linux-kernel - [PATCH 4/5] perf record: Delay setting the header writing atexit call

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Message-Id: <1297975291-12792-5-git-send-email-acme@infradead.org>
Date:	Thu, 17 Feb 2011 18:41:30 -0200
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>, Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	Tom Zanussi <tzanussi@...il.com>
Subject: [PATCH 4/5] perf record: Delay setting the header writing atexit call

From: Arnaldo Carvalho de Melo <acme@...hat.com>

While testing the --filter option I noticed that we were writing lots of
unneeded stuff to the perf.data header when the filter ioctl fails, so
move the atexit(atexit_header) call to after we create the counters
successfully.

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/builtin-record.c |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index a4aaadc..db4cd1e 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -538,11 +538,6 @@ static int __cmd_record(int argc, const char **argv)
 	if (have_tracepoints(&evsel_list->entries))
 		perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
 
-	/*
- 	 * perf_session__delete(session) will be called at atexit_header()
-	 */
-	atexit(atexit_header);
-
 	if (forks) {
 		child_pid = fork();
 		if (child_pid < 0) {
@@ -601,6 +596,11 @@ static int __cmd_record(int argc, const char **argv)
 
 	perf_session__set_sample_type(session, sample_type);
 
+	/*
+	 * perf_session__delete(session) will be called at atexit_header()
+	 */
+	atexit(atexit_header);
+
 	if (pipe_output) {
 		err = perf_header__write_pipe(output);
 		if (err < 0)
-- 
1.6.2.5

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