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

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Date:	Wed, 25 Apr 2007 11:19:03 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Pavel Machek <pavel@....cz>
Cc:	Ingo Molnar <mingo@...e.hu>, Mark Lord <lkml@....ca>,
	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

> > it into some xorg.conf field. (It also makes sure that X isnt preempted 
> > by other userspace stuff while it does timing-sensitive operations like 
> > setting the video modes up or switching video modes, etc.)
> 
> X is priviledged. It can just cli around the critical section.

Not really. X can use iopl3 but if it disables interrupts you get
priority inversions and hangs, so in practice it can't do that. 

Alan
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