kselftest/arm64: Check that all children are producing output in fp-stress

Currently we don't have an explicit check that when it's been a second
since we have seen output produced from the test programs starting up that
means all of them are running and we should start both sending signals and
timing out. This is not reliable, especially on very heavily loaded systems
where the test programs might take longer than a second to run.

We do skip sending signals to children that have not produced output yet
so we won't cause them to exit unexpectedly by sending a signal but this
can create confusion when interpreting output, for example appearing to
show the tests running for less time than expected or appearing to show
missed signal deliveries. Avoid issues by explicitly checking that we have
seen output from all the child processes before we start sending signals
or counting test run time.

This is especially likely on virtual platforms with large numbers of vector
lengths supported since the platforms are slow and there will be a lot of
tasks per CPU.
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20221017144553.773176-2-broonie@kernel.orgSigned-off-by: Will Deacon <will@kernel.org>

tools/testing/selftests/arm64/fp/fp-stress.c

@@ -403,6 +403,8 @@ int main(int argc, char **argv)
 	int timeout = 10;
 	int cpus, tests, i, j, c;
 	int sve_vl_count, sme_vl_count, fpsimd_per_cpu;
+	bool all_children_started = false;
+	int seen_children;
 	int sve_vls[MAX_VLS], sme_vls[MAX_VLS];
 	struct epoll_event ev;
 	struct sigaction sa;
@@ -526,6 +528,27 @@ int main(int argc, char **argv)
 
 		/* Otherwise epoll_wait() timed out */
 
+		/*
+		 * If the child processes have not produced output they
+		 * aren't actually running the tests yet .
+		 */
+		if (!all_children_started) {
+			seen_children = 0;
+
+			for (i = 0; i < num_children; i++)
+				if (children[i].output_seen ||
+				    children[i].exited)
+					seen_children++;
+
+			if (seen_children != num_children) {
+				ksft_print_msg("Waiting for %d children\n",
+					       num_children - seen_children);
+				continue;
+			}
+
+			all_children_started = true;
+		}
+
 		for (i = 0; i < num_children; i++)
 			child_tickle(&children[i]);