linux-kernel - Re: [patch 1/3] mmu

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Message-ID: <20080203013323.GA7185@v2.random>
Date:	Sun, 3 Feb 2008 02:33:23 +0100
From:	Andrea Arcangeli <andrea@...ranet.com>
To:	Christoph Lameter <clameter@....com>
Cc:	Robin Holt <holt@....com>, Avi Kivity <avi@...ranet.com>,
	Izik Eidus <izike@...ranet.com>,
	kvm-devel@...ts.sourceforge.net,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, steiner@....com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	daniel.blueman@...drics.com
Subject: Re: [patch 1/3] mmu_notifier: Core code

On Thu, Jan 31, 2008 at 07:58:40PM -0800, Christoph Lameter wrote:
> Ok. Andrea wanted the same because then he can void the begin callouts.

Exactly. I hope the page-pin will avoid me having to serialize the KVM
page fault against the start/end critical section.

BTW, I wonder if the start/end critical section API is intended to
forbid scheduling inside it. In short I wonder if GRU can is allowed
to take a spinlock in _range_start as last thing before returning, and
to release that same spinlock in _range_end as first thing, and not to
be forced to use a mutex.
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