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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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18
src/jemalloc.c
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@@ -1055,7 +1055,23 @@ malloc_conf_init(void) {
if (opt_abort_conf && had_conf_error) {
malloc_abort_invalid_conf();
}
CONF_HANDLE_BOOL(opt_metadata_thp, "metadata_thp")
if (strncmp("metadata_thp", k, klen) == 0) {
int i;
bool match = false;
for (i = 0; i < metadata_thp_mode_limit; i++) {
if (strncmp(metadata_thp_mode_names[i],
v, vlen) == 0) {
opt_metadata_thp = i;
match = true;
break;
}
}
if (!match) {
malloc_conf_error("Invalid conf value",
k, klen, v, vlen);
}
continue;
}
CONF_HANDLE_BOOL(opt_retain, "retain")
if (strncmp("dss", k, klen) == 0) {
int i;