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From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Ingo Molnar <mingo@elte.hu>
Subject: Re: [PATCH 6/6] sched: disabled rt-bandwidth by default
Date: Tue, 26 Aug 2008 19:44:46 +1000
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Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>, linux-kernel@vger.kernel.org,
       Stefani Seibold <stefani@seibold.net>,
       Dario Faggioli <raistlin@linux.it>, Max Krasnyansky <maxk@qualcomm.com>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Thomas Gleixner <tglx@linutronix.de>
References: <20080819103301.787700742@chello.nl> <200808261900.07383.nickpiggin@yahoo.com.au> <20080826093059.GA471@elte.hu>
In-Reply-To: <20080826093059.GA471@elte.hu>
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On Tuesday 26 August 2008 19:30, Ingo Molnar wrote:
> * Nick Piggin <nickpiggin@yahoo.com.au> wrote:
> > So... no reply to this? I'm really wondering how it's OK to break
> > documented standards and previous Linux behaviour by default for
> > something that it is trivial to solve in userspace? [...]
>
> I disagree 

Disagree with what? That it's a problem to basically break the guarantee
realtime SCHED_ policies have previously provided?


> and what do you mean by "trivial to solve in user-space"? 

I mean that if some distro has turned on the RT scheduling ulimit by
default and now finds themselves with a local DoS for unpriviliged users
as a result, then either that distro should just make their init scripts
set the throttle and break the API themselves, or they should start a
watchdog at a higher priority than unprivileged user can set.
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