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

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Message-ID: <1285072416.23122.1723.camel@gandalf.stny.rr.com>
Date:	Tue, 21 Sep 2010 08:33:36 -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 10:46 +0200, Peter Zijlstra wrote:
> On Mon, 2010-09-20 at 22:40 -0400, Steven Rostedt wrote:
> > From: Steven Rostedt <srostedt@...hat.com>
> > 
> > Seeing how tasks are affected by the push/pull algorithm of the RT
> > scheduler helps in understanding the migration of RT tasks.
> > 
> > Adding these two tracepoints to show when an RT task is pushed from
> > one CPU to another, or pulled helps with analyzing the way the
> > scheduler works. 
> 
> 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.

-- Steve


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