[tip:perfcounters/core] perf record: Fix the profiling of existing pid or whole box

[tip-bot for Mike Galbraith]

Commit-ID:  ef65b2a0b3a2f82850144df6e6a7796f6d66da6b
Gitweb:     http://git.kernel.org/tip/ef65b2a0b3a2f82850144df6e6a7796f6d66da6b
Author:     Mike Galbraith <efault@xxxxxx>
AuthorDate: Wed, 27 May 2009 10:10:51 +0200
Committer:  Ingo Molnar <mingo@xxxxxxx>
CommitDate: Wed, 27 May 2009 12:31:03 +0200

perf record: Fix the profiling of existing pid or whole box

Perf record bails if no command argument is provided, so you can't use
naked -a or -p to profile a running task or the whole box.

Allow foreground profiling of an existing pid or the entire system.

[ Impact: fix command option handling bug ]

Signed-off-by: Mike Galbraith <efault@xxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Corey Ashford <cjashfor@xxxxxxxxxxxxxxxxxx>
Cc: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: John Kacur <jkacur@xxxxxxxxxx>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>


---
 Documentation/perf_counter/builtin-record.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/perf_counter/builtin-record.c b/Documentation/perf_counter/builtin-record.c
index 431077a..4a06866 100644
--- a/Documentation/perf_counter/builtin-record.c
+++ b/Documentation/perf_counter/builtin-record.c
@@ -354,7 +354,7 @@ static int __cmd_record(int argc, const char **argv)
 	signal(SIGCHLD, sig_handler);
 	signal(SIGINT, sig_handler);
 
-	if (target_pid == -1) {
+	if (target_pid == -1 && argc) {
 		pid = fork();
 		if (pid < 0)
 			perror("failed to fork");
@@ -430,7 +430,7 @@ int cmd_record(int argc, const char **argv, const char *prefix)
 	create_events_help(events_help_msg);
 
 	argc = parse_options(argc, argv, options, record_usage, 0);
-	if (!argc)
+	if (!argc && target_pid == -1 && !system_wide)
 		usage_with_options(record_usage, options);
 
 	if (!nr_counters) {
--
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