From: Peter Zijlstra <peterz@infradead.org>
To: Jamie Lokier <jamie@shareable.org>
Cc: sen wang <wangsen.linux@gmail.com>,
mingo@elte.hu, akpm@linux-foundation.org, kernel@kolivas.org,
npiggin@suse.de, arjan@infradead.org,
linux-arm-kernel@lists.arm.linux.org.uk,
linux-kernel@vger.kernel.org
Subject: Re: report a bug about sched_rt
Date: Fri, 24 Jul 2009 18:01:19 +0200 [thread overview]
Message-ID: <1248451279.6987.138.camel@twins> (raw)
In-Reply-To: <20090724154036.GG27755@shareable.org>
On Fri, 2009-07-24 at 16:40 +0100, Jamie Lokier wrote:
> Peter Zijlstra wrote:
> > If you're using the bandwidth throttle to control your RT tasks so as
> > not to starve your SCHED_OTHER tasks, then I will call your system ill
> > designed.
>
> What mechanism should be used to avoid starving SCHED_OTHER tasks, in
> the event there are unforeseen bugs or unpredictable calculation times
> in an RT task?
For bugs the throttle works, like I said a well functioning system is
not supposed to hit the throttle, obviously a bug precludes the well
functioning qualification :-)
Unpredictable calculation times can be dealt with on the application
design level, for example using techniques such as outlined here:
http://feanor.sssup.it/~faggioli/papers/OSPERT-2009-dlexception.pdf
These really are things you should know about before writing an RT
application ;-)
next prev parent reply other threads:[~2009-07-24 15:59 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-24 10:57 report a bug about sched_rt sen wang
2009-07-24 12:14 ` Peter Zijlstra
2009-07-24 13:04 ` sen wang
2009-07-24 13:14 ` Peter Zijlstra
2009-07-24 13:26 ` sen wang
2009-07-24 13:33 ` Peter Zijlstra
2009-07-24 13:44 ` sen wang
2009-07-24 13:54 ` Peter Zijlstra
2009-07-24 14:04 ` sen wang
2009-07-24 14:48 ` Peter Zijlstra
2009-07-24 14:53 ` sen wang
2009-07-24 15:07 ` sen wang
2009-07-24 15:24 ` Peter Zijlstra
2009-07-24 15:43 ` sen wang
2009-07-24 15:34 ` Thomas Gleixner
2009-07-25 11:12 ` Raistlin
2009-07-24 14:24 ` sen wang
2009-07-24 14:48 ` Peter Zijlstra
2009-07-24 15:02 ` sen wang
2009-07-24 15:40 ` Jamie Lokier
2009-07-24 16:01 ` Peter Zijlstra [this message]
2009-07-24 23:30 ` Jamie Lokier
2009-07-25 5:22 ` Bill Gatliff
2009-07-25 22:48 ` Jamie Lokier
2009-07-26 2:44 ` Bill Gatliff
2009-07-26 19:03 ` Jamie Lokier
2009-07-27 10:45 ` Peter Zijlstra
2009-07-27 13:35 ` Bill Gatliff
2009-07-25 12:33 ` Raistlin
2009-07-25 14:58 ` Tommaso Cucinotta
2009-07-25 12:19 ` Raistlin
2009-07-25 22:54 ` Jamie Lokier
2009-07-25 23:24 ` Tommaso Cucinotta
2009-07-25 11:10 ` Raistlin
[not found] ` <454c71700907250429i1c77658bt6d65b02f08a29f4a@mail.gmail.com>
2009-07-25 23:01 ` Jamie Lokier
2009-07-24 14:28 ` Arjan van de Ven
2009-07-26 3:55 ` sen wang
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