linux-kernel - Re: 2.6.26-rc: nfsd hangs for a few sec

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Message-ID: <Pine.LNX.4.64.0806212107510.18908@schroedinger.engr.sgi.com>
Date:	Sat, 21 Jun 2008 21:13:00 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Mel Gorman <mel@....ul.ie>
cc:	Alexander Beregalov <a.beregalov@...il.com>,
	kernel-testers@...r.kernel.org,
	kernel list <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
	Lee Schermerhorn <lee.schermerhorn@...com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Hugh Dickins <hugh@...itas.com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	bfields@...ldses.org, neilb@...e.de, linux-nfs@...r.kernel.org
Subject: Re: 2.6.26-rc: nfsd hangs for a few sec

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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