linux-kernel - Re: Over-eager swapping

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Message-ID: <20100803033108.GA23117@arachsys.com>
Date:	Tue, 3 Aug 2010 04:31:10 +0100
From:	Chris Webb <chris@...chsys.com>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Wu Fengguang <fengguang.wu@...el.com>
Subject: Re: Over-eager swapping

Minchan Kim <minchan.kim@...il.com> writes:

> Another possibility is _zone_reclaim_ in NUMA.
> Your working set has many anonymous page.
> 
> The zone_reclaim set priority to ZONE_RECLAIM_PRIORITY.
> It can make reclaim mode to lumpy so it can page out anon pages.
> 
> Could you show me /proc/sys/vm/[zone_reclaim_mode/min_unmapped_ratio] ?

Sure, no problem. On the machine with the /proc/meminfo I showed earlier,
these are

  # cat /proc/sys/vm/zone_reclaim_mode 
  0
  # cat /proc/sys/vm/min_unmapped_ratio 
  1

I haven't changed either of these from the kernel default.

Many thanks,

Chris.
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