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

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Message-ID: <1516323645.3417.5.camel@codethink.co.uk>
Date:   Fri, 19 Jan 2018 01:00:45 +0000
From:   Ben Hutchings <ben.hutchings@...ethink.co.uk>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     stable@...r.kernel.org,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        "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 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

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

Ben.

-- 
Ben Hutchings
Software Developer, Codethink Ltd.