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cgroup/cpuset: avoid unneeded cpuset_mutex re-lock
cpuset_mutex unlock and lock pair is only needed when transferring tasks out of empty cpuset. Avoid unneeded cpuset_mutex re-lock when !is_empty to save cpu cycles. Signed-off-by: Miaohe Lin <linmiaohe@huawei.com> Reviewed-by: Waiman Long <longman@redhat.com> Signed-off-by: Tejun Heo <tj@kernel.org>
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@ -3521,17 +3521,16 @@ hotplug_update_tasks_legacy(struct cpuset *cs,
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is_empty = cpumask_empty(cs->cpus_allowed) ||
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nodes_empty(cs->mems_allowed);
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mutex_unlock(&cpuset_mutex);
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/*
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* Move tasks to the nearest ancestor with execution resources,
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* This is full cgroup operation which will also call back into
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* cpuset. Should be done outside any lock.
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*/
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if (is_empty)
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if (is_empty) {
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mutex_unlock(&cpuset_mutex);
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remove_tasks_in_empty_cpuset(cs);
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mutex_lock(&cpuset_mutex);
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mutex_lock(&cpuset_mutex);
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}
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}
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static void
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