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Add PAC decay/deferral unit test coverage.

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Add unit tests to cover public interface of pac decay & deferral
relevant functions.  To align with the decopuling between arena and pac,
rename arena_decay to pac_decay here.
This commit is contained in:
guangli-dai 2026-06-28 15:29:38 -07:00
parent 3688de0623
commit 11f6e4ee91
5 changed files with 144 additions and 8 deletions
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57
test/unit/pac.c
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@ -2,6 +2,13 @@
#include "jemalloc/internal/pa.h"
/*
* pac_decay_deferred is JET_EXTERN (test-only; see src/pac.c) and has no public
* header declaration, so declare it locally for the deterministic test below.
*/
extern void pac_decay_deferred(tsdn_t *tsdn, pac_t *pac,
pac_purge_eagerness_t eagerness, pac_deferred_work_result_t *result);
#define PAC_TEST_ARENA_IND 124
static bool pac_test_dalloc_fail;
@ -114,12 +121,14 @@ pac_test_data_init(bool custom_hooks, ssize_t dirty_decay_ms,
nstime_t time;
nstime_init(&time, 0);
assert_false(pa_central_init(&data->central, data->base, /* hpa */ false,
&hpa_hooks_default), "Unexpected pa_central_init failure");
assert_false(pa_central_init(&data->central, data->base,
/* hpa */ false, &hpa_hooks_default),
"Unexpected pa_central_init failure");
assert_false(pa_shard_init(tsdn, &data->shard, &data->central,
&data->emap, data->base, PAC_TEST_ARENA_IND, &data->stats,
&data->stats_mtx, &time, SC_LARGE_MAXCLASS + PAGE,
dirty_decay_ms, muzzy_decay_ms), "Unexpected pa_shard_init failure");
dirty_decay_ms, muzzy_decay_ms),
"Unexpected pa_shard_init failure");
return data;
}
@ -382,6 +391,45 @@ TEST_BEGIN(test_pac_large_guarded_dalloc_unguards_before_caching) {
}
TEST_END
TEST_BEGIN(test_pac_deferred_never_does_not_purge) {
/*
* PAC_PURGE_NEVER is the eagerness the application free path selects
* when a background thread is enabled, meaning current thread does not
* purge. It is only reachable through the exposed pac_decay_deferred
* primitive (the production entry pac_do_deferred_work picks eagerness
* itself), so this is a deliberate internal test of that critical,
* stable edge.
*/
pac_test_hooks_reset();
/*
* Finite dirty decay so a purge is gated by eagerness, not decay_ms<=0.
*/
pac_test_data_t *data = pac_test_data_init(
/* custom_hooks */ true, /* dirty_decay_ms */ 100 * 1000, -1);
pac_t *pac = &data->shard.pac;
edata_t *edata = pac_alloc_expect(data, PAGE, /* guarded */ false);
size_t ndirty_before_dalloc = ecache_npages_get(&pac->ecache_dirty);
/* Dalloc caches the extent as dirty and requests deferred work. */
bool deferred_work_generated = false;
pac_dalloc(tsdn_fetch(), pac, edata, &deferred_work_generated);
expect_true(deferred_work_generated,
"Non-pinned dalloc should request deferred work");
size_t ndirty_after_dalloc = ecache_npages_get(&pac->ecache_dirty);
expect_zu_gt(ndirty_after_dalloc, ndirty_before_dalloc,
"Dalloc should add dirty pages");
/* PAC_PURGE_NEVER must leave the dirty pages untouched. */
pac_deferred_work_result_t result;
pac_decay_deferred(tsdn_fetch(), pac, PAC_PURGE_NEVER, &result);
expect_zu_eq(ecache_npages_get(&pac->ecache_dirty), ndirty_after_dalloc,
"PAC_PURGE_NEVER must not purge any dirty pages");
pac_test_data_destroy(data);
}
TEST_END
int
main(void) {
return test_no_reentrancy(test_pac_dirty_muzzy_alloc_priority,
@ -391,5 +439,6 @@ main(void) {
test_pac_decay_retains_when_dalloc_fails,
test_pac_non_pinned_dalloc_signals_deferred_work,
test_pac_non_pinned_shrink_signals_deferred_work,
test_pac_large_guarded_dalloc_unguards_before_caching);
test_pac_large_guarded_dalloc_unguards_before_caching,
test_pac_deferred_never_does_not_purge);
}