp, ph, v); |
} else { |
} else { |
/* Return to system */ |
#ifdef DIAGNOSTIC |
free(v, M_DEVBUF); |
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); |
* Return any excess items allocated during periods of |
} |
* contention. |
KDASSERT(ph->ph_nmissing != 0); |
*/ |
ph->ph_nmissing--; |
while (pp->pr_freecount > pp->pr_hiwat) { |
pp->pr_nput++; |
pi = pp->pr_freelist; |
pp->pr_nitems++; |
pp->pr_freelist = pi->pi_next; |
pp->pr_nout--; |
pp->pr_freecount--; |
|
free(pi, M_DEVBUF); |
/* Cancel "pool empty" condition if it exists */ |
|
if (pp->pr_curpage == NULL) |
|
pp->pr_curpage = ph; |
|
|
|
if (pp->pr_flags & PR_WANTED) { |
|
pp->pr_flags &= ~PR_WANTED; |
|
if (ph->ph_nmissing == 0) |
|
pp->pr_nidle++; |
|
wakeup((caddr_t)pp); |
|
return; |
|
} |
|
|
|
/* |
|
* If this page is now empty, do one of two things: |
|
* |
|
* (1) If we have more pages than the page high water mark, |
|
* free the page back to the system. 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 || |
|
(pp->pr_alloc->pa_flags & PA_WANT) != 0)) { |
|
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. |
|
*/ |
|
s = splclock(); |
|
ph->ph_time = mono_time; |
|
splx(s); |
} |
} |
|
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; |
} |
} |
simple_unlock(&pp->pr_lock); |
|
} |
} |
|
|
/* |
/* |
* Add N items to the pool |
* Return resource to the pool; must be called at appropriate spl level |
*/ |
*/ |
int |
#ifdef POOL_DIAGNOSTIC |
pool_prime(pp, n) |
void |
struct pool *pp; |
_pool_put(struct pool *pp, void *v, const char *file, long line) |
int n; |
|
{ |
{ |
struct pool_item *pi; |
struct pool_pagelist pq; |
|
|
|
LIST_INIT(&pq); |
|
|
|
simple_lock(&pp->pr_slock); |
|
pr_enter(pp, file, line); |
|
|
|
pr_log(pp, v, PRLOG_PUT, file, line); |
|
|
|
pool_do_put(pp, v, &pq); |
|
|
|
pr_leave(pp); |
|
simple_unlock(&pp->pr_slock); |
|
|
|
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); |
|
|
|
simple_lock(&pp->pr_slock); |
|
pool_do_put(pp, v, &pq); |
|
simple_unlock(&pp->pr_slock); |
|
|
simple_lock(&pp->pr_lock); |
pr_pagelist_free(pp, &pq); |
pp->pr_hiwat += n; |
} |
while (n--) { |
|
pi = malloc(pp->pr_size, pp->pr_mtype, M_NOWAIT); |
#ifdef POOL_DIAGNOSTIC |
if (pi == NULL) { |
#define pool_put(h, v) _pool_put((h), (v), __FILE__, __LINE__) |
simple_unlock(&pp->pr_lock); |
#endif |
return (ENOMEM); |
|
|
/* |
|
* Add N items to the pool. |
|
*/ |
|
int |
|
pool_prime(struct pool *pp, int n) |
|
{ |
|
struct pool_item_header *ph = NULL; |
|
caddr_t cp; |
|
int newpages; |
|
|
|
simple_lock(&pp->pr_slock); |
|
|
|
newpages = roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage; |
|
|
|
while (newpages-- > 0) { |
|
simple_unlock(&pp->pr_slock); |
|
cp = pool_allocator_alloc(pp, PR_NOWAIT); |
|
if (__predict_true(cp != NULL)) |
|
ph = pool_alloc_item_header(pp, cp, PR_NOWAIT); |
|
|
|
if (__predict_false(cp == NULL || ph == NULL)) { |
|
if (cp != NULL) |
|
pool_allocator_free(pp, cp); |
|
simple_lock(&pp->pr_slock); |
|
break; |
} |
} |
|
|
pi->pi_next = pp->pr_freelist; |
simple_lock(&pp->pr_slock); |
pp->pr_freelist = pi; |
pool_prime_page(pp, cp, ph); |
pp->pr_freecount++; |
pp->pr_npagealloc++; |
|
pp->pr_minpages++; |
} |
} |
simple_unlock(&pp->pr_lock); |
|
|
if (pp->pr_minpages >= pp->pr_maxpages) |
|
pp->pr_maxpages = pp->pr_minpages + 1; /* XXX */ |
|
|
|
simple_unlock(&pp->pr_slock); |
return (0); |
return (0); |
} |
} |
|
|
|
/* |
|
* 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, caddr_t storage, struct pool_item_header *ph) |
|
{ |
|
struct pool_item *pi; |
|
caddr_t cp = storage; |
|
unsigned int align = pp->pr_align; |
|
unsigned int ioff = pp->pr_itemoffset; |
