linux-kernel - [tip:perfcounters/urgent] perf tools: Fix multi-counter stat bug caused by incorrect reading of perf.data file header

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Message-ID: <tip-ce71e78d91c4e7c02ce85f26319e53a824be4ffb@git.kernel.org>
Date:	Fri, 7 Aug 2009 07:39:49 GMT
From:	tip-bot for Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Brice.Goglin@...ia.fr, hpa@...or.com,
	mingo@...hat.com, a.p.zijlstra@...llo.nl, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:perfcounters/urgent] perf tools: Fix multi-counter stat bug caused by incorrect reading of perf.data file header

Commit-ID:  ce71e78d91c4e7c02ce85f26319e53a824be4ffb
Gitweb:     http://git.kernel.org/tip/ce71e78d91c4e7c02ce85f26319e53a824be4ffb
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Thu, 6 Aug 2009 20:57:41 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 7 Aug 2009 09:37:29 +0200

perf tools: Fix multi-counter stat bug caused by incorrect reading of perf.data file header

Brice Goglin reported that only the first result from a
multi-counter perf record --stat run is accurate, the
rest looks bogus.

A silly mistake made us re-read the first attribute for
every recorded attribute.

Reported-by: Brice Goglin <Brice.Goglin@...ia.fr>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Tested-by: Brice Goglin <Brice.Goglin@...ia.fr>
Cc: paulus@...ba.org
LKML-Reference: <1249585061.4975.17.camel@...top>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 tools/perf/util/header.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 450384b..95a44bc 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -213,9 +213,10 @@ struct perf_header *perf_header__read(int fd)
 
 	for (i = 0; i < nr_attrs; i++) {
 		struct perf_header_attr *attr;
-		off_t tmp = lseek(fd, 0, SEEK_CUR);
+		off_t tmp;
 
 		do_read(fd, &f_attr, sizeof(f_attr));
+		tmp = lseek(fd, 0, SEEK_CUR);
 
 		attr = perf_header_attr__new(&f_attr.attr);
 
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