linux-kernel - Re: [PATCH 1/3] Reintroduce zone_reclaim_interval for when zone_reclaim() scans and fails to avoid CPU spinning at 100% on NUMA

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Date:	Mon, 8 Jun 2009 15:38:57 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	yanmin.zhang@...el.com, Wu Fengguang <fengguang.wu@...el.com>,
	linuxram@...ibm.com, linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.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

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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