|
int n; |
|
int s; |
|
|
|
LOCK_ASSERT(simple_lock_held(&pp->pr_slock)); |
|
|
|
#ifdef DIAGNOSTIC |
|
if (((u_long)cp & (pp->pr_alloc->pa_pagesz - 1)) != 0) |
|
panic("pool_prime_page: %s: unaligned page", pp->pr_wchan); |
|
#endif |
|
|
|
/* |
|
* Insert page header. |
|
*/ |
|
LIST_INSERT_HEAD(&pp->pr_emptypages, ph, ph_pagelist); |
|
LIST_INIT(&ph->ph_itemlist); |
|
ph->ph_page = storage; |
|
ph->ph_nmissing = 0; |
|
s = splclock(); |
|
ph->ph_time = mono_time; |
|
splx(s); |
|
if ((pp->pr_roflags & PR_PHINPAGE) == 0) |
|
SPLAY_INSERT(phtree, &pp->pr_phtree, ph); |
|
|
|
pp->pr_nidle++; |
|
|
|
/* |
|
* Color this page. |
|
*/ |
|
cp = (caddr_t)(cp + pp->pr_curcolor); |
|
if ((pp->pr_curcolor += align) > pp->pr_maxcolor) |
|
pp->pr_curcolor = 0; |
|
|
|
/* |
|
* Adjust storage to apply aligment to `pr_itemoffset' in each item. |
|
*/ |
|
if (ioff != 0) |
|
cp = (caddr_t)(cp + (align - ioff)); |
|
|
|
/* |
|
* Insert remaining chunks on the bucket list. |
|
*/ |
|
n = pp->pr_itemsperpage; |
|
pp->pr_nitems += n; |
|
|
|
if (pp->pr_roflags & PR_NOTOUCH) { |
|
pool_item_freelist_t *freelist = PR_FREELIST(ph); |
|
int i; |
|
|
|
ph->ph_off = cp - storage; |
|
ph->ph_firstfree = 0; |
|
for (i = 0; i < n - 1; i++) |
|
freelist[i] = i + 1; |
|
freelist[n - 1] = PR_INDEX_EOL; |
|
} 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 = (caddr_t)(cp + pp->pr_size); |
|
} |
|
} |
|
|
|
/* |
|
* If the pool was depleted, point at the new page. |
|
*/ |
|
if (pp->pr_curpage == NULL) |
|
pp->pr_curpage = ph; |
|
|
|
if (++pp->pr_npages > pp->pr_hiwat) |
|
pp->pr_hiwat = pp->pr_npages; |
|
} |
|
|
|
/* |
|
* Used by pool_get() when nitems drops below the low water mark. This |
|
* is used to catch up pr_nitems with the low water mark. |
|
* |
|
* Note 1, we never wait for memory here, we let the caller decide what to do. |
|
* |
|
* Note 2, we must be called with the pool already locked, and we return |
|
* with it locked. |
|
*/ |
|
static int |
|
pool_catchup(struct pool *pp) |
|
{ |
|
struct pool_item_header *ph = NULL; |
|
caddr_t cp; |
|
int error = 0; |
|
|
|
while (POOL_NEEDS_CATCHUP(pp)) { |
|
/* |
|
* Call the page back-end allocator for more memory. |
|
* |
|
* XXX: We never wait, so should we bother unlocking |
|
* the pool descriptor? |
|
*/ |
|
simple_unlock(&pp->pr_slock); |
|
cp = pool_allocator_alloc(pp, PR_NOWAIT); |
|
if (__predict_true(cp != NULL)) |
|
ph = pool_alloc_item_header(pp, cp, PR_NOWAIT); |
|
if (__predict_false(cp == NULL || ph == NULL)) { |
|
if (cp != NULL) |
|
pool_allocator_free(pp, cp); |
|
error = ENOMEM; |
|
simple_lock(&pp->pr_slock); |
|
break; |
|
} |
|
simple_lock(&pp->pr_slock); |
|
pool_prime_page(pp, cp, ph); |
|
pp->pr_npagealloc++; |
|
} |
|
|
|
return (error); |
|
} |
|
|
|
static void |
|
pool_update_curpage(struct pool *pp) |
|
{ |
|
|
|
pp->pr_curpage = LIST_FIRST(&pp->pr_partpages); |
|
if (pp->pr_curpage == NULL) { |
|
pp->pr_curpage = LIST_FIRST(&pp->pr_emptypages); |
|
} |
|
} |
|
|
|
void |
|
pool_setlowat(struct pool *pp, int n) |
|
{ |
|
|
|
simple_lock(&pp->pr_slock); |
|
|
|
pp->pr_minitems = n; |
|
pp->pr_minpages = (n == 0) |
|
? 0 |
|
: roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage; |
|
|
|
/* Make sure we're caught up with the newly-set low water mark. */ |
|
if (POOL_NEEDS_CATCHUP(pp) && pool_catchup(pp) != 0) { |
|
/* |
|
* XXX: Should we log a warning? Should we set up a timeout |
|
* to try again in a second or so? The latter could break |
|
* a caller's assumptions about interrupt protection, etc. |
|
*/ |
|
} |
|
|
|
simple_unlock(&pp->pr_slock); |
|
} |
|
|
|
void |
|
