This makes pids.events:max affine to pids.max limit.
How are the new events supposed to be useful?
- pids.events.local:max - tells that cgroup's limit is hit (too tight?) - pids.events:* - "only" directs top-down search to cgroups of interest
Changes from v4 (https://lore.kernel.org/r/20240416142014.27630-1-mkoutny@suse.com) - rebased on cgroup/for-6.10 (rather cgroup/for-next, there's no rush) - introduce pids_files_legacy at one place (Tejun) - more descriptive Documentation/ (Tejun)
Changes from v3 (https://lore.kernel.org/r/20240405170548.15234-1-mkoutny@suse.com) - use existing functions for TAP output in selftest (Muhammad) - formatting in selftest (Muhammad) - remove pids.events:max.imposed event, keep it internal (Johannes) - allow legacy behavior with a mount option - detach migration charging patches - drop RFC prefix
Changes from v2 (https://lore.kernel.org/r/20200205134426.10570-1-mkoutny@suse.com) - implemented pids.events.local (Tejun) - added migration charging
[1] https://lore.kernel.org/r/20230202155626.1829121-1-hannes@cmpxchg.org/
Michal Koutný (5): cgroup/pids: Separate semantics of pids.events related to pids.max cgroup/pids: Make event counters hierarchical cgroup/pids: Add pids.events.local selftests: cgroup: Lexicographic order in Makefile selftests: cgroup: Add basic tests for pids controller
Documentation/admin-guide/cgroup-v1/pids.rst | 3 +- Documentation/admin-guide/cgroup-v2.rst | 21 ++- include/linux/cgroup-defs.h | 7 +- kernel/cgroup/cgroup.c | 15 +- kernel/cgroup/pids.c | 129 +++++++++++--- tools/testing/selftests/cgroup/.gitignore | 11 +- tools/testing/selftests/cgroup/Makefile | 25 +-- tools/testing/selftests/cgroup/test_pids.c | 178 +++++++++++++++++++ 8 files changed, 346 insertions(+), 43 deletions(-) create mode 100644 tools/testing/selftests/cgroup/test_pids.c
base-commit: 21c38a3bd4ee3fb7337d013a638302fb5e5f9dc2