linux-kernel - Re: [PATCH -v2 7/9] sched,tracing: Update trace_sched_pi

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Message-ID: <20160927074434.GO2794@worktop>
Date:   Tue, 27 Sep 2016 09:44:34 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     mingo@...nel.org, tglx@...utronix.de, juri.lelli@....com,
        xlpang@...hat.com, bigeasy@...utronix.de,
        linux-kernel@...r.kernel.org, mathieu.desnoyers@...icios.com,
        jdesfossez@...icios.com, bristot@...hat.com
Subject: Re: [PATCH -v2 7/9] sched,tracing: Update trace_sched_pi_setprio()

On Mon, Sep 26, 2016 at 01:04:30PM -0400, Steven Rostedt wrote:
> On Mon, 26 Sep 2016 14:32:20 +0200
> Peter Zijlstra <peterz@...radead.org> wrote:
> 
> > Pass the PI donor task, instead of a numerical priority.
> > 
> > Numerical priorities are not sufficient to describe state ever since
> > SCHED_DEADLINE.
> > 
> > Annotate all sched tracepoints that are currently broken; fixing them
> > will bork userspace. *hate*.
> 
> Perhaps display -1 for SCHED_DEADLINE tasks?

I think it already does that, but that's plenty useless.