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Fix background_thread creation for the oversize_arena.

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Bypassing background thread creation for the oversize_arena used to be an
optimization since that arena had eager purging.  However #2466 changed the
purging policy for the oversize_arena -- specifically it switched to the default
decay time when background_thread is enabled.

This issue is noticable when the number of arenas is low: whenever the total #
of arenas is <= 4 (which is the default max # of background threads), in which
case the purging will be stalled since no background thread is created for the
oversize_arena.
This commit is contained in:
Qi Wang 2024-05-02 12:53:42 -07:00 • committed by Qi Wang
parent 47d69b4eab
commit 8d8379da44
4 changed files with 2 additions and 25 deletions
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7
src/jemalloc.c
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@ -430,11 +430,8 @@ arena_new_create_background_thread(tsdn_t *tsdn, unsigned ind) {
if (ind == 0) {
return;
}
/*
* Avoid creating a new background thread just for the huge arena, which
* purges eagerly by default.
*/
if (have_background_thread && !arena_is_huge(ind)) {
if (have_background_thread) {
if (background_thread_create(tsdn_tsd(tsdn), ind)) {
malloc_printf("<jemalloc>: error in background thread "
"creation for arena %u. Abort.\n", ind);