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Code Editor : mempool.c
/* -*- linux-c -*- * Preallocated memory pools * Copyright (C) 2008-2009 Red Hat Inc. * * This file is part of systemtap, and is free software. You can * redistribute it and/or modify it under the terms of the GNU General * Public License (GPL); either version 2, or (at your option) any * later version. */ #ifndef _STP_MEMPOOL_C_ #define _STP_MEMPOOL_C_ /* An opaque struct identifying the memory pool. */ typedef struct { struct list_head free_list; unsigned num; unsigned size; spinlock_t lock; } _stp_mempool_t; /* for internal use only */ struct _stp_mem_buffer { struct list_head list; _stp_mempool_t *pool; void *buf; }; /* Delete a memory pool */ static void _stp_mempool_destroy(_stp_mempool_t *pool) { struct list_head *p, *tmp; if (pool) { list_for_each_safe(p, tmp, &pool->free_list) { list_del(p); _stp_kfree(p); } _stp_kfree(pool); } } /* Create a new memory pool */ static _stp_mempool_t *_stp_mempool_init(size_t size, size_t num) { int i, alloc_size; struct _stp_mem_buffer *m; _stp_mempool_t *pool = (_stp_mempool_t *)_stp_kmalloc(sizeof(_stp_mempool_t)); if (unlikely(pool == NULL)) { errk("Memory allocation failed.\n"); return NULL; } INIT_LIST_HEAD(&pool->free_list); spin_lock_init(&pool->lock); alloc_size = size + sizeof(struct _stp_mem_buffer) - sizeof(void *); for (i = 0; i < num; i++) { m = (struct _stp_mem_buffer *)_stp_kmalloc(alloc_size); if (unlikely(m == NULL)) goto err; m->pool = pool; list_add((struct list_head *)m, &pool->free_list); } pool->num = num; pool->size = alloc_size; return pool; err: _stp_mempool_destroy(pool); return NULL; } /* allocate a buffer from a memory pool */ static void *_stp_mempool_alloc(_stp_mempool_t *pool) { unsigned long flags; struct _stp_mem_buffer *ptr = NULL; /* PR14804: tolerate accidental early call, before pool is actually initialized. */ if (pool == NULL) return NULL; spin_lock_irqsave(&pool->lock, flags); if (likely(!list_empty(&pool->free_list))) { ptr = (struct _stp_mem_buffer *)pool->free_list.next; list_del_init(&ptr->list); spin_unlock_irqrestore(&pool->lock, flags); return &ptr->buf; } spin_unlock_irqrestore(&pool->lock, flags); return NULL; } /* return a buffer to its memory pool */ static void _stp_mempool_free(void *buf) { unsigned long flags; struct _stp_mem_buffer *m = container_of(buf, struct _stp_mem_buffer, buf); spin_lock_irqsave(&m->pool->lock, flags); list_add(&m->list, &m->pool->free_list); spin_unlock_irqrestore(&m->pool->lock, flags); } #endif /* _STP_MEMPOOL_C_ */
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