linux-kernel - Re: unpredictability in scheduler test results -- still present

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Message-ID: <48E2969F.9000303@nortel.com>
Date:	Tue, 30 Sep 2008 15:14:07 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>
Subject: Re: unpredictability in scheduler test results -- still present

Ingo Molnar wrote:
> * Chris Friesen <cfriesen@...tel.com> wrote:
>> Ingo Molnar wrote:

>>> OTOH, what does 'truning on dftrace' exactly mean? Just enabling it in  
>>> the .config, or also activating it via /debug/tracing/current_tracer?

>> Just enabling it in the .config is enough to trigger the behaviour 
>> change.  I'm not explicitly activating any traces.

> ok, that would be a clear ftrace bug i guess?

It's either an ftrace bug or a fragile load balancer bug.  I wonder if 
it's related somehow to the stop_machine() call in ftrace_dynamic_init()?

Chris
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