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

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Message-ID: <48E6FEB9.8070603@nortel.com>
Date:	Fri, 03 Oct 2008 23:27:21 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	Steven Rostedt <rostedt@...dmis.org>
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

Steven Rostedt wrote:
> 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?

Unfortunately I don't have an x86 box handy for testing...I could 
probably get some time on a lab machine next week.

Chris
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