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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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3
test/unit/pa.c
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@@ -53,7 +53,8 @@ test_data_t *init_test_data(ssize_t dirty_decay_ms, ssize_t muzzy_decay_ms) {
assert_ptr_not_null(test_data, "");
init_test_extent_hooks(&test_data->hooks);
base_t *base = base_new(TSDN_NULL, /* ind */ 1, &test_data->hooks);
base_t *base = base_new(TSDN_NULL, /* ind */ 1,
&test_data->hooks, /* metadata_use_hooks */ true);
assert_ptr_not_null(base, "");
test_data->base = base;