From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Date: Tue, 14 Dec 2010 00:46:49 +0000 (-0500)
Subject: TRACE_EVENT: start work on type metadata declaration
X-Git-Tag: v2.0-pre1~195
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=40652b65bb2b500ea04eaa61c3dfcfaa719073be;p=lttng-modules.git

TRACE_EVENT: start work on type metadata declaration

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/probes/Makefile b/probes/Makefile
index 08508a6f..cfe5e758 100644
--- a/probes/Makefile
+++ b/probes/Makefile
@@ -6,7 +6,8 @@ ifneq ($(KERNELRELEASE),)
 ifneq ($(CONFIG_TRACEPOINTS),)
 
 ccflags-y += -I$(PWD)/probes
-obj-m += sched.o
+#obj-m += sched.o
+obj-m += lttng-types.o
 
 endif
 
diff --git a/probes/lttng-events.h b/probes/lttng-events.h
new file mode 100644
index 00000000..b0152829
--- /dev/null
+++ b/probes/lttng-events.h
@@ -0,0 +1,808 @@
+#include <lttng.h>
+
+/*
+ * Macros mapping tp_assign() to "=", tp_memcpy() to memcpy() and tp_strcpy() to
+ * strcpy().
+ */
+#define tp_assign(dest, src)						\
+	lib_ring_buffer_align_ctx(config, &ctx, sizeof(src));		\
+	lib_ring_buffer_write(config, &ctx, &src, sizeof(src));
+
+#define tp_memcpy(dest, src, len)					\
+	lib_ring_buffer_align_ctx(config, &ctx, sizeof(*(src)));	\
+	lib_ring_buffer_write(config, &ctx, &src, len);
+
+/* TODO */
+#define tp_strcpy(dest, src)		__assign_str(dest, src)
+
+/*
+ * Stage 1 of the trace events.
+ *
+ * Create event field type metadata section.
+ */
+
+/*
+ * DECLARE_EVENT_CLASS can be used to add a generic function
+ * handlers for events. That is, if all events have the same
+ * parameters and just have distinct trace points.
+ * Each tracepoint can be defined with DEFINE_EVENT and that
+ * will map the DECLARE_EVENT_CLASS to the tracepoint.
+ *
+ * TRACE_EVENT is a one to one mapping between tracepoint and template.
+ */
+#undef TRACE_EVENT
+#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
+	DECLARE_EVENT_CLASS(name,			       \
+			     PARAMS(proto),		       \
+			     PARAMS(args),		       \
+			     PARAMS(tstruct),		       \
+			     PARAMS(assign),		       \
+			     PARAMS(print));		       \
+	DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
+
+/* Field types must be defined in lttng-types.h */
+
+#undef __field
+#define __field(type, item)		type	item;
+
+#undef __field_ext
+#define __field_ext(type, item, filter_type)	type	item;
+
+#undef __array
+#define __array(type, item, len)				\
+	type { parent = array; length = len; elem_type = type; } item;
+
+/* TODO */
+
+#undef __dynamic_array
+#define __dynamic_array(type, item, len) u32 __data_loc_##item;
+
+#undef __string
+#define __string(item, src) __dynamic_array(char, item, -1)
+
+#undef TP_STRUCT__entry
+#define TP_STRUCT__entry(args...) args
+
+#undef DECLARE_EVENT_CLASS
+#define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)	\
+	struct ftrace_raw_##name {					\
+		struct trace_entry	ent;				\
+		tstruct							\
+		char			__data[0];			\
+	};								\
+									\
+	static struct ftrace_event_class event_class_##name;
+
+#undef DEFINE_EVENT
+#define DEFINE_EVENT(template, name, proto, args)	\
+	static struct ftrace_event_call	__used		\
+	__attribute__((__aligned__(4))) event_##name
+
+#undef DEFINE_EVENT_PRINT
+#define DEFINE_EVENT_PRINT(template, name, proto, args, print)	\
+	DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
+
+/* Callbacks are meaningless to ftrace. */
+#undef TRACE_EVENT_FN
+#define TRACE_EVENT_FN(name, proto, args, tstruct,			\
+		assign, print, reg, unreg)				\
+	TRACE_EVENT(name, PARAMS(proto), PARAMS(args),			\
+		PARAMS(tstruct), PARAMS(assign), PARAMS(print))		\
+
+
+
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+/*
+ * Stage 2 of the trace events.
