linux-kernel - Re: [PATCH 4/5] add isolate pages vmstat

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Date:	Thu, 9 Jul 2009 16:43:02 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
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>,
	Wu Fengguang <fengguang.wu@...el.com>,
	David Rientjes <rientjes@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>
Subject: Re: [PATCH 4/5] add isolate pages vmstat

On Thu, 9 Jul 2009, KOSAKI Motohiro wrote:

> Subject: [PATCH] add isolate pages vmstat
>
> If the system have plenty threads or processes, concurrent reclaim can
> isolate very much pages.
> Unfortunately, current /proc/meminfo and OOM log can't show it.

"
If the system is running a heavy load of processes then concurrent reclaim
can isolate a large numbe of pages from the LRU. /proc/meminfo and the
output generated for an OOM do not show how many pages were isolated.
"

> This patch provide the way of showing this information.

"
This patch shows the information about isolated pages.
"

Page migration can also isolate a large number of pages from the LRU. But
the new counters are not used there.

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