linux-kernel - Re: [Bug 67651] Bisected: Lots of fragmented mmaps cause gimp to fail in 3.12 after exceeding vm_max_map

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Message-ID: <20140123055906.GS1574@moon>
Date:	Thu, 23 Jan 2014 09:59:06 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Mel Gorman <mgorman@...e.de>,
	Pavel Emelyanov <xemul@...allels.com>,
	Andrew Morton <akpm@...ux-foundation.org>, gnome@...t.net,
	drawoc@...krefraction.com, alan@...rguk.ukuu.org.uk,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	bugzilla-daemon@...zilla.kernel.org
Subject: Re: [Bug 67651] Bisected: Lots of fragmented mmaps cause gimp to
 fail in 3.12 after exceeding vm_max_map_count

On Wed, Jan 22, 2014 at 02:45:53PM -0800, Andy Lutomirski wrote:
> >     
> >     Thus when user space application track memory changes now it can detect if
> >     vma area is renewed.
> 
> Presumably some path is failing to set VM_SOFTDIRTY, thus preventing mms
> from being merged.
> 
> That being said, this could cause vma blowups for programs that are
> actually using this thing.

Hi Andy, indeed, this could happen. The easiest way is to ignore softdirty bit
when we're trying to merge vmas and set it one new merged. I think this should
be correct. Once I finish I'll send the patch.

	Cyrill
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