+ *
+ * Create static inline function that calculates event size.
+ */
+
+
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+/*
+ * Stage 3 of the trace events.
+ *
+ * Create the probe function : call even size calculation and write event data
+ * into the buffer.
+ */
+
+
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+
+
+
+#include <linux/ftrace_event.h>
+
+/*
+ * DECLARE_EVENT_CLASS can be used to add a generic function
+ * handlers for events. That is, if all events have the same
+ * parameters and just have distinct trace points.
+ * Each tracepoint can be defined with DEFINE_EVENT and that
+ * will map the DECLARE_EVENT_CLASS to the tracepoint.
+ *
+ * TRACE_EVENT is a one to one mapping between tracepoint and template.
+ */
+#undef TRACE_EVENT
+#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
+	DECLARE_EVENT_CLASS(name,			       \
+			     PARAMS(proto),		       \
+			     PARAMS(args),		       \
+			     PARAMS(tstruct),		       \
+			     PARAMS(assign),		       \
+			     PARAMS(print));		       \
+	DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
+
+
+#undef __field
+#define __field(type, item)		type	item;
+
+#undef __field_ext
+#define __field_ext(type, item, filter_type)	type	item;
+
+#undef __array
+#define __array(type, item, len)	type	item[len];
+
+#undef __dynamic_array
+#define __dynamic_array(type, item, len) u32 __data_loc_##item;
+
+#undef __string
+#define __string(item, src) __dynamic_array(char, item, -1)
+
+#undef TP_STRUCT__entry
+#define TP_STRUCT__entry(args...) args
+
+#undef DECLARE_EVENT_CLASS
+#define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)	\
+	struct ftrace_raw_##name {					\
+		struct trace_entry	ent;				\
+		tstruct							\
+		char			__data[0];			\
+	};								\
+									\
+	static struct ftrace_event_class event_class_##name;
+
+#undef DEFINE_EVENT
+#define DEFINE_EVENT(template, name, proto, args)	\
+	static struct ftrace_event_call	__used		\
+	__attribute__((__aligned__(4))) event_##name
+
+#undef DEFINE_EVENT_PRINT
+#define DEFINE_EVENT_PRINT(template, name, proto, args, print)	\
+	DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
+
+/* Callbacks are meaningless to ftrace. */
+#undef TRACE_EVENT_FN
+#define TRACE_EVENT_FN(name, proto, args, tstruct,			\
+		assign, print, reg, unreg)				\
+	TRACE_EVENT(name, PARAMS(proto), PARAMS(args),			\
+		PARAMS(tstruct), PARAMS(assign), PARAMS(print))		\
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+
+/*
+ * Stage 2 of the trace events.
+ *
+ * Create static inline function that calculates event size.
+ */
+
+#undef __field
+#define __field(type, item)
+
+#undef __field_ext
+#define __field_ext(type, item, filter_type)
+
+#undef __array
+#define __array(type, item, len)
+
+#undef __dynamic_array
+#define __dynamic_array(type, item, len)	u32 item;
+
+#undef __string
+#define __string(item, src) __dynamic_array(char, item, -1)
+
+#undef DECLARE_EVENT_CLASS
+#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
+	struct ftrace_data_offsets_##call {				\
+		tstruct;						\
+	};
+
+#undef DEFINE_EVENT
+#define DEFINE_EVENT(template, name, proto, args)
+
+#undef DEFINE_EVENT_PRINT
+#define DEFINE_EVENT_PRINT(template, name, proto, args, print)	\
+	DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+/*
+ * Stage 3 of the trace events.
+ *
+ * Create the probe function : call even size calculation and write event data
+ * into the buffer.
