On Sun, 22 Jun 2008, Mel Gorman wrote:
> > Before the change we walk all zones of the zonelist.
> >
>
> Yeah, but the zonelist is for GFP_KERNEL so it should not include the HIGHMEM
> zones, right? The key change is that after the patch there are fewer zonelists
> than get filtered.
But the HIGHMEM zones etc were included before. There was no check for
HIGHMEM etc there. The gfpmask was ignored.
> I think the effect of that patch is that zones get shrunk that have
> nothing to do with the requestors requirements. Right?
Right. AFAICT That was the behavior before the change.