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#include "test/jemalloc_test.h"
#include "test/sleep.h"
static void
sleep_for_background_thread_interval() {
/*
* The sleep interval set in our .sh file is 50ms. So it likely will
* run if we sleep for four times that.
*/
sleep_ns(200 * 1000 * 1000);
}
static unsigned
create_arena() {
unsigned arena_ind;
size_t sz;
sz = sizeof(unsigned);
expect_d_eq(mallctl("arenas.create", (void *)&arena_ind, &sz, NULL, 2),
0, "Unexpected mallctl() failure");
return arena_ind;
}
static size_t
get_empty_ndirty(unsigned arena_ind) {
int err;
size_t ndirty_huge;
size_t ndirty_nonhuge;
uint64_t epoch = 1;
size_t sz = sizeof(epoch);
err = je_mallctl("epoch", (void *)&epoch, &sz, (void *)&epoch,
sizeof(epoch));
expect_d_eq(0, err, "Unexpected mallctl() failure");
size_t mib[6];
size_t miblen = sizeof(mib)/sizeof(mib[0]);
err = mallctlnametomib(
"stats.arenas.0.hpa_shard.empty_slabs.ndirty_nonhuge", mib,
&miblen);
expect_d_eq(0, err, "Unexpected mallctlnametomib() failure");
sz = sizeof(ndirty_nonhuge);
mib[2] = arena_ind;
err = mallctlbymib(mib, miblen, &ndirty_nonhuge, &sz, NULL, 0);
expect_d_eq(0, err, "Unexpected mallctlbymib() failure");
err = mallctlnametomib(
"stats.arenas.0.hpa_shard.empty_slabs.ndirty_huge", mib,
&miblen);
expect_d_eq(0, err, "Unexpected mallctlnametomib() failure");
sz = sizeof(ndirty_huge);
mib[2] = arena_ind;
err = mallctlbymib(mib, miblen, &ndirty_huge, &sz, NULL, 0);
expect_d_eq(0, err, "Unexpected mallctlbymib() failure");
return ndirty_huge + ndirty_nonhuge;
}
static void
set_background_thread_enabled(bool enabled) {
int err;
err = je_mallctl("background_thread", NULL, NULL, &enabled,
sizeof(enabled));
expect_d_eq(0, err, "Unexpected mallctl failure");
}
static void
wait_until_thread_is_enabled(unsigned arena_id) {
tsd_t* tsd = tsd_fetch();
bool sleeping = false;
int iterations = 0;
do {
background_thread_info_t *info =
background_thread_info_get(arena_id);
malloc_mutex_lock(tsd_tsdn(tsd), &info->mtx);
malloc_mutex_unlock(tsd_tsdn(tsd), &info->mtx);
sleeping = background_thread_indefinite_sleep(info);
assert_d_lt(iterations, UINT64_C(1000000),
"Waiting for a thread to start for too long");
} while (!sleeping);
}
static void
expect_purging(unsigned arena_ind, bool expect_deferred) {
size_t empty_ndirty;
empty_ndirty = get_empty_ndirty(arena_ind);
expect_zu_eq(0, empty_ndirty, "Expected arena to start unused.");
/*
* It's possible that we get unlucky with our stats collection timing,
* and the background thread runs in between the deallocation and the
* stats collection. So we retry 10 times, and see if we *ever* see
* deferred reclamation.
*/
bool observed_dirty_page = false;
for (int i = 0; i < 10; i++) {
void *ptr = mallocx(PAGE,
MALLOCX_TCACHE_NONE | MALLOCX_ARENA(arena_ind));
empty_ndirty = get_empty_ndirty(arena_ind);
expect_zu_eq(0, empty_ndirty, "All pages should be active");
dallocx(ptr, MALLOCX_TCACHE_NONE);
empty_ndirty = get_empty_ndirty(arena_ind);
if (expect_deferred) {
expect_true(empty_ndirty == 0 || empty_ndirty == 1 ||
opt_prof, "Unexpected extra dirty page count: %zu",
empty_ndirty);
} else {
assert_zu_eq(0, empty_ndirty,
"Saw dirty pages without deferred purging");
}
if (empty_ndirty > 0) {
observed_dirty_page = true;
break;
}
}
expect_b_eq(expect_deferred, observed_dirty_page, "");
/*
* Under high concurrency / heavy test load (e.g. using run_test.sh),
* the background thread may not get scheduled for a longer period of
* time. Retry 100 times max before bailing out.
*/
unsigned retry = 0;
while ((empty_ndirty = get_empty_ndirty(arena_ind)) > 0 &&
expect_deferred && (retry++ < 100)) {
sleep_for_background_thread_interval();
}
expect_zu_eq(0, empty_ndirty, "Should have seen a background purge");
}
TEST_BEGIN(test_hpa_background_thread_purges) {
test_skip_if(!config_stats);
test_skip_if(!hpa_supported());
test_skip_if(!have_background_thread);
/* Skip since guarded pages cannot be allocated from hpa. */
test_skip_if(san_guard_enabled());
unsigned arena_ind = create_arena();
/*
* Our .sh sets dirty mult to 0, so all dirty pages should get purged
* any time any thread frees.
*/
expect_purging(arena_ind, /* expect_deferred */ true);
}
TEST_END
TEST_BEGIN(test_hpa_background_thread_enable_disable) {
test_skip_if(!config_stats);
test_skip_if(!hpa_supported());
test_skip_if(!have_background_thread);
/* Skip since guarded pages cannot be allocated from hpa. */
test_skip_if(san_guard_enabled());
unsigned arena_ind = create_arena();
set_background_thread_enabled(false);
expect_purging(arena_ind, false);
set_background_thread_enabled(true);
wait_until_thread_is_enabled(arena_ind);
expect_purging(arena_ind, true);
}
TEST_END
int
main(void) {
/*
* OK, this is a sort of nasty hack. We don't want to add *another*
* config option for HPA (the intent is that it becomes available on
* more platforms over time, and we're trying to prune back config
* options generally. But we'll get initialization errors on other
* platforms if we set hpa:true in the MALLOC_CONF (even if we set
* abort_conf:false as well). So we reach into the internals and set
* them directly, but only if we know that we're actually going to do
* something nontrivial in the tests.
*/
if (config_stats && hpa_supported() && have_background_thread) {
opt_hpa = true;
opt_background_thread = true;
}
return test_no_reentrancy(
test_hpa_background_thread_purges,
test_hpa_background_thread_enable_disable);
}
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