Re: [PATCH 1/5] cgroup/cpuset: Skip task update if hotplug doesn't affect current cpuset

[Michal Koutný]

On Mon, Mar 06, 2023 at 03:08:45PM -0500, Waiman Long <longman@xxxxxxxxxx> wrote:
> If a hotplug event doesn't affect the current cpuset, there is no point
> to call hotplug_update_tasks() or hotplug_update_tasks_legacy(). So
> just skip it.

This skips "insane" modification of cs->cpus_allowed in
hotplug_update_tasks_legacy() but assuming cs->cpus_allowed is kept in
sync with cs->effective_cpus on v1, it is OK to skip the update based
only on effective_cpus check.

Hence,

>  kernel/cgroup/cpuset.c | 3 +++
>  1 file changed, 3 insertions(+)

Reviewed-by: Michal Koutný <mkoutny@xxxxxxxx>

Attachment: signature.asc
Description: PGP signature