linux-kernel - Re: [PATCH 001/001] mmu-notifier-core v17

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Message-ID: <20080512200113.GA31862@sgi.com>
Date:	Mon, 12 May 2008 15:01:13 -0500
From:	Jack Steiner <steiner@....com>
To:	Andrea Arcangeli <andrea@...ranet.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Christoph Lameter <clameter@....com>,
	Robin Holt <holt@....com>, Nick Piggin <npiggin@...e.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	kvm-devel@...ts.sourceforge.net,
	Kanoj Sarcar <kanojsarcar@...oo.com>,
	Roland Dreier <rdreier@...co.com>,
	Steve Wise <swise@...ngridcomputing.com>,
	linux-kernel@...r.kernel.org, Avi Kivity <avi@...ranet.com>,
	linux-mm@...ck.org, general@...ts.openfabrics.org,
	Hugh Dickins <hugh@...itas.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Anthony Liguori <aliguori@...ibm.com>,
	Chris Wright <chrisw@...hat.com>,
	Marcelo Tosatti <marcelo@...ck.org>,
	Eric Dumazet <dada1@...mosbay.com>,
	"Paul E. McKenney" <paulmck@...ibm.com>
Subject: Re: [PATCH 001/001] mmu-notifier-core v17

On Fri, May 09, 2008 at 09:32:30PM +0200, Andrea Arcangeli wrote:
> From: Andrea Arcangeli <andrea@...ranet.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
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