linux-kernel - [tip:perfcounters/core] perf trace: Fix parsing of perf.data

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Date:	Thu, 3 Sep 2009 14:27:37 GMT
From:	tip-bot for Ingo Molnar <mingo@...e.hu>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com, paulus@...ba.org,
	hpa@...or.com, mingo@...hat.com, a.p.zijlstra@...llo.nl,
	efault@....de, fweisbec@...il.com, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:perfcounters/core] perf trace: Fix parsing of perf.data

Commit-ID:  8886f42d6d8dabeb488c706c339634a0e3e08df4
Gitweb:     http://git.kernel.org/tip/8886f42d6d8dabeb488c706c339634a0e3e08df4
Author:     Ingo Molnar <mingo@...e.hu>
AuthorDate: Thu, 3 Sep 2009 16:19:57 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Thu, 3 Sep 2009 16:19:57 +0200

perf trace: Fix parsing of perf.data

We started parsing perf.data at head 0. This caused -D to
segfault and it could possibly also case incorrect trace
entries to be displayed.

Parse it at data_offset instead.

Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Mike Galbraith <efault@....de>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 tools/perf/builtin-trace.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index d59bf8a..914ab36 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -196,6 +196,7 @@ static int __cmd_trace(void)
 		exit(0);
 	}
 	header = perf_header__read(input);
+	head = header->data_offset;
 	sample_type = perf_header__sample_type(header);
 
 	if (!(sample_type & PERF_SAMPLE_RAW))
--
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