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Change opt.metadata_thp to [disabled,auto,always].

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To avoid the high RSS caused by THP + low usage arena (i.e. THP becomes a
significant percentage), added a new "auto" option which will only start using
THP after a base allocator used up the first THP region.  Starting from the
second hugepage (in a single arena), "auto" behaves the same as "always",
i.e. madvise hugepage right away.
This commit is contained in:
Qi Wang 2017-08-24 14:29:28 -07:00 • committed by Qi Wang
parent ea91dfa58e
commit 47b20bb654
10 changed files with 84 additions and 25 deletions
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2
src/pages.c
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@ -418,7 +418,7 @@ os_overcommits_proc(void) {
static void
init_thp_state(void) {
if (!have_madvise_huge) {
if (opt_metadata_thp && opt_abort) {
if (metadata_thp_enabled() && opt_abort) {
malloc_write("<jemalloc>: no MADV_HUGEPAGE support\n");
abort();
}