+ */
+
+#undef __entry
+#define __entry field
+
+#undef TP_printk
+#define TP_printk(fmt, args...) fmt "\n", args
+
+#undef __get_dynamic_array
+#define __get_dynamic_array(field)	\
+		((void *)__entry + (__entry->__data_loc_##field & 0xffff))
+
+#undef __get_str
+#define __get_str(field) (char *)__get_dynamic_array(field)
+
+#undef __print_flags
+#define __print_flags(flag, delim, flag_array...)			\
+	({								\
+		static const struct trace_print_flags __flags[] =	\
+			{ flag_array, { -1, NULL }};			\
+		ftrace_print_flags_seq(p, delim, flag, __flags);	\
+	})
+
+#undef __print_symbolic
+#define __print_symbolic(value, symbol_array...)			\
+	({								\
+		static const struct trace_print_flags symbols[] =	\
+			{ symbol_array, { -1, NULL }};			\
+		ftrace_print_symbols_seq(p, value, symbols);		\
+	})
+
+#undef __print_hex
+#define __print_hex(buf, buf_len) ftrace_print_hex_seq(p, buf, buf_len)
+
+#undef DECLARE_EVENT_CLASS
+#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
+static notrace enum print_line_t					\
+ftrace_raw_output_##call(struct trace_iterator *iter, int flags,	\
+			 struct trace_event *trace_event)		\
+{									\
+	struct ftrace_event_call *event;				\
+	struct trace_seq *s = &iter->seq;				\
+	struct ftrace_raw_##call *field;				\
+	struct trace_entry *entry;					\
+	struct trace_seq *p = &iter->tmp_seq;				\
+	int ret;							\
+									\
+	event = container_of(trace_event, struct ftrace_event_call,	\
+			     event);					\
+									\
+	entry = iter->ent;						\
+									\
+	if (entry->type != event->event.type) {				\
+		WARN_ON_ONCE(1);					\
+		return TRACE_TYPE_UNHANDLED;				\
+	}								\
+									\
+	field = (typeof(field))entry;					\
+									\
+	trace_seq_init(p);						\
+	ret = trace_seq_printf(s, "%s: ", event->name);			\
+	if (ret)							\
+		ret = trace_seq_printf(s, print);			\
+	if (!ret)							\
+		return TRACE_TYPE_PARTIAL_LINE;				\
+									\
+	return TRACE_TYPE_HANDLED;					\
+}									\
+static struct trace_event_functions ftrace_event_type_funcs_##call = {	\
+	.trace			= ftrace_raw_output_##call,		\
+};
+
+#undef DEFINE_EVENT_PRINT
+#define DEFINE_EVENT_PRINT(template, call, proto, args, print)		\
+static notrace enum print_line_t					\
+ftrace_raw_output_##call(struct trace_iterator *iter, int flags,	\
+			 struct trace_event *event)			\
+{									\
+	struct trace_seq *s = &iter->seq;				\
+	struct ftrace_raw_##template *field;				\
+	struct trace_entry *entry;					\
+	struct trace_seq *p = &iter->tmp_seq;				\
+	int ret;							\
+									\
+	entry = iter->ent;						\
+									\
+	if (entry->type != event_##call.event.type) {			\
+		WARN_ON_ONCE(1);					\
+		return TRACE_TYPE_UNHANDLED;				\
+	}								\
+									\
+	field = (typeof(field))entry;					\
+									\
+	trace_seq_init(p);						\
+	ret = trace_seq_printf(s, "%s: ", #call);			\
+	if (ret)							\
+		ret = trace_seq_printf(s, print);			\
+	if (!ret)							\
+		return TRACE_TYPE_PARTIAL_LINE;				\
+									\
+	return TRACE_TYPE_HANDLED;					\
+}									\
+static struct trace_event_functions ftrace_event_type_funcs_##call = {	\
+	.trace			= ftrace_raw_output_##call,		\
+};
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+#undef __field_ext
+#define __field_ext(type, item, filter_type)				\
+	ret = trace_define_field(event_call, #type, #item,		\
+				 offsetof(typeof(field), item),		\
+				 sizeof(field.item),			\
+				 is_signed_type(type), filter_type);	\
+	if (ret)							\
+		return ret;
+
+#undef __field
+#define __field(type, item)	__field_ext(type, item, FILTER_OTHER)
