linux-kernel - [tip:perf/urgent] perf stat: Fix aggreate counter reading accounting

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Message-ID: <tip-52bcd9947bffae88bb1758f19277d678aaebc2ec@git.kernel.org>
Date:	Thu, 3 Feb 2011 21:10:02 GMT
From:	tip-bot for Arnaldo Carvalho de Melo <acme@...hat.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, eranian@...gle.com, paulus@...ba.org,
	acme@...hat.com, hpa@...or.com, mingo@...hat.com,
	tzanussi@...il.com, peterz@...radead.org, efault@....de,
	fweisbec@...il.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perf/urgent] perf stat: Fix aggreate counter reading accounting

Commit-ID:  52bcd9947bffae88bb1758f19277d678aaebc2ec
Gitweb:     http://git.kernel.org/tip/52bcd9947bffae88bb1758f19277d678aaebc2ec
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Thu, 3 Feb 2011 17:26:06 -0200
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 3 Feb 2011 17:26:06 -0200

perf stat: Fix aggreate counter reading accounting

Introduced in: c52b12ed, when this sequence:

  count[0] = count[1] = count[2] = 0;

Was replaced with:

  aggr->val = 0;

Which is equivalent to zeroing just the first entry in the 'count'
array.

Fix it by zeroing the three entries with:

  aggr->val = aggr->ena = aggr->run = 0;

Reported-by: Ingo Molnar <mingo@...e.hu>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Mike Galbraith <efault@....de>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Tom Zanussi <tzanussi@...il.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/evsel.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index f5cfed6..d8575d3 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -90,7 +90,7 @@ int __perf_evsel__read(struct perf_evsel *evsel,
 	int cpu, thread;
 	struct perf_counts_values *aggr = &evsel->counts->aggr, count;
 
-	aggr->val = 0;
+	aggr->val = aggr->ena = aggr->run = 0;
 
 	for (cpu = 0; cpu < ncpus; cpu++) {
 		for (thread = 0; thread < nthreads; thread++) {
--
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