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Add "thread.idle" mallctl.

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This can encapsulate various internal cleaning logic, and can be used to free up
resources before a long sleep.
This commit is contained in:
David Goldblatt
2020-01-22 11:13:26 -08:00
committed by David Goldblatt
parent f81341a48b
commit 6a622867ca
3 changed files with 137 additions and 2 deletions
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72
test/unit/mallctl.c
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@@ -882,6 +882,75 @@ TEST_BEGIN(test_hooks_exhaustion) {
}
TEST_END
TEST_BEGIN(test_thread_idle) {
/*
* We're cheating a little bit in this test, and inferring things about
* implementation internals (like tcache details). We have to;
* thread.idle has no guaranteed effects. We need stats to make these
* inferences.
*/
test_skip_if(!config_stats);
int err;
size_t sz;
size_t miblen;
bool tcache_enabled = false;
sz = sizeof(tcache_enabled);
err = mallctl("thread.tcache.enabled", &tcache_enabled, &sz, NULL, 0);
assert_d_eq(err, 0, "");
test_skip_if(!tcache_enabled);
size_t tcache_max;
sz = sizeof(tcache_max);
err = mallctl("arenas.tcache_max", &tcache_max, &sz, NULL, 0);
assert_d_eq(err, 0, "");
test_skip_if(tcache_max == 0);
unsigned arena_ind;
sz = sizeof(arena_ind);
err = mallctl("thread.arena", &arena_ind, &sz, NULL, 0);
assert_d_eq(err, 0, "");
/* We're going to do an allocation of size 1, which we know is small. */
size_t mib[5];
miblen = sizeof(mib)/sizeof(mib[0]);
err = mallctlnametomib("stats.arenas.0.small.ndalloc", mib, &miblen);
assert_d_eq(err, 0, "");
mib[2] = arena_ind;
/*
* This alloc and dalloc should leave something in the tcache, in a
* small size's cache bin.
*/
void *ptr = mallocx(1, 0);
dallocx(ptr, 0);
uint64_t epoch;
err = mallctl("epoch", NULL, NULL, &epoch, sizeof(epoch));
assert_d_eq(err, 0, "");
uint64_t small_dalloc_pre_idle;
sz = sizeof(small_dalloc_pre_idle);
err = mallctlbymib(mib, miblen, &small_dalloc_pre_idle, &sz, NULL, 0);
assert_d_eq(err, 0, "");
err = mallctl("thread.idle", NULL, NULL, NULL, 0);
assert_d_eq(err, 0, "");
err = mallctl("epoch", NULL, NULL, &epoch, sizeof(epoch));
assert_d_eq(err, 0, "");
uint64_t small_dalloc_post_idle;
sz = sizeof(small_dalloc_post_idle);
err = mallctlbymib(mib, miblen, &small_dalloc_post_idle, &sz, NULL, 0);
assert_d_eq(err, 0, "");
assert_u64_lt(small_dalloc_pre_idle, small_dalloc_post_idle,
"Purge didn't flush the tcache");
}
TEST_END
int
main(void) {
return test(
@@ -913,5 +982,6 @@ main(void) {
test_prof_active,
test_stats_arenas,
test_hooks,
test_hooks_exhaustion);
test_hooks_exhaustion,
test_thread_idle);
}