linux-kernel - Re: [kvm-devel] [PATCH] export notifier #1

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Message-ID: <4799834C.8050608@qumranet.com>
Date:	Fri, 25 Jan 2008 08:35:56 +0200
From:	Avi Kivity <avi@...ranet.com>
To:	Christoph Lameter <clameter@....com>
CC:	Andrea Arcangeli <andrea@...ranet.com>, Robin Holt <holt@....com>,
	Izik Eidus <izike@...ranet.com>, Andrew Morton <akpm@...l.org>,
	Nick Piggin <npiggin@...e.de>, kvm-devel@...ts.sourceforge.net,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	steiner@....com, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	daniel.blueman@...drics.com, Hugh Dickins <hugh@...itas.com>
Subject: Re: [kvm-devel] [PATCH] export notifier #1

Christoph Lameter wrote:
> On Thu, 24 Jan 2008, Andrea Arcangeli wrote:
>
>   
>> I think you should consider if you can also build a rmap per-MM like
>> KVM does and index it by the virtual address like KVM does.
>>     
>
> Yes we have that.
>
> If we have that then we do not need the mmu_notifier. 
> We could call it with a page parameter and then walk the KVM or XPmem 
> reverse map to directly find all the ptes we need to clear. There is no 
> need then to add a new field to the mm_struct.
>   

The reason the new field is needed is because the Linux mm does not 
understand the secondary pte format and zapping protocol.  Locating the 
secondary ptes is just a part of the problem.


-- 
Any sufficiently difficult bug is indistinguishable from a feature.

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