Re: [PATCH] mm: Save soft-dirty bits on swapped pages

[Cyrill Gorcunov]

On Wed, Jul 24, 2013 at 10:55:41PM +0400, Pavel Emelyanov wrote:
> > 
> > Well, some part of information already lays in pte (such as 'file' bit,
> > swap entries) so it looks natural i think to work on this level. but
> > letme think if use page struct for that be more convenient...
> 
> It hardly will be. Consider we have a page shared between two tasks,
> then first one "touches" it and soft-dirty is put onto his PTE and,
> subsequently, the page itself. The we go and clear sofr-dirty for the
> 2nd task. What should we do with the soft-dirty bit on the page?

Indeed, this won't help. Well then, bippidy-boppidy-boo, our
pants are metaphorically on fire (c)

> 
> The soft-dirty thing watches changes in the virtual memory, not in
> the physical one.
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