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kselftests: timers: set-timer-lat: Tweak reporting when timer fires early 

Rather than printing an error inside the alarm signal handler, set a
flag that we check later.  This keeps the test from spamming the console
every time the alarm fires early.  It also fixes the test exiting with
error code 0 if this was the only test failure.

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>
This commit is contained in:
Greg Hackmann 2017-07-25 14:36:25 -07:00 committed by John Stultz
parent 6cc636614e
commit a524b1184b
1 changed files with 25 additions and 8 deletions
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33
tools/testing/selftests/timers/set-timer-lat.c
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@ -63,6 +63,7 @@ int alarmcount;
int clock_id;
struct timespec start_time;
long long max_latency_ns;
int timer_fired_early;
char *clockstring(int clockid)
{
@ -115,12 +116,19 @@ void sigalarm(int signo)
delta_ns -= NSEC_PER_SEC * TIMER_SECS * alarmcount;
if (delta_ns < 0)
printf("%s timer fired early: FAIL\n", clockstring(clock_id));
timer_fired_early = 1;
if (delta_ns > max_latency_ns)
max_latency_ns = delta_ns;
}
void describe_timer(int flags)
{
printf("%-22s %s ",
clockstring(clock_id),
flags ? "ABSTIME":"RELTIME");
}
int do_timer(int clock_id, int flags)
{
struct sigevent se;
@ -136,6 +144,7 @@ int do_timer(int clock_id, int flags)
max_latency_ns = 0;
alarmcount = 0;
timer_fired_early = 0;
err = timer_create(clock_id, &se, &tm1);
if (err) {
@ -170,18 +179,26 @@ int do_timer(int clock_id, int flags)
while (alarmcount < 5)
sleep(1);
printf("%-22s %s max latency: %10lld ns : ",
clockstring(clock_id),
flags ? "ABSTIME":"RELTIME",
max_latency_ns);
describe_timer(flags);
printf("timer fired early: %7d : ", timer_fired_early);
if (!timer_fired_early) {
printf("[OK]\n");
} else {
printf("[FAILED]\n");
err = -1;
}
describe_timer(flags);
printf("max latency: %10lld ns : ", max_latency_ns);
timer_delete(tm1);
if (max_latency_ns < UNRESONABLE_LATENCY) {
printf("[OK]\n");
return 0;
} else {
printf("[FAILED]\n");
err = -1;
}
printf("[FAILED]\n");
return -1;
return err;
}
int main(void)