From: Peter Zijlstra <peterz@infradead.org>
To: Luca Abeni <luca.abeni@unitn.it>
Cc: linux-kernel@vger.kernel.org,
Tommaso Cucinotta <tommaso.cucinotta@sssup.it>,
Juri Lelli <juri.lelli@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
Andrea Parri <parri.andrea@gmail.com>
Subject: Re: About group scheduling for SCHED_DEADLINE
Date: Mon, 10 Oct 2016 13:08:18 +0200 [thread overview]
Message-ID: <20161010110818.GA11311@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <20161010101558.GL3568@worktop.programming.kicks-ass.net>
On Mon, Oct 10, 2016 at 12:15:58PM +0200, Peter Zijlstra wrote:
> However, I think there's a third alternative. I have memories of a paper
> from UNC (I'd have to dig through the site to see if I can still find
> it) where they argue that for a hierarchical (G-)FIFO you should use
> minimal concurrency, that is run the minimal number of (v)cpu servers.
>
> This would mean we give a single CBS parameter and carve out the minimal
> number (of max CBS) (v)cpu that fit in that.
>
> I'm just not sure how the random affinity crap works out for that, if we
> have the (v)cpu servers migratable in the G-EDF and migrate to whatever
> is demanded by the task at runtime it might work, but who knows..
> Analysis would be needed I think.
Hurm,.. thinking slightly more on this, this ends up being a DL task
with random affinity, which is problematic IIRC.
next prev parent reply other threads:[~2016-10-10 11:08 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-09 19:39 Luca Abeni
2016-10-10 10:15 ` Peter Zijlstra
2016-10-10 11:08 ` Peter Zijlstra [this message]
2016-10-16 19:40 ` Luca Abeni
2016-10-17 6:38 ` luca abeni
2016-10-17 8:25 ` Peter Zijlstra
2016-10-18 9:43 ` Juri Lelli
2016-10-10 12:04 ` Peter Zijlstra
2016-10-16 19:34 ` Luca Abeni
2016-10-17 10:52 ` Peter Zijlstra
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