Re: [patch 1/2] [PATCH] mm: Save soft-dirty bits on swapped pages

From: Cyrill Gorcunov
Date: Wed Aug 07 2013 - 16:29:21 EST

On Wed, Aug 07, 2013 at 01:21:56PM -0700, Andrew Morton wrote:
> >
> > One of the problem was to find a place in pte entry where we can
> > save the _PTE_SWP_SOFT_DIRTY bit while page is in swap. The
> > _PAGE_PSE was chosen for that, it doesn't intersect with swap
> > entry format stored in pte.
> So the implication is that if another architecture wants to support
> this (and, realistically, wants to support CRIU), that architecture
> must find a spare pte bit to implement _PTE_SWP_SOFT_DIRTY. Yes?

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