jmb
/
hardened_malloc
mirror of https://github.com/GrapheneOS/hardened_malloc.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

tune slab metadata allocation

pull/50/head
Daniel Micay 2018-08-25 15:43:50 -04:00
parent 4777ee0c85
commit 7bcfa3f08b
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
malloc.c
View File

@ -206,7 +206,7 @@ static size_t get_metadata_max(size_t slab_size) {
} }
static struct slab_metadata *alloc_metadata(struct size_class *c, size_t slab_size) { static struct slab_metadata *alloc_metadata(struct size_class *c, size_t slab_size) {
if (c->metadata_count == c->metadata_allocated) { if (unlikely(c->metadata_count == c->metadata_allocated)) {
size_t metadata_max = get_metadata_max(slab_size); size_t metadata_max = get_metadata_max(slab_size);
if (c->metadata_count == metadata_max) { if (c->metadata_count == metadata_max) {
return NULL; return NULL;
@ -649,7 +649,7 @@ COLD static void init_slow_path(void) {
if (c->slab_info == NULL) { if (c->slab_info == NULL) {
fatal_error("failed to allocate slab metadata"); fatal_error("failed to allocate slab metadata");
} }
c->metadata_allocated = 32; c->metadata_allocated = PAGE_SIZE / sizeof(struct slab_metadata);
if (mprotect(c->slab_info, c->metadata_allocated * sizeof(struct slab_metadata), PROT_READ|PROT_WRITE)) { if (mprotect(c->slab_info, c->metadata_allocated * sizeof(struct slab_metadata), PROT_READ|PROT_WRITE)) {
fatal_error("failed to allocate initial slab info"); fatal_error("failed to allocate initial slab info");
} }