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SubjectRe: [PATCH 3/3] mm,vmscan: Reclaim order-0 and compact instead of lumpy reclaim when under light pressure
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> On Thu, Nov 11, 2010 at 07:07:04PM +0000, Mel Gorman wrote:
> > + if (COMPACTION_BUILD)
> > + sc->lumpy_reclaim_mode = LUMPY_MODE_COMPACTION;
> > + else
> > + sc->lumpy_reclaim_mode = LUMPY_MODE_CONTIGRECLAIM;
> >
>
> Gack, I posted the slightly wrong version. This version prevents lumpy
> reclaim ever being used. The figures I posted were for a patch where
> this condition looked like
>
> if (COMPACTION_BUILD && priority > DEF_PRIORITY - 2)
> sc->lumpy_reclaim_mode = LUMPY_MODE_COMPACTION;
> else
> sc->lumpy_reclaim_mode = LUMPY_MODE_CONTIGRECLAIM;

Can you please tell us your opinition which is better 1) automatically turn lumby on
by priority (this approach) 2) introduce GFP_LUMPY (andrea proposed). I'm not
sure which is better, then I'd like to hear both pros/cons concern.

Thanks.




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