linux-kernel - Re: [PATCH 3/4] vmstat: add anon_scan

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Message-ID: <20091229140825.GQ3601@balbir.in.ibm.com>
Date:	Tue, 29 Dec 2009 19:38:25 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH 3/4] vmstat: add anon_scan_ratio field to zoneinfo

* KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> [2009-12-28 16:48:51]:

> Vmscan folks was asked "why does my system makes so much swap-out?"
> in lkml at several times.
> At that time, I made the debug patch to show recent_anon_{scanned/rorated}
> parameter at least three times.
> 
> Thus, its parameter should be showed on /proc/zoneinfo. It help
> vmscan folks debugging.
>

Hmmm.. I think this should come under DEBUG_VM, a lot of tools use
/proc/zoneinfo, the additional overhead may be high.. no? Also,
I would recommend adding the additional details to the end, so
as to not break existing tools (specifically dump line # based
tools).
 
-- 
	Balbir
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