linux-kernel - Re: [PATCH 6/6] sched: disabled rt-bandwidth by default

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Date:	Thu, 28 Aug 2008 22:18:14 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org,
	Stefani Seibold <stefani@...bold.net>,
	Dario Faggioli <raistlin@...ux.it>,
	Max Krasnyansky <maxk@...lcomm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 6/6] sched: disabled rt-bandwidth by default

On Thursday 28 August 2008 22:14, Andi Kleen wrote:
> > Then people can no longer assume stuff like queue_work_on() etc.. works.
> > Users of such code might depend on it actually running on the specified
> > cpu.
>
> If they assume that they're already buggy because CPU hot unplug will break
> affinities.

It is actually possible (with fairly little work, last time I looked,
maybe it is already integrated in the kernel) to avoid all this kind of
thing from isolated CPUs.

But even then, note that the types of programs using the CPU for long
periods are obviously not going to be run on an average desktop system.
So the responsiveness argument is laughable. Responsive as defined how?
And in relation to what type of systems?
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