Messages in this thread | | | Date | Mon, 19 Aug 2013 14:08:16 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH] mm: Track vma changes with VM_SOFTDIRTY bit |
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On Mon, 19 Aug 2013 23:58:36 +0400 Cyrill Gorcunov <gorcunov@gmail.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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