From: Peter Zijlstra <peterz@infradead.org>
To: Raistlin <raistlin@linux.it>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
Song Yuan <song.yuan@ericsson.com>,
Dmitry Adamushko <dmitry.adamushko@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
Nicola Manica <nicola.manica@disi.unitn.it>,
Luca Abeni <lucabe72@email.it>,
Claudio Scordino <claudio@evidence.eu.com>,
Harald Gustafsson <harald.gustafsson@ericsson.com>,
Bjoern Brandenburg <bbb@email.unc.edu>,
bastoni@cs.unc.edu, Giuseppe Lipari <lipari@retis.sssup.it>
Subject: Re: periods and deadlines in SCHED_DEADLINE
Date: Fri, 09 Jul 2010 16:30:00 +0200 [thread overview]
Message-ID: <1278685800.1900.212.camel@laptop> (raw)
In-Reply-To: <1278682707.6083.227.camel@Palantir>
On Fri, 2010-07-09 at 15:38 +0200, Raistlin wrote:
>
> Therefore, here it is my proposal:
> - if the programmer specify both period and deadline, I act as above,
> running the _only_necessary_ test in the kernel, assuming that
> userspace performed some other kind of (correct!) admission test by
> its own, or that it is cool with missing some deadlines... What do
> you think?
It would be good to provide room in the interface to improve upon this
situation.
One thing we could do, although this would make the proposed scheduler a
wee bit more complex, is split between hard and soft realtime. Only
accept P==rel_D for hard, and schedule the soft tasks in the hard slack
or something like that.
That way we can later extend the hard admission tests to accept more.
next prev parent reply other threads:[~2010-07-09 14:30 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-09 13:38 periods and deadlines in SCHED_DEADLINE Raistlin
2010-07-09 14:18 ` Peter Zijlstra
2010-07-09 14:51 ` Bjoern Brandenburg
2010-07-09 16:35 ` Peter Zijlstra
2010-07-10 9:01 ` Raistlin
2010-07-10 10:28 ` Peter Zijlstra
2010-07-10 14:49 ` Raistlin
2010-07-11 6:42 ` Bjoern Brandenburg
2010-08-03 9:41 ` Peter Zijlstra
2010-08-04 3:52 ` Andrea Bastoni
2010-08-04 7:14 ` Peter Zijlstra
2010-08-04 5:18 ` Bjoern Brandenburg
2010-08-03 9:46 ` Peter Zijlstra
2010-08-04 3:53 ` Andrea Bastoni
2010-08-04 5:02 ` Bjoern Brandenburg
2010-07-10 7:08 ` Raistlin
2010-07-11 6:46 ` Bjoern Brandenburg
2010-08-03 8:16 ` Peter Zijlstra
2010-08-03 11:42 ` Gregory Haskins
2010-08-04 6:30 ` Bjoern Brandenburg
2010-07-09 14:24 ` Peter Zijlstra
2010-07-10 7:11 ` Luca Abeni
2010-07-10 10:36 ` Peter Zijlstra
2010-07-11 6:12 ` Bjoern Brandenburg
2010-07-09 14:30 ` Peter Zijlstra [this message]
2010-07-10 9:14 ` Raistlin
2010-07-10 17:19 ` Harald Gustafsson
2010-07-10 18:31 ` Peter Zijlstra
2010-07-10 20:08 ` Harald Gustafsson
2010-07-10 21:52 ` Raistlin
2010-07-11 5:41 ` Harald Gustafsson
2010-07-11 7:32 ` Bjoern Brandenburg
2010-07-12 10:21 ` Harald Gustafsson
2010-08-04 5:55 ` Bjoern Brandenburg
2010-08-02 19:34 ` Peter Zijlstra
2010-08-04 4:44 ` Bjoern Brandenburg
2010-07-09 14:32 ` Peter Zijlstra
2010-07-10 7:50 ` Raistlin
2010-07-10 15:11 ` Peter Zijlstra
2010-07-10 17:29 ` Harald Gustafsson
2010-07-11 6:15 ` Bjoern Brandenburg
2010-07-10 7:09 ` Luca Abeni
2010-07-10 9:20 ` Raistlin
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