linux-kernel - [tip:perf/core] perf script: Allow printing period for non freq mode groups

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Date:   Sat, 18 Nov 2017 00:29:11 -0800
From:   tip-bot for Andi Kleen <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, acme@...hat.com, tglx@...utronix.de,
        hpa@...or.com, mingo@...nel.org, ak@...ux.intel.com,
        jolsa@...nel.org
Subject: [tip:perf/core] perf script: Allow printing period for non freq
 mode groups

Commit-ID:  5039c8a28fa97b8dce7b363a5ecd4bee2b87bf03
Gitweb:     https://git.kernel.org/tip/5039c8a28fa97b8dce7b363a5ecd4bee2b87bf03
Author:     Andi Kleen <ak@...ux.intel.com>
AuthorDate: Thu, 9 Nov 2017 06:55:26 -0800
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 16 Nov 2017 14:49:55 -0300

perf script: Allow printing period for non freq mode groups

When using leader sampling the values of the not sampled but counted
events are shown by perf script in "period".

Currently printing period is only allowed when the main event has a
period, that is it is in frequency mode.

This implies that we cannot dump the values of counted events when the
leader event is not in frequency mode.

Just remove the check that the period must be set on all events. It will
just be printed as 0 instead if it's not available.

This fixes the following:

  $ perf record -c 100000 -e '{cycles,branches}:S'
  $ perf script -F event,period

Further commentary by Jiri Olsa:

The period will be the value of configured period, not 0:

int perf_evsel__parse_sample(struct ...
  ...
  data->period = evsel->attr.sample_period;

  $ perf record -c 100000
  $ perf script -F event,period | head -3
  Failed to open /tmp/perf-2048.map, continuing without symbols
      100000 cycles:ppp:
      100000 cycles:ppp:

other than that I think we can remove that check, because we will have
always sane number in period

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
Acked-by: Jiri Olsa <jolsa@...nel.org>
Link: http://lkml.kernel.org/r/20171109145528.23371-4-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-script.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 9b43bda..ee7c7aa 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -423,11 +423,6 @@ static int perf_evsel__check_attr(struct perf_evsel *evsel,
 					   PERF_OUTPUT_CPU, allow_user_set))
 		return -EINVAL;
 
-	if (PRINT_FIELD(PERIOD) &&
-		perf_evsel__check_stype(evsel, PERF_SAMPLE_PERIOD, "PERIOD",
-					PERF_OUTPUT_PERIOD))
-		return -EINVAL;
-
 	if (PRINT_FIELD(IREGS) &&
 		perf_evsel__check_stype(evsel, PERF_SAMPLE_REGS_INTR, "IREGS",
 					PERF_OUTPUT_IREGS))