selftests/cgroup: fix cpu.max tests

Current cpu.max tests (both the normal one and the nested one) are broken.

They setup cpu.max with 1000 us quota and the default period (100,000 us).
A cpu hog is run for a duration of 1s as per wall clock time. This corresponds
to 10 periods, hence an expected usage of 10,000 us. We want the measured
usage (as per cpu.stat) to be close to 10,000 us.

Previously, this approximate equality test was done by
`!values_close(usage_usec, expected_usage_usec, 95)`: if the absolute
difference between usage_usec and expected_usage_usec is greater than 95% of
their sum, then we pass. And expected_usage_usec was set to 1,000,000 us.
Mathematically, this translates to the following being true for pass:

	|usage - expected_usage| > (usage + expected_usage)*0.95

	If usage > expected_usage:
		usage - expected_usage > (usage + expected_usage)*0.95
		0.05*usage > 1.95*expected_usage
		usage > 39*expected_usage = 39s

	If usage < expected_usage:
		expected_usage - usage > (usage + expected_usage)*0.95
		0.05*expected_usage > 1.95*usage
		usage < 0.0256*expected_usage = 25,600 us

Combined,

	Pass if usage < 25,600 us or > 39 s,

which makes no sense given that all we need is for usage_usec to be close to
10,000 us.

Fix this by explicitly calcuating the expected usage duration based on the
configured quota, default period, and the duration, and compare usage_usec
and expected_usage_usec using values_close() with a 10% error margin.

Also, use snprintf to get the quota string to write to cpu.max instead of
hardcoding the quota, ensuring a single source of truth.

Remove the check comparing user_usec and expected_usage_usec, since on running
this test modified with printfs, it's seen that user_usec and usage_usec can
regularly exceed the theoretical expected_usage_usec:

	$ sudo ./test_cpu
	user: 10485, usage: 10485, expected: 10000
	ok 1 test_cpucg_max
	user: 11127, usage: 11127, expected: 10000
	ok 2 test_cpucg_max_nested
	$ sudo ./test_cpu
	user: 10286, usage: 10286, expected: 10000
	ok 1 test_cpucg_max
	user: 10404, usage: 11271, expected: 10000
	ok 2 test_cpucg_max_nested

Hence, a values_close() check of usage_usec and expected_usage_usec is
sufficient.

Fixes: a79906570f9646ae17 ("cgroup: Add test_cpucg_max_nested() testcase")
Fixes: 889ab8113ef1386c57 ("cgroup: Add test_cpucg_max() testcase")
Acked-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Shashank Balaji <shashank.mahadasyam@sony.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

0 files changed, 0 insertions, 0 deletions