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kselftest/cgroup: fix unexpected testing failure on test_core

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The cgroup testing relys on the root cgroup's subtree_control setting,
If the 'memory' controller isn't set, some test cases will be failed
as following:

$sudo  ./test_core
not ok 1 test_cgcore_internal_process_constraint
ok 2 test_cgcore_top_down_constraint_enable
not ok 3 test_cgcore_top_down_constraint_disable
...

To correct this unexpected failure, this patch write the 'memory' to
subtree_control of root to get a right result.

Signed-off-by: Alex Shi <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Tejun Heo <[email protected]>
Cc: Roman Gushchin <[email protected]>
Cc: Claudio Zumbo <[email protected]>
Cc: Claudio <[email protected]>
Cc: [email protected]
Cc: [email protected]
Reviewed-by: Roman Gushchin <[email protected]>
Acked-by: Tejun Heo <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>
This commit is contained in:
Alex Shi 2019-05-27 14:28:06 +08:00 • committed by Shuah Khan
commit 00e38a5d75
1 changed files with 5 additions and 0 deletions
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5
tools/testing/selftests/cgroup/test_core.c
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@ -376,6 +376,11 @@ int main(int argc, char *argv[])
if (cg_find_unified_root(root, sizeof(root)))
ksft_exit_skip("cgroup v2 isn't mounted\n");
if (cg_read_strstr(root, "cgroup.subtree_control", "memory"))
if (cg_write(root, "cgroup.subtree_control", "+memory"))
ksft_exit_skip("Failed to set memory controller\n");
for (i = 0; i < ARRAY_SIZE(tests); i++) {
switch (tests[i].fn(root)) {
case KSFT_PASS: