linux-kernel - [tip:perf/urgent] perf evsel: Fix period/freq terms setup

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Message-ID: <tip-49c0ae80eb32426fa133246200628e529067c595@git.kernel.org>
Date:   Mon, 5 Feb 2018 13:35:59 -0800
From:   tip-bot for Jiri Olsa <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, namhyung@...nel.org,
        linux-kernel@...r.kernel.org, alexander.shishkin@...ux.intel.com,
        peterz@...radead.org, dsahern@...il.com, hpa@...or.com,
        jolsa@...nel.org, eranian@...gle.com, acme@...hat.com,
        ak@...ux.intel.com, tglx@...utronix.de
Subject: [tip:perf/urgent] perf evsel: Fix period/freq terms setup

Commit-ID:  49c0ae80eb32426fa133246200628e529067c595
Gitweb:     https://git.kernel.org/tip/49c0ae80eb32426fa133246200628e529067c595
Author:     Jiri Olsa <jolsa@...nel.org>
AuthorDate: Thu, 1 Feb 2018 09:38:10 +0100
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 5 Feb 2018 12:11:58 -0300

perf evsel: Fix period/freq terms setup

Stephane reported that we don't set properly PERIOD sample type for
events with period term defined.

Before:
  $ perf record -e cpu/cpu-cycles,period=1000/u ls
  $ perf evlist -v
  cpu/cpu-cycles,period=1000/u: ... sample_type: IP|TID|TIME|PERIOD, ...

After:
  $ perf record -e cpu/cpu-cycles,period=1000/u ls
  $ perf evlist -v
  cpu/cpu-cycles,period=1000/u: ... sample_type: IP|TID|TIME, ...

Setting PERIOD sample type based on period term setup.

Committer note:

When we use -c or a period=N term in the event definition, then we don't
need to ask the kernel, for this event, via perf_event_attr.sample_type
|= PERF_SAMPLE_PERIOD, to put the event period in each sample for this
event, as we know it already, it is in perf_event_attr.sample_period.

Reported-by: Stephane Eranian <eranian@...gle.com>
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Tested-by: Stephane Eranian <eranian@...gle.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/20180201083812.11359-2-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/evsel.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 66fa451..f2f2eaa 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -745,12 +745,14 @@ static void apply_config_terms(struct perf_evsel *evsel,
 			if (!(term->weak && opts->user_interval != ULLONG_MAX)) {
 				attr->sample_period = term->val.period;
 				attr->freq = 0;
+				perf_evsel__reset_sample_bit(evsel, PERIOD);
 			}
 			break;
 		case PERF_EVSEL__CONFIG_TERM_FREQ:
 			if (!(term->weak && opts->user_freq != UINT_MAX)) {
 				attr->sample_freq = term->val.freq;
 				attr->freq = 1;
+				perf_evsel__set_sample_bit(evsel, PERIOD);
 			}
 			break;
 		case PERF_EVSEL__CONFIG_TERM_TIME: