acpi/acpica/utcache.c

4  * Module Name: utcache - local cache allocation routines
21  * PARAMETERS:  cache_name      - Ascii name for the cache
23  *              max_depth       - Maximum depth of the cache (in objects)
24  *              return_cache    - Where the new cache object is returned
28  * DESCRIPTION: Create a cache object
36 	struct acpi_memory_list *cache;
44 	/* Create the cache object */
46 	cache = acpi_os_allocate(sizeof(struct acpi_memory_list));
47 	if (!cache) {
51 	/* Populate the cache object and return it */
53 	memset(cache, 0, sizeof(struct acpi_memory_list));
54 	cache->list_name = cache_name;
55 	cache->object_size = object_size;
56 	cache->max_depth = max_depth;
58 	*return_cache = cache;
66  * PARAMETERS:  cache           - Handle to cache object
70  * DESCRIPTION: Free all objects within the requested cache.
74 acpi_status acpi_os_purge_cache(struct acpi_memory_list *cache)
81 	if (!cache) {
90 	/* Walk the list of objects in this cache */
92 	while (cache->list_head) {
96 		next = ACPI_GET_DESCRIPTOR_PTR(cache->list_head);
97 		ACPI_FREE(cache->list_head);
99 		cache->list_head = next;
100 		cache->current_depth--;
111  * PARAMETERS:  cache           - Handle to cache object
115  * DESCRIPTION: Free all objects within the requested cache and delete the
116  *              cache object.
120 acpi_status acpi_os_delete_cache(struct acpi_memory_list *cache)
126 	/* Purge all objects in the cache */
128 	status = acpi_os_purge_cache(cache);
133 	/* Now we can delete the cache object */
135 	acpi_os_free(cache);
143  * PARAMETERS:  cache       - Handle to cache object
148  * DESCRIPTION: Release an object to the specified cache. If cache is full,
153 acpi_status acpi_os_release_object(struct acpi_memory_list *cache, void *object)
159 	if (!cache || !object) {
163 	/* If cache is full, just free this object */
165 	if (cache->current_depth >= cache->max_depth) {
167 		ACPI_MEM_TRACKING(cache->total_freed++);
170 	/* Otherwise put this object back into the cache */
180 		memset(object, 0xCA, cache->object_size);
183 		/* Put the object at the head of the cache list */
185 		ACPI_SET_DESCRIPTOR_PTR(object, cache->list_head);
186 		cache->list_head = object;
187 		cache->current_depth++;
199  * PARAMETERS:  cache           - Handle to cache object
203  * DESCRIPTION: Get an object from the specified cache. If cache is empty,
208 void *acpi_os_acquire_object(struct acpi_memory_list *cache)
215 	if (!cache) {
224 	ACPI_MEM_TRACKING(cache->requests++);
226 	/* Check the cache first */
228 	if (cache->list_head) {
232 		object = cache->list_head;
233 		cache->list_head = ACPI_GET_DESCRIPTOR_PTR(object);
235 		cache->current_depth--;
237 		ACPI_MEM_TRACKING(cache->hits++);
239 				      "%s: Object %p from %s cache\n",
241 				      cache->list_name));
250 		memset(object, 0, cache->object_size);
252 		/* The cache is empty, create a new object */
254 		ACPI_MEM_TRACKING(cache->total_allocated++);
257 		if ((cache->total_allocated - cache->total_freed) >
258 		    cache->max_occupied) {
259 			cache->max_occupied =
260 			    cache->total_allocated - cache->total_freed;
271 		object = ACPI_ALLOCATE_ZEROED(cache->object_size);