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Commit 44e9d308 authored by Roman Gushchin's avatar Roman Gushchin Committed by Tejun Heo
Browse files

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
state.

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 <guro@fb.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 505a8ec7

tools/testing/selftests/cgroup/test_freezer.c

+54 −0
Original line number Diff line number Diff line
@@ -447,6 +447,59 @@ static int test_cgfreezer_forkbomb(const char *root) 
	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;



cleanup:

	if (child)

		cg_destroy(child);

	free(child);

	if (parent)

		cg_destroy(parent);

	free(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 { 
	T(test_cgfreezer_simple),

	T(test_cgfreezer_tree),

	T(test_cgfreezer_forkbomb),

	T(test_cgfreezer_mkdir),

	T(test_cgfreezer_rmdir),

	T(test_cgfreezer_migrate),

	T(test_cgfreezer_ptrace),