[LTP] [PATCH] controllers/cpuacct_task: Increase execution time to 100ms

[LTP] [PATCH] controllers/cpuacct_task: Increase execution time to 100ms

[Wake Liu via ltp]

The test helper cpuacct_task currently runs for 10ms (virtual time)
before exiting. On some systems (e.g. fast virtual machines or under
heavy load), this short duration can lead to 0 usage being recorded in
cpuacct.usage cgroup file due to timing resolution or scheduling delay.

Increase the execution time to 100ms to ensure that the process runs
long enough to register a non-zero CPU usage, reducing flakiness of the
test.

Signed-off-by: Wake Liu <wakel@google.com>
---
 testcases/kernel/controllers/cpuacct/cpuacct_task.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/testcases/kernel/controllers/cpuacct/cpuacct_task.c b/testcases/kernel/controllers/cpuacct/cpuacct_task.c
index 677d6d401..9519bd9b3 100644
--- a/testcases/kernel/controllers/cpuacct/cpuacct_task.c
+++ b/testcases/kernel/controllers/cpuacct/cpuacct_task.c
@@ -62,7 +62,7 @@ int main(int argc, char **argv)
 		return 1;
 	}
 
-	struct itimerval it = {.it_value = {.tv_sec = 0, .tv_usec = 10000}};
+	struct itimerval it = {.it_value = {.tv_sec = 0, .tv_usec = 100000}};
 
 	setitimer(ITIMER_VIRTUAL, &it, NULL);
 	for (;;);
-- 
2.55.0.654.g21b8a5bc05-goog


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Re: [LTP] controllers/cpuacct_task: Increase execution time to 100ms

[linuxtestproject.agent]

Hi Wake,

On Aug 10, 2026, Wake Liu wrote:
> controllers/cpuacct_task: Increase execution time to 100ms

> +	struct itimerval it = {.it_value = {.tv_sec = 0, .tv_usec = 100000}};

Could this avoid increasing every helper's CPU time tenfold? The
cpuacct_100_100 runtest case starts 10,000 helpers, so this requires at least
1,000 aggregate CPU seconds. The shell harness has a 300-second default
timeout, which makes that case time out on systems restricted to three or
fewer CPUs, before accounting for setup and process-management overhead.

Verdict - Needs revision

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