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Date: Wed, 25 Apr 2007 10:22:47 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Pavel Machek <pavel@ucw.cz>
Cc: Mark Lord <lkml@rtr.ca>, Jan Engelhardt <jengelh@linux01.gwdg.de>,
       Con Kolivas <kernel@kolivas.org>, Willy Tarreau <w@1wt.eu>,
       William Lee Irwin III <wli@holomorphy.com>,
       linux-kernel@vger.kernel.org,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Nick Piggin <npiggin@suse.de>, Mike Galbraith <efault@gmx.de>,
       Arjan van de Ven <arjan@infradead.org>,
       Peter Williams <pwil3058@bigpond.net.au>,
       Thomas Gleixner <tglx@linutronix.de>, caglar@pardus.org.tr,
       Gene Heskett <gene.heskett@gmail.com>
Subject: Re: [REPORT] cfs-v4 vs sd-0.44
Message-ID: <20070425082247.GA21546@elte.hu>
References: <20070420140457.GA14017@elte.hu> <20070421121235.GA2044@1wt.eu> <200704220155.20856.kernel@kolivas.org> <20070421160008.GA28783@elte.hu> <Pine.LNX.4.61.0704211913130.9989@yvahk01.tjqt.qr> <20070421190026.GA25720@elte.hu> <462B60A1.1020407@rtr.ca> <20070422132732.GB18471@elte.hu> <20070425081602.GA7255@ucw.cz>
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* Pavel Machek <pavel@ucw.cz> wrote:

> > 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.

yes, that is a tool that can be used too (and is used by most drivers) - 
my point was rather that besides the disadvantages, not preempting X can 
be an advantage too - not that there are no other (and often more 
suitable) tools to do the same.

	Ingo