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cgroups: Replace synchronize_sched() with synchronize_rcu()

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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>
This commit is contained in:
Paul E. McKenney 2018-11-07 14:11:40 -08:00
parent d5cccfc7b7
commit 2af3024cd7
1 changed files with 1 additions and 1 deletions
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kernel/cgroup/cgroup.c
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@ -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);