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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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21
src/base.c
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@ -295,6 +295,12 @@ base_block_alloc(tsdn_t *tsdn, base_t *base, ehooks_t *ehooks, unsigned ind,
return block;
}
static ehooks_t *
base_ehooks_get_for_metadata(base_t *base) {
return base->metadata_use_hooks ? &base->ehooks :
(struct ehooks_s *)&ehooks_default_extent_hooks;
}
/*
* Allocate an extent that is at least as large as specified size, with
* specified alignment.
@ -303,7 +309,7 @@ static edata_t *
base_extent_alloc(tsdn_t *tsdn, base_t *base, size_t size, size_t alignment) {
malloc_mutex_assert_owner(tsdn, &base->mtx);
ehooks_t *ehooks = base_ehooks_get(base);
ehooks_t *ehooks = base_ehooks_get_for_metadata(base);
/*
* Drop mutex during base_block_alloc(), because an extent hook will be
* called.
@ -342,7 +348,8 @@ b0get(void) {
}
base_t *
base_new(tsdn_t *tsdn, unsigned ind, const extent_hooks_t *extent_hooks) {
base_new(tsdn_t *tsdn, unsigned ind, const extent_hooks_t *extent_hooks,
bool metadata_use_hooks) {
pszind_t pind_last = 0;
size_t extent_sn_next = 0;
@ -352,7 +359,9 @@ base_new(tsdn_t *tsdn, unsigned ind, const extent_hooks_t *extent_hooks) {
* memory, and then initialize the ehooks within the base_t.
*/
ehooks_t fake_ehooks;
ehooks_init(&fake_ehooks, (extent_hooks_t *)extent_hooks, ind);
ehooks_init(&fake_ehooks, metadata_use_hooks ?
(extent_hooks_t *)extent_hooks :
(extent_hooks_t *)&ehooks_default_extent_hooks, ind);
base_block_t *block = base_block_alloc(tsdn, NULL, &fake_ehooks, ind,
&pind_last, &extent_sn_next, sizeof(base_t), QUANTUM);
@ -375,6 +384,7 @@ base_new(tsdn_t *tsdn, unsigned ind, const extent_hooks_t *extent_hooks) {
base->extent_sn_next = extent_sn_next;
base->blocks = block;
base->auto_thp_switched = false;
base->metadata_use_hooks = metadata_use_hooks;
for (szind_t i = 0; i < SC_NSIZES; i++) {
edata_heap_new(&base->avail[i]);
}
@ -397,7 +407,7 @@ base_new(tsdn_t *tsdn, unsigned ind, const extent_hooks_t *extent_hooks) {
void
base_delete(tsdn_t *tsdn, base_t *base) {
ehooks_t *ehooks = base_ehooks_get(base);
ehooks_t *ehooks = base_ehooks_get_for_metadata(base);
base_block_t *next = base->blocks;
do {
base_block_t *block = next;
@ -512,6 +522,7 @@ base_postfork_child(tsdn_t *tsdn, base_t *base) {
bool
base_boot(tsdn_t *tsdn) {
b0 = base_new(tsdn, 0, (extent_hooks_t *)&ehooks_default_extent_hooks);
b0 = base_new(tsdn, 0,
(extent_hooks_t *)&ehooks_default_extent_hooks, true);
return (b0 == NULL);
}