linux-kernel - Re: [PATCH] mmu notifiers #v5

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Message-ID: <Pine.LNX.4.64.0801311508080.23624@schroedinger.engr.sgi.com>
Date:	Thu, 31 Jan 2008 15:09:55 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Andrea Arcangeli <andrea@...ranet.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] mmu notifiers #v5

On Thu, 31 Jan 2008, Christoph Lameter wrote:

> > pagefault against the main linux page fault, given we already have all
> > needed serialization out of the PT lock. XPMEM is forced to do that
> 
> pt lock cannot serialize with invalidate_range since it is split. A range 
> requires locking for a series of ptes not only individual ones.

Hmmm.. May be okay after all. I see that you are only doing it on the pte 
level. This means the range callbacks are taking down a max of 512 
entries. So you have a callback for each pmd. A callback for 2M of memory?




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