perf scripts python: Give field dict to unhandled callback

trace_unhandled() callback does not allow to access event fields, this patch
resolves the problem.

It can also been used as a more pythonic and flexible way for script writters
to demux event types

This will for example greatly simplify pytimechart event demux.

Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Tom Zanussi <tzanussi@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>,
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <1275340329-2397-1-git-send-email-tardyp@gmail.com>
Signed-off-by: Pierre Tardy <tardyp@gmail.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/scripts/python/check-perf-trace.py b/tools/perf/scripts/python/check-perf-trace.py
index 964d934395ff67d57b65a17660400bff8a1483e2..d9f7893e315c0d5aa064df04a8cc3ac870aebdad 100644 (file)
--- a/tools/perf/scripts/python/check-perf-trace.py
+++ b/tools/perf/scripts/python/check-perf-trace.py
@@ -51,8 +51,7 @@ def kmem__kmalloc(event_name, context, common_cpu,
 
                flag_str("kmem__kmalloc", "gfp_flags", gfp_flags)),
 
-def trace_unhandled(event_name, context, common_cpu, common_secs, common_nsecs,
-               common_pid, common_comm):
+def trace_unhandled(event_name, context, event_fields_dict):
     try:
         unhandled[event_name] += 1
     except TypeError:

diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
index 81f39cab3aaa5981b60d38e7402e21d5a359e3b2..33a632523743deff80cb9e3636bd9144b84b2f76 100644 (file)
--- a/tools/perf/util/scripting-engines/trace-event-python.c
+++ b/tools/perf/util/scripting-engines/trace-event-python.c
@@ -208,7 +208,7 @@ static void python_process_event(int cpu, void *data,
                                 int size __unused,
                                 unsigned long long nsecs, char *comm)
 {
-       PyObject *handler, *retval, *context, *t, *obj;
+       PyObject *handler, *retval, *context, *t, *obj, *dict = NULL;
        static char handler_name[256];
        struct format_field *field;
        unsigned long long val;
@@ -232,6 +232,14 @@ static void python_process_event(int cpu, void *data,
 
        sprintf(handler_name, "%s__%s", event->system, event->name);
 
+       handler = PyDict_GetItemString(main_dict, handler_name);
+       if (handler && !PyCallable_Check(handler))
+               handler = NULL;
+       if (!handler) {
+               dict = PyDict_New();
+               if (!dict)
+                       Py_FatalError("couldn't create Python dict");
+       }
        s = nsecs / NSECS_PER_SEC;
        ns = nsecs - s * NSECS_PER_SEC;
 
@@ -242,12 +250,20 @@ static void python_process_event(int cpu, void *data,
        PyTuple_SetItem(t, n++, PyString_FromString(handler_name));
        PyTuple_SetItem(t, n++,
                        PyCObject_FromVoidPtr(scripting_context, NULL));
-       PyTuple_SetItem(t, n++, PyInt_FromLong(cpu));
-       PyTuple_SetItem(t, n++, PyInt_FromLong(s));
-       PyTuple_SetItem(t, n++, PyInt_FromLong(ns));
-       PyTuple_SetItem(t, n++, PyInt_FromLong(pid));
-       PyTuple_SetItem(t, n++, PyString_FromString(comm));
 
+       if (handler) {
+               PyTuple_SetItem(t, n++, PyInt_FromLong(cpu));
+               PyTuple_SetItem(t, n++, PyInt_FromLong(s));
+               PyTuple_SetItem(t, n++, PyInt_FromLong(ns));
+               PyTuple_SetItem(t, n++, PyInt_FromLong(pid));
+               PyTuple_SetItem(t, n++, PyString_FromString(comm));
+       } else {
+               PyDict_SetItemString(dict, "common_cpu", PyInt_FromLong(cpu));
+               PyDict_SetItemString(dict, "common_s", PyInt_FromLong(s));
+               PyDict_SetItemString(dict, "common_ns", PyInt_FromLong(ns));
+               PyDict_SetItemString(dict, "common_pid", PyInt_FromLong(pid));
+               PyDict_SetItemString(dict, "common_comm", PyString_FromString(comm));
+       }
        for (field = event->format.fields; field; field = field->next) {
                if (field->flags & FIELD_IS_STRING) {
                        int offset;
@@ -272,27 +288,31 @@ static void python_process_event(int cpu, void *data,
                                        obj = PyLong_FromUnsignedLongLong(val);
                        }
                }
-               PyTuple_SetItem(t, n++, obj);
+               if (handler)
+                       PyTuple_SetItem(t, n++, obj);
+               else
+                       PyDict_SetItemString(dict, field->name, obj);
+
        }
+       if (!handler)
+               PyTuple_SetItem(t, n++, dict);
 
        if (_PyTuple_Resize(&t, n) == -1)
                Py_FatalError("error resizing Python tuple");
 
-       handler = PyDict_GetItemString(main_dict, handler_name);
-       if (handler && PyCallable_Check(handler)) {
+       if (handler) {
                retval = PyObject_CallObject(handler, t);
                if (retval == NULL)
                        handler_call_die(handler_name);
        } else {
                handler = PyDict_GetItemString(main_dict, "trace_unhandled");
                if (handler && PyCallable_Check(handler)) {
-                       if (_PyTuple_Resize(&t, N_COMMON_FIELDS) == -1)
-                               Py_FatalError("error resizing Python tuple");
 
                        retval = PyObject_CallObject(handler, t);
                        if (retval == NULL)
                                handler_call_die("trace_unhandled");
                }
+               Py_DECREF(dict);
        }
 
        Py_DECREF(t);
@@ -548,12 +568,10 @@ static int python_generate_script(const char *outfile)
        }
 
        fprintf(ofp, "def trace_unhandled(event_name, context, "
-               "common_cpu, common_secs, common_nsecs,\n\t\t"
-               "common_pid, common_comm):\n");
+               "event_fields_dict):\n");
 
-       fprintf(ofp, "\t\tprint_header(event_name, common_cpu, "
-               "common_secs, common_nsecs,\n\t\tcommon_pid, "
-               "common_comm)\n\n");
+       fprintf(ofp, "\t\tprint ' '.join(['%%s=%%s'%%(k,str(v))"
+               "for k,v in sorted(event_fields_dict.items())])\n\n");
 
        fprintf(ofp, "def print_header("
                "event_name, cpu, secs, nsecs, pid, comm):\n"