linux-kernel - Re: [PATCH 3/4] tracing/sched: Add sched_rt_push and sched_rt

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Date:	Tue, 21 Sep 2010 09:36:27 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Gregory Haskins <ghaskins@...ell.com>
Subject: Re: [PATCH 3/4] tracing/sched: Add sched_rt_push and sched_rt_pull
 tracepoints

On Tue, 2010-09-21 at 08:33 -0400, Steven Rostedt wrote:

> > Why doesn't the migration tracepoint cover this? It shows you the task,
> > the prio, the old and new cpu. If the migration is logged from the old
> > cpu, its a push, if its logged from the new its a pull, no?
> 
> For some reason it did not help me enough in my analysis. I'll go back
> and see why.
> 
> I originally had these tracepoints at the front of the series, and
> realized they may be a little controversial, thus I moved them to the
> end.

OK, I went back and looked, and I think you are right. I can determine
this from the migration tracepoint. I think I was just being lazy and
wanted to have the direction obvious to me :-)  I can easily do that by
adding a plugin.

Anyway, I'll remove this patch and rename the sched_rt_setprio
tracepoint to sched_pi_setprio. Would that be OK with you?

Thanks,

-- Steve


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