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Avoid creating bg thds for huge arena lone.

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For low arena count settings, the huge threshold feature may trigger an unwanted
bg thd creation.  Given that the huge arena does eager purging by default,
bypass bg thd creation when initializing the huge arena.
This commit is contained in:
Qi Wang 2019-01-14 14:16:09 -08:00 • committed by Qi Wang
parent b6f1f2669a
commit bbe8e6a909
5 changed files with 43 additions and 15 deletions
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20
src/background_thread.c
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@ -535,9 +535,8 @@ background_thread_init(tsd_t *tsd, background_thread_info_t *info) {
n_background_threads++;
}
/* Create a new background thread if needed. */
bool
background_thread_create(tsd_t *tsd, unsigned arena_ind) {
static bool
background_thread_create_locked(tsd_t *tsd, unsigned arena_ind) {
assert(have_background_thread);
malloc_mutex_assert_owner(tsd_tsdn(tsd), &background_thread_lock);
@ -590,6 +589,19 @@ background_thread_create(tsd_t *tsd, unsigned arena_ind) {
return false;
}
/* Create a new background thread if needed. */
bool
background_thread_create(tsd_t *tsd, unsigned arena_ind) {
assert(have_background_thread);
bool ret;
malloc_mutex_lock(tsd_tsdn(tsd), &background_thread_lock);
ret = background_thread_create_locked(tsd, arena_ind);
malloc_mutex_unlock(tsd_tsdn(tsd), &background_thread_lock);
return ret;
}
bool
background_threads_enable(tsd_t *tsd) {
assert(n_background_threads == 0);
@ -623,7 +635,7 @@ background_threads_enable(tsd_t *tsd) {
}
}
return background_thread_create(tsd, 0);
return background_thread_create_locked(tsd, 0);
}
bool