linux-kernel - Re: [patch 0/6] Guest page hinting version 7.

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Message-ID: <Pine.LNX.4.64.0904022016180.29625@blonde.anvils>
Date:	Thu, 2 Apr 2009 20:27:21 +0100 (BST)
From:	Hugh Dickins <hugh@...itas.com>
To:	Martin Schwidefsky <schwidefsky@...ibm.com>
cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	Rusty Russell <rusty@...tcorp.com.au>,
	virtualization@...ts.linux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, virtualization@...ts.osdl.org,
	akpm@...l.org, frankeh@...son.ibm.com, riel@...hat.com
Subject: Re: [patch 0/6] Guest page hinting version 7.

On Thu, 2 Apr 2009, Martin Schwidefsky wrote:
> On Thu, 2 Apr 2009 22:32:00 +1100
> Nick Piggin <nickpiggin@...oo.com.au> wrote:
> 
> > I still think this needs much more justification.
>  
> Ok, I can understand that. We probably need a KVM based version to show
> that benefits exist on non-s390 hardware as well.

That would indeed help your cause enormously (I think I made the same
point last time).  All these complex transitions, added to benefit only
an architecture to which few developers have access, asks for trouble -
we mm hackers already get caught out often enough by your
too-well-camouflaged page_test_dirty().

Hugh
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