linux-kernel - Re: [perf] howto switch from pfmon

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Date:	Tue, 23 Jun 2009 15:22:31 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Brice Goglin <Brice.Goglin@...ia.fr>, paulus@...ba.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [perf] howto switch from pfmon

On Tue, 2009-06-23 at 15:14 +0200, Ingo Molnar wrote:
> * Brice Goglin <Brice.Goglin@...ia.fr> wrote:
> 
> > Hello,
> >
> > I am trying to play with perfcounters in current git (actually in
> > latest mmotm). I'd like to reproduce what I previously did with
> > pfmon, but I couldn't so far.
> >
> > Something like
> >     pfmon --follow-exec 'foobar' -e
> > CPU_TO_DRAM_REQUESTS_TO_TARGET_NODE:LOCAL_TO_0,CPU_TO_DRAM_REQUESTS_TO_TARGET_NODE:LOCAL_TO_1
> > -- <shell script>
> > gives the number of memory accesses to dram node #0 and #1 for all
> > processes whose name matches 'foobar'.
> >
> > So there are several questions here:
> > 1) is it possible to specify counter names like the above or do we have
> > to use raw counter numbers? I tried raw numbers from [1] without
> > success. How am I supposed to find and specify these raw numbers?
> > 2) how do we specify "subevents"?
> > 3) is there anything similar to --follow-exec, or --follow-pthreads for
> > getting separated outputs for each thread?
> >
> > I guess there are still a lot of things on the TODOlist but I'd 
> > like to understand a bit more where things are going. Sorry I 
> > didn't read all the archives about this, there are way too many of 
> > them recently :)
> 
> Yeah, there's indeed still a lot on the TODO list :-)
> 
> CPU_TO_DRAM_REQUESTS_TO_TARGET_NODE is a Barcelona hardware event, 
> so if you know that it maps to raw ID 0x100000e0 then you can always 
> extend the events that 'perf' knows about via raw events:
> 
>  $ perf stat -e cycles -e instructions -e r1000ffe0 ./hackbench 10
>  Time: 0.186
> 
>  Performance counter stats for './hackbench 10':
> 
>      4381248335  cycles
>      1964394846  instructions         #      0.448 IPC
>             838  raw 0x1000ffe0
> 
>     0.215382037  seconds time elapsed.

Just to clarify, The event code is 1E0h, and Ingo used a FFh unit mask.
These are combined using the arch masks below:

#define K7_EVNTSEL_EVENT_MASK   0x7000000FFULL
#define K7_EVNTSEL_UNIT_MASK    0x00000FF00ULL

to form the raw event code used: 0x1000ffe0

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