linux-kernel - Re: [PATCH 02/10] mm: vmscan: Obey proportional scanning requirements for kswapd

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Date:	Sun, 17 Mar 2013 15:08:07 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Linux-MM <linux-mm@...ck.org>, Jiri Slaby <jslaby@...e.cz>,
	Valdis Kletnieks <Valdis.Kletnieks@...edu>,
	Rik van Riel <riel@...hat.com>,
	Zlatko Calusic <zcalusic@...sync.net>,
	Johannes Weiner <hannes@...xchg.org>,
	dormando <dormando@...ia.net>,
	Satoru Moriya <satoru.moriya@....com>,
	Michal Hocko <mhocko@...e.cz>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 02/10] mm: vmscan: Obey proportional scanning
 requirements for kswapd

On Sun, Mar 17, 2013 at 07:39:37AM -0700, Andi Kleen wrote:
> Mel Gorman <mgorman@...e.de> writes:
> > +
> > +	/*
> > +	 * For direct reclaim, reclaim the number of pages requested. Less
> > +	 * care is taken to ensure that scanning for each LRU is properly
> > +	 * proportional. This is unfortunate and is improper aging but
> > +	 * minimises the amount of time a process is stalled.
> > +	 */
> > +	if (!current_is_kswapd()) {
> > +		if (nr_reclaimed >= nr_to_reclaim) {
> > +			for_each_evictable_lru(l)
> 
> Don't we need some NUMA awareness here?
> Similar below.
> 

Of what sort? In this context we are usually dealing with a zone and in
the case of kswapd it is only ever dealing with a single node.

-- 
Mel Gorman
SUSE Labs
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