Re: [PATCH v9 0/7] cgroup/cpuset: Add new cpuset partition type & empty effecitve cpus

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On 12/5/21 13:32, Waiman Long wrote:
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

Hi,

Is this patch series good enough or is there other changes you would still like to make in this series?

Cheers,
Longman




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