Re: [PATCH] mm: Track vma changes with VM_SOFTDIRTY bit

[Andrew Morton]

On Mon, 19 Aug 2013 23:58:36 +0400 Cyrill Gorcunov <gorcunov@xxxxxxxxx> 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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