Date: Thu, 2 Apr 2009 20:27:21 +0100 (BST)
From: Hugh Dickins <hugh@veritas.com>
To: Martin Schwidefsky <schwidefsky@de.ibm.com>
cc: Nick Piggin <nickpiggin@yahoo.com.au>,
       Rusty Russell <rusty@rustcorp.com.au>,
       virtualization@lists.linux-foundation.org, linux-mm@kvack.org,
       linux-kernel@vger.kernel.org, virtualization@lists.osdl.org,
       akpm@osdl.org, frankeh@watson.ibm.com, riel@redhat.com
Subject: Re: [patch 0/6] Guest page hinting version 7.
In-Reply-To: <20090402175249.3c4a6d59@skybase>
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 <20090329162336.7c0700e9@skybase> <200904022232.02185.nickpiggin@yahoo.com.au>
 <20090402175249.3c4a6d59@skybase>
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On Thu, 2 Apr 2009, Martin Schwidefsky wrote:
> On Thu, 2 Apr 2009 22:32:00 +1100
> Nick Piggin <nickpiggin@yahoo.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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