[PATCH] selftests: timers: Make sleep time in raw_skew configurable

[PATCH] selftests: timers: Make sleep time in raw_skew configurable

[Wake Liu]

The raw_skew test currently sleeps for 120 seconds to estimate clock
drift. This is a very long time for a single test, and can cause
timeouts in automated test suites or CI systems.

Allow overriding the sleep time via a command line argument,
so it can be adjusted if needed in different environments, while
keeping the default at 120 seconds to preserve original behavior.

Signed-off-by: Wake Liu <wakel@google.com>
---
 tools/testing/selftests/timers/raw_skew.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/timers/raw_skew.c b/tools/testing/selftests/timers/raw_skew.c
index a7bae7d80916..03cdcecba8f4 100644
--- a/tools/testing/selftests/timers/raw_skew.c
+++ b/tools/testing/selftests/timers/raw_skew.c
@@ -92,6 +92,15 @@ int main(int argc, char **argv)
 	struct timespec mon, raw, start, end;
 	long long delta1, delta2, interval, eppm, ppm;
 	struct timex tx1, tx2;
+	int sleep_sec = 120;
+
+	if (argc > 1) {
+		sleep_sec = atoi(argv[1]);
+		if (sleep_sec <= 0) {
+			printf("Invalid sleep time, using default 120s\n");
+			sleep_sec = 120;
+		}
+	}
 
 	setbuf(stdout, NULL);
 
@@ -109,9 +118,9 @@ int main(int argc, char **argv)
 	if (tx1.offset)
 		printf("WARNING: ADJ_OFFSET in progress, this will cause inaccurate results\n");
 
-	printf("Estimating clock drift: ");
+	printf("Estimating clock drift (%ds): ", sleep_sec);
 	fflush(stdout);
-	sleep(120);
+	sleep(sleep_sec);
 
 	get_monotonic_and_raw(&mon, &raw);
 	end = mon;
-- 
2.55.0.795.g602f6c329a-goog

Re: [PATCH] selftests: timers: Make sleep time in raw_skew configurable

[John Stultz]

On Thu, Jul 9, 2026 at 7:51 PM Wake Liu <wakel@google.com> wrote:
>
> The raw_skew test currently sleeps for 120 seconds to estimate clock
> drift. This is a very long time for a single test, and can cause
> timeouts in automated test suites or CI systems.
>

Sheesh, nobody has two minutes to spare?  :)

> Allow overriding the sleep time via a command line argument,
> so it can be adjusted if needed in different environments, while
> keeping the default at 120 seconds to preserve original behavior.
>
> Signed-off-by: Wake Liu <wakel@google.com>
> ---
>  tools/testing/selftests/timers/raw_skew.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
>
> diff --git a/tools/testing/selftests/timers/raw_skew.c b/tools/testing/selftests/timers/raw_skew.c
> index a7bae7d80916..03cdcecba8f4 100644
> --- a/tools/testing/selftests/timers/raw_skew.c
> +++ b/tools/testing/selftests/timers/raw_skew.c
> @@ -92,6 +92,15 @@ int main(int argc, char **argv)
>         struct timespec mon, raw, start, end;
>         long long delta1, delta2, interval, eppm, ppm;
>         struct timex tx1, tx2;
> +       int sleep_sec = 120;
> +
> +       if (argc > 1) {
> +               sleep_sec = atoi(argv[1]);
> +               if (sleep_sec <= 0) {
> +                       printf("Invalid sleep time, using default 120s\n");
> +                       sleep_sec = 120;
> +               }
> +       }

This probably needs some usage documentation so folks can discover this?
(Which may mean also supporting -h/--help)

Otherwise seems reasonable.

thanks!
-john

[PATCH v2] selftests: timers: Make sleep time in raw_skew configurable

[Wake Liu]

The raw_skew test currently sleeps for 120 seconds to estimate clock
drift. This is a very long time for a single test, and can cause
timeouts in automated test suites or CI systems.

Allow overriding the sleep time via a command line argument,
so it can be adjusted if needed in different environments, while
keeping the default at 120 seconds to preserve original behavior.

Also add -h/--help support to document this option.