pool_sethiwat(struct pool *pp, int n) |
|
{ |
|
|
|
simple_lock(&pp->pr_slock); |
|
|
|
pp->pr_maxpages = (n == 0) |
|
? 0 |
|
: roundup(n, pp->pr_itemsperpage) / pp->pr_itemsperpage; |
|
|
|
simple_unlock(&pp->pr_slock); |
|
} |
|
|
|
void |
|
pool_sethardlimit(struct pool *pp, int n, const char *warnmess, int ratecap) |
|
{ |
|
|
|
simple_lock(&pp->pr_slock); |
|
|
|
pp->pr_hardlimit = n; |
|
pp->pr_hardlimit_warning = warnmess; |
|
pp->pr_hardlimit_ratecap.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; |
|
|
|
simple_unlock(&pp->pr_slock); |
|
} |
|
|
|
/* |
|
* Release all complete pages that have not been used recently. |
|
*/ |
|
int |
|
#ifdef POOL_DIAGNOSTIC |
|
_pool_reclaim(struct pool *pp, const char *file, long line) |
|
#else |
|
pool_reclaim(struct pool *pp) |
|
#endif |
|
{ |
|
struct pool_item_header *ph, *phnext; |
|
struct pool_cache *pc; |
|
struct pool_pagelist pq; |
|
struct pool_cache_grouplist pcgl; |
|
struct timeval curtime, diff; |
|
int s; |
|
|
|
if (pp->pr_drain_hook != NULL) { |
|
/* |
|
* The drain hook must be called with the pool unlocked. |
|
*/ |
|
(*pp->pr_drain_hook)(pp->pr_drain_hook_arg, PR_NOWAIT); |
|
} |
|
|
|
if (simple_lock_try(&pp->pr_slock) == 0) |
|
return (0); |
|
pr_enter(pp, file, line); |
|
|
|
LIST_INIT(&pq); |
|
LIST_INIT(&pcgl); |
|
|
|
/* |
|
* Reclaim items from the pool's caches. |
|
*/ |
|
LIST_FOREACH(pc, &pp->pr_cachelist, pc_poollist) |
|
pool_cache_reclaim(pc, &pq, &pcgl); |
|
|
|
s = splclock(); |
|
curtime = mono_time; |
|
splx(s); |
|
|
|
for (ph = LIST_FIRST(&pp->pr_emptypages); ph != NULL; ph = phnext) { |
|
phnext = LIST_NEXT(ph, ph_pagelist); |
|
|
|
/* Check our minimum page claim */ |
|
if (pp->pr_npages <= pp->pr_minpages) |
|
break; |
|
|
|
KASSERT(ph->ph_nmissing == 0); |
|
timersub(&curtime, &ph->ph_time, &diff); |
|
if (diff.tv_sec < pool_inactive_time) |
|
continue; |
|
|
|
/* |
|
* If freeing this page would put us below |
|
* the low water mark, stop now. |
|
*/ |
|
if ((pp->pr_nitems - pp->pr_itemsperpage) < |
|
pp->pr_minitems) |
|
break; |
|
|
|
pr_rmpage(pp, ph, &pq); |
|
} |
|
|
|
pr_leave(pp); |
|
simple_unlock(&pp->pr_slock); |
|
if (LIST_EMPTY(&pq) && LIST_EMPTY(&pcgl)) |
|
return 0; |
|
|
|
pr_pagelist_free(pp, &pq); |
|
pcg_grouplist_free(&pcgl); |
|
return (1); |
|
} |
|
|
|
/* |
|
* Drain pools, one at a time. |
|
* |
|
* Note, we must never be called from an interrupt context. |
|
*/ |
|
void |
|
pool_drain(void *arg) |
|
{ |
|
struct pool *pp; |
|
int s; |
|
|
|
pp = NULL; |
|
s = splvm(); |
|
simple_lock(&pool_head_slock); |
|
if (drainpp == NULL) { |
|
drainpp = LIST_FIRST(&pool_head); |
|
} |
|
if (drainpp) { |
|
pp = drainpp; |
|
drainpp = LIST_NEXT(pp, pr_poollist); |
|
} |
|
simple_unlock(&pool_head_slock); |
|
pool_reclaim(pp); |
|
splx(s); |
|
} |
|
|
|
/* |
|
* Diagnostic helpers. |
|
*/ |
|
void |
|
pool_print(struct pool *pp, const char *modif) |
|
{ |
|
int s; |
|
|
|
s = splvm(); |
|
if (simple_lock_try(&pp->pr_slock) == 0) { |
|
printf("pool %s is locked; try again later\n", |
|
pp->pr_wchan); |
|
splx(s); |
|
return; |
|
} |
|
pool_print1(pp, modif, printf); |
|
simple_unlock(&pp->pr_slock); |
|
splx(s); |
|
} |
|
|
|
void |
|
pool_printit(struct pool *pp, const char *modif, void (*pr)(const char *, ...)) |
|
{ |
|
int didlock = 0; |
|
|
|
if (pp == NULL) { |
|
(*pr)("Must specify a pool to print.\n"); |
|
return; |
|
} |
|
|
|
/* |
|
* Called from DDB; interrupts should be blocked, and all |
|
* other processors should be paused. We can skip locking |
|
* the pool in this case. |
|
* |
|
* We do a simple_lock_try() just to print the lock |
|
* status, however. |
|
