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Tue, 17 Jun 2025 06:37:15 -0700 (PDT) From: =?UTF-8?q?Michal=20Koutn=C3=BD?= To: cgroups@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Cc: =?UTF-8?q?Michal=20Koutn=C3=BD?= , Tejun Heo , Johannes Weiner , Shuah Khan Subject: [PATCH 2/4] selftests: cgroup: Add support for named v1 hierarchies in test_core Date: Tue, 17 Jun 2025 15:36:54 +0200 Message-ID: <20250617133701.400095-3-mkoutny@suse.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250617133701.400095-1-mkoutny@suse.com> References: <20250617133701.400095-1-mkoutny@suse.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable This comes useful when using selftests from mainline on older kernels/setups that still rely on cgroup v1. The core tests that rely on v2 specific features are skipped, the remaining ones are adjusted to work with a v1 hierarchy. The expected output on v1 system: ok 1 # SKIP test_cgcore_internal_process_constraint ok 2 # SKIP test_cgcore_top_down_constraint_enable ok 3 # SKIP test_cgcore_top_down_constraint_disable ok 4 # SKIP test_cgcore_no_internal_process_constraint_on_threads ok 5 # SKIP test_cgcore_parent_becomes_threaded ok 6 # SKIP test_cgcore_invalid_domain ok 7 # SKIP test_cgcore_populated ok 8 test_cgcore_proc_migration ok 9 test_cgcore_thread_migration ok 10 test_cgcore_destroy ok 11 test_cgcore_lesser_euid_open ok 12 # SKIP test_cgcore_lesser_ns_open Signed-off-by: Michal Koutn=C3=BD --- tools/testing/selftests/cgroup/test_core.c | 31 ++++++++++++++++++---- 1 file changed, 26 insertions(+), 5 deletions(-) diff --git a/tools/testing/selftests/cgroup/test_core.c b/tools/testing/sel= ftests/cgroup/test_core.c index 0c4cc4e5fc8c2..338e276aae5da 100644 --- a/tools/testing/selftests/cgroup/test_core.c +++ b/tools/testing/selftests/cgroup/test_core.c @@ -148,6 +148,9 @@ static int test_cgcore_populated(const char *root) int cgroup_fd =3D -EBADF; pid_t pid; =20 + if (cg_test_v1_named) + return KSFT_SKIP; + cg_test_a =3D cg_name(root, "cg_test_a"); cg_test_b =3D cg_name(root, "cg_test_a/cg_test_b"); cg_test_c =3D cg_name(root, "cg_test_a/cg_test_b/cg_test_c"); @@ -277,6 +280,9 @@ static int test_cgcore_invalid_domain(const char *root) int ret =3D KSFT_FAIL; char *grandparent =3D NULL, *parent =3D NULL, *child =3D NULL; =20 + if (cg_test_v1_named) + return KSFT_SKIP; + grandparent =3D cg_name(root, "cg_test_grandparent"); parent =3D cg_name(root, "cg_test_grandparent/cg_test_parent"); child =3D cg_name(root, "cg_test_grandparent/cg_test_parent/cg_test_child= "); @@ -339,6 +345,9 @@ static int test_cgcore_parent_becomes_threaded(const ch= ar *root) int ret =3D KSFT_FAIL; char *parent =3D NULL, *child =3D NULL; =20 + if (cg_test_v1_named) + return KSFT_SKIP; + parent =3D cg_name(root, "cg_test_parent"); child =3D cg_name(root, "cg_test_parent/cg_test_child"); if (!parent || !child) @@ -378,7 +387,8 @@ static int test_cgcore_no_internal_process_constraint_o= n_threads(const char *roo int ret =3D KSFT_FAIL; char *parent =3D NULL, *child =3D NULL; =20 - if (cg_read_strstr(root, "cgroup.controllers", "cpu") || + if (cg_test_v1_named || + cg_read_strstr(root, "cgroup.controllers", "cpu") || cg_write(root, "cgroup.subtree_control", "+cpu")) { ret =3D KSFT_SKIP; goto cleanup; @@ -430,6 +440,9 @@ static int test_cgcore_top_down_constraint_enable(const= char *root) int ret =3D KSFT_FAIL; char *parent =3D NULL, *child =3D NULL; =20 + if (cg_test_v1_named) + return KSFT_SKIP; + parent =3D cg_name(root, "cg_test_parent"); child =3D cg_name(root, "cg_test_parent/cg_test_child"); if (!parent || !child) @@ -465,6 +478,9 @@ static int test_cgcore_top_down_constraint_disable(cons= t char *root) int ret =3D KSFT_FAIL; char *parent =3D NULL, *child =3D NULL; =20 + if (cg_test_v1_named) + return KSFT_SKIP; + parent =3D cg_name(root, "cg_test_parent"); child =3D cg_name(root, "cg_test_parent/cg_test_child"); if (!parent || !child) @@ -506,6 +522,9 @@ static int test_cgcore_internal_process_constraint(cons= t char *root) int ret =3D KSFT_FAIL; char *parent =3D NULL, *child =3D NULL; =20 + if (cg_test_v1_named) + return KSFT_SKIP; + parent =3D cg_name(root, "cg_test_parent"); child =3D cg_name(root, "cg_test_parent/cg_test_child"); if (!parent || !child) @@ -642,10 +661,12 @@ static int test_cgcore_thread_migration(const char *r= oot) if (cg_create(grps[2])) goto cleanup; =20 - if (cg_write(grps[1], "cgroup.type", "threaded")) - goto cleanup; - if (cg_write(grps[2], "cgroup.type", "threaded")) - goto cleanup; + if (!cg_test_v1_named) { + if (cg_write(grps[1], "cgroup.type", "threaded")) + goto cleanup; + if (cg_write(grps[2], "cgroup.type", "threaded")) + goto cleanup; + } =20 if (cg_enter_current(grps[1])) goto cleanup; --=20 2.49.0