Signed-off-by: Wake Liu <wakel@google.com>
---
 tools/testing/selftests/timers/raw_skew.c | 24 +++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/timers/raw_skew.c b/tools/testing/selftests/timers/raw_skew.c
index a7bae7d80916..5fff3eaf1307 100644
--- a/tools/testing/selftests/timers/raw_skew.c
+++ b/tools/testing/selftests/timers/raw_skew.c
@@ -27,6 +27,7 @@
 #include <time.h>
 #include <include/vdso/time64.h>
 #include "kselftest.h"
+#include <string.h>
 
 #define shift_right(x, s) ({		\
 	__typeof__(x) __x = (x);	\
@@ -87,11 +88,30 @@ void get_monotonic_and_raw(struct timespec *mon, struct timespec *raw)
 	}
 }
 
+static void usage(char *argv0)
+{
+	printf("Usage: %s [sleep_secs]\n", argv0);
+	printf("  sleep_secs: time to sleep in seconds to estimate clock drift (default: 120s)\n");
+}
+
 int main(int argc, char **argv)
 {
 	struct timespec mon, raw, start, end;
 	long long delta1, delta2, interval, eppm, ppm;
 	struct timex tx1, tx2;
+	int sleep_sec = 120;
+
+	if (argc > 1) {
+		if (strcmp(argv[1], "-h") == 0 || strcmp(argv[1], "--help") == 0) {
+			usage(argv[0]);
+			ksft_exit_pass();
+		}
+		sleep_sec = atoi(argv[1]);
+		if (sleep_sec <= 0) {
+			printf("Invalid sleep time, using default 120s\n");
+			sleep_sec = 120;
+		}
+	}
 
 	setbuf(stdout, NULL);
 
@@ -109,9 +129,9 @@ int main(int argc, char **argv)
 	if (tx1.offset)
 		printf("WARNING: ADJ_OFFSET in progress, this will cause inaccurate results\n");
 
-	printf("Estimating clock drift: ");
+	printf("Estimating clock drift (%ds): ", sleep_sec);
 	fflush(stdout);
-	sleep(120);
+	sleep(sleep_sec);
 
 	get_monotonic_and_raw(&mon, &raw);
 	end = mon;
-- 
2.55.0.795.g602f6c329a-goog

Re: [PATCH] selftests: timers: Make sleep time in raw_skew configurable

[Wake Liu]

Thanks for the review :)
I've sent out v2 which addresses this by adding -h/--help support and
usage documentation.

On Fri, Jul 10, 2026 at 11:04 AM John Stultz <jstultz@google.com> wrote:
>
> On Thu, Jul 9, 2026 at 7:51 PM Wake Liu <wakel@google.com> wrote:
> >
> > The raw_skew test currently sleeps for 120 seconds to estimate clock
> > drift. This is a very long time for a single test, and can cause
> > timeouts in automated test suites or CI systems.
> >
>
> Sheesh, nobody has two minutes to spare?  :)
>
> > Allow overriding the sleep time via a command line argument,
> > so it can be adjusted if needed in different environments, while
> > keeping the default at 120 seconds to preserve original behavior.
> >
> > Signed-off-by: Wake Liu <wakel@google.com>
> > ---
> >  tools/testing/selftests/timers/raw_skew.c | 13 +++++++++++--
> >  1 file changed, 11 insertions(+), 2 deletions(-)
> >
> > diff --git a/tools/testing/selftests/timers/raw_skew.c b/tools/testing/selftests/timers/raw_skew.c
> > index a7bae7d80916..03cdcecba8f4 100644
> > --- a/tools/testing/selftests/timers/raw_skew.c
> > +++ b/tools/testing/selftests/timers/raw_skew.c
> > @@ -92,6 +92,15 @@ int main(int argc, char **argv)
> >         struct timespec mon, raw, start, end;
> >         long long delta1, delta2, interval, eppm, ppm;
> >         struct timex tx1, tx2;
> > +       int sleep_sec = 120;
> > +
> > +       if (argc > 1) {
> > +               sleep_sec = atoi(argv[1]);
> > +               if (sleep_sec <= 0) {
> > +                       printf("Invalid sleep time, using default 120s\n");
> > +                       sleep_sec = 120;
> > +               }
> > +       }
>
> This probably needs some usage documentation so folks can discover this?
> (Which may mean also supporting -h/--help)
>
> Otherwise seems reasonable.
>
> thanks!
> -john



-- 
Best Regards,
Wake Liu