linux-kernel - Re: [PATCH 3/5] Show kernel stack usage to /proc/meminfo and OOM log

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Date:	Tue, 7 Jul 2009 12:37:34 -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>
Subject: Re: [PATCH 3/5] Show kernel stack usage to /proc/meminfo and OOM
 log

On Sun, 5 Jul 2009, KOSAKI Motohiro wrote:

> Subject: [PATCH] Show kernel stack usage to /proc/meminfo and OOM log
>
> if the system have a lot of thread, kernel stack consume unignorable large size
> memory. IOW, it make a lot of unaccountable memory.
> Tons unaccountable memory bring to harder analyse memory related trouble.
>
> Then, kernel stack account is useful.

The amount of memory allocated to kernel stacks can become significant and
cause OOM conditions. However, we do not display the amount of memory
consumed by stacks.'

Add code to display the amount of memory used for stacks in /proc/meminfo.

Reviewed-by: <cl@...ux-foundation.org>

(It may be useful to also include the stack sizes in the per zone
information displayed when an OOM occurs).
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