Commit 7e27cb6a authored Apr 11, 2023 by Waiman Long Committed by Tejun Heo Apr 12, 2023

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



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>

parent eee87853

kernel/cgroup/cpuset.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -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