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

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Message-Id: <1219997165.17355.42.camel@twins>
Date:	Fri, 29 Aug 2008 10:06:05 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Mike Galbraith <efault@....de>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mark Hounschell <markh@...pro.net>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Stefani Seibold <stefani@...bold.net>,
	Dario Faggioli <raistlin@...ux.it>,
	Max Krasnyansky <maxk@...lcomm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 6/6] sched: disabled rt-bandwidth by default

On Fri, 2008-08-29 at 09:56 +0200, Mike Galbraith wrote:
> On Thu, 2008-08-28 at 14:53 -0400, Steven Rostedt wrote:
> > On Thu, 28 Aug 2008, Linus Torvalds wrote:
> > > 
> > > And I'm not really interested. Quite frankly, I suspect the "we want to 
> > > run something like pulseaudio with RT priorities" camp is the more common 
> > > one, and in that context I understand limiting SCHED_FIFO sounds perfectly 
> > > understandable.
> > 
> > The fact that it actually limits a SCHED_FIFO task group, over a single 
> > task thread does bother me a little.
> 
> It bothers me some too.  You have to patch/re-compile the kernel if you
> need to turn it off and don't have SCHED_DEBUG enabled (not free).

/proc/sys/kernel/sched_rt_{runtime,period}_us don't require SCHED_DEBUG.
If they are in any way non-functional on SCHED_DEBUG=n then that's a
clear bug.

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