* [RFC][PATCH v2] selftest: timers: Tweak raw_skew to SKIP when ADJ_OFFSET/other clock adjustments are in progress
@ 2018-07-05 17:50 ` John Stultz
0 siblings, 0 replies; 6+ messages in thread
From: john.stultz @ 2018-07-05 17:50 UTC (permalink / raw)
In the past we've warned when ADJ_OFFSET was in progress, usually
caused by ntpd or some other time adjusting daemon running in non
steady sate, which can cause the skew calculations to be incorrect
Thus, this patch sets a flag which we check if the clock was being
adjusted when we fail so that we don't cause false negatives.
Cc: Thomas Gleixner <tglx at linutronix.de>
Cc: Ingo Molnar <mingo at kernel.org>
Cc: Miroslav Lichvar <mlichvar at redhat.com>
Cc: Richard Cochran <richardcochran at gmail.com>
Cc: Prarit Bhargava <prarit at redhat.com>
Cc: Stephen Boyd <sboyd at kernel.org>
Cc: Shuah Khan <shuah at kernel.org>
Cc: linux-kselftest at vger.kernel.org
Suggested-by: Miroslav Lichvar <mlichvar at redhat.com>
Signed-off-by: John Stultz <john.stultz at linaro.org>
---
v2: Widened the checks to look for other clock adjustments that
could happen, as suggested by Miroslav
---
tools/testing/selftests/timers/raw_skew.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/tools/testing/selftests/timers/raw_skew.c b/tools/testing/selftests/timers/raw_skew.c
index ca6cd14..dcf73c5 100644
--- a/tools/testing/selftests/timers/raw_skew.c
+++ b/tools/testing/selftests/timers/raw_skew.c
@@ -134,6 +134,11 @@ int main(int argv, char **argc)
printf(" %lld.%i(act)", ppm/1000, abs((int)(ppm%1000)));
if (llabs(eppm - ppm) > 1000) {
+ if (tx1.offset || tx2.offset ||
+ tx1.freq != tx2.freq || tx1.tick != tx2.tick) {
+ printf(" [SKIP]\n");
+ return ksft_exit_skip("The clock was adjusted externally. Shutdown NTPd or other time sync daemons\n");
+ }
printf(" [FAILED]\n");
return ksft_exit_fail();
}
--
2.7.4
--
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^ permalink raw reply related [flat|nested] 6+ messages in thread* [RFC][PATCH v2] selftest: timers: Tweak raw_skew to SKIP when ADJ_OFFSET/other clock adjustments are in progress
@ 2018-07-05 17:50 ` John Stultz
0 siblings, 0 replies; 6+ messages in thread
From: John Stultz @ 2018-07-05 17:50 UTC (permalink / raw)
To: lkml
Cc: John Stultz, Thomas Gleixner, Ingo Molnar, Miroslav Lichvar,
Richard Cochran, Prarit Bhargava, Stephen Boyd, Shuah Khan,
linux-kselftest
In the past we've warned when ADJ_OFFSET was in progress, usually
caused by ntpd or some other time adjusting daemon running in non
steady sate, which can cause the skew calculations to be incorrect
Thus, this patch sets a flag which we check if the clock was being
adjusted when we fail so that we don't cause false negatives.
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 <sboyd@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: linux-kselftest@vger.kernel.org
Suggested-by: Miroslav Lichvar <mlichvar@redhat.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
---
v2: Widened the checks to look for other clock adjustments that
could happen, as suggested by Miroslav
---
tools/testing/selftests/timers/raw_skew.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/tools/testing/selftests/timers/raw_skew.c b/tools/testing/selftests/timers/raw_skew.c
index ca6cd14..dcf73c5 100644
--- a/tools/testing/selftests/timers/raw_skew.c
+++ b/tools/testing/selftests/timers/raw_skew.c
@@ -134,6 +134,11 @@ int main(int argv, char **argc)
printf(" %lld.%i(act)", ppm/1000, abs((int)(ppm%1000)));
if (llabs(eppm - ppm) > 1000) {
+ if (tx1.offset || tx2.offset ||
+ tx1.freq != tx2.freq || tx1.tick != tx2.tick) {
+ printf(" [SKIP]\n");
+ return ksft_exit_skip("The clock was adjusted externally. Shutdown NTPd or other time sync daemons\n");
+ }
printf(" [FAILED]\n");
return ksft_exit_fail();
}
--
2.7.4
^ permalink raw reply related [flat|nested] 6+ messages in thread* [RFC][PATCH v2] selftest: timers: Tweak raw_skew to SKIP when ADJ_OFFSET/other clock adjustments are in progress
@ 2018-07-05 17:50 ` John Stultz
0 siblings, 0 replies; 6+ messages in thread
From: John Stultz @ 2018-07-05 17:50 UTC (permalink / raw)
In the past we've warned when ADJ_OFFSET was in progress, usually
caused by ntpd or some other time adjusting daemon running in non
steady sate, which can cause the skew calculations to be incorrect
Thus, this patch sets a flag which we check if the clock was being
adjusted when we fail so that we don't cause false negatives.
