linux-kernel - Re: [RFC perf,x86] P4 PMU early draft

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Message-ID: <20100209213542.GC5068@lenovo>
Date:	Wed, 10 Feb 2010 00:35:42 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Don Zickus <dzickus@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC perf,x86] P4 PMU early draft

On Tue, Feb 09, 2010 at 10:13:59PM +0100, Stephane Eranian wrote:
> Cyrill,
> 
> On Mon, Feb 8, 2010 at 7:45 PM, Cyrill Gorcunov <gorcunov@...il.com> wrote:
...
> >
> > Stephane, I know you've been (and still is, right?) working on P4 driver
> > for libpmu (not sure if I remember correctly this name). Perhaps we should
> > take some ideas from there?
> >
> The library is called libpfm (perfmon) and libpfm4 (perf_events). It has
> support for Netburst (pentium4). It does the assignment of events to
> counters in user mode. I did not write the P4 support and it was a very long
> time ago. I don't recall all the details, except that this was really difficult.
> You may want to take a look at pfmlib_pentium4.c.

Yeah, I've a look taken on it. Interesting. Thanks! Will take more precise look
as only get spare time slot :)

> 
> I am still actively developing libpfm4 for perf_events. The P4 support is
> not available because I don't know how perf_events is going to support
> it. I'll update the library once that is settled.
> 
	-- Cyrill
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