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

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Date:	Wed, 2 May 2012 13:14:33 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	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>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [BUG] perf stat: useless output for raw events with new event parser

Peter,

I will try to experiment with: cpu/event=INST_RETIRED:ANY:c=1/
But for now with libpfm4 as it is. Then will try to come up with an
external file format that encapsulates what I already have in the
C-table. There is more than just what the hardware exports. You
have to encode certain constraints, e.g., how umasks can be
combined. I don't even use the same format for all arch. On
X86 the AMD and Intel formats are different.


On Mon, Apr 23, 2012 at 12:45 PM, Stephane Eranian <eranian@...gle.com> 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.
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