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Message-Id: <200704221008.50367.kernel@kolivas.org>
Date:	Sun, 22 Apr 2007 10:08:49 +1000
From:	Con Kolivas <kernel@...ivas.org>
To:	Denis Vlasenko <vda.linux@...glemail.com>
Cc:	Ingo Molnar <mingo@...e.hu>, 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

On Sunday 22 April 2007 08:54, Denis Vlasenko wrote:
> On Saturday 21 April 2007 18:00, Ingo Molnar wrote:
> > correct. Note that Willy reniced X back to 0 so it had no relevance on
> > his test. Also note that i pointed this change out in the -v4 CFS
> >
> > announcement:
> > || Changes since -v3:
> > ||
> > ||  - usability fix: automatic renicing of kernel threads such as
> > ||    keventd, OOM tasks and tasks doing privileged hardware access
> > ||    (such as Xorg).
> >
> > i've attached it below in a standalone form, feel free to put it into
> > SD! :)
>
> But X problems have nothing to do with "privileged hardware access".
> X problems are related to priority inversions between server and client
> processes, and "one server process - many client processes" case.

It's not a privileged hardware access reason that this code is there. This is 
obfuscation/advertising to make it look like there is a valid reason for X 
getting negative nice levels somehow in the kernel to make interactive 
testing of CFS better by default.

-- 
-ck
-
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