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Mallctl: Add arenas.lookup

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Implement a new mallctl operation that allows looking up the arena a
region of memory belongs to.
This commit is contained in:
Latchesar Ionkov
2018-05-01 12:31:09 -06:00
committed by Qi Wang
parent 6df90600a7
commit a32b7bd567
3 changed files with 59 additions and 1 deletions
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17
test/unit/mallctl.c
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@@ -738,6 +738,22 @@ TEST_BEGIN(test_arenas_create) {
}
TEST_END
TEST_BEGIN(test_arenas_lookup) {
unsigned arena, arena1;
void *ptr;
size_t sz = sizeof(unsigned);
assert_d_eq(mallctl("arenas.create", (void *)&arena, &sz, NULL, 0), 0,
"Unexpected mallctl() failure");
ptr = mallocx(42, MALLOCX_ARENA(arena) | MALLOCX_TCACHE_NONE);
assert_ptr_not_null(ptr, "Unexpected mallocx() failure");
assert_d_eq(mallctl("arenas.lookup", &arena1, &sz, &ptr, sizeof(ptr)),
0, "Unexpected mallctl() failure");
assert_u_eq(arena, arena1, "Unexpected arena index");
dallocx(ptr, 0);
}
TEST_END
TEST_BEGIN(test_stats_arenas) {
#define TEST_STATS_ARENAS(t, name) do { \
t name; \
@@ -784,5 +800,6 @@ main(void) {
test_arenas_bin_constants,
test_arenas_lextent_constants,
test_arenas_create,
test_arenas_lookup,
test_stats_arenas);
}