perf script: Handle the num array type in python properly

The raw_syscalls:sys_enter tracer for instance passes has one argument
named 'arg' which is an array of 6 integers. Right the python scripts
gets only 0 passed as an argument. The reason is that
pevent_read_number() can not handle data types of 48 and returns always
0.
This patch changes this by passing num array as list of nums which fit
the description. As a result python will now see a list named arg which
contains 6 (integer) items.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/n/1401207274-8170-2-git-send-email-bigeasy@linutronix.deSigned-off-by: Jiri Olsa <jolsa@kernel.org>

tools/perf/util/scripting-engines/trace-event-python.c

@@ -234,10 +234,24 @@ static inline struct event_format *find_cache_event(struct perf_evsel *evsel)
 static PyObject *get_field_numeric_entry(struct event_format *event,
 		struct format_field *field, void *data)
 {
-	PyObject *obj;
+	bool is_array = field->flags & FIELD_IS_ARRAY;
+	PyObject *obj, *list = NULL;
 	unsigned long long val;
+	unsigned int item_size, n_items, i;
 
-	val = read_size(event, data + field->offset, field->size);
+	if (is_array) {
+		list = PyList_New(field->arraylen);
+		item_size = field->size / field->arraylen;
+		n_items = field->arraylen;
+	} else {
+		item_size = field->size;
+		n_items = 1;
+	}
+
+	for (i = 0; i < n_items; i++) {
+
+		val = read_size(event, data + field->offset + i * item_size,
+				item_size);
 		if (field->flags & FIELD_IS_SIGNED) {
 			if ((long long)val >= LONG_MIN &&
 					(long long)val <= LONG_MAX)
@@ -250,6 +264,11 @@ static PyObject *get_field_numeric_entry(struct event_format *event,
 			else
 				obj = PyLong_FromUnsignedLongLong(val);
 		}
+		if (is_array)
+			PyList_SET_ITEM(list, i, obj);
+	}
+	if (is_array)
+		obj = list;
 	return obj;
 }