linux-kernel - Re: [BUG] perf stat: useless output for raw events with new event parser

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Date:	Mon, 23 Apr 2012 12:57:26 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>, mingo@...e.hu,
	David Ahern <dsahern@...il.com>,
	Robert Richter <robert.richter@....com>,
	Frédéric Weisbecker <fweisbec@...il.com>
Subject: Re: [BUG] perf stat: useless output for raw events with new event
 parser

On Mon, Apr 23, 2012 at 12:45:34PM +0200, Stephane Eranian wrote:
> Hi,
> 
> With the new event parser, one can express raw events field by field:
> 
> $ perf stat -e cpu/event=0x3c,umask=0x0/,cpu/event=0xc5,umask=0x0/ noploop 1
> 
> The problem with this is that the output of perf stat becomes useless:
> 
> $ perf stat -e cpu/event=0x3c,umask=0x0/,cpu/event=0xc5,umask=0x0/ noploop 1
> noploop for 1 seconds
> 
>  Performance counter stats for 'noploop 1':
> 
>         2395038678 pmu
>             10787 pmu
>                        ^^^^^^
>        1.000802603 seconds time elapsed
> 
> We lose the event names or encoding completely. Now for all events
> expressed via this
> new syntax , all we see is 'pmu'. That is pretty useless. It is hard
> to decrypt the results
> without some serious scripting.
> 
> Not sure how to solve this given how the parser works. This looks like
> a regression to me.

I dont think thats regression, since you use new way to express an event.
Please check my answer in the other reply to Peter.

thanks,
jirka
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