*/ |
|
|
|
if (simple_lock_try(&pp->pr_slock) == 0) |
|
(*pr)("WARNING: pool %s is locked\n", pp->pr_wchan); |
|
else |
|
didlock = 1; |
|
|
|
pool_print1(pp, modif, pr); |
|
|
|
if (didlock) |
|
simple_unlock(&pp->pr_slock); |
|
} |
|
|
|
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 %lu,%lu\n", |
|
ph->ph_page, ph->ph_nmissing, |
|
(u_long)ph->ph_time.tv_sec, |
|
(u_long)ph->ph_time.tv_usec); |
|
#ifdef DIAGNOSTIC |
|
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; |
|
struct pool_cache *pc; |
|
struct pool_cache_group *pcg; |
|
int i, print_log = 0, print_pagelist = 0, print_cache = 0; |
|
char c; |
|
|
|
while ((c = *modif++) != '\0') { |
|
if (c == 'l') |
|
print_log = 1; |
|
if (c == 'p') |
|
print_pagelist = 1; |
|
if (c == 'c') |
|
print_cache = 1; |
|
} |
|
|
|
(*pr)("POOL %s: size %u, align %u, ioff %u, roflags 0x%08x\n", |
|
pp->pr_wchan, pp->pr_size, pp->pr_align, pp->pr_itemoffset, |
|
pp->pr_roflags); |
|
(*pr)("\talloc %p\n", pp->pr_alloc); |
|
(*pr)("\tminitems %u, minpages %u, maxpages %u, npages %u\n", |
|
pp->pr_minitems, pp->pr_minpages, pp->pr_maxpages, pp->pr_npages); |
|
(*pr)("\titemsperpage %u, nitems %u, nout %u, hardlimit %u\n", |
|
pp->pr_itemsperpage, pp->pr_nitems, pp->pr_nout, pp->pr_hardlimit); |
|
|
|
(*pr)("\n\tnget %lu, nfail %lu, nput %lu\n", |
|
pp->pr_nget, pp->pr_nfail, pp->pr_nput); |
|
(*pr)("\tnpagealloc %lu, npagefree %lu, hiwat %u, nidle %lu\n", |
|
pp->pr_npagealloc, pp->pr_npagefree, pp->pr_hiwat, pp->pr_nidle); |
|
|
|
if (print_pagelist == 0) |
|
goto skip_pagelist; |
|
|
|
if ((ph = LIST_FIRST(&pp->pr_emptypages)) != NULL) |
|
(*pr)("\n\tempty page list:\n"); |
|
pool_print_pagelist(pp, &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: |
|
if (print_cache == 0) |
|
goto skip_cache; |
|
|
|
#define PR_GROUPLIST(pcg) \ |
|
(*pr)("\t\tgroup %p: avail %d\n", pcg, pcg->pcg_avail); \ |
|
for (i = 0; i < PCG_NOBJECTS; i++) { \ |
|
if (pcg->pcg_objects[i].pcgo_pa != \ |
|
POOL_PADDR_INVALID) { \ |
|
(*pr)("\t\t\t%p, 0x%llx\n", \ |
|
pcg->pcg_objects[i].pcgo_va, \ |
|
(unsigned long long) \ |
|
pcg->pcg_objects[i].pcgo_pa); \ |
|
} else { \ |
|
(*pr)("\t\t\t%p\n", \ |
|
pcg->pcg_objects[i].pcgo_va); \ |
|
} \ |
|
} |
|
|
|
LIST_FOREACH(pc, &pp->pr_cachelist, pc_poollist) { |
|
(*pr)("\tcache %p\n", pc); |
|
(*pr)("\t hits %lu misses %lu ngroups %lu nitems %lu\n", |
|
pc->pc_hits, pc->pc_misses, pc->pc_ngroups, pc->pc_nitems); |
|
(*pr)("\t full groups:\n"); |
|
LIST_FOREACH(pcg, &pc->pc_fullgroups, pcg_list) { |
|
PR_GROUPLIST(pcg); |
|
} |
|
(*pr)("\t partial groups:\n"); |
|
LIST_FOREACH(pcg, &pc->pc_partgroups, pcg_list) { |
|
PR_GROUPLIST(pcg); |
|
} |
|
(*pr)("\t empty groups:\n"); |
|
LIST_FOREACH(pcg, &pc->pc_emptygroups, pcg_list) { |
|
PR_GROUPLIST(pcg); |
|
} |
|
} |
|
#undef PR_GROUPLIST |
|
|
|
skip_cache: |
|
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; |
|
caddr_t page; |
|
int n; |
|
|
|
page = (caddr_t)((u_long)ph & pp->pr_alloc->pa_pagemask); |
|
if (page != ph->ph_page && |
|
(pp->pr_roflags & PR_PHINPAGE) != 0) { |
|
if (label != NULL) |
|
printf("%s: ", label); |
|
printf("pool(%p:%s): page inconsistency: page %p;" |
|
" at page head addr %p (p %p)\n", pp, |
|
pp->pr_wchan, ph->ph_page, |
|
ph, page); |
|
return 1; |
|
} |
|
|
|
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 (p %p)\n", |
|
pp->pr_wchan, pi->pi_magic, ph->ph_page, |
|
n, pi, page); |
|
panic("pool"); |
|
} |
|
#endif |
|
page = |
|
(caddr_t)((u_long)pi & pp->pr_alloc->pa_pagemask); |
|
if (page == ph->ph_page) |
|
continue; |
|
|
|
if (label != NULL) |
|
printf("%s: ", label); |
|
printf("pool(%p:%s): page inconsistency: page %p;" |
