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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/slab.c
+17 -20
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@@ -1,5 +1,6 @@
#include <kernel/slab.h>
#include <kernel/vmm.h>
#include <kernel/pmm.h>
#include <logging.h>
#include <util.h>
@@ -53,20 +54,21 @@ static void initindirect(scache_t *cache, slab_t *slab, void **base, void *objba
}
static bool growcache(scache_t *cache) {
void *_slab = vmm_map(NULL, PAGE_SIZE, VMM_FLAGS_ALLOCATE, ARCH_MMU_FLAGS_READ | ARCH_MMU_FLAGS_WRITE | ARCH_MMU_FLAGS_NOEXEC, NULL);
void *_slab = pmm_allocpage(PMM_SECTION_DEFAULT);
if (_slab == NULL)
return false;
slab_t *slab = GET_SLAB(_slab);
slab_t *slab = MAKE_HHDM(GET_SLAB(_slab));
if (cache->size < SLAB_INDIRECT_CUTOFF) {
initdirect(cache, slab, _slab);
initdirect(cache, slab, MAKE_HHDM(_slab));
} else {
void *base = vmm_map(NULL, cache->slabobjcount * cache->truesize, VMM_FLAGS_ALLOCATE, ARCH_MMU_FLAGS_READ | ARCH_MMU_FLAGS_WRITE | ARCH_MMU_FLAGS_NOEXEC, NULL);
if (base == NULL) {
vmm_unmap(_slab, PAGE_SIZE, 0);
pmm_release(_slab);
return false;
}
initindirect(cache, slab, _slab, base);
initindirect(cache, slab, MAKE_HHDM(_slab), base);
}
@@ -144,22 +146,20 @@ static slab_t *returnobject(scache_t *cache, void *obj) {
void *slab_allocate(scache_t *cache) {
MUTEX_ACQUIRE(&cache->mutex);
slab_t *slab = NULL;
if (cache->partial != NULL)
slab = cache->partial;
else if (cache->empty != NULL)
slab_t *slab = cache->partial;
if (slab == NULL)
slab = cache->empty;
void *ret = NULL;
if (slab == NULL) {
if (growcache(cache))
if (growcache(cache)) {
slab = cache->empty;
else
goto cleanup;
} else {
MUTEX_RELEASE(&cache->mutex);
return NULL;
}
}
ret = takeobject(cache, slab);
void *ret = takeobject(cache, slab);
if (slab == cache->empty) {
cache->empty = slab->next;
@@ -186,7 +186,6 @@ void *slab_allocate(scache_t *cache) {
cache->full = slab;
}
cleanup:
MUTEX_RELEASE(&cache->mutex);
return ret;
}
@@ -211,9 +210,7 @@ void slab_free(scache_t *cache, void *addr) {
if (slab->next)
slab->next->prev = slab;
cache->empty = slab;
}
if (slab->used == cache->slabobjcount - 1) {
} else if (slab->used == cache->slabobjcount - 1) {
if (slab->prev == NULL)
cache->full = slab->next;
else
@@ -274,7 +271,7 @@ static size_t purge(scache_t *cache, size_t maxcount){
if (cache->size >= SLAB_INDIRECT_CUTOFF)
vmm_unmap(slab->base, cache->slabobjcount * cache->truesize, 0);
vmm_unmap(slab, PAGE_SIZE, 0);
pmm_release(FROM_HHDM((void *)ROUND_DOWN((uintptr_t)slab, PAGE_SIZE)));
slab = cache->empty;
cache->empty = next;