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Implement huge arena: opt.huge_threshold.

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The feature allows using a dedicated arena for huge allocations.  We want the
addtional arena to separate huge allocation because: 1) mixing small extents
with huge ones causes fragmentation over the long run (this feature reduces VM
size significantly); 2) with many arenas, huge extents rarely get reused across
threads; and 3) huge allocations happen way less frequently, therefore no
concerns for lock contention.
This commit is contained in:
Qi Wang
2018-05-21 13:33:48 -07:00
committed by Qi Wang
parent 77a71ef2b7
commit 94a88c26f4
8 changed files with 106 additions and 6 deletions
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13
src/jemalloc.c
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@@ -327,7 +327,7 @@ arena_init_locked(tsdn_t *tsdn, unsigned ind, extent_hooks_t *extent_hooks) {
*/
arena = arena_get(tsdn, ind, false);
if (arena != NULL) {
assert(ind < narenas_auto);
assert(arena_is_auto(arena));
return arena;
}
@@ -1142,11 +1142,15 @@ malloc_conf_init(void) {
CONF_HANDLE_BOOL(opt_xmalloc, "xmalloc")
}
CONF_HANDLE_BOOL(opt_tcache, "tcache")
CONF_HANDLE_SSIZE_T(opt_lg_tcache_max, "lg_tcache_max",
-1, (sizeof(size_t) << 3) - 1)
CONF_HANDLE_SIZE_T(opt_huge_threshold, "huge_threshold",
LARGE_MINCLASS, LARGE_MAXCLASS, yes, yes, false)
CONF_HANDLE_SIZE_T(opt_lg_extent_max_active_fit,
"lg_extent_max_active_fit", 0,
(sizeof(size_t) << 3), yes, yes, false)
CONF_HANDLE_SSIZE_T(opt_lg_tcache_max, "lg_tcache_max",
-1, (sizeof(size_t) << 3) - 1)
if (strncmp("percpu_arena", k, klen) == 0) {
bool match = false;
for (int i = percpu_arena_mode_names_base; i <
@@ -1465,6 +1469,9 @@ malloc_init_narenas(void) {
narenas_auto);
}
narenas_total_set(narenas_auto);
if (arena_init_huge()) {
narenas_total_inc();
}
return false;
}