Cc: Thomas Gleixner <tglx at linutronix.de>
Cc: Ingo Molnar <mingo at kernel.org>
Cc: Miroslav Lichvar <mlichvar at redhat.com>
Cc: Richard Cochran <richardcochran at gmail.com>
Cc: Prarit Bhargava <prarit at redhat.com>
Cc: Stephen Boyd <sboyd at kernel.org>
Cc: Shuah Khan <shuah at kernel.org>
Cc: linux-kselftest at vger.kernel.org
Suggested-by: Miroslav Lichvar <mlichvar at redhat.com>
Signed-off-by: John Stultz <john.stultz at linaro.org>
---
v2: Widened the checks to look for other clock adjustments that
could happen, as suggested by Miroslav
---
tools/testing/selftests/timers/raw_skew.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/tools/testing/selftests/timers/raw_skew.c b/tools/testing/selftests/timers/raw_skew.c
index ca6cd14..dcf73c5 100644
--- a/tools/testing/selftests/timers/raw_skew.c
+++ b/tools/testing/selftests/timers/raw_skew.c
@@ -134,6 +134,11 @@ int main(int argv, char **argc)
printf(" %lld.%i(act)", ppm/1000, abs((int)(ppm%1000)));
if (llabs(eppm - ppm) > 1000) {
+ if (tx1.offset || tx2.offset ||
+ tx1.freq != tx2.freq || tx1.tick != tx2.tick) {
+ printf(" [SKIP]\n");
+ return ksft_exit_skip("The clock was adjusted externally. Shutdown NTPd or other time sync daemons\n");
+ }
printf(" [FAILED]\n");
return ksft_exit_fail();
}
--
2.7.4
--
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^ permalink raw reply related [flat|nested] 6+ messages in thread* [RFC][PATCH v2] selftest: timers: Tweak raw_skew to SKIP when ADJ_OFFSET/other clock adjustments are in progress
@ 2018-07-09 9:26 ` Miroslav Lichvar
0 siblings, 0 replies; 6+ messages in thread
From: mlichvar @ 2018-07-09 9:26 UTC (permalink / raw)
On Thu, Jul 05, 2018 at 10:50:31AM -0700, John Stultz wrote:
> In the past we've warned when ADJ_OFFSET was in progress, usually
> caused by ntpd or some other time adjusting daemon running in non
> steady sate, which can cause the skew calculations to be incorrect
>
> Thus, this patch sets a flag which we check if the clock was being
> adjusted when we fail so that we don't cause false negatives.
The commit message might need an update as the code no longer sets a
flag. Other than that, it looks good to me.
