tracing: add format file to describe event struct fields
[linux-2.6.git] / kernel / trace / trace_events_stage_2.h
index dc79fe3..3a80ea4 100644 (file)
@@ -74,3 +74,55 @@ ftrace_raw_output_##call(struct trace_iterator *iter, int flags)     \
 }
 
 #include <trace/trace_event_types.h>
+
+/*
+ * Setup the showing format of trace point.
+ *
+ * int
+ * ftrace_format_##call(struct trace_seq *s)
+ * {
+ *     struct ftrace_raw_##call field;
+ *     int ret;
+ *
+ *     ret = trace_seq_printf(s, #type " " #item ";"
+ *                            " size:%d; offset:%d;\n",
+ *                            sizeof(field.type),
+ *                            offsetof(struct ftrace_raw_##call,
+ *                                     item));
+ *
+ * }
+ */
+
+#undef TRACE_FIELD
+#define TRACE_FIELD(type, item, assign)                                        \
+       ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t"      \
+                              "offset:%lu;\tsize:%lu;\n",              \
+                              offsetof(typeof(field), item),           \
+                              sizeof(field.item));                     \
+       if (!ret)                                                       \
+               return 0;
+
+
+#undef TRACE_FIELD_SPECIAL
+#define TRACE_FIELD_SPECIAL(type_item, item, cmd)                      \
+       ret = trace_seq_printf(s, "\tfield special:" #type_item ";\t"   \
+                              "offset:%lu;\tsize:%lu;\n",              \
+                              offsetof(typeof(field), item),           \
+                              sizeof(field.item));                     \
+       if (!ret)                                                       \
+               return 0;
+
+#undef TRACE_EVENT_FORMAT
+#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)     \
+int                                                                    \
+ftrace_format_##call(struct trace_seq *s)                              \
+{                                                                      \
+       struct ftrace_raw_##call field;                                 \
+       int ret;                                                        \
+                                                                       \
+       tstruct;                                                        \
+                                                                       \
+       return ret;                                                     \
+}
+
+#include <trace/trace_event_types.h>