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121 lines
3.9 KiB
121 lines
3.9 KiB
5 months ago
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/*
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* include/haproxy/pool-t.h
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* Memory pools configuration and type definitions.
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*
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* Copyright (C) 2000-2020 Willy Tarreau - w@1wt.eu
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation, version 2.1
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* exclusively.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _HAPROXY_POOL_T_H
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#define _HAPROXY_POOL_T_H
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#include <haproxy/api-t.h>
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#include <haproxy/list-t.h>
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#include <haproxy/thread-t.h>
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/* On architectures supporting threads and double-word CAS, we can implement
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* lock-less memory pools. This isn't supported for debugging modes however.
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*/
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#if defined(USE_THREAD) && defined(HA_HAVE_CAS_DW) && !defined(DEBUG_NO_LOCKLESS_POOLS) && !defined(DEBUG_UAF) && !defined(DEBUG_FAIL_ALLOC)
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#define CONFIG_HAP_LOCKLESS_POOLS
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#endif
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/* On architectures supporting threads we can amortize the locking cost using
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* local pools.
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*/
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#if defined(USE_THREAD) && !defined(DEBUG_NO_LOCAL_POOLS) && !defined(DEBUG_UAF) && !defined(DEBUG_FAIL_ALLOC)
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#define CONFIG_HAP_LOCAL_POOLS
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#endif
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/* Pools of very similar size are shared by default, unless macro
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* DEBUG_DONT_SHARE_POOLS is set.
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*/
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#ifndef DEBUG_DONT_SHARE_POOLS
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#define MEM_F_SHARED 0x1
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#else
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#define MEM_F_SHARED 0
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#endif
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#define MEM_F_EXACT 0x2
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/* By default, free objects are linked by a pointer stored at the beginning of
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* the memory area. When DEBUG_MEMORY_POOLS is set, the allocated area is
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* inflated by the size of a pointer so that the link is placed at the end
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* of the objects. Hence free objects in pools remain intact. In addition,
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* this location is used to keep a pointer to the pool the object was
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* allocated from, and verify it's freed into the appropriate one.
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*/
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#ifdef DEBUG_MEMORY_POOLS
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#define POOL_EXTRA (sizeof(void *))
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#define POOL_LINK(pool, item) (void **)(((char *)(item)) + ((pool)->size))
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#else
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#define POOL_EXTRA (0)
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#define POOL_LINK(pool, item) ((void **)(item))
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#endif
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#ifndef MAX_BASE_POOLS
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#define MAX_BASE_POOLS 64
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#endif
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#define POOL_AVG_SAMPLES 1024
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struct pool_cache_head {
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struct list list; /* head of objects in this pool */
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size_t size; /* size of an object */
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unsigned int count; /* number of objects in this pool */
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};
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struct pool_cache_item {
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struct list by_pool; /* link to objects in this pool */
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struct list by_lru; /* link to objects by LRU order */
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};
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struct pool_free_list {
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void **free_list;
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uintptr_t seq;
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};
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/* Note below, in case of lockless pools, we still need the lock only for
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* the flush() operation.
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*/
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struct pool_head {
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void **free_list;
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#ifdef CONFIG_HAP_LOCKLESS_POOLS
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uintptr_t seq;
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#endif
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__decl_thread(HA_SPINLOCK_T lock); /* the spin lock */
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unsigned int used; /* how many chunks are currently in use */
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unsigned int needed_avg;/* floating indicator between used and allocated */
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unsigned int allocated; /* how many chunks have been allocated */
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unsigned int limit; /* hard limit on the number of chunks */
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unsigned int minavail; /* how many chunks are expected to be used */
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unsigned int size; /* chunk size */
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unsigned int flags; /* MEM_F_* */
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unsigned int users; /* number of pools sharing this zone */
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unsigned int failed; /* failed allocations */
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struct list list; /* list of all known pools */
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char name[12]; /* name of the pool */
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} __attribute__((aligned(64)));
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#endif /* _HAPROXY_POOL_T_H */
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/*
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* Local variables:
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* c-indent-level: 8
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* c-basic-offset: 8
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* End:
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*/
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