Commit 2af3024c authored Nov 07, 2018 by Paul E. McKenney

cgroups: Replace synchronize_sched() with synchronize_rcu()

Now that synchronize_rcu() waits for preempt-disable regions of code
as well as RCU read-side critical sections, synchronize_sched() can be
replaced by synchronize_rcu().  This commit therefore makes this change,
even though it is but a comment.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: "Dennis Zhou (Facebook)" <dennisszhou@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>

parent d5cccfc7

kernel/cgroup/cgroup.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -5343,7 +5343,7 @@ int __init cgroup_init(void)
		cgroup_rstat_boot();

		/*
		* The latency of the synchronize_sched() is too high for cgroups,
		* The latency of the synchronize_rcu() is too high for cgroups,
		* avoid it at the cost of forcing all readers into the slow path.
		*/
		rcu_sync_enter_start(&cgroup_threadgroup_rwsem.rss);

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