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

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Date:	Wed, 20 Feb 2013 16:50:33 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Michel Lespinasse <walken@...gle.com>
CC:	Ingo Molnar <mingo@...nel.org>, 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, 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.

-- 
Thanks Alex
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