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cgroup/cpuset: Skip task update if hotplug doesn't affect current cpuset

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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.

Signed-off-by: Waiman Long <longman@redhat.com>
Reviewed-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Waiman Long 2023-03-17 11:15:06 -04:00 committed by Tejun Heo
parent 5dcad50636
commit df59b72cd8
1 changed files with 3 additions and 0 deletions
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3
kernel/cgroup/cpuset.c
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@ -3516,6 +3516,8 @@ retry:
update_tasks:
cpus_updated = !cpumask_equal(&new_cpus, cs->effective_cpus);
mems_updated = !nodes_equal(new_mems, cs->effective_mems);
if (!cpus_updated && !mems_updated)
goto unlock; /* Hotplug doesn't affect this cpuset */
if (mems_updated)
check_insane_mems_config(&new_mems);
@ -3527,6 +3529,7 @@ update_tasks:
hotplug_update_tasks_legacy(cs, &new_cpus, &new_mems,
cpus_updated, mems_updated);
unlock:
percpu_up_write(&cpuset_rwsem);
}