+
+#undef __array
+#define __array(type, item, len)					\
+	BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);				\
+	ret = trace_define_field(event_call, #type "[" #len "]", #item,	\
+				 offsetof(typeof(field), item),		\
+				 sizeof(field.item),			\
+				 is_signed_type(type), FILTER_OTHER);	\
+	if (ret)							\
+		return ret;
+
+#undef __dynamic_array
+#define __dynamic_array(type, item, len)				       \
+	ret = trace_define_field(event_call, "__data_loc " #type "[]", #item,  \
+				 offsetof(typeof(field), __data_loc_##item),   \
+				 sizeof(field.__data_loc_##item),	       \
+				 is_signed_type(type), FILTER_OTHER);
+
+#undef __string
+#define __string(item, src) __dynamic_array(char, item, -1)
+
+#undef DECLARE_EVENT_CLASS
+#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)	\
+static int notrace							\
+ftrace_define_fields_##call(struct ftrace_event_call *event_call)	\
+{									\
+	struct ftrace_raw_##call field;					\
+	int ret;							\
+									\
+	tstruct;							\
+									\
+	return ret;							\
+}
+
+#undef DEFINE_EVENT
+#define DEFINE_EVENT(template, name, proto, args)
+
+#undef DEFINE_EVENT_PRINT
+#define DEFINE_EVENT_PRINT(template, name, proto, args, print)	\
+	DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+/*
+ * remember the offset of each array from the beginning of the event.
+ */
+
+#undef __entry
+#define __entry entry
+
+#undef __field
+#define __field(type, item)
+
+#undef __field_ext
+#define __field_ext(type, item, filter_type)
+
+#undef __array
+#define __array(type, item, len)
+
+#undef __dynamic_array
+#define __dynamic_array(type, item, len)				\
+	__data_offsets->item = __data_size +				\
+			       offsetof(typeof(*entry), __data);	\
+	__data_offsets->item |= (len * sizeof(type)) << 16;		\
+	__data_size += (len) * sizeof(type);
+
+#undef __string
+#define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)
+
+#undef DECLARE_EVENT_CLASS
+#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
+static inline notrace int ftrace_get_offsets_##call(			\
+	struct ftrace_data_offsets_##call *__data_offsets, proto)       \
+{									\
+	int __data_size = 0;						\
+	struct ftrace_raw_##call __maybe_unused *entry;			\
+									\
+	tstruct;							\
+									\
+	return __data_size;						\
+}
+
+#undef DEFINE_EVENT
+#define DEFINE_EVENT(template, name, proto, args)
+
+#undef DEFINE_EVENT_PRINT
+#define DEFINE_EVENT_PRINT(template, name, proto, args, print)	\
+	DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+/*
+ * Stage 4 of the trace events.
+ *
+ * Override the macros in <trace/trace_events.h> to include the following:
+ *
+ * For those macros defined with TRACE_EVENT:
+ *
+ * static struct ftrace_event_call event_<call>;
+ *
+ * static void ftrace_raw_event_<call>(void *__data, proto)
+ * {
+ *	struct ftrace_event_call *event_call = __data;
+ *	struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
+ *	struct ring_buffer_event *event;
+ *	struct ftrace_raw_<call> *entry; <-- defined in stage 1
+ *	struct ring_buffer *buffer;
+ *	unsigned long irq_flags;
+ *	int __data_size;
+ *	int pc;
+ *
+ *	local_save_flags(irq_flags);
+ *	pc = preempt_count();
+ *
+ *	__data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
+ *
+ *	event = trace_current_buffer_lock_reserve(&buffer,
+ *				  event_<call>->event.type,
+ *				  sizeof(*entry) + __data_size,
+ *				  irq_flags, pc);
+ *	if (!event)
+ *		return;
+ *	entry	= ring_buffer_event_data(event);
+ *
+ *	{ <assign>; }  <-- Here we assign the entries by the __field and
+ *			   __array macros.
