linux-kernel - Re: [PATCH-tip 0/2] locking/rwsem: Rwsem rearchitecture part 2 follow-up patches

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Message-ID: <20190416131047.GW11158@hirez.programming.kicks-ass.net>
Date:   Tue, 16 Apr 2019 15:10:47 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Waiman Long <longman@...hat.com>
Cc:     Ingo Molnar <mingo@...hat.com>, Will Deacon <will.deacon@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        Davidlohr Bueso <dave@...olabs.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        huang ying <huang.ying.caritas@...il.com>
Subject: Re: [PATCH-tip 0/2] locking/rwsem: Rwsem rearchitecture part 2
 follow-up patches

On Mon, Apr 15, 2019 at 04:58:27PM -0400, Waiman Long wrote:
> This series contain 2 follow-up patches to alleviate the performance
> regression found in the page_fault1 test of the will-it-scale benchmark.
> This does not recover all the lost performance, but reclaim a sizeable
> portion of it.
> 
> The regression was found on an Intel system. I have run the test on
> an AMD system. The regression wasn't seen there.  There are only minor
> variations in performance. Perhaps the page fault path is quite different
> between Intel and AMD systems.

Can you please just fold this back into the appropriate patches? Trying
to review all the back and forth is painful.