linux-kernel - Re: [PATCH 0/4] rwsem: Implement writer lock-stealing

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Message-ID: <20130220104043.GB7691@gmail.com>
Date:	Wed, 20 Feb 2013 11:40:43 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Alex Shi <alex.shi@...el.com>
Cc:	Michel Lespinasse <walken@...gle.com>,
	linux-kernel@...r.kernel.org, anton@...ba.org, hpa@...or.com,
	arjan@...ux.intel.com, a.p.zijlstra@...llo.nl,
	torvalds@...ux-foundation.org, yuanhan.liu@...ux.intel.com,
	dhowells@...hat.com, akpm@...ux-foundation.org, tglx@...utronix.de
Subject: Re: [PATCH 0/4] rwsem: Implement writer lock-stealing


* Alex Shi <alex.shi@...el.com> wrote:

> > Alex, could you go through my patch and see if there is 
> > anything you find objectionable ? (if not about the details, 
> > at least about the general approach of enabling writer lock 
> > stealing on the fast path)
> 
> I did a quick review on the patchset and tested the patches 
> 1~3, and 1~3 plus 4th, my patch plus 4th.
> 
> The patch looks much complicated, and also goes writing slow 
> path to steal locking. My patch looks quite straight and 
> simple.
> 
> This 1~3 patch has very very similar performance effect with 
> mine.
> 
> The highlight patch is the 4th, seems it can provide about ~2% 
> aim7 performance gain(base on both of mine or patches 1~3) on 
> my 4S NHM EX machine.

That speedup would be nice to have.

Thanks,

	Ingo
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