linux-kernel - Re: [REPORT] cfs-v4 vs sd-0.44

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Date:	Sun, 22 Apr 2007 09:18:25 -0400
From:	Mark Lord <lkml@....ca>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	Con Kolivas <kernel@...ivas.org>, Willy Tarreau <w@....eu>,
	William Lee Irwin III <wli@...omorphy.com>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>, Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Peter Williams <pwil3058@...pond.net.au>,
	Thomas Gleixner <tglx@...utronix.de>, caglar@...dus.org.tr,
	Gene Heskett <gene.heskett@...il.com>
Subject: Re: [REPORT] cfs-v4 vs sd-0.44

Ingo Molnar wrote:
> * Jan Engelhardt <jengelh@...ux01.gwdg.de> wrote:
> 
>>> i've attached it below in a standalone form, feel free to put it 
>>> into SD! :)
>> Assume X went crazy (lacking any statistics, I make the unproven 
>> statement that this happens more often than kthreads going berserk), 
>> then having it niced with minus something is not too nice.
> 
> i've not experienced a 'runaway X' personally, at most it would crash or 
> lock up ;) The value is boot-time and sysctl configurable as well back 
> to 0.
>

Mmmm.. I've had to kill off the odd X that was locking in 100% CPU usage.
In the past, this has happened maybe 1-3 times a year or so on my notebook.

Now mind you, that usage could have been due to some client process,
but X is where the 100% showed up, so X is what I nuked.

Cheers
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