Re: [RFC 13/16] mm/cma: populate ZONE_CMA and use this zone when GFP_HIGHUSERMOVABLE

From: Joonsoo Kim
Date: Tue Feb 17 2015 - 00:22:40 EST

On Sat, Feb 14, 2015 at 02:02:16PM +0900, Gioh Kim wrote:
> 2015-02-12 ìí 4:32ì Joonsoo Kim ì(ê) ì ê:
> > Until now, reserved pages for CMA are managed altogether with normal
> > page in the same zone. This approach has numorous problems and fixing
> > them isn't easy. To fix this situation, ZONE_CMA is introduced in
> > previous patch, but, not yet populated. This patch implement population
> > of ZONE_CMA by stealing reserved pages from normal zones. This stealing
> > break one uncertain assumption on zone, that is, zone isn't overlapped.
> > In the early of this series, some check is inserted to every zone's span
> > iterator to handle zone overlap so there would be no problem with
> > this assumption break.
> >
> > To utilize this zone, user should use GFP_HIGHUSERMOVABLE, because
> I think it might be typo of GFP_HIGHUSER_MOVABLE.

Yes, I will correct next time.

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