linux-kernel - Re: [PATCH 5/5] perf record: Add -a as a default target

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Date:   Fri, 17 Feb 2017 18:00:18 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, David Ahern <dsahern@...il.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH 5/5] perf record: Add -a as a default target

On Fri, Feb 17, 2017 at 11:28:14AM -0300, Arnaldo Carvalho de Melo wrote:
> Em Fri, Feb 17, 2017 at 03:00:58PM +0100, Jiri Olsa escreveu:
> > Adding system wide (-a) option as a default target
> > if non is specified.
> > 
> >   # perf record
> >   Warning: No target specified, setting system-wide collection (-a).
> 
> Ditto, this warning will get annoying after a while...

ok, posting the change with no warning

jirka

---
Adding system wide (-a) option as a default target
if non is specified.

Running 'perf record' will now collect system wide data.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Cc: David Ahern <dsahern@...il.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/n/tip-tq11of2qlz8kxpxzva05d54l@git.kernel.org
---
 tools/perf/Documentation/perf-record.txt | 2 +-
 tools/perf/builtin-record.c              | 4 +++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index 27256bc68eda..b16003ec14a7 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -157,7 +157,7 @@ OPTIONS
 
 -a::
 --all-cpus::
-        System-wide collection from all CPUs.
+        System-wide collection from all CPUs (default if no target is specified).
 
 -p::
 --pid=::
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 6cd6776052e7..b87bbef73394 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1677,8 +1677,10 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
 
 	argc = parse_options(argc, argv, record_options, record_usage,
 			    PARSE_OPT_STOP_AT_NON_OPTION);
+
+	/* Make system wide (-a) the default target. */
 	if (!argc && target__none(&rec->opts.target))
-		usage_with_options(record_usage, record_options);
+		rec->opts.target.system_wide = true;
 
 	if (nr_cgroups && !rec->opts.target.system_wide) {
 		usage_with_options_msg(record_usage, record_options,
-- 
2.7.4