Date: Sat, 21 Jun 2008 21:13:00 -0700 (PDT)
From: Christoph Lameter <clameter@sgi.com>
To: Mel Gorman <mel@csn.ul.ie>
cc: Alexander Beregalov <a.beregalov@gmail.com>,
       kernel-testers@vger.kernel.org,
       kernel list <linux-kernel@vger.kernel.org>, linux-mm@kvack.org,
       Lee Schermerhorn <lee.schermerhorn@hp.com>,
       KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
       Hugh Dickins <hugh@veritas.com>, Nick Piggin <nickpiggin@yahoo.com.au>,
       Andrew Morton <akpm@linux-foundation.org>,
       Linus Torvalds <torvalds@linux-foundation.org>, bfields@fieldses.org,
       neilb@suse.de, linux-nfs@vger.kernel.org
Subject: Re: 2.6.26-rc: nfsd hangs for a few sec
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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.
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