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Code Issues Releases Wiki Activity

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>
This commit is contained in:
Greg Hackmann 2017-07-25 14:36:26 -07:00 committed by John Stultz
parent a524b1184b
commit 28be3f8f48
1 changed files with 73 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

86
tools/testing/selftests/timers/set-timer-lat.c
View File

@ -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;
}
describe_timer(flags);
int check_timer_latency(int flags, int interval)
{
int err = 0;
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();