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misc allocator optimisations

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Matheus
2025-02-15 20:32:29 -03:00
parent afaa10d6fa
commit 9bf5fb14c9
2 changed files with 29 additions and 38 deletions
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kernel-src/mm/alloc.c
+12 -18
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@@ -18,24 +18,18 @@
static size_t allocsizes[CACHE_COUNT] = {32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536};
static scache_t *caches[CACHE_COUNT + 5];
static void initarea(scache_t *cache, void *obj) {
static void initarea(scache_t *cache, void *obj, size_t size) {
size_t *ptr = obj;
*ptr = CAPACITY_SIZE(cache);
*(ptr + 1) = size;
memset(ptr + 2, 0, *ptr);
#if USE_POISON == 1
*((size_t *)((uintptr_t)obj + cache->size - sizeof(size_t))) = POISON_VALUE;
#endif
}
static void dtor(scache_t *cache, void *obj) {
#if USE_POISON == 1
__assert(*(size_t *)((uintptr_t)obj + cache->size - sizeof(size_t)) == POISON_VALUE);
#endif
initarea(cache, obj);
}
static scache_t *getcachefromsize(size_t size) {
if (size <= 1)
if (unlikely(size <= 1))
return caches[0];
size_t i = 64 - __builtin_clzll(size - 1);
@@ -45,21 +39,18 @@ static scache_t *getcachefromsize(size_t size) {
void *alloc(size_t size) {
scache_t *cache = getcachefromsize(size);
size_t *ret = slab_allocate(cache);
if (ret == NULL)
if (unlikely(ret == NULL))
return NULL;
initarea(cache, ret, size);
#if USE_POISON == 1
__assert(*ret == CAPACITY_SIZE(cache));
#endif
*(ret + 1) = size;
return ret + 2;
}
void free(void *ptr) {
size_t *start = ptr;
start -= 2;
size_t size = *start;
scache_t *cache = getcachefromsize(size);
slab_free(cache, start);
slab_free(getcachefromsize(*((size_t *)ptr - 2)), (size_t *)ptr - 2);
}
void *realloc(void *ptr, size_t size) {
@@ -87,7 +78,7 @@ void *realloc(void *ptr, size_t size) {
size_t *new = slab_allocate(newcache);
if (new == NULL)
return NULL;
*(new + 1) = size;
initarea(newcache, new, size);
memcpy((new + 2), ptr, currentsize);
slab_free(oldcache, start);
return new + 2;
@@ -95,8 +86,11 @@ void *realloc(void *ptr, size_t size) {
void alloc_init() {
for (int i = 0; i < CACHE_COUNT; ++i) {
caches[i + 5] = slab_newcache(allocsizes[i] + sizeof(size_t) * 2 + sizeof(size_t) * USE_POISON, 0, initarea, dtor);
caches[i + 5] = slab_newcache(allocsizes[i] + sizeof(size_t) * 2 + sizeof(size_t) * USE_POISON, 0, NULL, NULL);
__assert(caches[i + 5]);
void *p = slab_allocate(caches[i + 5]);
__assert(p);
slab_free(caches[i + 5], p);
}
for (int i = 0; i < 5; ++i)