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 5/8] Track the "total rq utilisation" too
Date: Fri, 15 Jan 2016 10:15:11 +0100 [thread overview]
Message-ID: <20160115101511.726cfe29@luca-1225C> (raw)
In-Reply-To: <20160115083359.GC3421@worktop>
On Fri, 15 Jan 2016 09:34:00 +0100
Peter Zijlstra <peterz@infradead.org> wrote:
> On Fri, Jan 15, 2016 at 07:50:49AM +0100, Luca Abeni wrote:
> > On Thu, 14 Jan 2016 20:48:37 +0100
> > Peter Zijlstra <peterz@infradead.org> wrote:
> >
> > > On Thu, Jan 14, 2016 at 04:24:50PM +0100, Luca Abeni wrote:
> > > > This is the sum of the utilisations of tasks that are assigned
> > > > to a runqueue, independently from their state (TASK_RUNNING or
> > > > blocked)
> > >
> > > Is it actually used?
> > Not in this patchset...
> > It is a possible "cheap" (but less accurate) alternative to the
> > tracking introduced in patch 4. Or can be used in more advanced
> > implementations of multi-processor GRUB, but not in this patchset.
> >
> > So, it can be removed from the patchset; I added it so that people
> > can see all the possible alternative utilization tracking
> > strategies.
>
> OK, so that might've been useful text for the changelog. But given
> that, maybe leave it out for now.
>
> BTW, have you got a paper on smp grub?
The one mentioned in the cover letter describes the implementation I
posted:
http://disi.unitn.it/~abeni/reclaiming/rtlws14-grub.pdf
There is also a newer paper, that will be published at ACM SAC 2016
(so, it is not available yet), but is based on this technical report:
http://arxiv.org/abs/1512.01984
This second paper describes some more complex algorithms (easily
implementable over this patchset) that are able to guarantee hard
schedulability for SCHED_DEADLINE tasks with reclaiming on SMP.
Luca
next prev parent reply other threads:[~2016-01-15 9:15 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 [this message]
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
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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