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add experimental.arenas_create_ext mallctl

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This mallctl accepts an arena_config_t structure which
can be used to customize the behavior of the arena.
Right now it contains extent_hooks and a new option,
metadata_use_hooks, which controls whether the extent
hooks are also used for metadata allocation.

The medata_use_hooks option has two main use cases:

1. In heterogeneous memory systems, to avoid metadata
being placed on potentially slower memory.

2. Avoiding virtual memory from being leaked as a result
of metadata allocation failure originating in an extent hook.
This commit is contained in:
Piotr Balcer 2021-08-23 14:03:35 +02:00 • committed by Qi Wang
parent a9031a0970
commit 7bb05e04be
17 changed files with 165 additions and 41 deletions
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14
src/jemalloc.c
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@ -384,7 +384,7 @@ narenas_total_get(void) {
/* Create a new arena and insert it into the arenas array at index ind. */
static arena_t *
arena_init_locked(tsdn_t *tsdn, unsigned ind, extent_hooks_t *extent_hooks) {
arena_init_locked(tsdn_t *tsdn, unsigned ind, const arena_config_t *config) {
arena_t *arena;
assert(ind <= narenas_total_get());
@ -406,7 +406,7 @@ arena_init_locked(tsdn_t *tsdn, unsigned ind, extent_hooks_t *extent_hooks) {
}
/* Actually initialize the arena. */
arena = arena_new(tsdn, ind, extent_hooks);
arena = arena_new(tsdn, ind, config);
return arena;
}
@ -430,11 +430,11 @@ arena_new_create_background_thread(tsdn_t *tsdn, unsigned ind) {
}
arena_t *
arena_init(tsdn_t *tsdn, unsigned ind, extent_hooks_t *extent_hooks) {
arena_init(tsdn_t *tsdn, unsigned ind, const arena_config_t *config) {
arena_t *arena;
malloc_mutex_lock(tsdn, &arenas_lock);
arena = arena_init_locked(tsdn, ind, extent_hooks);
arena = arena_init_locked(tsdn, ind, config);
malloc_mutex_unlock(tsdn, &arenas_lock);
arena_new_create_background_thread(tsdn, ind);
@ -570,8 +570,7 @@ arena_choose_hard(tsd_t *tsd, bool internal) {
choose[j] = first_null;
arena = arena_init_locked(tsd_tsdn(tsd),
choose[j],
(extent_hooks_t *)
&ehooks_default_extent_hooks);
&arena_config_default);
if (arena == NULL) {
malloc_mutex_unlock(tsd_tsdn(tsd),
&arenas_lock);
@ -1779,8 +1778,7 @@ malloc_init_hard_a0_locked() {
* Initialize one arena here. The rest are lazily created in
* arena_choose_hard().
*/
if (arena_init(TSDN_NULL, 0,
(extent_hooks_t *)&ehooks_default_extent_hooks) == NULL) {
if (arena_init(TSDN_NULL, 0, &arena_config_default) == NULL) {
return true;
}
a0 = arena_get(TSDN_NULL, 0, false);