Messages in this thread |  | | Date | Thu, 14 Jul 2016 18:14:13 +0200 | From | Peter Zijlstra <> | Subject | Re: Severe performance regression w/ 4.4+ on Android due to cgroup locking changes |
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On Thu, Jul 14, 2016 at 04:58:44PM +0200, Oleg Nesterov wrote: > > Of course, this leads to another question: do we really need rcu-sync at > all, or should we change percpu-rwsem to always work in the "slow" mode > which is not that slow with your change... I'd like to keep it ;) > > What do you think?
Yes, I think we wants to keep it. There are users where the read size cost really are performance critical. I still have to repost that lglock removal series for example, which replaces the fs/locks lglock with a percpu-rwsem.
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