linux-kernel - Re: [PATCH 0/4] per anon_vma lock and turn anon_vma rwsem lock to rwlock

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Date:	Fri, 01 Nov 2013 20:15:13 -0700
From:	Davidlohr Bueso <davidlohr@...com>
To:	Yuanhan Liu <yuanhan.liu@...ux.intel.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Michel Lespinasse <walken@...gle.com>
Subject: Re: [PATCH 0/4] per anon_vma lock and turn anon_vma rwsem lock to
 rwlock_t

On Fri, 2013-11-01 at 18:16 +0800, Yuanhan Liu wrote:
> On Fri, Nov 01, 2013 at 09:21:46AM +0100, Ingo Molnar wrote:
> > 
> > * Yuanhan Liu <yuanhan.liu@...ux.intel.com> wrote:
> > 
> > > > Btw., another _really_ interesting comparison would be against 
> > > > the latest rwsem patches. Mind doing such a comparison?
> > > 
> > > Sure. Where can I get it? Are they on some git tree?
> > 
> > I've Cc:-ed Tim Chen who might be able to point you to the latest 
> > version.
> > 
> > The last on-lkml submission was in this thread:
> > 
> >   Subject: [PATCH v8 0/9] rwsem performance optimizations
> > 
> 
> Thanks.
> 
> I queued bunchs of tests about one hour ago, and already got some
> results(If necessary, I can add more data tomorrow when those tests are
> finished):

What kind of system are you using to run these workloads on?

> 
> 
>                v3.12-rc7      fe001e3de090e179f95d  
> ------------------------  ------------------------  
>                                 -9.3%               brickland1/micro/aim7/shared
>                                 +4.3%               lkp-ib03/micro/aim7/fork_test
>                                 +2.2%               lkp-ib03/micro/aim7/shared
>                                 -2.6%               TOTAL aim7.2000.jobs-per-min
> 

Sorry if I'm missing something, but could you elaborate more on what
these percentages represent? Are they anon vma rwsem + optimistic
spinning patches vs anon vma rwlock?

Also, I see your running aim7, you might be interested in some of the
results I found when trying out Ingo's rwlock conversion patch on a
largish 80 core system: https://lkml.org/lkml/2013/9/29/280

Thanks,
Davidlohr

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