kernel/linux.git/tools/testing/selftests/cgroup, branch v5.16.1

selftests: cgroup: Test open-time cgroup namespace usage for migration checks

2022-01-06T21:02:29+00:00

When a task is writing to an fd opened by a different task, the perm check should use the cgroup namespace of the latter task. Add a test for it. Tested-by: Michal Koutný Signed-off-by: Tejun Heo

selftests: cgroup: Test open-time credential usage for migration checks

2022-01-06T21:02:29+00:00

When a task is writing to an fd opened by a different task, the perm check should use the credentials of the latter task. Add a test for it. Tested-by: Michal Koutný Signed-off-by: Tejun Heo

selftests: cgroup: Make cg_create() use 0755 for permission instead of 0644

2022-01-06T21:02:29+00:00

0644 is an odd perm to create a cgroup which is a directory. Use the regular 0755 instead. This is necessary for euid switching test case. Reviewed-by: Michal Koutný Signed-off-by: Tejun Heo

tests/cgroup: test cgroup.kill

2021-05-10T14:41:11+00:00

Test that the new cgroup.kill feature works as intended. Link: https://lore.kernel.org/r/20210503143922.3093755-5-brauner@kernel.org Cc: Shakeel Butt Cc: Tejun Heo Cc: cgroups@vger.kernel.org Acked-by: Roman Gushchin Signed-off-by: Christian Brauner Signed-off-by: Tejun Heo

tests/cgroup: move cg_wait_for(), cg_prepare_for_wait()

2021-05-10T14:41:11+00:00

as they will be used by the tests for cgroup killing. Link: https://lore.kernel.org/r/20210503143922.3093755-4-brauner@kernel.org Cc: Tejun Heo Cc: cgroups@vger.kernel.org Reviewed-by: Shakeel Butt Acked-by: Roman Gushchin Signed-off-by: Christian Brauner Signed-off-by: Tejun Heo

tests/cgroup: use cgroup.kill in cg_killall()

2021-05-10T14:41:10+00:00

If cgroup.kill file is supported make use of it. Link: https://lore.kernel.org/r/20210503143922.3093755-3-brauner@kernel.org Cc: Tejun Heo Cc: cgroups@vger.kernel.org Reviewed-by: Shakeel Butt Acked-by: Roman Gushchin Signed-off-by: Christian Brauner Signed-off-by: Tejun Heo

kselftests: cgroup: update kmem test for new vmstat implementation

2021-04-30T18:20:38+00:00

With memcg having switched to rstat, memory.stat output is precise. Update the cgroup selftest to reflect the expectations and error tolerances of the new implementation. Also add newly tracked types of memory to the memory.stat side of the equation, since they're included in memory.current and could throw false positives. Link: https://lkml.kernel.org/r/20210209163304.77088-9-hannes@cmpxchg.org Signed-off-by: Johannes Weiner Reviewed-by: Shakeel Butt Reviewed-by: Michal Koutný Acked-by: Roman Gushchin Cc: Michal Hocko Cc: Tejun Heo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

selftests/cgroup: Fix build on older distros

2020-11-10T22:13:25+00:00

On older distros struct clone_args does not have a cgroup member, leading to build errors: cgroup_util.c: In function 'clone_into_cgroup': cgroup_util.c:343:4: error: 'struct clone_args' has no member named 'cgroup' cgroup_util.c:346:33: error: invalid application of 'sizeof' to incomplete type 'struct clone_args' But the selftests already have a locally defined version of the structure which is up to date, called __clone_args. So use __clone_args which fixes the error. Signed-off-by: Michael Ellerman Signed-off-by: Sachin Sant > Acked-by: Christian Brauner Signed-off-by: Shuah Khan

kselftests: cgroup: add perpcu memory accounting test

2020-08-12T17:57:55+00:00

Add a simple test to check the percpu memory accounting. The test creates a cgroup tree with 1000 child cgroups and checks values of memory.current and memory.stat::percpu. Signed-off-by: Roman Gushchin Signed-off-by: Andrew Morton Cc: Christoph Lameter Cc: David Rientjes Cc: Dennis Zhou Cc: Johannes Weiner Cc: Joonsoo Kim Cc: Mel Gorman Cc: Michal Hocko Cc: Pekka Enberg Cc: Shakeel Butt Cc: Tejun Heo Cc: Tobin C. Harding Cc: Vlastimil Babka Cc: Waiman Long Cc: Michal Koutný Cc: Bixuan Cui Cc: Stephen Rothwell Link: http://lkml.kernel.org/r/20200608230819.832349-6-guro@fb.com Signed-off-by: Linus Torvalds

kselftests: cgroup: add kernel memory accounting tests

2020-08-07T18:33:25+00:00

Add some tests to cover the kernel memory accounting functionality. These are covering some issues (and changes) we had recently. 1) A test which allocates a lot of negative dentries, checks memcg slab statistics, creates memory pressure by setting memory.max to some low value and checks that some number of slabs was reclaimed. 2) A test which covers side effects of memcg destruction: it creates and destroys a large number of sub-cgroups, each containing a multi-threaded workload which allocates and releases some kernel memory. Then it checks that the charge ans memory.stats do add up on the parent level. 3) A test which reads /proc/kpagecgroup and implicitly checks that it doesn't crash the system. 4) A test which spawns a large number of threads and checks that the kernel stacks accounting works as expected. 5) A test which checks that living charged slab objects are not preventing the memory cgroup from being released after being deleted by a user. Signed-off-by: Roman Gushchin Signed-off-by: Andrew Morton Cc: Christoph Lameter Cc: Johannes Weiner Cc: Michal Hocko Cc: Shakeel Butt Cc: Tejun Heo Cc: Vlastimil Babka Link: http://lkml.kernel.org/r/20200623174037.3951353-19-guro@fb.com Signed-off-by: Linus Torvalds