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selftests/cgroup: add user_usec sanity check in test_cpucg_nice

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In test_cpucg_nice, after the child process exits, user_usec is
read from cpu.stat but the value is not checked. Add a sanity check
to ensure user_usec > 0, analogous to test_cpucg_stats(), so that
the test fails early if CPU usage wasn't properly accounted.

Signed-off-by: Shaojie Sun <sunshaojie@kylinos.cn>
Reviewed-by: Michal Koutný <mkoutny@suse.com>
Acked-by: Tao Cui <cuitao@kylinos.cn>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Shaojie Sun 2026-07-30 21:07:17 +08:00 committed by Tejun Heo
parent ae649c9636
commit 77bc7e952f
1 changed files with 2 additions and 0 deletions
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2
tools/testing/selftests/cgroup/test_cpu.c
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@ -291,6 +291,8 @@ static int test_cpucg_nice(const char *root)
user_usec = cg_read_key_long(cpucg, "cpu.stat", "user_usec");
nice_usec = cg_read_key_long(cpucg, "cpu.stat", "nice_usec");
if (user_usec <= 0)
goto cleanup;
if (!values_close_report(nice_usec, expected_nice_usec, 1))
goto cleanup;