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selftests/perf_events: Add a SIGTRAP stress test with disables

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Add a SIGTRAP stress test that exercises repeatedly enabling/disabling
an event while it concurrently keeps firing.

Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/all/Y0E3uG7jOywn7vy3@elver.google.com/
This commit is contained in:
Marco Elver 2022-10-11 14:45:35 +02:00 committed by Peter Zijlstra
parent ca6c21327c
commit 23488ec668
1 changed files with 32 additions and 3 deletions
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35
tools/testing/selftests/perf_events/sigtrap_threads.c
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@ -62,6 +62,8 @@ static struct perf_event_attr make_event_attr(bool enabled, volatile void *addr,
.remove_on_exec = 1, /* Required by sigtrap. */
.sigtrap = 1, /* Request synchronous SIGTRAP on event. */
.sig_data = TEST_SIG_DATA(addr, id),
.exclude_kernel = 1, /* To allow */
.exclude_hv = 1, /* running as !root */
};
return attr;
}
@ -93,9 +95,13 @@ static void *test_thread(void *arg)
__atomic_fetch_add(&ctx.tids_want_signal, tid, __ATOMIC_RELAXED);
iter = ctx.iterate_on; /* read */
for (i = 0; i < iter - 1; i++) {
__atomic_fetch_add(&ctx.tids_want_signal, tid, __ATOMIC_RELAXED);
ctx.iterate_on = iter; /* idempotent write */
if (iter >= 0) {
for (i = 0; i < iter - 1; i++) {
__atomic_fetch_add(&ctx.tids_want_signal, tid, __ATOMIC_RELAXED);
ctx.iterate_on = iter; /* idempotent write */
}
} else {
while (ctx.iterate_on);
}
return NULL;
@ -208,4 +214,27 @@ TEST_F(sigtrap_threads, signal_stress)
EXPECT_EQ(ctx.first_siginfo.si_perf_data, TEST_SIG_DATA(&ctx.iterate_on, 0));
}
TEST_F(sigtrap_threads, signal_stress_with_disable)
{
const int target_count = NUM_THREADS * 3000;
int i;
ctx.iterate_on = -1;
EXPECT_EQ(ioctl(self->fd, PERF_EVENT_IOC_ENABLE, 0), 0);
pthread_barrier_wait(&self->barrier);
while (__atomic_load_n(&ctx.signal_count, __ATOMIC_RELAXED) < target_count) {
EXPECT_EQ(ioctl(self->fd, PERF_EVENT_IOC_DISABLE, 0), 0);
EXPECT_EQ(ioctl(self->fd, PERF_EVENT_IOC_ENABLE, 0), 0);
}
ctx.iterate_on = 0;
for (i = 0; i < NUM_THREADS; i++)
ASSERT_EQ(pthread_join(self->threads[i], NULL), 0);
EXPECT_EQ(ioctl(self->fd, PERF_EVENT_IOC_DISABLE, 0), 0);
EXPECT_EQ(ctx.first_siginfo.si_addr, &ctx.iterate_on);
EXPECT_EQ(ctx.first_siginfo.si_perf_type, PERF_TYPE_BREAKPOINT);
EXPECT_EQ(ctx.first_siginfo.si_perf_data, TEST_SIG_DATA(&ctx.iterate_on, 0));
}
TEST_HARNESS_MAIN