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

[Cyrill Gorcunov]

On Wed, Jul 24, 2013 at 11:04:53PM +0400, Cyrill Gorcunov wrote:
> 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)

(i meant page flags wont help)
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/