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Subject[PATCH v9 0/7] cgroup/cpuset: Add new cpuset partition type & empty effecitve cpus
Date
v9:
- Add a new patch 1 to remove the child cpuset restriction on parent's
"cpuset.cpus".
- Relax initial root partition entry limitation to allow cpuset.cpus to
overlap that of parent's.
- An "isolated invalid" displayed type is added to
cpuset.cpus.partition.
- Resetting partition root to "member" will leave child partition root
as invalid.
- Update documentation and test accordingly.

v8:
- Reorganize the patch series and rationalize the features and
constraints of a partition.
- Update patch descriptions and documentation accordingly.

v7:
- Simplify the documentation patch (patch 5) as suggested by Tejun.
- Fix a typo in patch 2 and improper commit log in patch 3.

This patchset includes one bug fix and four enhancements to the cpuset v2 code.

Patch 1: Allow parent to set "cpuset.cpus" that may not be a superset
of children's "cpuset.cpus" for default hierarchy.

Patch 2: Enable partition with no task to have empty cpuset.cpus.effective.

Patch 3: Refining the features and constraints of a cpuset partition
clarifying what changes are allowed.

Patch 4: 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 5: Enable the "cpuset.cpus.partition" file to show the reason
that causes invalid partition like "root invalid (No cpu available
due to hotplug)".

Patch 6 updates the cgroup-v2.rst file accordingly. Patch 7 adds a new
cpuset test to test the new cpuset partition code.

Waiman Long (7):
cgroup/cpuset: Don't let child cpusets restrict parent in default
hierarchy
cgroup/cpuset: Allow no-task partition to have empty
cpuset.cpus.effective
cgroup/cpuset: Refining features and constraints of a partition
cgroup/cpuset: Add a new isolated cpus.partition type
cgroup/cpuset: Show invalid partition reason string
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 | 168 +++--
kernel/cgroup/cpuset.c | 440 +++++++-----
tools/testing/selftests/cgroup/Makefile | 5 +-
.../selftests/cgroup/test_cpuset_prs.sh | 667 ++++++++++++++++++
tools/testing/selftests/cgroup/wait_inotify.c | 87 +++
5 files changed, 1142 insertions(+), 225 deletions(-)
create mode 100755 tools/testing/selftests/cgroup/test_cpuset_prs.sh
create mode 100644 tools/testing/selftests/cgroup/wait_inotify.c

--
2.27.0

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