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Juri Lelli 9bcfe15278 sched/cpuset: Bring back cpuset_mutex

commit 111cd11bbc upstream.

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>
[ Conflict in kernel/cgroup/cpuset.c due to pulling new code/comments.
  Reject all new code. Remove BUG_ON() about rwsem that doesn't exist on
  mainline. ]
Signed-off-by: Qais Yousef (Google) <qyousef@layalina.io>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2023-08-30 16:11:10 +02:00

cgroup-internal.h

memcg: Fix possible use-after-free in memcg_write_event_control()

2022-12-08 10:40:58 -08:00

cgroup-v1.c

cgroup: fix missing cpus_read_{lock,unlock}() in cgroup_transfer_tasks()

2023-06-21 16:00:51 +02:00

cgroup.c

sched/psi: use kernfs polling functions for PSI trigger polling

2023-07-27 08:50:38 +02:00

cpuset.c

sched/cpuset: Bring back cpuset_mutex