68 строки
1.4 KiB
C
68 строки
1.4 KiB
C
#ifndef IOU_ALLOC_CACHE_H
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#define IOU_ALLOC_CACHE_H
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/*
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* Don't allow the cache to grow beyond this size.
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*/
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#define IO_ALLOC_CACHE_MAX 512
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struct io_cache_entry {
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struct io_wq_work_node node;
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};
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static inline bool io_alloc_cache_put(struct io_alloc_cache *cache,
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struct io_cache_entry *entry)
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{
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if (cache->nr_cached < cache->max_cached) {
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cache->nr_cached++;
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wq_stack_add_head(&entry->node, &cache->list);
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/* KASAN poisons object */
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kasan_slab_free_mempool(entry);
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return true;
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}
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return false;
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}
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static inline bool io_alloc_cache_empty(struct io_alloc_cache *cache)
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{
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return !cache->list.next;
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}
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static inline struct io_cache_entry *io_alloc_cache_get(struct io_alloc_cache *cache)
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{
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if (cache->list.next) {
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struct io_cache_entry *entry;
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entry = container_of(cache->list.next, struct io_cache_entry, node);
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kasan_unpoison_range(entry, cache->elem_size);
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cache->list.next = cache->list.next->next;
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cache->nr_cached--;
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return entry;
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}
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return NULL;
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}
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static inline void io_alloc_cache_init(struct io_alloc_cache *cache,
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unsigned max_nr, size_t size)
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{
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cache->list.next = NULL;
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cache->nr_cached = 0;
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cache->max_cached = max_nr;
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cache->elem_size = size;
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}
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static inline void io_alloc_cache_free(struct io_alloc_cache *cache,
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void (*free)(struct io_cache_entry *))
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{
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while (1) {
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struct io_cache_entry *entry = io_alloc_cache_get(cache);
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if (!entry)
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break;
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free(entry);
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}
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cache->nr_cached = 0;
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}
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#endif
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