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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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7
test/unit/base.c
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@@ -32,7 +32,8 @@ TEST_BEGIN(test_base_hooks_default) {
tsdn_t *tsdn = tsd_tsdn(tsd_fetch());
base = base_new(tsdn, 0,
(extent_hooks_t *)&ehooks_default_extent_hooks);
(extent_hooks_t *)&ehooks_default_extent_hooks,
/* metadata_use_hooks */ true);
if (config_stats) {
base_stats_get(tsdn, base, &allocated0, &resident, &mapped,
@@ -74,7 +75,7 @@ TEST_BEGIN(test_base_hooks_null) {
memcpy(&hooks, &hooks_null, sizeof(extent_hooks_t));
tsdn_t *tsdn = tsd_tsdn(tsd_fetch());
base = base_new(tsdn, 0, &hooks);
base = base_new(tsdn, 0, &hooks, /* metadata_use_hooks */ true);
expect_ptr_not_null(base, "Unexpected base_new() failure");
if (config_stats) {
@@ -120,7 +121,7 @@ TEST_BEGIN(test_base_hooks_not_null) {
tsdn_t *tsdn = tsd_tsdn(tsd_fetch());
did_alloc = false;
base = base_new(tsdn, 0, &hooks);
base = base_new(tsdn, 0, &hooks, /* metadata_use_hooks */ true);
expect_ptr_not_null(base, "Unexpected base_new() failure");
expect_true(did_alloc, "Expected alloc");