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

On Fri, 16 Sep 2011 20:39:12 -0700
Michel Lespinasse <walken@google.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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