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

Cyrill Gorcunov
2010-02-09T21:35:47Z

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@gmail.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