linux-kernel - Re: [Bugme-new] [Bug 15618] New: 2.6.18->2.6.32->2.6.33 huge regression in performance

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Date:	Tue, 23 Mar 2010 16:04:35 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Anton Starikov <ant.starikov@...il.com>, Greg KH <greg@...ah.com>,
	stable@...nel.org
cc:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [Bugme-new] [Bug 15618] New: 2.6.18->2.6.32->2.6.33 huge regression
 in performance



On Tue, 23 Mar 2010, Anton Starikov wrote:
>
> I think we got a winner!
> 
> Problem seems to be fixed.
> 
> Just for record, I used next patches:
> 
> 59c33fa7791e9948ba467c2b83e307a0d087ab49
> 5d0b7235d83eefdafda300656e97d368afcafc9a
> 1838ef1d782f7527e6defe87e180598622d2d071
> 4126faf0ab7417fbc6eb99fb0fd407e01e9e9dfe
> bafaecd11df15ad5b1e598adc7736afcd38ee13d
> 0d1622d7f526311d87d7da2ee7dd14b73e45d3fc

Ok. If you have performance numbers for before/after these patches for 
your actual workload, I'd suggest posting them to stable@...nel.org, and 
maybe those rwsem fixes will get back-ported.

The patches are pretty small, and should be fairly safe. So they are 
certainly stable material.

		Linus
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