sched/cpuset: Bring back cpuset_mutex

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Turns out percpu_cpuset_rwsem - commit 1243dc518c ("cgroup/cpuset:
Convert cpuset_mutex to percpu_rwsem") - wasn't such a brilliant idea,
as it has been reported to cause slowdowns in workloads that need to
change cpuset configuration frequently and it is also not implementing
priority inheritance (which causes troubles with realtime workloads).

Convert percpu_cpuset_rwsem back to regular cpuset_mutex. Also grab it
only for SCHED_DEADLINE tasks (other policies don't care about stable
cpusets anyway).

Signed-off-by: Juri Lelli <juri.lelli@redhat.com>
Reviewed-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

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Juri Lelli 2023-05-08 09:58:50 +02:00 • committed by Tejun Heo

parent ad3a557daf

commit 111cd11bbc

3 changed files with 99 additions and 90 deletions

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8

include/linux/cpuset.h

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159

kernel/cgroup/cpuset.c

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22

kernel/sched/core.c

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