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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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4
test/unit/sec.c
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@ -42,7 +42,7 @@ test_sec_init(sec_t *sec, pai_t *fallback, size_t nshards, size_t max_alloc,
* short-running, and SECs are arena-scoped in reality.
*/
base_t *base = base_new(TSDN_NULL, /* ind */ 123,
&ehooks_default_extent_hooks);
&ehooks_default_extent_hooks, /* metadata_use_hooks */ true);
bool err = sec_init(TSDN_NULL, sec, base, fallback, &opts);
assert_false(err, "Unexpected initialization failure");
@ -442,7 +442,7 @@ TEST_BEGIN(test_nshards_0) {
/* See the note above -- we can't use the real tsd. */
tsdn_t *tsdn = TSDN_NULL;
base_t *base = base_new(TSDN_NULL, /* ind */ 123,
&ehooks_default_extent_hooks);
&ehooks_default_extent_hooks, /* metadata_use_hooks */ true);
sec_opts_t opts = SEC_OPTS_DEFAULT;
opts.nshards = 0;