Messages in this thread | | | Date | Wed, 24 Jul 2013 23:04:53 +0400 | From | Cyrill Gorcunov <> | Subject | Re: [PATCH] mm: Save soft-dirty bits on swapped pages |
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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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