cgroup/cpuset: Improve temporary cpumasks handling

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The limitation that update_parent_subparts_cpumask() can only use
addmask & delmask in the given tmp cpumasks is fragile and may lead to
unexpected error.

Fix this problem by allocating/freeing a struct tmpmasks in
update_cpumask() to avoid reusing the cpumasks in trial_cs.

With this change, we can move the update_tasks_cpumask() for the
parent and update_sibling_cpumasks() for the sibling to inside
update_parent_subparts_cpumask().

Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

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Waiman Long 2023-06-27 10:35:02 -04:00 • committed by Tejun Heo

parent a86ce68078

commit 99fe36ba6f

1 changed files with 13 additions and 29 deletions

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kernel/cgroup/cpuset.c

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