diff options
| author | Waiman Long <longman@redhat.com> | 2023-03-17 11:15:06 -0400 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2023-03-29 08:41:28 -1000 |
| commit | df59b72cd8fb8ca00301f47e65853efed195d23f (patch) | |
| tree | 6ac2295dc3f69a2d39c873564a7bdc37a08a2647 /kernel/cgroup | |
| parent | 5dcad50636a5d416135bafae86fc4979b911a7c6 (diff) | |
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: Waiman Long <longman@redhat.com>
Reviewed-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel/cgroup')
| -rw-r--r-- | kernel/cgroup/cpuset.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index 8472c711eb1b..a05bc93215ac 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -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); } |