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

Phil Auld
2021-06-10T14:20:13Z

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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