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From: Stephane Eranian <eranian@google.com>
To: Jiri Olsa <jolsa@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>, Jiri Olsa <jolsa@kernel.org>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	"Liang, Kan" <kan.liang@linux.intel.com>,
	agustinv@codeaurora.org, LKML <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Namhyung Kim <namhyung@kernel.org>,
	David Ahern <dsahern@gmail.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Milian Wolff <milian.wolff@kdab.com>,
	Andi Kleen <andi@firstfloor.org>,
	frederic@kernel.org
Subject: Re: [PATCH 01/10] perf tools: Uniquify the event name if there's no other matched event
Date: Thu, 7 Jun 2018 09:09:10 -0700	[thread overview]
Message-ID: <CABPqkBRCZgPEpcc0SUvefoqAHh=-jTtBr=EgoomDCFTT54aJBg@mail.gmail.com> (raw)
In-Reply-To: <20180607062239.GA18436@krava>

On Wed, Jun 6, 2018 at 11:22 PM Jiri Olsa <jolsa@redhat.com> wrote:
>
> On Wed, Jun 06, 2018 at 04:19:02PM -0700, Andi Kleen wrote:
> > On Thu, Jun 07, 2018 at 12:15:04AM +0200, Jiri Olsa wrote:
> > > Currently by default we try to match the user specified PMU
> > > name to all PMU units available and use them to aggregate
> > > all matched PMUs event counts into one 'pattern' event.
> > >
> > > While this is useful for uncore events, it screws up names
> > > for other events, where this is not desirable, like:
> > >
> > > Before:
> > >   # perf stat -e cp/cpu-cycles/ kill
> >
> > I assume you mean cpU/cpu-cycles/
> > >
> > >    Performance counter stats for 'kill':
> > >
> > >            1,573,757      cp/cpu-cycles/
> > >
> > > Keeping the pattern matching logic, but making the name unique
> > > in case there's no other match found. That fixes the example
> > > above and hopefully does not screw up anything else.
> > >
And the problem I have with this approach, is that you do not really
know what you are measuring.
You have not way of knowing that the count comes from multiple PMU instances:

perf stat -a -e uncore_cb/clockticks/ kill
0 uncore_cb/clockticks/

I think you need to report that this is aggregated from uncore_cbox_0
and uncore_cbox_1.
Otherwise it is not clear what I am monitoring. And you hope that what
you match in the regex
is related.
In my example should say:
0 uncore_cbox[0-1]/clockticks/

then it is clear what happened.

> > > After:
> > >   # perf stat -e cp/cpu-cycles/ kill
> > >
> > >    Performance counter stats for 'kill':
> > >
> > >            1,573,757      cpu/cpu-cycles/
> >
> >
> > The output is 100% identical?
>
> nope, the U is actualy missing.. that's the thing, the patern
> matching allows you to put 'cp' instead of 'cpu' and the final
> output is screwed.. also the metrics won't match the proper event
>
> jirka

  reply	other threads:[~2018-06-07 16:09 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-06 22:15 [RFC 00/10] perf: Add cputime events/metrics Jiri Olsa
2018-06-06 22:15 ` [PATCH 01/10] perf tools: Uniquify the event name if there's no other matched event Jiri Olsa
2018-06-06 23:19   ` Andi Kleen
2018-06-07  6:22     ` Jiri Olsa
2018-06-07 16:09       ` Stephane Eranian [this message]
2018-06-08  0:06         ` Jiri Olsa
2018-06-06 22:15 ` [PATCH 02/10] perf tools: Fix error index for pmu event parser Jiri Olsa
2018-06-07 18:53   ` Arnaldo Carvalho de Melo
2018-06-14  6:21   ` [tip:perf/urgent] " tip-bot for Jiri Olsa
2018-06-06 22:15 ` [PATCH 03/10] perf stat: Add --interval-clear option Jiri Olsa
2018-06-07 18:57   ` Arnaldo Carvalho de Melo
2018-06-14  6:21   ` [tip:perf/urgent] " tip-bot for Jiri Olsa
2018-06-06 22:15 ` [PATCH 04/10] perf stat: Use only color_fprintf call in print_metric_only Jiri Olsa
2018-06-07 19:00   ` Arnaldo Carvalho de Melo
2018-06-14  6:22   ` [tip:perf/urgent] " tip-bot for Jiri Olsa
2018-06-06 22:15 ` [PATCH 05/10] perf stat: Fix metric column display Jiri Olsa
2018-06-07 19:00   ` Arnaldo Carvalho de Melo
2018-06-14  6:22   ` [tip:perf/urgent] perf stat: Fix metric column header display alignment tip-bot for Jiri Olsa
2018-06-06 22:15 ` [PATCH 06/10] perf stat: Allow to specify specific metric column len Jiri Olsa
2018-06-14  6:23   ` [tip:perf/urgent] " tip-bot for Jiri Olsa
2018-06-06 22:15 ` [PATCH 07/10] perf stat: Add event parsing error handling to add_default_attributes Jiri Olsa
2018-06-07 19:04   ` Arnaldo Carvalho de Melo
2018-06-07 19:05     ` Arnaldo Carvalho de Melo
2018-06-14  6:23   ` [tip:perf/urgent] " tip-bot for Jiri Olsa
2018-06-06 22:15 ` [PATCH 08/10] perf/cputime: Add cputime pmu Jiri Olsa
2018-06-06 22:15 ` [PATCH 09/10] perf/cputime: Don't stop idle tick if there's live cputime event Jiri Olsa
2018-06-07 15:45   ` Andi Kleen
2018-06-07 16:01     ` Stephane Eranian
2018-06-08  0:12       ` Jiri Olsa
2018-06-06 22:15 ` [PATCH 10/10] perf stat: Add cputime metric support Jiri Olsa
2018-06-06 23:10 ` [RFC 00/10] perf: Add cputime events/metrics Andi Kleen
2018-09-26 14:44   ` Milian Wolff
2018-09-26 21:48     ` Jiri Olsa

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