Commit df59b72c authored by Waiman Long's avatar Waiman Long Committed by Tejun Heo
Browse files

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



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: default avatarWaiman Long <longman@redhat.com>
Reviewed-by: default avatarMichal Koutný <mkoutny@suse.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 5dcad506

kernel/cgroup/cpuset.c

+3 −0
Original line number Diff line number Diff line
@@ -3516,6 +3516,8 @@ static void cpuset_hotplug_update_tasks(struct cpuset *cs, struct tmpmasks *tmp) 
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 @@ static void cpuset_hotplug_update_tasks(struct cpuset *cs, struct tmpmasks *tmp) 
		hotplug_update_tasks_legacy(cs, &new_cpus, &new_mems,

					    cpus_updated, mems_updated);



unlock:

	percpu_up_write(&cpuset_rwsem);

}