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Commit 44e9d308 authored by Roman Gushchin's avatar Roman Gushchin Committed by Tejun Heo
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kselftests: cgroup: add freezer mkdir test

Add a new cgroup freezer selftest, which checks that if a cgroup is
frozen, their new child cgroups will properly inherit the frozen

It creates a parent cgroup, freezes it, creates a child cgroup
and populates it with a dummy process. Then it checks that both
parent and child cgroup are frozen.
Signed-off-by: default avatarRoman Gushchin <>
Cc: Tejun Heo <>
Cc: Shuah Khan <>
Signed-off-by: default avatarTejun Heo <>
parent 505a8ec7
......@@ -447,6 +447,59 @@ cleanup:
return ret;
* The test creates a cgroups and freezes it. Then it creates a child cgroup
* and populates it with a task. After that it checks that the child cgroup
* is frozen and the parent cgroup remains frozen too.
static int test_cgfreezer_mkdir(const char *root)
int ret = KSFT_FAIL;
char *parent, *child = NULL;
int pid;
parent = cg_name(root, "cg_test_mkdir_A");
if (!parent)
goto cleanup;
child = cg_name(parent, "cg_test_mkdir_B");
if (!child)
goto cleanup;
if (cg_create(parent))
goto cleanup;
if (cg_freeze_wait(parent, true))
goto cleanup;
if (cg_create(child))
goto cleanup;
pid = cg_run_nowait(child, child_fn, NULL);
if (pid < 0)
goto cleanup;
if (cg_wait_for_proc_count(child, 1))
goto cleanup;
if (cg_check_frozen(child, true))
goto cleanup;
if (cg_check_frozen(parent, true))
goto cleanup;
ret = KSFT_PASS;
if (child)
if (parent)
return ret;
* The test creates two nested cgroups, freezes the parent
* and removes the child. Then it checks that the parent cgroup
......@@ -815,6 +868,7 @@ struct cgfreezer_test {
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