linux-kernel - Re: [PATCH 7/8] kstaled: add histogram sampling functionality

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Message-Id: <20110922161539.d947e014.akpm@google.com>
Date:	Thu, 22 Sep 2011 16:15:39 -0700
From:	Andrew Morton <akpm@...gle.com>
To:	Michel Lespinasse <walken@...gle.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <jweiner@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Hugh Dickins <hughd@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Michael Wolf <mjwolf@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 7/8] kstaled: add histogram sampling functionality

On Fri, 16 Sep 2011 20:39:12 -0700
Michel Lespinasse <walken@...gle.com> wrote:

> add statistics for pages that have been idle for 1,2,5,15,30,60,120 or
> 240 scan intervals into /dev/cgroup/*/memory.idle_page_stats

Why?  What's the use case for this feature?
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