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From: Luca Abeni <luca.abeni@unitn.it>
To: Peter Zijlstra <peterz@infradead.org>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
	Juri Lelli <juri.lelli@arm.com>
Subject: Re: [RFC 8/8] Do not reclaim the whole CPU bandwidth
Date: Fri, 15 Jan 2016 10:49:37 +0100	[thread overview]
Message-ID: <20160115104937.6a11cdc4@luca-1225C> (raw)
In-Reply-To: <20160115085004.GE3421@worktop>

On Fri, 15 Jan 2016 09:50:04 +0100
Peter Zijlstra <peterz@infradead.org> wrote:
[...]
> The trouble is with interfaces. Once we expose them we're stuck with
> them. And from that POV I think an explicit SCHED_OTHER server (or a
> minimum budget for a slack time scheme) makes more sense.
> 
> It provides this same information while also providing more benefit,
> no?
>From an interface point of view, I agree.

> > >That would maybe fit in nicely with the DL based FIFO/RR servers
> > >from this other pending project.
> > Yes, this reminds me about the half-finished patch for RT
> > throttling using SCHED_DEADLINE... But that patch needs much more
> > work IMHO.
> 
> IIRC two years ago at RTLWS there was a presentation that the SMP
> issues were 'solved' and they would be posting the patches 'soon'. 
Do you mean this paper?
http://retis.sssup.it/~nino/publication/rtlws14bdm.pdf

I started from that patch, and I have something that "basically works",
but I am still discussing some theoretical and implementation issues
with the paper's authors.



				Luca

  reply	other threads:[~2016-01-15  9:49 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-14 15:24 [RFC 0/8] CPU reclaiming for SCHED_DEADLINE Luca Abeni
2016-01-14 15:24 ` [RFC 1/8] Track the active utilisation Luca Abeni
2016-01-14 16:49   ` Peter Zijlstra
2016-01-15  6:37     ` Luca Abeni
2016-01-14 19:13   ` Peter Zijlstra
2016-01-15  8:07     ` Luca Abeni
2016-01-14 15:24 ` [RFC 2/8] Correctly track the active utilisation for migrating tasks Luca Abeni
2016-01-14 15:24 ` [RFC 3/8] sched/deadline: add some tracepoints Luca Abeni
2016-01-14 15:24 ` [RFC 4/8] Improve the tracking of active utilisation Luca Abeni
2016-01-14 17:16   ` Peter Zijlstra
2016-01-15  6:48     ` Luca Abeni
2016-01-14 19:43   ` Peter Zijlstra
2016-01-15  9:27     ` Luca Abeni
2016-01-19 12:20     ` Luca Abeni
2016-01-19 13:47       ` Peter Zijlstra
2016-01-27 13:36         ` Luca Abeni
2016-01-27 14:39           ` Peter Zijlstra
2016-01-27 14:45             ` Luca Abeni
2016-01-28 13:08               ` Vincent Guittot
     [not found]               ` <CAKfTPtAt0gTwk9aAZN238NT1O-zJvxVQDTh2QN_KxAnE61xMww@mail.gmail.com>
2016-01-28 13:48                 ` luca abeni
2016-01-28 13:56                   ` Vincent Guittot
2016-01-28 11:14             ` luca abeni
2016-01-28 12:21               ` Peter Zijlstra
2016-01-28 13:41                 ` luca abeni
2016-01-28 14:00                   ` Peter Zijlstra
2016-01-28 21:15                     ` Luca Abeni
2016-01-14 19:47   ` Peter Zijlstra
2016-01-15  8:10     ` Luca Abeni
2016-01-15  8:32       ` Peter Zijlstra
2016-01-14 15:24 ` [RFC 5/8] Track the "total rq utilisation" too Luca Abeni
2016-01-14 19:12   ` Peter Zijlstra
2016-01-15  8:04     ` Luca Abeni
2016-01-14 19:48   ` Peter Zijlstra
2016-01-15  6:50     ` Luca Abeni
2016-01-15  8:34       ` Peter Zijlstra
2016-01-15  9:15         ` Luca Abeni
2016-01-29 15:06           ` Peter Zijlstra
2016-01-29 21:21             ` Luca Abeni
2016-01-14 15:24 ` [RFC 6/8] GRUB accounting Luca Abeni
2016-01-14 19:50   ` Peter Zijlstra
2016-01-15  8:05     ` Luca Abeni
2016-01-14 15:24 ` [RFC 7/8] Make GRUB a task's flag Luca Abeni
2016-01-14 19:56   ` Peter Zijlstra
2016-01-15  8:15     ` Luca Abeni
2016-01-15  8:41       ` Peter Zijlstra
2016-01-15  9:08         ` Luca Abeni
2016-01-14 15:24 ` [RFC 8/8] Do not reclaim the whole CPU bandwidth Luca Abeni
2016-01-14 19:59   ` Peter Zijlstra
2016-01-15  8:21     ` Luca Abeni
2016-01-15  8:50       ` Peter Zijlstra
2016-01-15  9:49         ` Luca Abeni [this message]
2016-01-26 12:52         ` luca abeni
2016-01-27 14:44           ` Peter Zijlstra
2016-02-02 20:53             ` Luca Abeni
2016-02-03 11:30               ` Juri Lelli
2016-02-03 13:28                 ` luca abeni
2016-01-19 10:11 ` [RFC 0/8] CPU reclaiming for SCHED_DEADLINE Juri Lelli
2016-01-19 11:50   ` Luca Abeni

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