diff options
author | David Vernet <void@manifault.com> | 2022-04-23 15:30:52 +0300 |
---|---|---|
committer | Tejun Heo <tj@kernel.org> | 2022-04-25 20:27:31 +0300 |
commit | 889ab8113ef1386c57d64da106b850e752949f07 (patch) | |
tree | a59198119b58b92943b77d5070e675a5ef326daf /tools/testing/selftests/cgroup | |
parent | 89ca0efa8468f230df965257d0c03fc3664b4331 (diff) | |
download | linux-889ab8113ef1386c57d64da106b850e752949f07.tar.xz |
cgroup: Add test_cpucg_max() testcase
The cgroup cpu controller test suite has a number of testcases that
validate the expected behavior of the cpu.weight knob, but none for
cpu.max. This testcase fixes that by adding a testcase for cpu.max as well.
Signed-off-by: David Vernet <void@manifault.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'tools/testing/selftests/cgroup')
-rw-r--r-- | tools/testing/selftests/cgroup/test_cpu.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/tools/testing/selftests/cgroup/test_cpu.c b/tools/testing/selftests/cgroup/test_cpu.c index de6289814c23..715922c15c78 100644 --- a/tools/testing/selftests/cgroup/test_cpu.c +++ b/tools/testing/selftests/cgroup/test_cpu.c @@ -564,6 +564,59 @@ test_cpucg_nested_weight_underprovisioned(const char *root) return run_cpucg_nested_weight_test(root, false); } +/* + * This test creates a cgroup with some maximum value within a period, and + * verifies that a process in the cgroup is not overscheduled. + */ +static int test_cpucg_max(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 *cpucg; + + cpucg = cg_name(root, "cpucg_test"); + if (!cpucg) + goto cleanup; + + if (cg_create(cpucg)) + goto cleanup; + + if (cg_write(cpucg, "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(cpucg, hog_cpus_timed, (void *)¶m)) + goto cleanup; + + usage_usec = cg_read_key_long(cpucg, "cpu.stat", "usage_usec"); + user_usec = cg_read_key_long(cpucg, "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(cpucg); + free(cpucg); + + return ret; +} + #define T(x) { x, #x } struct cpucg_test { int (*fn)(const char *root); @@ -575,6 +628,7 @@ struct cpucg_test { T(test_cpucg_weight_underprovisioned), T(test_cpucg_nested_weight_overprovisioned), T(test_cpucg_nested_weight_underprovisioned), + T(test_cpucg_max), }; #undef T |