linux-kernel - Re: [PATCH v2 03/13] ANDROID: binder: add support for RT prio inheritance.

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Message-ID: <CAB0TPYED3thad+GMBYjTGC=gRwjby5MNrGfkeN6qvZtWoaNohw@mail.gmail.com>
Date:   Thu, 31 Aug 2017 10:27:58 +0200
From:   Martijn Coenen <maco@...roid.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        John Stultz <john.stultz@...aro.org>,
        Todd Kjos <tkjos@...gle.com>,
        Arve Hjønnevåg <arve@...roid.com>,
        Amit Pundir <amit.pundir@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Christoph Hellwig <hch@....de>,
        LKML <linux-kernel@...r.kernel.org>, devel@...verdev.osuosl.org,
        Martijn Coenen <maco@...gle.com>,
        Iliyan Malchev <malchev@...gle.com>,
        Colin Cross <ccross@...roid.com>
Subject: Re: [PATCH v2 03/13] ANDROID: binder: add support for RT prio inheritance.

On Thu, Aug 31, 2017 at 10:18 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> You fail to support SCHED_DEADLINE, that's not optional.

The reason I didn't include it is that we don't use SCHED_DEADLINE in
Android userspace. Can we add support for this in a follow-up patch,
or do you consider it necessary for accepting this series? If so I'm
curious why, since the driver will still work correctly even for
SCHED_DEADLINE tasks; it just won't inherit priority in that case
(much like it didn't inherit FIFO/RR priorities before this patch).