Change opt.metadata_thp to [disabled,auto,always].
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.
diff --git a/src/ctl.c b/src/ctl.c
index c299103..ace10b0 100644
--- a/src/ctl.c
+++ b/src/ctl.c
@@ -1570,7 +1570,8 @@
CTL_RO_NL_GEN(opt_abort, opt_abort, bool)
CTL_RO_NL_GEN(opt_abort_conf, opt_abort_conf, bool)
-CTL_RO_NL_GEN(opt_metadata_thp, opt_metadata_thp, bool)
+CTL_RO_NL_GEN(opt_metadata_thp, metadata_thp_mode_names[opt_metadata_thp],
+ const char *)
CTL_RO_NL_GEN(opt_retain, opt_retain, bool)
CTL_RO_NL_GEN(opt_dss, opt_dss, const char *)
CTL_RO_NL_GEN(opt_narenas, opt_narenas, unsigned)