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Re: perf: multiplexing broken on amd fam16h?

From	Peter Zijlstra <peterz@infradead.org>
Newsgroups	linux.kernel
Subject	Re: perf: multiplexing broken on amd fam16h?
Date	2015-07-22 17:10 +0200
Message-ID	<pP3OF-1Xp-1@gated-at.bofh.it> (permalink)
References	<pOK9k-7tF-25@gated-at.bofh.it> <pOLyp-UT-5@gated-at.bofh.it> <pOM1r-1Il-1@gated-at.bofh.it> <pP1jQ-6Jj-17@gated-at.bofh.it> <pP3EZ-1wt-3@gated-at.bofh.it>
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On Wed, Jul 22, 2015 at 10:57:23AM -0400, Vince Weaver wrote:
> On Wed, 22 Jul 2015, Peter Zijlstra wrote:

> > Can you run with something like the below?
> 
> OK, so I have to admit I'm a bit weak on ftrace.  What type of command 
> line are you interested in seeing?  The ones I've tried with trace-cmd
> have  activated  your trace_printks but there's 500MB of other data mixed 
> in so maybe I am doing something wrong.

something along the lines of:

echo function > /debug/tracing/current_tracer
echo nop > /debug/tracing/current_tracer
echo 0 > /debug/tracing/trace

./check_multiplexing

echo 0 > /debug/tracing/tracing_on
cat /debug/tracing/trace > ~/trace.log

I've no idea how trace-cmd works, I don't even think I have it :-)
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Re: perf: multiplexing broken on amd fam16h? Peter Zijlstra <peterz@infradead.org> - 2015-07-22 14:30 +0200
  Re: perf: multiplexing broken on amd fam16h? Vince Weaver <vincent.weaver@maine.edu> - 2015-07-22 17:00 +0200
    Re: perf: multiplexing broken on amd fam16h? Peter Zijlstra <peterz@infradead.org> - 2015-07-22 17:10 +0200
      Re: perf: multiplexing broken on amd fam16h? Peter Zijlstra <peterz@infradead.org> - 2015-07-22 17:50 +0200
        Re: perf: multiplexing broken on amd fam16h? Vince Weaver <vincent.weaver@maine.edu> - 2015-07-22 18:50 +0200
  Re: perf: multiplexing broken on amd fam16h? Vince Weaver <vincent.weaver@maine.edu> - 2015-07-22 17:00 +0200
    Re: perf: multiplexing broken on amd fam16h? Peter Zijlstra <peterz@infradead.org> - 2015-07-22 17:10 +0200

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