perf scripting: Add 'flush' callback to scripting API

In order to defer some output via the scripting API, there needs to be a
callback after session processing but before the session is deleted.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1408129739-17368-3-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

5 files changed, 33 insertions, 0 deletions

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index c1b7029884b1..02dce9295e2c 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -485,6 +485,11 @@ static int default_start_script(const char *script __maybe_unused,
         return 0;
 }
 
+static int default_flush_script(void)
+{
+        return 0;
+}
+
 static int default_stop_script(void)
 {
         return 0;
@@ -498,6 +503,7 @@ static int default_generate_script(struct pevent *pevent __maybe_unused,
 
 static struct scripting_ops default_scripting_ops = {
         .start_script           = default_start_script,
+        .flush_script           = default_flush_script,
         .stop_script            = default_stop_script,
         .process_event          = process_event,
         .generate_script        = default_generate_script,
@@ -513,6 +519,11 @@ static void setup_scripting(void)
         scripting_ops = &default_scripting_ops;
 }
 
+static int flush_scripting(void)
+{
+        return scripting_ops->flush_script();
+}
+
 static int cleanup_scripting(void)
 {
         pr_debug("\nperf script stopped\n");
@@ -1813,6 +1824,8 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
 
         err = __cmd_script(&script);
 
+        flush_scripting();
+
 out_delete:
         perf_session__delete(session);
 
diff --git a/tools/perf/util/scripting-engines/trace-event-perl.c b/tools/perf/util/scripting-engines/trace-event-perl.c
index b2dba9c0a3a1..0a01bac4ce02 100644
--- a/tools/perf/util/scripting-engines/trace-event-perl.c
+++ b/tools/perf/util/scripting-engines/trace-event-perl.c
@@ -432,6 +432,11 @@ error:
         return err;
 }
 
+static int perl_flush_script(void)
+{
+        return 0;
+}
+
 /*
  * Stop trace script
  */
@@ -633,6 +638,7 @@ static int perl_generate_script(struct pevent *pevent, const char *outfile)
 struct scripting_ops perl_scripting_ops = {
         .name = "Perl",
         .start_script = perl_start_script,
+        .flush_script = perl_flush_script,
         .stop_script = perl_stop_script,
         .process_event = perl_process_event,
         .generate_script = perl_generate_script,
diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
index 26e5f14239ed..56ba07cce549 100644
--- a/tools/perf/util/scripting-engines/trace-event-python.c
+++ b/tools/perf/util/scripting-engines/trace-event-python.c
@@ -639,6 +639,11 @@ error:
         return err;
 }
 
+static int python_flush_script(void)
+{
+        return 0;
+}
+
 /*
  * Stop trace script
  */
@@ -823,6 +828,7 @@ static int python_generate_script(struct pevent *pevent, const char *outfile)
 struct scripting_ops python_scripting_ops = {
         .name = "Python",
         .start_script = python_start_script,
+        .flush_script = python_flush_script,
         .stop_script = python_stop_script,
         .process_event = python_process_event,
         .generate_script = python_generate_script,
diff --git a/tools/perf/util/trace-event-scripting.c b/tools/perf/util/trace-event-scripting.c
index 57aaccc1692e..5c9bdd1591a9 100644
--- a/tools/perf/util/trace-event-scripting.c
+++ b/tools/perf/util/trace-event-scripting.c
@@ -30,6 +30,11 @@
 
 struct scripting_context *scripting_context;
 
+static int flush_script_unsupported(void)
+{
+        return 0;
+}
+
 static int stop_script_unsupported(void)
 {
         return 0;
@@ -74,6 +79,7 @@ static int python_generate_script_unsupported(struct pevent *pevent
 struct scripting_ops python_scripting_unsupported_ops = {
         .name = "Python",
         .start_script = python_start_script_unsupported,
+        .flush_script = flush_script_unsupported,
         .stop_script = stop_script_unsupported,
         .process_event = process_event_unsupported,
         .generate_script = python_generate_script_unsupported,
@@ -137,6 +143,7 @@ static int perl_generate_script_unsupported(struct pevent *pevent
 struct scripting_ops perl_scripting_unsupported_ops = {
         .name = "Perl",
         .start_script = perl_start_script_unsupported,
+        .flush_script = flush_script_unsupported,
         .stop_script = stop_script_unsupported,
         .process_event = process_event_unsupported,
         .generate_script = perl_generate_script_unsupported,
diff --git a/tools/perf/util/trace-event.h b/tools/perf/util/trace-event.h
index 7b6d68688327..52aaa19e1eb1 100644
--- a/tools/perf/util/trace-event.h
+++ b/tools/perf/util/trace-event.h
@@ -64,6 +64,7 @@ struct perf_session;
 struct scripting_ops {
         const char *name;
         int (*start_script) (const char *script, int argc, const char **argv);
+        int (*flush_script) (void);
         int (*stop_script) (void);
         void (*process_event) (union perf_event *event,
                                struct perf_sample *sample,