linux-kernel - [PATCH 1/1] perf record: We should fork only if a program was specified to run

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Date:	Fri, 18 Dec 2009 18:42:24 -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>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>
Subject: [PATCH 1/1] perf record: We should fork only if a program was specified to run

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

IOW: Now 'perf record -a' works, this was a bug introduced in:

856e96608a72412d319e498a3a7c557571f811bd
"perf record: Properly synchronize child creation"

Reported-by: Pekka Enberg <penberg@...helsinki.fi>
Cc: Frédéric Weisbecker <fweisbec@...il.com>
Cc: Mike Galbraith <efault@....de>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Paul Mackerras <paulus@...ba.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-record.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 63136d0..90eedd9 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -402,7 +402,7 @@ static void atexit_header(void)
 	perf_header__write(&session->header, output, true);
 }
 
-static int __cmd_record(int argc __used, const char **argv)
+static int __cmd_record(int argc, const char **argv)
 {
 	int i, counter;
 	struct stat st;
@@ -422,7 +422,8 @@ static int __cmd_record(int argc __used, const char **argv)
 	signal(SIGCHLD, sig_handler);
 	signal(SIGINT, sig_handler);
 
-	if (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0) {
+	if (target_pid == -1 && argc > 0 &&
+	    (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
 		perror("failed to create pipes");
 		exit(-1);
 	}
@@ -483,7 +484,7 @@ static int __cmd_record(int argc __used, const char **argv)
 
 	atexit(atexit_header);
 
-	if (target_pid == -1) {
+	if (target_pid == -1 && argc > 0) {
 		pid = fork();
 		if (pid < 0) {
 			perror("failed to fork");
@@ -667,7 +668,7 @@ int cmd_record(int argc, const char **argv, const char *prefix __used)
 
 	argc = parse_options(argc, argv, options, record_usage,
 			    PARSE_OPT_STOP_AT_NON_OPTION);
-	if (!argc && target_pid == -1 && (!system_wide || profile_cpu == -1))
+	if (!argc && target_pid == -1 && !system_wide)
 		usage_with_options(record_usage, options);
 
 	symbol__init();
-- 
1.6.2.5

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