|
" item ordinal %d; addr %p (p %p)\n", pp, |
|
pp->pr_wchan, ph->ph_page, |
|
n, pi, page); |
|
return 1; |
|
} |
|
return 0; |
|
} |
|
|
|
|
|
int |
|
pool_chk(struct pool *pp, const char *label) |
|
{ |
|
struct pool_item_header *ph; |
|
int r = 0; |
|
|
|
simple_lock(&pp->pr_slock); |
|
LIST_FOREACH(ph, &pp->pr_emptypages, ph_pagelist) { |
|
r = pool_chk_page(pp, label, ph); |
|
if (r) { |
|
goto out; |
|
} |
|
} |
|
LIST_FOREACH(ph, &pp->pr_fullpages, ph_pagelist) { |
|
r = pool_chk_page(pp, label, ph); |
|
if (r) { |
|
goto out; |
|
} |
|
} |
|
LIST_FOREACH(ph, &pp->pr_partpages, ph_pagelist) { |
|
r = pool_chk_page(pp, label, ph); |
|
if (r) { |
|
goto out; |
|
} |
|
} |
|
|
|
out: |
|
simple_unlock(&pp->pr_slock); |
|
return (r); |
|
} |
|
|
|
/* |
|
* pool_cache_init: |
|
* |
|
* Initialize a pool cache. |
|
* |
|
* NOTE: If the pool must be protected from interrupts, we expect |
|
* to be called at the appropriate interrupt priority level. |
|
*/ |
|
void |
|
pool_cache_init(struct pool_cache *pc, struct pool *pp, |
|
int (*ctor)(void *, void *, int), |
|
void (*dtor)(void *, void *), |
|
void *arg) |
|
{ |
|
|
|
LIST_INIT(&pc->pc_emptygroups); |
|
LIST_INIT(&pc->pc_fullgroups); |
|
LIST_INIT(&pc->pc_partgroups); |
|
simple_lock_init(&pc->pc_slock); |
|
|
|
pc->pc_pool = pp; |
|
|
|
pc->pc_ctor = ctor; |
|
pc->pc_dtor = dtor; |
|
pc->pc_arg = arg; |
|
|
|
pc->pc_hits = 0; |
|
pc->pc_misses = 0; |
|
|
|
pc->pc_ngroups = 0; |
|
|
|
pc->pc_nitems = 0; |
|
|
|
simple_lock(&pp->pr_slock); |
|
LIST_INSERT_HEAD(&pp->pr_cachelist, pc, pc_poollist); |
|
simple_unlock(&pp->pr_slock); |
|
} |
|
|
|
/* |
|
* pool_cache_destroy: |
|
* |
|
* Destroy a pool cache. |
|
*/ |
|
void |
|
pool_cache_destroy(struct pool_cache *pc) |
|
{ |
|
struct pool *pp = pc->pc_pool; |
|
|
|
/* First, invalidate the entire cache. */ |
|
pool_cache_invalidate(pc); |
|
|
|
/* ...and remove it from the pool's cache list. */ |
|
simple_lock(&pp->pr_slock); |
|
LIST_REMOVE(pc, pc_poollist); |
|
simple_unlock(&pp->pr_slock); |
|
} |
|
|
|
static __inline void * |
|
pcg_get(struct pool_cache_group *pcg, paddr_t *pap) |
|
{ |
|
void *object; |
|
u_int idx; |
|
|
|
KASSERT(pcg->pcg_avail <= PCG_NOBJECTS); |
|
KASSERT(pcg->pcg_avail != 0); |
|
idx = --pcg->pcg_avail; |
|
|
|
KASSERT(pcg->pcg_objects[idx].pcgo_va != NULL); |
|
object = pcg->pcg_objects[idx].pcgo_va; |
|
if (pap != NULL) |
|
*pap = pcg->pcg_objects[idx].pcgo_pa; |
|
pcg->pcg_objects[idx].pcgo_va = NULL; |
|
|
|
return (object); |
|
} |
|
|
|
static __inline void |
|
pcg_put(struct pool_cache_group *pcg, void *object, paddr_t pa) |
|
{ |
|
u_int idx; |
|
|
|
KASSERT(pcg->pcg_avail < PCG_NOBJECTS); |
|
idx = pcg->pcg_avail++; |
|
|
|
KASSERT(pcg->pcg_objects[idx].pcgo_va == NULL); |
|
pcg->pcg_objects[idx].pcgo_va = object; |
|
pcg->pcg_objects[idx].pcgo_pa = pa; |
|
} |
|
|
|
static void |
|
pcg_grouplist_free(struct pool_cache_grouplist *pcgl) |
|
{ |
|
struct pool_cache_group *pcg; |
|
int s; |
|
|
|
s = splvm(); |
|
while ((pcg = LIST_FIRST(pcgl)) != NULL) { |
|
LIST_REMOVE(pcg, pcg_list); |
|
pool_put(&pcgpool, pcg); |
|
} |
|
splx(s); |
|
} |
|
|
|
/* |
|
* pool_cache_get{,_paddr}: |
|
* |
|
* Get an object from a pool cache (optionally returning |
|
* the physical address of the object). |
|
*/ |
|
void * |
|
pool_cache_get_paddr(struct pool_cache *pc, int flags, paddr_t *pap) |
|
{ |
|
struct pool_cache_group *pcg; |
|
void *object; |
|
|
|
#ifdef LOCKDEBUG |
|
if (flags & PR_WAITOK) |
|
simple_lock_only_held(NULL, "pool_cache_get(PR_WAITOK)"); |
|
#endif |
|
|
|
simple_lock(&pc->pc_slock); |
|
|
|
