linux-kernel - Re: [PATCH 0/5] cgroup/cpuset: Enable cpuset partition with no load balancing

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Message-ID: <YMIfg0Aa2HZQPEy+@lorien.usersys.redhat.com>
Date:   Thu, 10 Jun 2021 10:19:47 -0400
From:   Phil Auld <pauld@...hat.com>
To:     Waiman Long <longman@...hat.com>
Cc:     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>, 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>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>
Subject: Re: [PATCH 0/5] cgroup/cpuset: Enable cpuset partition with no load
 balancing

Hi Waiman,

On Thu, Jun 03, 2021 at 05:24:11PM -0400 Waiman Long wrote:
> This patchset makes the following two major changes to the cpuset v2 code:
> 
>  Patch 2: Add a new partition state "root-nolb" to create a partition
>  root with load balancing disabled. This is for handling intermitten
>  workloads that have a strict low latency requirement.
> 
>  Patch 3: 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.

Thanks!  This looks like it will be a usable replacement for the functionality
lost when SD_LOAD_BALANCE went away.


Cheers,
Phil

> 
> Patch 4 updates the cgroup-v2.rst file accordingly. Patch 5 adds a test
> to test the new cpuset partition code.
> 
> Waiman Long (5):
>   cgroup/cpuset: Don't call validate_change() for some flag changes
>   cgroup/cpuset: Add new cpus.partition type with no load balancing
>   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       |  19 ++-
>  kernel/cgroup/cpuset.c                        | 124 +++++++++++----
>  tools/testing/selftests/cgroup/Makefile       |   2 +-
>  .../selftests/cgroup/test_cpuset_prs.sh       | 141 ++++++++++++++++++
>  4 files changed, 247 insertions(+), 39 deletions(-)
>  create mode 100755 tools/testing/selftests/cgroup/test_cpuset_prs.sh
> 
> -- 
> 2.18.1
> 

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