linux-kernel - Re: [bug report] sched: stop_machine() usage causes load balancer to misbehave

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Message-ID: <alpine.DEB.1.10.0810022001250.26504@gandalf.stny.rr.com>
Date:	Thu, 2 Oct 2008 20:02:57 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Chris Friesen <cfriesen@...tel.com>
cc:	Ingo Molnar <mingo@...e.hu>,
	Linux kernel <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [bug report] sched: stop_machine() usage causes load balancer
 to misbehave


On Thu, 2 Oct 2008, Chris Friesen wrote:

> I mentioned before that ftrace (specifically the ftraced daemon) seems to be
> interfering with the load balancer.  After some experimenting, it appears that
> any regular calls to stop_machine() will end up confusing the load balancer.
> 
> As an experiment, I disabled ftraced (which would normally result in correct
> load balancing) but added a single kernel thread which simply runs the
> following loop, where "chrisd2" is a dummy function.


Chris,

Thanks for looking into this. I don't have an answer for your question, 
but I'll work harder to get the MCOUNT_REC working in PPC.

Does this happen with x86 too?

-- Steve
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