[PATCH v2 0/6] cgroup/cpuset: Add new cpuset partition type & empty effecitve cpus

Waiman Long
2021-06-21T18:49:18Z

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 the following three major changes to the cpuset v2 code:

Patch 2: 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 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 5 adds a new
cpuset test to test the new cpuset partition code.

Waiman Long (6):
cgroup/cpuset: Miscellaneous code cleanup
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 | 65 +-
kernel/cgroup/cpuset.c | 285 ++++++---
tools/testing/selftests/cgroup/Makefile | 2 +-
.../selftests/cgroup/test_cpuset_prs.sh | 558 ++++++++++++++++++
4 files changed, 794 insertions(+), 116 deletions(-)
create mode 100755 tools/testing/selftests/cgroup/test_cpuset_prs.sh

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2.18.1