v4:
- Rebased to the for-5.15 branch of cgroup git tree and dropped the
first 3 patches of v3 series which have been merged.
- Beside prohibiting violation of cpu exclusivity rule, allow arbitrary
changes to cpuset.cpus of a partition root and force the partition root
to become invalid in case any of the partition root constraints
are violated. The documentation file and self test are modified
accordingly.
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 makes four enhancements to the cpuset v2 code.
Patch 1: Enable event notification on "cpuset.cpus.partition" whenever
the state of a partition changes.
Patch 2: Properly handle partition root tree and make partition
invalid in case changes to cpuset.cpus violate any of the partition
root constraints.
Patch 3: 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 4: 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 5 updates the cgroup-v2.rst file accordingly. Patch 6 adds a new
cpuset test to test the new cpuset partition code.
Waiman Long (6):
cgroup/cpuset: Enable event notification when partition state changes
cgroup/cpuset: Properly handle partition root tree
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 | 104 +--
kernel/cgroup/cpuset.c | 282 +++++---
tools/testing/selftests/cgroup/Makefile | 5 +-
.../selftests/cgroup/test_cpuset_prs.sh | 632 ++++++++++++++++++
tools/testing/selftests/cgroup/wait_inotify.c | 86 +++
5 files changed, 980 insertions(+), 129 deletions(-)
create mode 100755 tools/testing/selftests/cgroup/test_cpuset_prs.sh
create mode 100644 tools/testing/selftests/cgroup/wait_inotify.c
--
2.18.1
