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cgroup: Add test_cpucg_max_nested() testcase

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The cgroup cpu controller selftests have a test_cpucg_max() testcase
that validates the behavior of the cpu.max knob. Let's also add a
testcase that verifies that the behavior works correctly when set on a
nested cgroup.

Signed-off-by: David Vernet <void@manifault.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
David Vernet 2022-04-23 05:30:53 -07:00 • committed by Tejun Heo
parent 889ab8113e
commit a79906570f
1 changed files with 63 additions and 0 deletions
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63
tools/testing/selftests/cgroup/test_cpu.c
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@ -617,6 +617,68 @@ cleanup:
return ret;
}
/*
* This test verifies that a process inside of a nested cgroup whose parent
* group has a cpu.max value set, is properly throttled.
*/
static int test_cpucg_max_nested(const char *root)
{
int ret = KSFT_FAIL;
long usage_usec, user_usec;
long usage_seconds = 1;
long expected_usage_usec = usage_seconds * USEC_PER_SEC;
char *parent, *child;
parent = cg_name(root, "cpucg_parent");
child = cg_name(parent, "cpucg_child");
if (!parent || !child)
goto cleanup;
if (cg_create(parent))
goto cleanup;
if (cg_write(parent, "cgroup.subtree_control", "+cpu"))
goto cleanup;
if (cg_create(child))
goto cleanup;
if (cg_write(parent, "cpu.max", "1000"))
goto cleanup;
struct cpu_hog_func_param param = {
.nprocs = 1,
.ts = {
.tv_sec = usage_seconds,
.tv_nsec = 0,
},
.clock_type = CPU_HOG_CLOCK_WALL,
};
if (cg_run(child, hog_cpus_timed, (void *)&param))
goto cleanup;
usage_usec = cg_read_key_long(child, "cpu.stat", "usage_usec");
user_usec = cg_read_key_long(child, "cpu.stat", "user_usec");
if (user_usec <= 0)
goto cleanup;
if (user_usec >= expected_usage_usec)
goto cleanup;
if (values_close(usage_usec, expected_usage_usec, 95))
goto cleanup;
ret = KSFT_PASS;
cleanup:
cg_destroy(child);
free(child);
cg_destroy(parent);
free(parent);
return ret;
}
#define T(x) { x, #x }
struct cpucg_test {
int (*fn)(const char *root);
@ -629,6 +691,7 @@ struct cpucg_test {
T(test_cpucg_nested_weight_overprovisioned),
T(test_cpucg_nested_weight_underprovisioned),
T(test_cpucg_max),
T(test_cpucg_max_nested),
};
#undef T