v3: - Add two new patches (patches 2 & 3) to fix bugs found during the testing process. - Add a new patch to enable inotify event notification when partition become invalid. - Add a test to test event notification when partition become invalid.
v2: - Drop v1 patch 1. - Break out some cosmetic changes into a separate patch (patch #1). - Add a new patch to clarify the transition to invalid partition root is mainly caused by hotplug events. - Enhance the partition root state test including CPU online/offline behavior and fix issues found by the test.
This patchset fixes two bugs and makes four enhancements to the cpuset v2 code.
Bug fixes:
Patch 2: Fix a hotplug handling bug when just all cpus in subparts_cpus are offlined.
Patch 3: Fix violation of cpuset locking rule.
Enhancements:
Patch 4: Enable event notification on "cpuset.cpus.partition" when a partition become invalid.
Patch 5: Clarify the use of invalid partition root and add new checks to make sure that normal cpuset control file operations will not be allowed to create invalid partition root. It also fixes some of the issues in existing code.
Patch 6: Add a new partition state "isolated" to create a partition root without load balancing. This is for handling intermitten workloads that have a strict low latency requirement.
Patch 7: Allow partition roots that are not the top cpuset to distribute all its cpus to child partitions as long as there is no task associated with that partition root. This allows more flexibility for middleware to manage multiple partitions.
Patch 8 updates the cgroup-v2.rst file accordingly. Patch 9 adds a new cpuset test to test the new cpuset partition code.
Waiman Long (9): cgroup/cpuset: Miscellaneous code cleanup cgroup/cpuset: Fix a partition bug with hotplug cgroup/cpuset: Fix violation of cpuset locking rule cgroup/cpuset: Enable event notification when partition become invalid cgroup/cpuset: Clarify the use of invalid partition root cgroup/cpuset: Add a new isolated cpus.partition type cgroup/cpuset: Allow non-top parent partition root to distribute out all CPUs cgroup/cpuset: Update description of cpuset.cpus.partition in cgroup-v2.rst kselftest/cgroup: Add cpuset v2 partition root state test
Documentation/admin-guide/cgroup-v2.rst | 94 ++- kernel/cgroup/cpuset.c | 360 +++++++--- tools/testing/selftests/cgroup/Makefile | 5 +- .../selftests/cgroup/test_cpuset_prs.sh | 626 ++++++++++++++++++ tools/testing/selftests/cgroup/wait_inotify.c | 67 ++ 5 files changed, 1007 insertions(+), 145 deletions(-) create mode 100755 tools/testing/selftests/cgroup/test_cpuset_prs.sh create mode 100644 tools/testing/selftests/cgroup/wait_inotify.c