linux-kernel - Re: Misleading OOM messages

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Date:	Fri, 15 May 2009 17:15:54 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Pavel Machek <pavel@....cz>
cc:	Dave Hansen <dave@...ux.vnet.ibm.com>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Nick Piggin <npiggin@...e.de>, Mel Gorman <mel@....ul.ie>,
	Peter Ziljstra <a.p.ziljstra@...llo.nl>,
	San Mehat <san@...roid.com>, Arve Hj?nnev?g <arve@...roid.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Misleading OOM messages

On Fri, 15 May 2009, Pavel Machek wrote:

> > Nope. If you have too little memory for your app then the kernel pages
> > portions of the app out to disk. Thats is why you have a VM (VIRTUAL
> > machine). The app is not running with physical memory.
>
> Try running your machine with mem=8M, then tell me how virtual memory
> works.

Well that is of course not enough memory. And you intentionally screwed up
your setup.

> If you have *way* too little RAM, you OOM. (Kernel data is
> unswappable. Task struct is 8KB. At some point it breaks).

I do not see anyone doubting that this is the case.

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