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Date: Mon, 12 May 2008 15:01:13 -0500
From: Jack Steiner <steiner@sgi.com>
To: Andrea Arcangeli <andrea@qumranet.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Christoph Lameter <clameter@sgi.com>, Robin Holt <holt@sgi.com>,
       Nick Piggin <npiggin@suse.de>, Peter Zijlstra <a.p.zijlstra@chello.nl>,
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       Avi Kivity <avi@qumranet.com>, linux-mm@kvack.org,
       general@lists.openfabrics.org, Hugh Dickins <hugh@veritas.com>,
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       Marcelo Tosatti <marcelo@kvack.org>, Eric Dumazet <dada1@cosmosbay.com>,
       "Paul E. McKenney" <paulmck@us.ibm.com>
Subject: Re: [PATCH 001/001] mmu-notifier-core v17
Message-ID: <20080512200113.GA31862@sgi.com>
References: <20080509193230.GH7710@duo.random>
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On Fri, May 09, 2008 at 09:32:30PM +0200, Andrea Arcangeli wrote:
> From: Andrea Arcangeli <andrea@qumranet.com>
> 
> With KVM/GFP/XPMEM there isn't just the primary CPU MMU pointing to
> pages. There are secondary MMUs (with secondary sptes and secondary
> tlbs) too. sptes in the kvm case are shadow pagetables, but when I say
> spte in mmu-notifier context, I mean "secondary pte". In GRU case
> there's no actual secondary pte and there's only a secondary tlb
> because the GRU secondary MMU has no knowledge about sptes and every
> secondary tlb miss event in the MMU always generates a page fault that
> has to be resolved by the CPU (this is not the case of KVM where the a
> secondary tlb miss will walk sptes in hardware and it will refill the
>...

FYI, I applied to patch to a tree that has the GRU driver. All regression
tests passed.

--- jack