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

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Date:   Mon, 26 Sep 2016 13:04:30 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Peter Zijlstra <peterz@...radead.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, 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?

-- Steve

> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>

Reviewed-by: Steven Rostedt <rostedt@...dmis.org.

-- Steve