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Commit 28be3f8f authored by Greg Hackmann's avatar Greg Hackmann Committed by John Stultz
Browse files

kselftests: timers: set-timer-lat: Add one-shot timer test cases 



These testcases are motivated by a recent alarmtimer regression, which
caused one-shot CLOCK_{BOOTTIME,REALTIME}_ALARM timers to become
periodic timers.

The new testcases are very similar to the existing testcases for
repeating timers.  But rather than waiting for 5 alarms, they wait for 5
seconds and verify that the alarm fired exactly once.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Miroslav Lichvar <mlichvar@redhat.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Stephen Boyd <stephen.boyd@linaro.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: linux-kselftest@vger.kernel.org
Signed-off-by: default avatarGreg Hackmann <ghackmann@google.com>
Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
parent a524b118

tools/testing/selftests/timers/set-timer-lat.c

+73 −13
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ 
 */





#include <errno.h>

#include <stdio.h>

#include <unistd.h>

#include <time.h>
@@ -122,17 +123,17 @@ void sigalarm(int signo) 
		max_latency_ns = delta_ns;

}



void describe_timer(int flags)

void describe_timer(int flags, int interval)

{

	printf("%-22s %s ",

	printf("%-22s %s %s ",

			clockstring(clock_id),

			flags ? "ABSTIME":"RELTIME");

			flags ? "ABSTIME":"RELTIME",

			interval ? "PERIODIC":"ONE-SHOT");

}



int do_timer(int clock_id, int flags)

int setup_timer(int clock_id, int flags, int interval, timer_t *tm1)

{

	struct sigevent se;

	timer_t tm1;

	struct itimerspec its1, its2;

	int err;
@@ -146,7 +147,7 @@ int do_timer(int clock_id, int flags) 
	alarmcount = 0;

	timer_fired_early = 0;



	err = timer_create(clock_id, &se, &tm1);

	err = timer_create(clock_id, &se, tm1);

	if (err) {

		if ((clock_id == CLOCK_REALTIME_ALARM) ||

		    (clock_id == CLOCK_BOOTTIME_ALARM)) {
@@ -167,19 +168,23 @@ int do_timer(int clock_id, int flags) 
		its1.it_value.tv_sec = TIMER_SECS;

		its1.it_value.tv_nsec = 0;

	}

	its1.it_interval.tv_sec = TIMER_SECS;

	its1.it_interval.tv_sec = interval;

	its1.it_interval.tv_nsec = 0;



	err = timer_settime(tm1, flags, &its1, &its2);

	err = timer_settime(*tm1, flags, &its1, &its2);

	if (err) {

		printf("%s - timer_settime() failed\n", clockstring(clock_id));

		return -1;

	}



	while (alarmcount < 5)

		sleep(1);

	return 0;

}



int check_timer_latency(int flags, int interval)

{

	int err = 0;



	describe_timer(flags);

	describe_timer(flags, interval);

	printf("timer fired early: %7d : ", timer_fired_early);

	if (!timer_fired_early) {

		printf("[OK]\n");
@@ -188,10 +193,9 @@ int do_timer(int clock_id, int flags) 
		err = -1;

	}



	describe_timer(flags);

	describe_timer(flags, interval);

	printf("max latency: %10lld ns : ", max_latency_ns);



	timer_delete(tm1);

	if (max_latency_ns < UNRESONABLE_LATENCY) {

		printf("[OK]\n");

	} else {
@@ -201,6 +205,60 @@ int do_timer(int clock_id, int flags) 
	return err;

}



int check_alarmcount(int flags, int interval)

{

	describe_timer(flags, interval);

	printf("count: %19d : ", alarmcount);

	if (alarmcount == 1) {

		printf("[OK]\n");

		return 0;

	}

	printf("[FAILED]\n");

	return -1;

}



int do_timer(int clock_id, int flags)

{

	timer_t tm1;

	const int interval = TIMER_SECS;

	int err;



	err = setup_timer(clock_id, flags, interval, &tm1);

	if (err)

		return err;



	while (alarmcount < 5)

		sleep(1);



	timer_delete(tm1);

	return check_timer_latency(flags, interval);

}



int do_timer_oneshot(int clock_id, int flags)

{

	timer_t tm1;

	const int interval = 0;

	struct timeval timeout;

	fd_set fds;

	int err;



	err = setup_timer(clock_id, flags, interval, &tm1);

	if (err)

		return err;



	memset(&timeout, 0, sizeof(timeout));

	timeout.tv_sec = 5;

	FD_ZERO(&fds);

	do {

		err = select(FD_SETSIZE, &fds, NULL, NULL, &timeout);

	} while (err == -1 && errno == EINTR);



	timer_delete(tm1);

	err = check_timer_latency(flags, interval);

	err |= check_alarmcount(flags, interval);

	return err;

}



int main(void)

{

	struct sigaction act;
@@ -226,6 +284,8 @@ int main(void) 


		ret |= do_timer(clock_id, TIMER_ABSTIME);

		ret |= do_timer(clock_id, 0);

		ret |= do_timer_oneshot(clock_id, TIMER_ABSTIME);

		ret |= do_timer_oneshot(clock_id, 0);

	}

	if (ret)

		return ksft_exit_fail();