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Date: Thu, 6 Jul 2017 09:20:24 -0700 From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> To: Peter Zijlstra <peterz@...radead.org> Cc: David Laight <David.Laight@...LAB.COM>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "netfilter-devel@...r.kernel.org" <netfilter-devel@...r.kernel.org>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "oleg@...hat.com" <oleg@...hat.com>, "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>, "mingo@...hat.com" <mingo@...hat.com>, "dave@...olabs.net" <dave@...olabs.net>, "manfred@...orfullife.com" <manfred@...orfullife.com>, "tj@...nel.org" <tj@...nel.org>, "arnd@...db.de" <arnd@...db.de>, "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>, "will.deacon@....com" <will.deacon@....com>, "stern@...land.harvard.edu" <stern@...land.harvard.edu>, "parri.andrea@...il.com" <parri.andrea@...il.com>, "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org> Subject: Re: [PATCH v2 0/9] Remove spin_unlock_wait() On Thu, Jul 06, 2017 at 06:05:55PM +0200, Peter Zijlstra wrote: > On Thu, Jul 06, 2017 at 02:12:24PM +0000, David Laight wrote: > > From: Paul E. McKenney [ . . . ] > Now on the one hand I feel like Oleg that it would be a shame to loose > the optimization, OTOH this thing is really really tricky to use, > and has lead to a number of bugs already. I do agree, it is a bit sad to see these optimizations go. So, should this make mainline, I will be tagging the commits that spin_unlock_wait() so that they can be easily reverted should someone come up with good semantics and a compelling use case with compelling performance benefits. Thanx, Paul
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