linux-kernel - [tip:perf/core] perf stat: Don't merge events in the same PMU

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Message-ID: <tip-6c5f4e5cb35b4694dc035d91092d23f596ecd06a@git.kernel.org>
Date:   Wed, 3 Jul 2019 07:28:32 -0700
From:   tip-bot for Andi Kleen <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     acme@...hat.com, tglx@...utronix.de, ak@...ux.intel.com,
        mingo@...nel.org, jolsa@...nel.org, kan.liang@...ux.intel.com,
        hpa@...or.com, linux-kernel@...r.kernel.org
Subject: [tip:perf/core] perf stat: Don't merge events in the same PMU

Commit-ID:  6c5f4e5cb35b4694dc035d91092d23f596ecd06a
Gitweb:     https://git.kernel.org/tip/6c5f4e5cb35b4694dc035d91092d23f596ecd06a
Author:     Andi Kleen <ak@...ux.intel.com>
AuthorDate: Mon, 24 Jun 2019 12:37:09 -0700
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 1 Jul 2019 22:50:41 -0300

perf stat: Don't merge events in the same PMU

Event merging is mainly to collapse similar events in lots of different
duplicated PMUs.

It can break metric displaying. It's possible for two metrics to have
the same event, and when the two events happen in a row the second
wouldn't be displayed.  This would also not show the second metric.

To avoid this don't merge events in the same PMU. This makes sense, if
we have multiple events in the same PMU there is likely some reason for
it (e.g. using multiple groups) and we better not merge them.

While in theory it would be possible to construct metrics that have
events with the same name in different PMU no current metrics have this
problem.

This is the fix for perf stat -M UPI,IPC (needs also another bug fix to
completely work)

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
Acked-by: Jiri Olsa <jolsa@...nel.org>
Cc: Kan Liang <kan.liang@...ux.intel.com>
Fixes: 430daf2dc7af ("perf stat: Collapse identically named events")
Link: http://lkml.kernel.org/r/20190624193711.35241-3-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/stat-display.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
index 90df41169113..58df6a0dbb9f 100644
--- a/tools/perf/util/stat-display.c
+++ b/tools/perf/util/stat-display.c
@@ -554,7 +554,8 @@ static void collect_all_aliases(struct perf_stat_config *config, struct perf_evs
 		    alias->scale != counter->scale ||
 		    alias->cgrp != counter->cgrp ||
 		    strcmp(alias->unit, counter->unit) ||
-		    perf_evsel__is_clock(alias) != perf_evsel__is_clock(counter))
+		    perf_evsel__is_clock(alias) != perf_evsel__is_clock(counter) ||
+		    !strcmp(alias->pmu_name, counter->pmu_name))
 			break;
 		alias->merged_stat = true;
 		cb(config, alias, data, false);