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Pass surviving descriptor through jemalloc_postfork_child orchestrator

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The orchestrator looks up the surviving descriptor via
tcache_postfork_arena_descriptor and threads it into
arena_postfork_child, eliminating arena's call into tcache. Also reset
cache_bin_array_descriptor_ql_mtx right before the queue rebuild it
protects.
This commit is contained in:
Slobodan Predolac 2026-05-08 11:36:12 -07:00
parent 3cd9753e23
commit 88745978e9
5 changed files with 28 additions and 23 deletions
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21
src/tcache.c
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@ -754,21 +754,20 @@ tcache_arena_reassociate(tsdn_t *tsdn, tcache_slow_t *tcache_slow,
tcache_arena_associate(tsdn, tcache_slow, arena);
}
void
tcache_arena_postfork_child(tsdn_t *tsdn, arena_t *arena) {
cache_bin_array_descriptor_t *
tcache_postfork_arena_descriptor(tsdn_t *tsdn, arena_t *arena) {
if (!config_stats) {
return;
return NULL;
}
cache_bin_array_descriptor_t *desc = NULL;
tcache_slow_t *tcache_slow = tcache_slow_get(tsdn_tsd(tsdn));
if (tcache_slow != NULL && tcache_slow->arena == arena) {
assert(tcache_slow->tcache != NULL);
cache_bin_array_descriptor_init(
&tcache_slow->cache_bin_array_descriptor,
tcache_slow->tcache->bins);
desc = &tcache_slow->cache_bin_array_descriptor;
if (tcache_slow == NULL || tcache_slow->arena != arena) {
return NULL;
}
arena_cache_bin_array_postfork_child(arena, desc);
assert(tcache_slow->tcache != NULL);
cache_bin_array_descriptor_init(
&tcache_slow->cache_bin_array_descriptor,
tcache_slow->tcache->bins);
return &tcache_slow->cache_bin_array_descriptor;
}
static void