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Redesign the cache bin metadata for fast path.

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Implement the pointer-based metadata for tcache bins --
- 3 pointers are maintained to represent each bin;
- 2 of the pointers are compressed on 64-bit;
- is_full / is_empty done through pointer comparison;

Comparing to the previous counter based design --
- fast-path speed up ~15% in benchmarks
- direct pointer comparison and de-reference
- no need to access tcache_bin_info in common case
This commit is contained in:
Qi Wang 2019-08-09 22:12:47 -07:00 • committed by Qi Wang
parent d2dddfb82a
commit 7599c82d48
9 changed files with 340 additions and 122 deletions
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5
src/jemalloc.c
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@ -2368,7 +2368,7 @@ je_malloc(size_t size) {
cache_bin_t *bin = tcache_small_bin_get(tcache, ind);
bool tcache_success;
void* ret = cache_bin_alloc_easy(bin, &tcache_success);
void *ret = cache_bin_alloc_easy(bin, &tcache_success, ind);
if (tcache_success) {
if (config_stats) {
@ -2846,8 +2846,7 @@ bool free_fastpath(void *ptr, size_t size, bool size_hint) {
}
cache_bin_t *bin = tcache_small_bin_get(tcache, alloc_ctx.szind);
cache_bin_info_t *bin_info = &tcache_bin_info[alloc_ctx.szind];
if (!cache_bin_dalloc_easy(bin, bin_info, ptr)) {
if (!cache_bin_dalloc_easy(bin, ptr)) {
return false;
}