Thanks,
> --- a/tools/testing/selftests/timers/raw_skew.c
> +++ b/tools/testing/selftests/timers/raw_skew.c
> @@ -134,6 +134,11 @@ int main(int argv, char **argc)
> printf(" %lld.%i(act)", ppm/1000, abs((int)(ppm%1000)));
>
> if (llabs(eppm - ppm) > 1000) {
> + if (tx1.offset || tx2.offset ||
> + tx1.freq != tx2.freq || tx1.tick != tx2.tick) {
> + printf(" [SKIP]\n");
> + return ksft_exit_skip("The clock was adjusted externally. Shutdown NTPd or other time sync daemons\n");
> + }
> printf(" [FAILED]\n");
> return ksft_exit_fail();
> }
> --
> 2.7.4
>
--
Miroslav Lichvar
--
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^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [RFC][PATCH v2] selftest: timers: Tweak raw_skew to SKIP when ADJ_OFFSET/other clock adjustments are in progress
@ 2018-07-09 9:26 ` Miroslav Lichvar
0 siblings, 0 replies; 6+ messages in thread
From: Miroslav Lichvar @ 2018-07-09 9:26 UTC (permalink / raw)
To: John Stultz
Cc: lkml, Thomas Gleixner, Ingo Molnar, Richard Cochran,
Prarit Bhargava, Stephen Boyd, Shuah Khan, linux-kselftest
On Thu, Jul 05, 2018 at 10:50:31AM -0700, John Stultz wrote:
> In the past we've warned when ADJ_OFFSET was in progress, usually
> caused by ntpd or some other time adjusting daemon running in non
> steady sate, which can cause the skew calculations to be incorrect
>
> Thus, this patch sets a flag which we check if the clock was being
> adjusted when we fail so that we don't cause false negatives.
The commit message might need an update as the code no longer sets a
flag. Other than that, it looks good to me.
Thanks,
> --- a/tools/testing/selftests/timers/raw_skew.c
> +++ b/tools/testing/selftests/timers/raw_skew.c
> @@ -134,6 +134,11 @@ int main(int argv, char **argc)
> printf(" %lld.%i(act)", ppm/1000, abs((int)(ppm%1000)));
>
> if (llabs(eppm - ppm) > 1000) {
> + if (tx1.offset || tx2.offset ||
> + tx1.freq != tx2.freq || tx1.tick != tx2.tick) {
> + printf(" [SKIP]\n");
> + return ksft_exit_skip("The clock was adjusted externally. Shutdown NTPd or other time sync daemons\n");
> + }
> printf(" [FAILED]\n");
> return ksft_exit_fail();
> }
> --
> 2.7.4
>
--
Miroslav Lichvar
^ permalink raw reply [flat|nested] 6+ messages in thread* [RFC][PATCH v2] selftest: timers: Tweak raw_skew to SKIP when ADJ_OFFSET/other clock adjustments are in progress
@ 2018-07-09 9:26 ` Miroslav Lichvar
0 siblings, 0 replies; 6+ messages in thread
From: Miroslav Lichvar @ 2018-07-09 9:26 UTC (permalink / raw)
On Thu, Jul 05, 2018@10:50:31AM -0700, John Stultz wrote:
> In the past we've warned when ADJ_OFFSET was in progress, usually
> caused by ntpd or some other time adjusting daemon running in non
> steady sate, which can cause the skew calculations to be incorrect
>
> Thus, this patch sets a flag which we check if the clock was being
> adjusted when we fail so that we don't cause false negatives.
The commit message might need an update as the code no longer sets a
flag. Other than that, it looks good to me.
Thanks,
> --- a/tools/testing/selftests/timers/raw_skew.c
> +++ b/tools/testing/selftests/timers/raw_skew.c
> @@ -134,6 +134,11 @@ int main(int argv, char **argc)
> printf(" %lld.%i(act)", ppm/1000, abs((int)(ppm%1000)));
>
> if (llabs(eppm - ppm) > 1000) {
> + if (tx1.offset || tx2.offset ||
> + tx1.freq != tx2.freq || tx1.tick != tx2.tick) {
> + printf(" [SKIP]\n");
> + return ksft_exit_skip("The clock was adjusted externally. Shutdown NTPd or other time sync daemons\n");
> + }
> printf(" [FAILED]\n");
> return ksft_exit_fail();
> }
> --
> 2.7.4
>
--
Miroslav Lichvar
--
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^ permalink raw reply [flat|nested] 6+ messages in thread
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Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
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2018-07-05 17:50 [RFC][PATCH v2] selftest: timers: Tweak raw_skew to SKIP when ADJ_OFFSET/other clock adjustments are in progress john.stultz
2018-07-05 17:50 ` John Stultz
2018-07-05 17:50 ` John Stultz
2018-07-09 9:26 ` mlichvar
2018-07-09 9:26 ` Miroslav Lichvar
2018-07-09 9:26 ` Miroslav Lichvar
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