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perf record: Add -a as default target

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Running 'perf record' with no target (-a, -p, -t, etc) will now collect
system wide data.

Commiter notes:

Testing it:

  [root@jouet ~]# perf record
  ^C[ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 1.351 MB perf.data (366 samples) ]
  #

is equivalent to:

  # perf record -a
  ^C[ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 1.411 MB perf.data (978 samples) ]
  #

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20170217170018.GA15389@krava
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2017-02-17 18:00:18 +01:00 committed by Arnaldo Carvalho de Melo
parent 0d79f8b931
commit 483635a9d0
2 changed files with 4 additions and 2 deletions
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2
tools/perf/Documentation/perf-record.txt
View file

@ -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=::

4
tools/perf/builtin-record.c
View file

@ -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,