+ *
+ *	if (!filter_current_check_discard(buffer, event_call, entry, event))
+ *		trace_current_buffer_unlock_commit(buffer,
+ *						   event, irq_flags, pc);
+ * }
+ *
+ * static struct trace_event ftrace_event_type_<call> = {
+ *	.trace			= ftrace_raw_output_<call>, <-- stage 2
+ * };
+ *
+ * static const char print_fmt_<call>[] = <TP_printk>;
+ *
+ * static struct ftrace_event_class __used event_class_<template> = {
+ *	.system			= "<system>",
+ *	.define_fields		= ftrace_define_fields_<call>,
+ *	.fields			= LIST_HEAD_INIT(event_class_##call.fields),
+ *	.raw_init		= trace_event_raw_init,
+ *	.probe			= ftrace_raw_event_##call,
+ *	.reg			= ftrace_event_reg,
+ * };
+ *
+ * static struct ftrace_event_call __used
+ * __attribute__((__aligned__(4)))
+ * __attribute__((section("_ftrace_events"))) event_<call> = {
+ *	.name			= "<call>",
+ *	.class			= event_class_<template>,
+ *	.event			= &ftrace_event_type_<call>,
+ *	.print_fmt		= print_fmt_<call>,
+ * };
+ *
+ */
+
+#ifdef CONFIG_PERF_EVENTS
+
+#define _TRACE_PERF_PROTO(call, proto)					\
+	static notrace void						\
+	perf_trace_##call(void *__data, proto);
+
+#define _TRACE_PERF_INIT(call)						\
+	.perf_probe		= perf_trace_##call,
+
+#else
+#define _TRACE_PERF_PROTO(call, proto)
+#define _TRACE_PERF_INIT(call)
+#endif /* CONFIG_PERF_EVENTS */
+
+#undef __entry
+#define __entry entry
+
+#undef __field
+#define __field(type, item)
+
+#undef __array
+#define __array(type, item, len)
+
+#undef __dynamic_array
+#define __dynamic_array(type, item, len)				\
+	__entry->__data_loc_##item = __data_offsets.item;
+
+#undef __string
+#define __string(item, src) __dynamic_array(char, item, -1)       	\
+
+#undef __assign_str
+#define __assign_str(dst, src)						\
+	strcpy(__get_str(dst), src);
+
+#undef TP_fast_assign
+#define TP_fast_assign(args...) args
+
+#undef TP_perf_assign
+#define TP_perf_assign(args...)
+
+#undef DECLARE_EVENT_CLASS
+#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
+									\
+static notrace void							\
+ftrace_raw_event_##call(void *__data, proto)				\
+{									\
+	struct ftrace_event_call *event_call = __data;			\
+	struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
+	struct ring_buffer_event *event;				\
+	struct ftrace_raw_##call *entry;				\
+	struct ring_buffer *buffer;					\
+	unsigned long irq_flags;					\
+	int __data_size;						\
+	int pc;								\
+									\
+	local_save_flags(irq_flags);					\
+	pc = preempt_count();						\
+									\
+	__data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
+									\
+	event = trace_current_buffer_lock_reserve(&buffer,		\
+				 event_call->event.type,		\
+				 sizeof(*entry) + __data_size,		\
+				 irq_flags, pc);			\
+	if (!event)							\
+		return;							\
+	entry	= ring_buffer_event_data(event);			\
+									\
+	tstruct								\
+									\
+	{ assign; }							\
+									\
+	if (!filter_current_check_discard(buffer, event_call, entry, event)) \
+		trace_nowake_buffer_unlock_commit(buffer,		\
+						  event, irq_flags, pc); \
+}
+/*
+ * The ftrace_test_probe is compiled out, it is only here as a build time check
+ * to make sure that if the tracepoint handling changes, the ftrace probe will
+ * fail to compile unless it too is updated.
