linux-kernel - Re: [RFC] Notifier for Externally Mapped Memory (EMM)

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Message-ID: <47CE2B23.6010505@qumranet.com>
Date:	Wed, 05 Mar 2008 07:09:55 +0200
From:	Avi Kivity <avi@...ranet.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Christoph Lameter <clameter@....com>,
	Andrea Arcangeli <andrea@...ranet.com>,
	Jack Steiner <steiner@....com>, Nick Piggin <npiggin@...e.de>,
	akpm@...ux-foundation.org, Robin Holt <holt@....com>,
	kvm-devel@...ts.sourceforge.net, general@...ts.openfabrics.org,
	Steve Wise <swise@...ngridcomputing.com>,
	Roland Dreier <rdreier@...co.com>,
	Kanoj Sarcar <kanojsarcar@...oo.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	daniel.blueman@...drics.com
Subject: Re: [RFC] Notifier for Externally Mapped Memory (EMM)

Peter Zijlstra wrote:
> On Tue, 2008-03-04 at 14:35 -0800, Christoph Lameter wrote:
>
>   
>> RCU means that the callbacks occur in an atomic context.
>>     
>
> Not really, if it requires moving the VM locks to sleepable locks under
> a .config option, I think its also fair to require PREEMPT_RCU.
>
> OTOH, if you want to unconditionally move the VM locks to sleepable
> locks you have a point.
>   

Isn't that out of the question for .25?

I really wish we can get the atomic variant in now, and add on 
sleepability in .26, updating users if necessary.

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

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