linux-kernel - Re: [RFC][PATCH 0/6] perf: x86 RDPMC and RDTSC support

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Date:	Mon, 21 Nov 2011 10:02:09 -0500 (EST)
From:	Vince Weaver <vince@...ter.net>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
cc:	mingo@...e.hu, William Cohen <wcohen@...hat.com>,
	Stephane Eranian <eranian@...gle.com>,
	Arun Sharma <asharma@...com>, linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 0/6] perf: x86 RDPMC and RDTSC support

On Mon, 21 Nov 2011, Peter Zijlstra wrote:

> These few patches implement x86 RDPMC support and add an extention to the self
> monitoring data to also allow additional time updates using userspace TSC reads.
> 
> There's a few loose ends, but it mostly seems to work.

I'll have to test these out.  

I have some low-level benchmarks I've been working on, you can see some 
preliminary results here:
   http://web.eecs.utk.edu/~vweaver1/projects/perf-events/benchmarks/

perf_events was lagging behind perfmon2 and perfctr in self-monitoring 
overhead, but maybe these changes will help that.

perf_event overhead got a lot worse between 2.6.32 and 3.0, I'm mid-bisect 
on that trying to isolate the cause.

Vince

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