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

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Message-ID: <20080201041512.GF26420@sgi.com>
Date:	Thu, 31 Jan 2008 22:15:13 -0600
From:	Robin Holt <holt@....com>
To:	Christoph Lameter <clameter@....com>
Cc:	Robin Holt <holt@....com>, Andrea Arcangeli <andrea@...ranet.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:
> On Thu, 31 Jan 2008, Robin Holt wrote:
> 
> > > +	void (*invalidate_range_end)(struct mmu_notifier *mn,
> > > +				 struct mm_struct *mm, int atomic);
> > 
> > I think we need to pass in the same start-end here as well.  Without it,
> > the first invalidate_range would have to block faulting for all addresses
> > and would need to remain blocked until the last invalidate_range has
> > completed.  While this would work, (and will probably be how we implement
> > it for the short term), it is far from ideal.
> 
> Ok. Andrea wanted the same because then he can void the begin callouts.
> 
> The problem is that you would have to track the start-end addres right?

Yep.  We will probably no do that in the next week, but I would expect
we have that working before we submit xpmem again.  We will probably
just chain them up in a regular linked list.

Thanks,
Robin
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