linux-kernel - Re: [PATCH 04 of 12] Moves all mmu notifier methods outside the PT lock (first and not last

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Message-ID: <480FA4A9.4090403@qumranet.com>
Date:	Thu, 24 Apr 2008 00:05:45 +0300
From:	Avi Kivity <avi@...ranet.com>
To:	Robin Holt <holt@....com>
CC:	Andrea Arcangeli <andrea@...ranet.com>,
	Christoph Lameter <clameter@....com>,
	Nick Piggin <npiggin@...e.de>, Jack Steiner <steiner@....com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	kvm-devel@...ts.sourceforge.net,
	Kanoj Sarcar <kanojsarcar@...oo.com>,
	Roland Dreier <rdreier@...co.com>,
	Steve Wise <swise@...ngridcomputing.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	general@...ts.openfabrics.org, Hugh Dickins <hugh@...itas.com>,
	akpm@...ux-foundation.org, Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH 04 of 12] Moves all mmu notifier methods outside the PT
 lock (first and not last

Robin Holt wrote:
>> an hurry like we are, we can't progress without this. Infact we can
>>     
>
> SGI is under an equally strict timeline.  We really needed the sleeping
> version into 2.6.26.  We may still be able to get this accepted by
> vendor distros if we make 2.6.27.
>   

The difference is that the non-sleeping variant can be shown not to 
affect stability or performance, even if configed in, as long as its not 
used.  The sleeping variant will raise performance and stability concerns.

I have zero objections to sleeping mmu notifiers; I only object to tying 
the schedules of the two together.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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