From: Peter Zijlstra <peterz@infradead.org>
To: Luca Abeni <luca.abeni@unitn.it>
Cc: Kirill Tkhai <tkhai@yandex.ru>, Juri Lelli <juri.lelli@arm.com>,
Ingo Molnar <mingo@redhat.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"juri.lelli@gmail.com" <juri.lelli@gmail.com>
Subject: Re: Another SCHED_DEADLINE bug (with bisection and possible fix)
Date: Thu, 15 Jan 2015 13:23:23 +0100 [thread overview]
Message-ID: <20150115122323.GU23965@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <54B7A33F.20904@unitn.it>
On Thu, Jan 15, 2015 at 12:23:43PM +0100, Luca Abeni wrote:
> There are some parts of the patch that I do not understand (for example:
> if I understand well, if the task is not throttled you set dl_new to 1...
> And if it is throttled you change its current runtime and scheduling deadline...
> Why?)
> Anyway, I tested the patch and I confirm that it fixes the hang I originally
> reported.
I'll go look at the patch in a wee bit. But Juri, Luca, could you
describe the correct behaviour?
>From what I understand we should either modify the tasks run/sleep stats
when we change its parameters or we should schedule a delayed release of
the bandwidth delta (when it reaches its 0-lag point, if thats in the
future).
Doing neither will allow one to game the reservation system afaict.
next prev parent reply other threads:[~2015-01-15 12:23 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-29 23:27 luca abeni
2015-01-04 22:51 ` Kirill Tkhai
2015-01-05 15:21 ` Luca Abeni
2015-01-05 23:07 ` Kirill Tkhai
2015-01-07 7:01 ` Luca Abeni
2015-01-07 12:29 ` Kirill Tkhai
2015-01-07 12:45 ` Luca Abeni
2015-01-07 13:04 ` Kirill Tkhai
2015-01-07 13:14 ` Luca Abeni
2015-01-09 11:15 ` Luca Abeni
2015-01-09 11:46 ` Kirill Tkhai
2015-01-13 8:10 ` Juri Lelli
2015-01-13 9:26 ` Kirill Tkhai
2015-01-13 14:04 ` Peter Zijlstra
2015-01-14 12:43 ` Kirill Tkhai
2015-01-15 11:23 ` Luca Abeni
2015-01-15 12:23 ` Peter Zijlstra [this message]
2015-01-15 13:35 ` Luca Abeni
2015-01-28 14:08 ` Peter Zijlstra
2015-01-28 14:40 ` Luca Abeni
2015-01-30 10:25 ` Luca Abeni
2015-01-30 10:35 ` Juri Lelli
2015-01-31 9:56 ` Peter Zijlstra
2015-02-02 11:31 ` Juri Lelli
2015-02-02 13:57 ` Luca Abeni
2015-02-04 14:34 ` [tip:sched/core] sched/deadline: Fix deadline parameter modification handling tip-bot for Peter Zijlstra
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