linux-kernel - Re: [PATCH] mm: Ignore VM_SOFTDIRTY on VMA merging, v2

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Date:	Fri, 24 Jan 2014 10:14:16 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	Pavel Emelyanov <xemul@...allels.com>,
	Andrew Morton <akpm@...ux-foundation.org>, gnome@...t.net,
	grawoc@...krefraction.com, alan@...rguk.ukuu.org.uk,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	bugzilla-daemon@...zilla.kernel.org
Subject: Re: [PATCH] mm: Ignore VM_SOFTDIRTY on VMA merging, v2

On Thu, Jan 23, 2014 at 07:14:45PM +0400, Cyrill Gorcunov wrote:
> On Thu, Jan 23, 2014 at 04:55:43PM +0400, Cyrill Gorcunov wrote:
> > On Thu, Jan 23, 2014 at 04:15:55PM +0400, Cyrill Gorcunov wrote:
> > > > 
> > > > Thanks a lot, Mel! I'm testing the patch as well (manually though :).
> > > > I'll send the final fix today.
> > > 
> > > The patch below should fix the problem. I would really appreaciate
> > > some additional testing.
> > 
> > Forgot to refresh the patch, sorry.
> > ---
> 
> I think setting up dirty bit inside vma_merge() body is a big hammer
> which should not be used, but it's up to caller of vma_merge() to figure
> out if dirty bit should be set or not if merge successed. Thus softdirty
> vma bit should be (and it already is) set at the end of mmap_region and do_brk
> routines. So patch could be simplified (below). Pavel, what do you think?
> ---
> From: Cyrill Gorcunov <gorcunov@...il.com>
> Subject: [PATCH] mm: Ignore VM_SOFTDIRTY on VMA merging, v2
> 

It passed the gimp launching test. Patch looks sane but I confess I did
not put a whole lot of thought into it because I see that Andrew is
already reviewing it so

Tested-by: Mel Gorman <mgorman@...e.de>

If this is merged then remember that it should be tagged for 3.12-stable
as 3.12.7 and 3.12.8 are affected by this bug.

-- 
Mel Gorman
SUSE Labs
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