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cpuset: Don't always flush cpuset_migrate_mm_wq in cpuset_write_resmask

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It is unnecessary to always wait for the flush operation of
cpuset_migrate_mm_wq to complete in cpuset_write_resmask, as modifying
cpuset.cpus or cpuset.exclusive does not trigger mm migrations. The
flush_workqueue can be executed only when cpuset.mems is modified.

Signed-off-by: Chuyi Zhou <zhouchuyi@bytedance.com>
Reviewed-by: Michal Koutný <mkoutny@suse.com>
Reviewed-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Chuyi Zhou 2025-09-04 15:45:03 +08:00 committed by Tejun Heo
parent e117ff1129
commit c0fb16ef88
1 changed files with 2 additions and 1 deletions
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3
kernel/cgroup/cpuset.c
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@ -3291,7 +3291,8 @@ ssize_t cpuset_write_resmask(struct kernfs_open_file *of,
rebuild_sched_domains_locked();
out_unlock:
cpuset_full_unlock();
flush_workqueue(cpuset_migrate_mm_wq);
if (of_cft(of)->private == FILE_MEMLIST)
flush_workqueue(cpuset_migrate_mm_wq);
return retval ?: nbytes;
}