perf script: Implement option for system-wide profiling

The option is documented in man perf-script but was not yet implemented:

       -a
           Force system-wide collection. Scripts run without a
           <command> normally use -a by default, while scripts run
           with a <command> normally don't - this option allows the
           latter to be run in system-wide mode.

As with perf record you now can profile in system-wide mode for the
runtime of a given command, e.g.:

 # perf script -a syscall-counts sleep 2

Cc: Ingo Molnar <mingo@elte.hu>
Link: http://lkml.kernel.org/r/1322229925-10075-1-git-send-email-robert.richter@amd.com
Signed-off-by: Robert Richter <robert.richter@amd.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 10 insertions, 5 deletions

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index ccbfd56d7549..ea71c5e1a94f 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -24,6 +24,7 @@ static u64			nr_unordered;
 extern const struct option      record_options[];
 static bool                     no_callchain;
 static bool                     show_full_info;
+static bool                     system_wide;
 static const char               *cpu_list;
 static DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
 
@@ -1105,6 +1106,8 @@ static const struct option options[] = {
         OPT_CALLBACK('f', "fields", NULL, "str",
                      "comma separated output fields prepend with 'type:'. Valid types: hw,sw,trace,raw. Fields: comm,tid,pid,time,cpu,event,trace,ip,sym,dso,addr",
                      parse_output_fields),
+        OPT_BOOLEAN('a', "all-cpus", &system_wide,
+                     "system-wide collection from all CPUs"),
         OPT_STRING('C', "cpu", &cpu_list, "cpu", "list of cpus to profile"),
         OPT_STRING('c', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
                    "only display events for these comms"),
@@ -1134,7 +1137,6 @@ int cmd_script(int argc, const char **argv, const char *prefix __used)
         struct perf_session *session;
         char *script_path = NULL;
         const char **__argv;
-        bool system_wide;
         int i, j, err;
 
         setup_scripting();
@@ -1202,15 +1204,17 @@ int cmd_script(int argc, const char **argv, const char *prefix __used)
                 }
 
                 if (!pid) {
-                        system_wide = true;
                         j = 0;
 
                         dup2(live_pipe[1], 1);
                         close(live_pipe[0]);
 
-                        if (!is_top_script(argv[0]))
+                        if (is_top_script(argv[0])) {
+                                system_wide = true;
+                        } else if (!system_wide) {
                                 system_wide = !have_cmd(argc - rep_args,
                                                         &argv[rep_args]);
+                        }
 
                         __argv = malloc((argc + 6) * sizeof(const char *));
                         if (!__argv)
@@ -1258,10 +1262,11 @@ int cmd_script(int argc, const char **argv, const char *prefix __used)
                 script_path = rep_script_path;
 
         if (script_path) {
-                system_wide = false;
                 j = 0;
 
-                if (rec_script_path)
+                if (!rec_script_path)
+                        system_wide = false;
+                else if (!system_wide)
                         system_wide = !have_cmd(argc - 1, &argv[1]);
 
                 __argv = malloc((argc + 2) * sizeof(const char *));