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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: Greg Hackmann <ghackmann@google.com> Signed-off-by: John Stultz <john.stultz@linaro.org>
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1 changed files with 73 additions and 13 deletions
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@ -20,6 +20,7 @@
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*/
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <unistd.h>
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#include <time.h>
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#include <time.h>
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@ -122,17 +123,17 @@ void sigalarm(int signo)
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max_latency_ns = delta_ns;
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max_latency_ns = delta_ns;
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}
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}
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void describe_timer(int flags)
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void describe_timer(int flags, int interval)
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{
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{
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printf("%-22s %s ",
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printf("%-22s %s %s ",
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clockstring(clock_id),
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clockstring(clock_id),
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flags ? "ABSTIME":"RELTIME");
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flags ? "ABSTIME":"RELTIME",
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interval ? "PERIODIC":"ONE-SHOT");
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}
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}
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int do_timer(int clock_id, int flags)
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int setup_timer(int clock_id, int flags, int interval, timer_t *tm1)
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{
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{
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struct sigevent se;
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struct sigevent se;
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timer_t tm1;
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struct itimerspec its1, its2;
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struct itimerspec its1, its2;
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int err;
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int err;
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@ -146,7 +147,7 @@ int do_timer(int clock_id, int flags)
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alarmcount = 0;
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alarmcount = 0;
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timer_fired_early = 0;
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timer_fired_early = 0;
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err = timer_create(clock_id, &se, &tm1);
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err = timer_create(clock_id, &se, tm1);
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if (err) {
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if (err) {
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if ((clock_id == CLOCK_REALTIME_ALARM) ||
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if ((clock_id == CLOCK_REALTIME_ALARM) ||
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(clock_id == CLOCK_BOOTTIME_ALARM)) {
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(clock_id == CLOCK_BOOTTIME_ALARM)) {
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@ -167,19 +168,23 @@ int do_timer(int clock_id, int flags)
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its1.it_value.tv_sec = TIMER_SECS;
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its1.it_value.tv_sec = TIMER_SECS;
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its1.it_value.tv_nsec = 0;
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its1.it_value.tv_nsec = 0;
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}
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}
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its1.it_interval.tv_sec = TIMER_SECS;
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its1.it_interval.tv_sec = interval;
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its1.it_interval.tv_nsec = 0;
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its1.it_interval.tv_nsec = 0;
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err = timer_settime(tm1, flags, &its1, &its2);
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err = timer_settime(*tm1, flags, &its1, &its2);
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if (err) {
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if (err) {
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printf("%s - timer_settime() failed\n", clockstring(clock_id));
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printf("%s - timer_settime() failed\n", clockstring(clock_id));
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return -1;
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return -1;
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}
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}
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while (alarmcount < 5)
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return 0;
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sleep(1);
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}
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describe_timer(flags);
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int check_timer_latency(int flags, int interval)
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{
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int err = 0;
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describe_timer(flags, interval);
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printf("timer fired early: %7d : ", timer_fired_early);
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printf("timer fired early: %7d : ", timer_fired_early);
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if (!timer_fired_early) {
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if (!timer_fired_early) {
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printf("[OK]\n");
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printf("[OK]\n");
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@ -188,10 +193,9 @@ int do_timer(int clock_id, int flags)
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err = -1;
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err = -1;
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}
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}
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describe_timer(flags);
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describe_timer(flags, interval);
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printf("max latency: %10lld ns : ", max_latency_ns);
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printf("max latency: %10lld ns : ", max_latency_ns);
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timer_delete(tm1);
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if (max_latency_ns < UNRESONABLE_LATENCY) {
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if (max_latency_ns < UNRESONABLE_LATENCY) {
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printf("[OK]\n");
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printf("[OK]\n");
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} else {
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} else {
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@ -201,6 +205,60 @@ int do_timer(int clock_id, int flags)
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return err;
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return err;
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}
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}
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int check_alarmcount(int flags, int interval)
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{
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describe_timer(flags, interval);
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printf("count: %19d : ", alarmcount);
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if (alarmcount == 1) {
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printf("[OK]\n");
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return 0;
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}
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printf("[FAILED]\n");
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return -1;
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}
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int do_timer(int clock_id, int flags)
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{
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timer_t tm1;
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const int interval = TIMER_SECS;
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int err;
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err = setup_timer(clock_id, flags, interval, &tm1);
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if (err)
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return err;
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while (alarmcount < 5)
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sleep(1);
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timer_delete(tm1);
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return check_timer_latency(flags, interval);
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}
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int do_timer_oneshot(int clock_id, int flags)
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{
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timer_t tm1;
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const int interval = 0;
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struct timeval timeout;
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fd_set fds;
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int err;
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err = setup_timer(clock_id, flags, interval, &tm1);
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if (err)
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return err;
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memset(&timeout, 0, sizeof(timeout));
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timeout.tv_sec = 5;
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FD_ZERO(&fds);
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do {
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err = select(FD_SETSIZE, &fds, NULL, NULL, &timeout);
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} while (err == -1 && errno == EINTR);
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timer_delete(tm1);
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err = check_timer_latency(flags, interval);
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err |= check_alarmcount(flags, interval);
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return err;
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}
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int main(void)
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int main(void)
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{
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{
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struct sigaction act;
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struct sigaction act;
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@ -226,6 +284,8 @@ int main(void)
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ret |= do_timer(clock_id, TIMER_ABSTIME);
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ret |= do_timer(clock_id, TIMER_ABSTIME);
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ret |= do_timer(clock_id, 0);
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ret |= do_timer(clock_id, 0);
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ret |= do_timer_oneshot(clock_id, TIMER_ABSTIME);
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ret |= do_timer_oneshot(clock_id, 0);
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}
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}
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if (ret)
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if (ret)
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return ksft_exit_fail();
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return ksft_exit_fail();
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