linux-kernel - Re: [PATCH 2/3] mm: page allocator: Calculate a better estimate of NR_FREE_PAGES when memory is low and kswapd is awake

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Message-ID: <alpine.DEB.2.00.1009031950100.18051@router.home>
Date:	Fri, 3 Sep 2010 19:54:01 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Mel Gorman <mel@....ul.ie>,
	Linux Kernel List <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org, Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Minchan Kim <minchan.kim@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [PATCH 2/3] mm: page allocator: Calculate a better estimate of
 NR_FREE_PAGES when memory is low and kswapd is awake

On Fri, 3 Sep 2010, Andrew Morton wrote:

> > percpu counters must always be added up when their value is determined.
>
> Nope.  That's the difference between percpu_counter_read() and
> percpu_counter_sum().

Hmmm... Okay you can fold them therefore. That is analogous to what we do
in the _snapshot function now.
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