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.
