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Per-object max size

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This commit is contained in:
Vicent Marti 2013-04-03 23:39:42 +02:00
parent cf7850a4f7
commit 064236ca45
2 changed files with 29 additions and 28 deletions
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56
src/cache.c
View File

@ -17,21 +17,20 @@
GIT__USE_OIDMAP
bool git_cache__store_types[8] = {
false, /* GIT_OBJ__EXT1 */
true, /* GIT_OBJ_COMMIT */
true, /* GIT_OBJ_TREE */
false, /* GIT_OBJ_BLOB */
true, /* GIT_OBJ_TAG */
false, /* GIT_OBJ__EXT2 */
false, /* GIT_OBJ_OFS_DELTA */
false /* GIT_OBJ_REF_DELTA */
size_t git_cache__max_object_size[8] = {
0, /* GIT_OBJ__EXT1 */
4096, /* GIT_OBJ_COMMIT */
4096, /* GIT_OBJ_TREE */
0, /* GIT_OBJ_BLOB */
4096, /* GIT_OBJ_TAG */
0, /* GIT_OBJ__EXT2 */
0, /* GIT_OBJ_OFS_DELTA */
0 /* GIT_OBJ_REF_DELTA */
};
size_t git_cache__max_object_size = 4096;
int git_cache_init(git_cache *cache)
{
cache->used_memory = 0;
cache->map = git_oidmap_alloc();
git_mutex_init(&cache->lock);
return 0;
@ -43,30 +42,35 @@ void git_cache_free(git_cache *cache)
git_mutex_free(&cache->lock);
}
static void cache_evict_entries(git_cache *cache, size_t evict)
/* Call with lock, yo */
static void cache_evict_entries(git_cache *cache, size_t evict_count)
{
uint32_t seed = rand();
/* do not infinite loop if there's not enough entries to evict */
if (evict > kh_size(cache->map))
if (evict_count > kh_size(cache->map))
return;
while (evict > 0) {
while (evict_count > 0) {
khiter_t pos = seed++ % kh_end(cache->map);
if (kh_exist(cache->map, pos)) {
git_cached_obj *evict = kh_val(cache->map, pos);
evict_count--;
cache->used_memory -= evict->size;
git_cached_obj_decref(evict);
kh_del(oid, cache->map, pos);
evict--;
}
}
}
static bool cache_should_store(git_otype object_type, size_t object_size)
{
if (!git_cache__store_types[object_type])
return false;
size_t max_size = git_cache__max_object_size[object_type];
if (object_size > git_cache__max_object_size)
if (max_size == 0 || object_size > max_size)
return false;
return true;
@ -100,6 +104,11 @@ static void *cache_store(git_cache *cache, git_cached_obj *entry)
{
khiter_t pos;
git_cached_obj_incref(entry);
if (!cache_should_store(entry->type, entry->size))
return entry;
if (git_mutex_lock(&cache->lock) < 0)
return entry;
@ -114,6 +123,7 @@ static void *cache_store(git_cache *cache, git_cached_obj *entry)
kh_key(cache->map, pos) = &entry->oid;
kh_val(cache->map, pos) = entry;
git_cached_obj_incref(entry);
cache->used_memory += entry->size;
}
}
/* found */
@ -142,22 +152,12 @@ static void *cache_store(git_cache *cache, git_cached_obj *entry)
void *git_cache_store_raw(git_cache *cache, git_odb_object *entry)
{
git_cached_obj_incref(entry);
if (!cache_should_store(entry->cached.type, entry->cached.size))
return entry;
entry->cached.flags = GIT_CACHE_STORE_RAW;
return cache_store(cache, (git_cached_obj *)entry);
}
void *git_cache_store_parsed(git_cache *cache, git_object *entry)
{
git_cached_obj_incref(entry);
if (!cache_should_store(entry->cached.type, entry->cached.size))
return entry;
entry->cached.flags = GIT_CACHE_STORE_PARSED;
return cache_store(cache, (git_cached_obj *)entry);
}

1
src/cache.h
View File

@ -31,6 +31,7 @@ typedef struct {
typedef struct {
git_oidmap *map;
git_mutex lock;
size_t used_memory;
} git_cache;
int git_cache_init(git_cache *cache);