pcg = LIST_FIRST(&pc->pc_partgroups); |
|
if (pcg == NULL) { |
|
pcg = LIST_FIRST(&pc->pc_fullgroups); |
|
if (pcg != NULL) { |
|
LIST_REMOVE(pcg, pcg_list); |
|
LIST_INSERT_HEAD(&pc->pc_partgroups, pcg, pcg_list); |
|
} |
|
} |
|
if (pcg == NULL) { |
|
|
|
/* |
|
* No groups with any available objects. Allocate |
|
* a new object, construct it, and return it to |
|
* the caller. We will allocate a group, if necessary, |
|
* when the object is freed back to the cache. |
|
*/ |
|
pc->pc_misses++; |
|
simple_unlock(&pc->pc_slock); |
|
object = pool_get(pc->pc_pool, flags); |
|
if (object != NULL && pc->pc_ctor != NULL) { |
|
if ((*pc->pc_ctor)(pc->pc_arg, object, flags) != 0) { |
|
pool_put(pc->pc_pool, object); |
|
return (NULL); |
|
} |
|
} |
|
if (object != NULL && pap != NULL) { |
|
#ifdef POOL_VTOPHYS |
|
*pap = POOL_VTOPHYS(object); |
|
#else |
|
*pap = POOL_PADDR_INVALID; |
|
#endif |
|
} |
|
return (object); |
|
} |
|
|
|
pc->pc_hits++; |
|
pc->pc_nitems--; |
|
object = pcg_get(pcg, pap); |
|
|
|
if (pcg->pcg_avail == 0) { |
|
LIST_REMOVE(pcg, pcg_list); |
|
LIST_INSERT_HEAD(&pc->pc_emptygroups, pcg, pcg_list); |
|
} |
|
simple_unlock(&pc->pc_slock); |
|
|
|
return (object); |
|
} |
|
|
|
/* |
|
* pool_cache_put{,_paddr}: |
|
* |
|
* Put an object back to the pool cache (optionally caching the |
|
* physical address of the object). |
|
*/ |
|
void |
|
pool_cache_put_paddr(struct pool_cache *pc, void *object, paddr_t pa) |
|
{ |
|
struct pool_cache_group *pcg; |
|
int s; |
|
|
|
simple_lock(&pc->pc_slock); |
|
|
|
pcg = LIST_FIRST(&pc->pc_partgroups); |
|
if (pcg == NULL) { |
|
pcg = LIST_FIRST(&pc->pc_emptygroups); |
|
if (pcg != NULL) { |
|
LIST_REMOVE(pcg, pcg_list); |
|
LIST_INSERT_HEAD(&pc->pc_partgroups, pcg, pcg_list); |
|
} |
|
} |
|
if (pcg == NULL) { |
|
|
|
/* |
|
* No empty groups to free the object to. Attempt to |
|
* allocate one. |
|
*/ |
|
simple_unlock(&pc->pc_slock); |
|
s = splvm(); |
|
pcg = pool_get(&pcgpool, PR_NOWAIT); |
|
splx(s); |
|
if (pcg == NULL) { |
|
|
|
/* |
|
* Unable to allocate a cache group; destruct the object |
|
* and free it back to the pool. |
|
*/ |
|
pool_cache_destruct_object(pc, object); |
|
return; |
|
} |
|
memset(pcg, 0, sizeof(*pcg)); |
|
simple_lock(&pc->pc_slock); |
|
pc->pc_ngroups++; |
|
LIST_INSERT_HEAD(&pc->pc_partgroups, pcg, pcg_list); |
|
} |
|
|
|
pc->pc_nitems++; |
|
pcg_put(pcg, object, pa); |
|
|
|
if (pcg->pcg_avail == PCG_NOBJECTS) { |
|
LIST_REMOVE(pcg, pcg_list); |
|
LIST_INSERT_HEAD(&pc->pc_fullgroups, pcg, pcg_list); |
|
} |
|
simple_unlock(&pc->pc_slock); |
|
} |
|
|
|
/* |
|
* pool_cache_destruct_object: |
|
* |
|
* Force destruction of an object and its release back into |
|
* the pool. |
|
*/ |
|
void |
|
pool_cache_destruct_object(struct pool_cache *pc, void *object) |
|
{ |
|
|
|
if (pc->pc_dtor != NULL) |
|
(*pc->pc_dtor)(pc->pc_arg, object); |
|
pool_put(pc->pc_pool, object); |
|
} |
|
|
|
static void |
|
pool_do_cache_invalidate(struct pool_cache *pc, struct pool_pagelist *pq, |
|
struct pool_cache_grouplist *pcgl) |
|
{ |
|
struct pool_cache_group *pcg, *npcg; |
|
void *object; |
|
|
|
LOCK_ASSERT(simple_lock_held(&pc->pc_slock)); |
|
LOCK_ASSERT(simple_lock_held(&pc->pc_pool->pr_slock)); |
|
|
|
for (pcg = LIST_FIRST(&pc->pc_fullgroups); pcg != NULL; pcg = npcg) { |
|
|
|
loop: |
|
npcg = LIST_NEXT(pcg, pcg_list); |
|
while (pcg->pcg_avail != 0) { |
|
pc->pc_nitems--; |
|
object = pcg_get(pcg, NULL); |
|
if (pc->pc_dtor != NULL) |
|
(*pc->pc_dtor)(pc->pc_arg, object); |
|
pool_do_put(pc->pc_pool, object, pq); |
|
} |
|
pc->pc_ngroups--; |
|
LIST_REMOVE(pcg, pcg_list); |
|
LIST_INSERT_HEAD(pcgl, pcg, pcg_list); |
