Date: Mon, 8 Jun 2009 15:38:57 +0100
From: Mel Gorman <mel@csn.ul.ie>
To: Christoph Lameter <cl@linux-foundation.org>
Cc: Rik van Riel <riel@redhat.com>,
       KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
       yanmin.zhang@intel.com, Wu Fengguang <fengguang.wu@intel.com>,
       linuxram@us.ibm.com, linux-mm <linux-mm@kvack.org>,
       LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/3] Reintroduce zone_reclaim_interval for when
	zone_reclaim() scans and fails to avoid CPU spinning at 100% on NUMA
Message-ID: <20090608143857.GG15070@csn.ul.ie>
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On Mon, Jun 08, 2009 at 10:33:41AM -0400, Christoph Lameter wrote:
> On Mon, 8 Jun 2009, Mel Gorman wrote:
> 
> > Yes, they're on separate LRU lists but they are not the only pages on those
> > lists. The tmpfs pages are mixed in together with anonymous pages so we
> > cannot use NR_*_ANON.
> 
> The tmpfs pages are unreclaimable and therefore should not be on the anon
> lru.
> 

tmpfs pages can be swap-backed so can be reclaimable. Regardless of what
list they are on, we still need to know how many of them there are if
this patch is to be avoided.

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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