linux-stable.git/tools/testing/selftests/cgroup, branch linux-6.6.y

selftest: memcg: skip memcg_sock test if address family not supported

2026-05-23T11:03:14+00:00

[ Upstream commit 2d028f3e4bbbfd448928a8d3d2814b0b04c214f4 ]

The test_memcg_sock test in memcontrol.c sets up an IPv6 socket and send
data over it to consume memory and verify that memory.stat.sock and
memory.current values are close.

On systems where IPv6 isn't enabled or not configured to support
SOCK_STREAM, the test_memcg_sock test always fails.  When the socket()
call fails, there is no way we can test the memory consumption and verify
the above claim.  I believe it is better to just skip the test in this
case instead of reporting a test failure hinting that there may be
something wrong with the memcg code.

Link: https://lkml.kernel.org/r/20260311200526.885899-1-longman@redhat.com
Fixes: 5f8f019380b8 ("selftests: cgroup/memcontrol: add basic test for socket accounting")
Signed-off-by: Waiman Long 
Acked-by: Michal Koutný 
Acked-by: Shakeel Butt 
Cc: Johannes Weiner 
Cc: Michal Hocko 
Cc: Michal Koutný 
Cc: Mike Rapoport 
Cc: Muchun Song 
Cc: Roman Gushchin 
Cc: Shuah Khan 
Cc: Tejun Heo 
Signed-off-by: Andrew Morton 
Signed-off-by: Sasha Levin

selftests: cgroup: skip test_cgcore_lesser_ns_open when cgroup2 mounted without nsdelegate

2024-06-12T09:12:00+00:00

[ Upstream commit 4793cb599b1bdc3d356f0374c2c99ffe890ae876 ]

The test case test_cgcore_lesser_ns_open only tasks effect when cgroup2
is mounted with "nsdelegate" mount option. If it misses this option, or
is remounted without "nsdelegate", the test case will fail. For example,
running bpf/test_cgroup_storage first, and then run cgroup/test_core will
fail on test_cgcore_lesser_ns_open. Skip it if "nsdelegate" is not
detected in cgroup2 mount options.

Fixes: bf35a7879f1d ("selftests: cgroup: Test open-time cgroup namespace usage for migration checks")
Signed-off-by: Tianchen Ding 
Reviewed-by: Muhammad Usama Anjum 
Signed-off-by: Tejun Heo 
Signed-off-by: Sasha Levin

Merge tag 'cgroup-for-6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

2023-09-01T22:58:21+00:00

Pull cgroup updates from Tejun Heo:

 - Per-cpu cpu usage stats are now tracked

   This currently isn't printed out in the cgroupfs interface and can
   only be accessed through e.g. BPF. Should decide on a not-too-ugly
   way to show per-cpu stats in cgroupfs

 - cpuset received some cleanups and prepatory patches for the pending
   cpus.exclusive patchset which will allow cpuset partitions to be
   created below non-partition parents, which should ease the management
   of partition cpusets

 - A lot of code and documentation cleanup patches

 - tools/testing/selftests/cgroup/test_cpuset.c added

* tag 'cgroup-for-6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup: (32 commits)
  cgroup: Avoid -Wstringop-overflow warnings
  cgroup:namespace: Remove unused cgroup_namespaces_init()
  cgroup/rstat: Record the cumulative per-cpu time of cgroup and its descendants
  cgroup: clean up if condition in cgroup_pidlist_start()
  cgroup: fix obsolete function name in cgroup_destroy_locked()
  Documentation: cgroup-v2.rst: Correct number of stats entries
  cgroup: fix obsolete function name above css_free_rwork_fn()
  cgroup/cpuset: fix kernel-doc
  cgroup: clean up printk()
  cgroup: fix obsolete comment above cgroup_create()
  docs: cgroup-v1: fix typo
  docs: cgroup-v1: correct the term of Page Cache organization in inode
  cgroup/misc: Store atomic64_t reads to u64
  cgroup/misc: Change counters to be explicit 64bit types
  cgroup/misc: update struct members descriptions
  cgroup: remove cgrp->kn check in css_populate_dir()
  cgroup: fix obsolete function name
  cgroup: use cached local variable parent in for loop
  cgroup: remove obsolete comment above struct cgroupstats
  cgroup: put cgroup_tryget_css() inside CONFIG_CGROUP_SCHED
  ...

selftests: cgroup: fix test_kmem_memcg_deletion kernel mem check

2023-08-24T23:20:27+00:00

Currently, not all kernel memory usage is being accounted for. This
commit switches to using the kernel entry within memory.stat which
already includes kernel_stack, pagetables, and slab. The kernel entry
also includes vmalloc and other additional kernel memory use cases which
were missing.