|
} |
|
pcg = LIST_FIRST(&pc->pc_partgroups); |
|
if (pcg != NULL) { |
|
goto loop; |
|
} |
|
|
|
KASSERT(LIST_EMPTY(&pc->pc_partgroups)); |
|
KASSERT(LIST_EMPTY(&pc->pc_fullgroups)); |
|
KASSERT(pc->pc_nitems == 0); |
|
} |
|
|
|
/* |
|
* pool_cache_invalidate: |
|
* |
|
* Invalidate a pool cache (destruct and release all of the |
|
* cached objects). |
|
*/ |
|
void |
|
pool_cache_invalidate(struct pool_cache *pc) |
|
{ |
|
struct pool_pagelist pq; |
|
struct pool_cache_grouplist pcgl; |
|
|
|
LIST_INIT(&pq); |
|
LIST_INIT(&pcgl); |
|
|
|
simple_lock(&pc->pc_slock); |
|
simple_lock(&pc->pc_pool->pr_slock); |
|
|
|
pool_do_cache_invalidate(pc, &pq, &pcgl); |
|
|
|
simple_unlock(&pc->pc_pool->pr_slock); |
|
simple_unlock(&pc->pc_slock); |
|
|
|
pr_pagelist_free(pc->pc_pool, &pq); |
|
pcg_grouplist_free(&pcgl); |
|
} |
|
|
|
/* |
|
* pool_cache_reclaim: |
|
* |
|
* Reclaim a pool cache for pool_reclaim(). |
|
*/ |
|
static void |
|
pool_cache_reclaim(struct pool_cache *pc, struct pool_pagelist *pq, |
|
struct pool_cache_grouplist *pcgl) |
|
{ |
|
|
|
/* |
|
* We're locking in the wrong order (normally pool_cache -> pool, |
|
* but the pool is already locked when we get here), so we have |
|
* to use trylock. If we can't lock the pool_cache, it's not really |
|
* a big deal here. |
|
*/ |
|
if (simple_lock_try(&pc->pc_slock) == 0) |
|
return; |
|
|
|
pool_do_cache_invalidate(pc, pq, pcgl); |
|
|
|
simple_unlock(&pc->pc_slock); |
|
} |
|
|
|
/* |
|
* Pool backend allocators. |
|
* |
|
* Each pool has a backend allocator that handles allocation, deallocation, |
|
* and any additional draining that might be needed. |
|
* |
|
* We provide two standard allocators: |
|
* |
|
* pool_allocator_kmem - the default when no allocator is specified |
|
* |
|
* pool_allocator_nointr - used for pools that will not be accessed |
|
* in interrupt context. |
|
*/ |
|
void *pool_page_alloc(struct pool *, int); |
|
void pool_page_free(struct pool *, void *); |
|
|
|
struct pool_allocator pool_allocator_kmem = { |
|
pool_page_alloc, pool_page_free, 0, |
|
}; |
|
|
|
void *pool_page_alloc_nointr(struct pool *, int); |
|
void pool_page_free_nointr(struct pool *, void *); |
|
|
|
struct pool_allocator pool_allocator_nointr = { |
|
pool_page_alloc_nointr, pool_page_free_nointr, 0, |
|
}; |
|
|
|
#ifdef POOL_SUBPAGE |
|
void *pool_subpage_alloc(struct pool *, int); |
|
void pool_subpage_free(struct pool *, void *); |
|
|
|
struct pool_allocator pool_allocator_kmem_subpage = { |
|
pool_subpage_alloc, pool_subpage_free, 0, |
|
}; |
|
#endif /* POOL_SUBPAGE */ |
|
|
|
/* |
|
* We have at least three different resources for the same allocation and |
|
* each resource can be depleted. First, we have the ready elements in the |
|
* pool. Then we have the resource (typically a vm_map) for this allocator. |
|
* Finally, we have physical memory. Waiting for any of these can be |
|
* unnecessary when any other is freed, but the kernel doesn't support |
|
* sleeping on multiple wait channels, so we have to employ another strategy. |
|
* |
|
* The caller sleeps on the pool (so that it can be awakened when an item |
|
* is returned to the pool), but we set PA_WANT on the allocator. When a |
|
* page is returned to the allocator and PA_WANT is set, pool_allocator_free |
|
* will wake up all sleeping pools belonging to this allocator. |
|
* |
|
* XXX Thundering herd. |
|
*/ |
|
void * |
|
pool_allocator_alloc(struct pool *org, int flags) |
|
{ |
|
struct pool_allocator *pa = org->pr_alloc; |
|
struct pool *pp, *start; |
|
int s, freed; |
|
void *res; |
|
|
|
LOCK_ASSERT(!simple_lock_held(&org->pr_slock)); |
