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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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53
test/integration/extent.c
View File

@@ -2,6 +2,8 @@
#include "test/extent_hooks.h"
#include "jemalloc/internal/arena_types.h"
static void
test_extent_body(unsigned arena_ind) {
void *p;
@@ -228,9 +230,58 @@ TEST_BEGIN(test_extent_auto_hook) {
}
TEST_END
static void
test_arenas_create_ext_base(arena_config_t config,
bool expect_hook_data, bool expect_hook_metadata)
{
unsigned arena, arena1;
void *ptr;
size_t sz = sizeof(unsigned);
extent_hooks_prep();
called_alloc = false;
expect_d_eq(mallctl("experimental.arenas_create_ext",
(void *)&arena, &sz, &config, sizeof(arena_config_t)), 0,
"Unexpected mallctl() failure");
expect_b_eq(called_alloc, expect_hook_metadata,
"expected hook metadata alloc mismatch");
called_alloc = false;
ptr = mallocx(42, MALLOCX_ARENA(arena) | MALLOCX_TCACHE_NONE);
expect_b_eq(called_alloc, expect_hook_data,
"expected hook data alloc mismatch");
expect_ptr_not_null(ptr, "Unexpected mallocx() failure");
expect_d_eq(mallctl("arenas.lookup", &arena1, &sz, &ptr, sizeof(ptr)),
0, "Unexpected mallctl() failure");
expect_u_eq(arena, arena1, "Unexpected arena index");
dallocx(ptr, 0);
}
TEST_BEGIN(test_arenas_create_ext_with_ehooks_no_metadata) {
arena_config_t config;
config.extent_hooks = &hooks;
config.metadata_use_hooks = false;
test_arenas_create_ext_base(config, true, false);
}
TEST_END
TEST_BEGIN(test_arenas_create_ext_with_ehooks_with_metadata) {
arena_config_t config;
config.extent_hooks = &hooks;
config.metadata_use_hooks = true;
test_arenas_create_ext_base(config, true, true);
}
TEST_END
int
main(void) {
return test(
test_extent_manual_hook,
test_extent_auto_hook);
test_extent_auto_hook,
test_arenas_create_ext_with_ehooks_no_metadata,
test_arenas_create_ext_with_ehooks_with_metadata);
}