kselftest/cgroup: fix unexpected testing failure on test_memcontrol
The cgroup testing relies on the root cgroup's subtree_control setting, If the 'memory' controller isn't set, all test cases will be failed as following: $ sudo ./test_memcontrol not ok 1 test_memcg_subtree_control not ok 2 test_memcg_current ok 3 # skip test_memcg_min not ok 4 test_memcg_low not ok 5 test_memcg_high not ok 6 test_memcg_max not ok 7 test_memcg_oom_events ok 8 # skip test_memcg_swap_max not ok 9 test_memcg_sock not ok 10 test_memcg_oom_group_leaf_events not ok 11 test_memcg_oom_group_parent_events not ok 12 test_memcg_oom_group_score_events 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 <alex.shi@linux.alibaba.com> Cc: Shuah Khan <shuah@kernel.org> Cc: Roman Gushchin <guro@fb.com> Cc: Tejun Heo <tj@kernel.org> Cc: Mike Rapoport <rppt@linux.vnet.ibm.com> Cc: Jay Kamat <jgkamat@fb.com> Cc: linux-kselftest@vger.kernel.org Cc: linux-kernel@vger.kernel.org Reviewed-by: Roman Gushchin <guro@fb.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
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@ -1205,6 +1205,10 @@ int main(int argc, char **argv)
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if (cg_read_strstr(root, "cgroup.controllers", "memory"))
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ksft_exit_skip("memory controller isn't available\n");
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if (cg_read_strstr(root, "cgroup.subtree_control", "memory"))
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if (cg_write(root, "cgroup.subtree_control", "+memory"))
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ksft_exit_skip("Failed to set memory controller\n");
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for (i = 0; i < ARRAY_SIZE(tests); i++) {
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switch (tests[i].fn(root)) {
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case KSFT_PASS:
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