|
|
|
do { |
|
if ((res = (*pa->pa_alloc)(org, flags)) != NULL) |
|
return (res); |
|
if ((flags & PR_WAITOK) == 0) { |
|
/* |
|
* We only run the drain hookhere if PR_NOWAIT. |
|
* In other cases, the hook will be run in |
|
* pool_reclaim(). |
|
*/ |
|
if (org->pr_drain_hook != NULL) { |
|
(*org->pr_drain_hook)(org->pr_drain_hook_arg, |
|
flags); |
|
if ((res = (*pa->pa_alloc)(org, flags)) != NULL) |
|
return (res); |
|
} |
|
break; |
|
} |
|
|
|
/* |
|
* Drain all pools, except "org", that use this |
|
* allocator. We do this to reclaim VA space. |
|
* pa_alloc is responsible for waiting for |
|
* physical memory. |
|
* |
|
* XXX We risk looping forever if start if someone |
|
* calls pool_destroy on "start". But there is no |
|
* other way to have potentially sleeping pool_reclaim, |
|
* non-sleeping locks on pool_allocator, and some |
|
* stirring of drained pools in the allocator. |
|
* |
|
* XXX Maybe we should use pool_head_slock for locking |
|
* the allocators? |
|
*/ |
|
freed = 0; |
|
|
|
s = splvm(); |
|
simple_lock(&pa->pa_slock); |
|
pp = start = TAILQ_FIRST(&pa->pa_list); |
|
do { |
|
TAILQ_REMOVE(&pa->pa_list, pp, pr_alloc_list); |
|
TAILQ_INSERT_TAIL(&pa->pa_list, pp, pr_alloc_list); |
|
if (pp == org) |
|
continue; |
|
simple_unlock(&pa->pa_slock); |
|
freed = pool_reclaim(pp); |
|
simple_lock(&pa->pa_slock); |
|
} while ((pp = TAILQ_FIRST(&pa->pa_list)) != start && |
|
freed == 0); |
|
|
|
if (freed == 0) { |
|
/* |
|
* We set PA_WANT here, the caller will most likely |
|
* sleep waiting for pages (if not, this won't hurt |
|
* that much), and there is no way to set this in |
|
* the caller without violating locking order. |
|
*/ |
|
pa->pa_flags |= PA_WANT; |
|
} |
|
simple_unlock(&pa->pa_slock); |
|
splx(s); |
|
} while (freed); |
|
return (NULL); |
|
} |
|
|
|
void |
|
pool_allocator_free(struct pool *pp, void *v) |
|
{ |
|
struct pool_allocator *pa = pp->pr_alloc; |
|
int s; |
|
|
|
LOCK_ASSERT(!simple_lock_held(&pp->pr_slock)); |
|
|
|
(*pa->pa_free)(pp, v); |
|
|
|
s = splvm(); |
|
simple_lock(&pa->pa_slock); |
|
if ((pa->pa_flags & PA_WANT) == 0) { |
|
simple_unlock(&pa->pa_slock); |
|
splx(s); |
|
return; |
|
} |
|
|
|
TAILQ_FOREACH(pp, &pa->pa_list, pr_alloc_list) { |
|
simple_lock(&pp->pr_slock); |
|
if ((pp->pr_flags & PR_WANTED) != 0) { |
|
pp->pr_flags &= ~PR_WANTED; |
|
wakeup(pp); |
|
} |
|
simple_unlock(&pp->pr_slock); |
|
} |
|
pa->pa_flags &= ~PA_WANT; |
|
simple_unlock(&pa->pa_slock); |
|
splx(s); |
|
} |
|
|
|
void * |
|
pool_page_alloc(struct pool *pp, int flags) |
|
{ |
|
boolean_t waitok = (flags & PR_WAITOK) ? TRUE : FALSE; |
|
|
|
return ((void *) uvm_km_alloc_poolpage_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) |
|
{ |
|
boolean_t 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) |
|
{ |
|
void *v; |
|
int s; |
|
s = splvm(); |
|
v = pool_get(&psppool, flags); |
|
splx(s); |
|
return v; |
|
} |
|
|
|
void |
|
pool_subpage_free(struct pool *pp, void *v) |
|
{ |
|
int s; |
|
s = splvm(); |
|
pool_put(&psppool, v); |
|
splx(s); |
|
} |
|
|
|
/* We don't provide a real nointr allocator. Maybe later. */ |
|
void * |
|
pool_page_alloc_nointr(struct pool *pp, int flags) |
|
{ |
|
|
|
return (pool_subpage_alloc(pp, flags)); |
|
} |
|
|
|
void |
|
pool_page_free_nointr(struct pool *pp, void *v) |
|
{ |
|
|
|
pool_subpage_free(pp, v); |
|
} |
|
#else |
|
void * |
|
pool_page_alloc_nointr(struct pool *pp, int flags) |
|
{ |
|
boolean_t waitok = (flags & PR_WAITOK) ? TRUE : FALSE; |
|
|
|
return ((void *) uvm_km_alloc_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); |
|
} |
|
#endif /* POOL_SUBPAGE */ |