linux-kernel - [PATCH v8 0/6] cgroup/cpuset: Add new cpuset partition type & empty effecitve cpus

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Date:   Mon, 18 Oct 2021 10:36:13 -0400
From:   Waiman Long <longman@...hat.com>
To:     Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>
Cc:     cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <guro@...com>, Phil Auld <pauld@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Michal Koutný <mkoutny@...e.com>,
        Waiman Long <longman@...hat.com>
Subject: [PATCH v8 0/6] cgroup/cpuset: Add new cpuset partition type & empty effecitve cpus

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.

v6:
 - Remove duplicated tmpmask from update_prstate() which should fix the
   frame size too large problem reported by kernel test robot.

This patchset makes four enhancements to the cpuset v2 code.

 Patch 1: Enable partition with no task to have empty cpuset.cpus.effective.

 Patch 2: Refining the features and constraints of a cpuset partition
 clarifying what changes are allowed.

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

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: 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       | 153 ++--
 kernel/cgroup/cpuset.c                        | 393 +++++++----
 tools/testing/selftests/cgroup/Makefile       |   5 +-
 .../selftests/cgroup/test_cpuset_prs.sh       | 664 ++++++++++++++++++
 tools/testing/selftests/cgroup/wait_inotify.c |  87 +++
 5 files changed, 1115 insertions(+), 187 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