linux-kernel - Re: [PATCH 4.4 045/115] sched/deadline: Throttle a constrained deadline task activated after the deadline

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Date:   Fri, 19 Jan 2018 14:13:55 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Daniel Bristot de Oliveira <bristot@...hat.com>
Cc:     Ben Hutchings <ben.hutchings@...ethink.co.uk>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Juri Lelli <juri.lelli@....com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Luca Abeni <luca.abeni@...tannapisa.it>,
        Mike Galbraith <efault@....de>,
        Romulo Silva de Oliveira <romulo.deoliveira@...c.br>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tommaso Cucinotta <tommaso.cucinotta@...up.it>,
        Ingo Molnar <mingo@...nel.org>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: Re: [PATCH 4.4 045/115] sched/deadline: Throttle a constrained
 deadline task activated after the deadline

On Fri, Jan 19, 2018 at 01:40:03PM +0100, Greg Kroah-Hartman wrote:
> On Fri, Jan 19, 2018 at 01:16:01PM +0100, Daniel Bristot de Oliveira wrote:
> > On 01/19/2018 08:53 AM, Greg Kroah-Hartman wrote:
> > > On Fri, Jan 19, 2018 at 01:00:45AM +0000, Ben Hutchings wrote:
> > >> On Mon, 2017-12-18 at 16:48 +0100, Greg Kroah-Hartman wrote:
> > >>> 4.4-stable review patch.  If anyone has any objections, please let me
> > >>> know.
> > >>>
> > >>> ------------------
> > >>>
> > >>> From: Daniel Bristot de Oliveira <bristot@...hat.com>
> > >>>
> > >>>
> > >>> [ Upstream commit df8eac8cafce7d086be3bd5cf5a838fa37594dfb ]
> > >> [...]
> > >>
> > >> I think this needs another fix on top:
> > >>
> > >> commit ae83b56a56f8d9643dedbee86b457fa1c5d42f59
> > >> Author: Xunlei Pang <xlpang@...hat.com>
> > >> Date:   Wed May 10 21:03:37 2017 +0800
> > >>
> > >>     sched/deadline: Zero out positive runtime after throttling constrained tasks
> > > 
> > > Now queued up, thanks.
> > > 
> > >> There's another fix related to this, but it doesn't appear to fix a
> > >> regression and I don't know how critical it is:
> > >>
> > >> commit 3effcb4247e74a51f5d8b775a1ee4abf87cc089a
> > >> Author: Daniel Bristot de Oliveira <bristot@...hat.com>
> > >> Date:   Mon May 29 16:24:03 2017 +0200
> > >>
> > >>     sched/deadline: Use the revised wakeup rule for suspending constrained dl tasks
> > > 
> > > I'll hold off on this one until someone actually asks for it, as it's a
> > > big change.
> > > 
> > > thanks again for the review,
> > 
> > Hi,
> > 
> > This fix is also needed. Do you guys need some help in the backport? if
> > so, please let me know! I will be glad to help.
> 
> I've now backported it, was just some comment and formatting issues that
> needed to be adjusted.

Nope, my attempt broke the build :(

If you could provide a working backport, that would be great.

thanks,

greg k-h