Currently, when pids.max limit is breached in the hierarchy, the event is counted and reported in the cgroup where the forking task resides. This isn't hierarchical neither binds event to its limit Reasons for RFC: 1) Introduction of new event type. 2) Missing one step further would be to distinguish pids.events and pids.events.local. Changes from v1: https://lkml.kernel.org/r/20191128172612.10259-1-mkoutny@xxxxxxxx - introduce two separate types of events - make event counting hierarchical Michal Koutný (3): cgroup/pids: Separate semantics of pids.events related to pids.max cgroup/pids: Make event counters hierarchical selftests: cgroup: Add basic tests for pids controller Documentation/admin-guide/cgroup-v1/pids.rst | 3 +- Documentation/admin-guide/cgroup-v2.rst | 14 ++ kernel/cgroup/pids.c | 92 +++++++-- tools/testing/selftests/cgroup/Makefile | 8 +- tools/testing/selftests/cgroup/test_pids.c | 188 +++++++++++++++++++ 5 files changed, 288 insertions(+), 17 deletions(-) create mode 100644 tools/testing/selftests/cgroup/test_pids.c -- 2.24.1
