cgroup/cpuset: Include offline CPUs when tasks' cpumasks in top_cpuset are updated
Similar to commit 3fb906e7fa
("group/cpuset: Don't filter offline
CPUs in cpuset_cpus_allowed() for top cpuset tasks"), the whole set of
possible CPUs including offline ones should be used for setting cpumasks
for tasks in the top cpuset when a cpuset partition is modified as the
hotplug code won't update cpumasks for tasks in the top cpuset when
CPUs become online or offline.
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
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@ -1209,7 +1209,9 @@ void rebuild_sched_domains(void)
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*
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* Iterate through each task of @cs updating its cpus_allowed to the
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* effective cpuset's. As this function is called with cpuset_rwsem held,
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* cpuset membership stays stable.
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* cpuset membership stays stable. For top_cpuset, task_cpu_possible_mask()
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* is used instead of effective_cpus to make sure all offline CPUs are also
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* included as hotplug code won't update cpumasks for tasks in top_cpuset.
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*/
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static void update_tasks_cpumask(struct cpuset *cs, struct cpumask *new_cpus)
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{
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@ -1219,15 +1221,18 @@ static void update_tasks_cpumask(struct cpuset *cs, struct cpumask *new_cpus)
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css_task_iter_start(&cs->css, 0, &it);
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while ((task = css_task_iter_next(&it))) {
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const struct cpumask *possible_mask = task_cpu_possible_mask(task);
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if (top_cs) {
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/*
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* Percpu kthreads in top_cpuset are ignored
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*/
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if (top_cs && (task->flags & PF_KTHREAD) &&
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kthread_is_per_cpu(task))
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if ((task->flags & PF_KTHREAD) && kthread_is_per_cpu(task))
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continue;
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cpumask_and(new_cpus, cs->effective_cpus,
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task_cpu_possible_mask(task));
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cpumask_andnot(new_cpus, possible_mask, cs->subparts_cpus);
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} else {
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cpumask_and(new_cpus, possible_mask, cs->effective_cpus);
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}
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set_cpus_allowed_ptr(task, new_cpus);
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}
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css_task_iter_end(&it);
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