Link: https://lkml.kernel.org/r/bvrhe2tpsts2azaroq4ubp2slawmop6orndsswrewuscw3ugvk@kmemmrttsnc7
Signed-off-by: Lucas Karpinski 
Acked-by: Shakeel Butt 
Acked-by: Roman Gushchin 
Cc: Johannes Weiner 
Cc: Michal Hocko 
Cc: Muchun Song 
Cc: Shuah Khan 
Cc: Tejun Heo 
Cc: Zefan Li 
Signed-off-by: Andrew Morton

merge mm-hotfixes-stable into mm-stable to pick up depended-upon changes

2023-08-21T21:26:20+00:00

selftests: cgroup: fix test_kmem_basic less than error

2023-08-21T20:07:21+00:00

test_kmem_basic creates 100,000 negative dentries, with each one mapping
to a slab object.  After memory.high is set, these are reclaimed through
the shrink_slab function call which reclaims all 100,000 entries.  The
test passes the majority of the time because when slab1 or current is
calculated, it is often above 0, however, 0 is also an acceptable value.

Link: https://lkml.kernel.org/r/7d6gcuyzdjcice6qbphrmpmv5skr5jtglg375unnjxqhstvhxc@qkn6dw6bao6v
Signed-off-by: Lucas Karpinski 
Cc: Johannes Weiner 
Cc: Michal Hocko 
Cc: Muchun Song 
Cc: Roman Gushchin 
Cc: Shakeel Butt 
Cc: Shuah Khan 
Cc: Tejun Heo 
Cc: Zefan Li 
Signed-off-by: Andrew Morton

selftests: cgroup: add zswap-memcg unwanted writeback test

2023-08-18T17:12:09+00:00

Add a test to verify that when a memcg hits its limit in zswap, it doesn't
trigger an unwanted writeback that would result in pages not owned by that
memcg to be sent to disk, even if zswap isn't full.  This was fixed by
commit 0bdf0efa180a("zswap: do not shrink if cgroup may not zswap").

Link: https://lkml.kernel.org/r/20230621153548.428093-4-cerasuolodomenico@gmail.com
Signed-off-by: Domenico Cerasuolo 
Cc: Dan Streetman 
Cc: Johannes Weiner 
Cc: Michal Hocko 
Cc: Muchun Song 
Cc: Nhat Pham 
Cc: Rik van Riel 
Cc: Roman Gushchin 
Cc: Seth Jennings 
Cc: Shakeel Butt 
Cc: Shuah Khan 
Cc: Tejun Heo 
Cc: Vitaly Wool 
Cc: Zefan Li 
Signed-off-by: Andrew Morton

selftests: cgroup: add test_zswap with no kmem bypass test

2023-08-18T17:12:08+00:00

Add a cgroup selftest that verifies memcg charging in zswap.  The original
issue was that kmem bypass was applied to pages swapped out to zswap by
kswapd, resulting in zswapped memory not being charged.  It was fixed by
commit cd08d80ecdac("mm: correctly charge compressed memory to its
memcg").

Link: https://lkml.kernel.org/r/20230621153548.428093-3-cerasuolodomenico@gmail.com
Signed-off-by: Domenico Cerasuolo 
Cc: Dan Streetman 
Cc: Johannes Weiner 
Cc: Michal Hocko 
Cc: Muchun Song 
Cc: Nhat Pham 
Cc: Rik van Riel 
Cc: Roman Gushchin 
Cc: Seth Jennings 
Cc: Shakeel Butt 
Cc: Shuah Khan 
Cc: Tejun Heo 
Cc: Vitaly Wool 
Cc: Zefan Li 
Signed-off-by: Andrew Morton

selftests: cgroup: add test_zswap program

2023-08-18T17:12:08+00:00

Patch series "selftests: cgroup: add zswap test program".

This series adds 2 zswap related selftests that verify known and fixed
issues.  A new dedicated test program (test_zswap) is proposed since the
test cases are specific to zswap and hosts specific helpers.

The first patch adds the (empty) test program, while the other 2 add an
actual test function each.


This patch (of 3):

Add empty cgroup-zswap self test scaffold program, test functions to be
added in the next commits.

Link: https://lkml.kernel.org/r/20230621153548.428093-1-cerasuolodomenico@gmail.com
Link: https://lkml.kernel.org/r/20230621153548.428093-2-cerasuolodomenico@gmail.com
Signed-off-by: Domenico Cerasuolo 
Cc: Dan Streetman 
Cc: Johannes Weiner 
Cc: Michal Hocko 
Cc: Muchun Song 
Cc: Nhat Pham 
Cc: Rik van Riel 
Cc: Roman Gushchin 
Cc: Seth Jennings 
Cc: Shakeel Butt 
Cc: Shuah Khan 
Cc: Tejun Heo 
Cc: Vitaly Wool 
Cc: Zefan Li 
Signed-off-by: Andrew Morton

selftests: cgroup: fix test_kmem_basic false positives

2023-08-04T20:03:42+00:00

This test fails routinely in our prod testing environment, and I can
reproduce it locally as well.

The test allocates dcache inside a cgroup, then drops the memory limit
and checks that usage drops correspondingly. The reason it fails is
because dentries are freed with an RCU delay - a debugging sleep shows
that usage drops as expected shortly after.

Insert a 1s sleep after dropping the limit. This should be good
enough, assuming that machines running those tests are otherwise not
very busy.

Link: https://lkml.kernel.org/r/20230801135632.1768830-1-hannes@cmpxchg.org
Signed-off-by: Johannes Weiner 
Acked-by: Paul E. McKenney 
Cc: Michal Hocko 
Cc: Roman Gushchin 
Signed-off-by: Andrew Morton