linux-kernel - Re: [PATCH] perf, p4: Add format attributes

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Date:	Tue, 27 Mar 2012 19:12:50 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Jiri Olsa <jolsa@...hat.com>,
	Lin Ming <ming.m.lin@...el.com>, rostedt <rostedt@...dmis.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf, p4: Add format attributes

On Tue, Mar 27, 2012 at 05:05:59PM +0200, Peter Zijlstra wrote:
> > 
> > Thanks a lot, Peter! This format description is somewhat
> > new to me (I think I've missed when it was introduced first
> > time).
> 
> Yeah, its all brand-spanking new stuff.. see
> https://lkml.org/lkml/2012/1/16/146 , Jiri added a full fledged
> bison/yacc parser to perf so we can now write events like:
> 
> perf stat -e cpu/event=0xb7,umask=0x01,offcore_rsp=0x500b/
> 
> and it uses /sys/bus/event_source/devices/cpu/format/* to figure out how
> to convert that into perf_event_attr::config{,1,2} values.
> 
> So with this patch you could, on your P4, write:
> 
> perf stat -e cpu/cccr=0x1234,escr=0x4321,ht/
> 
> and it would construct the perf_event_attr::config value 0x92344321 for
> you.
> 

Ah, I see thanks for the reference, Peter!

> I've still not actually read the P4-PMU specs, so I don't know if
> there's anything more convenient we can do on P4. If there's a
> better/more useful format representation possible, don't hesitate to
> send a patch! :-)

Sure, I'll try to find some time tonight to read this brand
new stuff. And if I find something -- will send out. At moment
your patch should be more than enough ;)

	Cyrill
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