linux-kernel - Re: [PATCH] mm: Track vma changes with VM

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Message-Id: <20130819140816.6c35952c0bc19c480a9664d6@linux-foundation.org>
Date:	Mon, 19 Aug 2013 14:08:16 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andy Lutomirski <luto@...capital.net>,
	Pavel Emelyanov <xemul@...allels.com>,
	Matt Mackall <mpm@...enic.com>,
	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Peter Zijlstra <peterz@...radead.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: [PATCH] mm: Track vma changes with VM_SOFTDIRTY bit

On Mon, 19 Aug 2013 23:58:36 +0400 Cyrill Gorcunov <gorcunov@...il.com> wrote:

> Pavel reported that in case if vma area get unmapped and
> then mapped (or expanded) in-place, the soft dirty tracker
> won't be able to recognize this situation since it works on
> pte level and ptes are get zapped on unmap, loosing soft
> dirty bit of course.
> 
> So to resolve this situation we need to track actions
> on vma level, there VM_SOFTDIRTY flag comes in. When
> new vma area created (or old expanded) we set this bit,
> and keep it here until application calls for clearing
> soft dirty bit.
> 
> Thus when user space application track memory changes
> now it can detect if vma area is renewed.

Can we please update Documentation/vm/soft-dirty.txt for this?
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