cpuset: introduce effective_{cpumask|nodemask}_cpuset()

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effective_cpumask_cpuset() returns an ancestor cpuset which has
non-empty cpumask.

If a cpuset is empty and the tasks in it need to update their
cpus_allowed, they take on the ancestor cpuset's cpumask.

This currently won't change any behavior, but it will later allow us
to keep tasks in empty cpusets.

Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

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Li Zefan 2013-06-09 17:15:22 +08:00 • committed by Tejun Heo

parent 33ad801dfb

commit 070b57fcac

1 changed files with 65 additions and 11 deletions

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kernel/cpuset.c

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