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Experimental calloc implementation with using memset on larger sizes

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Shirui Cheng 2024-04-03 13:27:11 -07:00 • committed by Qi Wang
parent 38056fea64
commit 5081c16bb4
3 changed files with 34 additions and 7 deletions
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35
src/arena.c
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@ -359,18 +359,39 @@ arena_extent_alloc_large(tsdn_t *tsdn, arena_t *arena, size_t usize,
bool guarded = san_large_extent_decide_guard(tsdn,
arena_get_ehooks(arena), esize, alignment);
edata_t *edata = pa_alloc(tsdn, &arena->pa_shard, esize, alignment,
/* slab */ false, szind, zero, guarded, &deferred_work_generated);
if (edata != NULL) {
if (config_stats) {
arena_large_malloc_stats_update(tsdn, arena, usize);
}
/*
* - if usize >= opt_calloc_madvise_threshold,
* - pa_alloc(..., zero_override = zero, ...)
* - otherwise,
* - pa_alloc(..., zero_override = false, ...)
* - use memset() to zero out memory if zero == true.
*/
bool zero_override = zero && (usize >= opt_calloc_madvise_threshold);
edata_t *edata = pa_alloc(tsdn, &arena->pa_shard, esize, alignment,
/* slab */ false, szind, zero_override, guarded,
&deferred_work_generated);
if (edata == NULL) {
return NULL;
}
if (edata != NULL && sz_large_pad != 0) {
if (config_stats) {
arena_large_malloc_stats_update(tsdn, arena, usize);
}
if (sz_large_pad != 0) {
arena_cache_oblivious_randomize(tsdn, arena, edata, alignment);
}
/*
* This branch should be put after the randomization so that the addr
* returned by edata_addr_get() has already be randomized,
* if cache_oblivious is enabled.
*/
if (zero && !zero_override && !edata_zeroed_get(edata)) {
void *addr = edata_addr_get(edata);
size_t usize = edata_usize_get(edata);
memset(addr, 0, usize);
}
return edata;
}