[LTP] [PATCH] clock_gettime03: Extend tolerance on slow kernel configs

[LTP] [PATCH] clock_gettime03: Extend tolerance on slow kernel configs

[Wake Liu via ltp]

Debugging/instrumentation kernel configs (like KASAN, LOCKDEP, etc.)
can significantly degrade performance, causing the time namespace
offset checks to exceed the default 10ms tolerance.

Use tst_has_slow_kconfig() to detect these slow configurations and
multiply the delta tolerance by 10, preventing false test failures
on slow/debug kernels.

Signed-off-by: Wake Liu <wakel@google.com>
---
 testcases/kernel/syscalls/clock_gettime/clock_gettime03.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/testcases/kernel/syscalls/clock_gettime/clock_gettime03.c b/testcases/kernel/syscalls/clock_gettime/clock_gettime03.c
index 495030c07e..665a1107b8 100644
--- a/testcases/kernel/syscalls/clock_gettime/clock_gettime03.c
+++ b/testcases/kernel/syscalls/clock_gettime/clock_gettime03.c
@@ -16,6 +16,7 @@
 #include "time64_variants.h"
 #include "tst_safe_clocks.h"
 #include "tst_timer.h"
+#include "tst_kconfig.h"
 #include "lapi/sched.h"
 
 static struct tcase {
@@ -117,6 +118,11 @@ static void setup(void)
 		delta *= 10;
 	}
 
+	if (tst_has_slow_kconfig()) {
+		tst_res(TINFO, "Slow kernel config detected, multiply the delta by 10.");
+		delta *= 10;
+	}
+
 	now.type = then.type = parent_then.type = tv->ts_type;
 	tst_res(TINFO, "Testing variant: %s", variants[tst_variant].desc);
 	parent_ns = SAFE_OPEN("/proc/self/ns/time_for_children", O_RDONLY);
-- 
2.55.0.508.g3f0d502094-goog


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Re: [LTP] [PATCH] clock_gettime03: Extend tolerance on slow kernel configs

[Andrea Cervesato via ltp]

Reviewed-by: Andrea Cervesato <andrea.cervesato@suse.com>

--
Andrea Cervesato
SUSE QE Automation Engineer Linux
andrea.cervesato@suse.com

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Re: [LTP] clock_gettime03: Extend tolerance on slow kernel configs

[linuxtestproject.agent]

Hi Wake,

On Fri, 31 Jul 2026, Wake Liu wrote:
> clock_gettime03: Extend tolerance on slow kernel configs

Verdict - Reviewed

---
Note:

The agent can sometimes produce false positives although often its
findings are genuine. If you find issues with the review, please
comment this email or ignore the suggestions.

Regards,
LTP AI Reviewer

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Re: [LTP] [PATCH] clock_gettime03: Extend tolerance on slow kernel configs

[Andrea Cervesato via ltp]

Merged, Thanks!

--
Andrea Cervesato
SUSE QE Automation Engineer Linux
andrea.cervesato@suse.com

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