linux-kernel - Re: Misleading OOM messages

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Date:	Fri, 15 May 2009 13:59:50 -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:

> Ok, so kernel should be fixed to make limits 30% of non-mlocked
> memory.

There is already ulimit.

> > folks.  They go sucking up and locking as much memory as they can get
> > their hands on.  Adding memory never helps them because they'll use up
> > whatever is there.
>
> Well, but it is uncommon everywhere else. If you have desktop system,
> job size is pretty much constant. If you have too little memory, you
> OOM.

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.


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