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cgroup/cpuset: Make cpuset_attach_task() skip subpartitions CPUs for top_cpuset

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It is found that attaching a task to the top_cpuset does not currently
ignore CPUs allocated to subpartitions in cpuset_attach_task(). So the
code is changed to fix that.

Signed-off-by: Waiman Long <longman@redhat.com>
Reviewed-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Waiman Long 2023-04-11 09:36:00 -04:00 committed by Tejun Heo
parent eee8785379
commit 7e27cb6ad4
1 changed files with 2 additions and 1 deletions
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3
kernel/cgroup/cpuset.c
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@ -2535,7 +2535,8 @@ static void cpuset_attach_task(struct cpuset *cs, struct task_struct *task)
if (cs != &top_cpuset)
guarantee_online_cpus(task, cpus_attach);
else
cpumask_copy(cpus_attach, task_cpu_possible_mask(task));
cpumask_andnot(cpus_attach, task_cpu_possible_mask(task),
cs->subparts_cpus);
/*
* can_attach beforehand should guarantee that this doesn't
* fail. TODO: have a better way to handle failure here