+ */
+
+#undef DEFINE_EVENT
+#define DEFINE_EVENT(template, call, proto, args)			\
+static inline void ftrace_test_probe_##call(void)			\
+{									\
+	check_trace_callback_type_##call(ftrace_raw_event_##template);	\
+}
+
+#undef DEFINE_EVENT_PRINT
+#define DEFINE_EVENT_PRINT(template, name, proto, args, print)
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+#undef __entry
+#define __entry REC
+
+#undef __print_flags
+#undef __print_symbolic
+#undef __get_dynamic_array
+#undef __get_str
+
+#undef TP_printk
+#define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
+
+#undef DECLARE_EVENT_CLASS
+#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
+_TRACE_PERF_PROTO(call, PARAMS(proto));					\
+static const char print_fmt_##call[] = print;				\
+static struct ftrace_event_class __used event_class_##call = {		\
+	.system			= __stringify(TRACE_SYSTEM),		\
+	.define_fields		= ftrace_define_fields_##call,		\
+	.fields			= LIST_HEAD_INIT(event_class_##call.fields),\
+	.raw_init		= trace_event_raw_init,			\
+	.probe			= ftrace_raw_event_##call,		\
+	.reg			= ftrace_event_reg,			\
+	_TRACE_PERF_INIT(call)						\
+};
+
+#undef DEFINE_EVENT
+#define DEFINE_EVENT(template, call, proto, args)			\
+									\
+static struct ftrace_event_call __used					\
+__attribute__((__aligned__(4)))						\
+__attribute__((section("_ftrace_events"))) event_##call = {		\
+	.name			= #call,				\
+	.class			= &event_class_##template,		\
+	.event.funcs		= &ftrace_event_type_funcs_##template,	\
+	.print_fmt		= print_fmt_##template,			\
+};
+
+#undef DEFINE_EVENT_PRINT
+#define DEFINE_EVENT_PRINT(template, call, proto, args, print)		\
+									\
+static const char print_fmt_##call[] = print;				\
+									\
+static struct ftrace_event_call __used					\
+__attribute__((__aligned__(4)))						\
+__attribute__((section("_ftrace_events"))) event_##call = {		\
+	.name			= #call,				\
+	.class			= &event_class_##template,		\
+	.event.funcs		= &ftrace_event_type_funcs_##call,	\
+	.print_fmt		= print_fmt_##call,			\
+}
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+/*
+ * Define the insertion callback to perf events
+ *
+ * The job is very similar to ftrace_raw_event_<call> except that we don't
+ * insert in the ring buffer but in a perf counter.
+ *
+ * static void ftrace_perf_<call>(proto)
+ * {
+ *	struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
+ *	struct ftrace_event_call *event_call = &event_<call>;
+ *	extern void perf_tp_event(int, u64, u64, void *, int);
+ *	struct ftrace_raw_##call *entry;
+ *	struct perf_trace_buf *trace_buf;
+ *	u64 __addr = 0, __count = 1;
+ *	unsigned long irq_flags;
+ *	struct trace_entry *ent;
+ *	int __entry_size;
+ *	int __data_size;
+ *	int __cpu
+ *	int pc;
+ *
+ *	pc = preempt_count();
+ *
+ *	__data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
+ *
+ *	// Below we want to get the aligned size by taking into account
+ *	// the u32 field that will later store the buffer size
+ *	__entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
+ *			     sizeof(u64));
+ *	__entry_size -= sizeof(u32);
+ *
+ *	// Protect the non nmi buffer
+ *	// This also protects the rcu read side
+ *	local_irq_save(irq_flags);
+ *	__cpu = smp_processor_id();
+ *
+ *	if (in_nmi())
+ *		trace_buf = rcu_dereference_sched(perf_trace_buf_nmi);
+ *	else
+ *		trace_buf = rcu_dereference_sched(perf_trace_buf);
+ *
+ *	if (!trace_buf)
+ *		goto end;
+ *
+ *	trace_buf = per_cpu_ptr(trace_buf, __cpu);
+ *
+ * 	// Avoid recursion from perf that could mess up the buffer
+ * 	if (trace_buf->recursion++)
+ *		goto end_recursion;
+ *
+ * 	raw_data = trace_buf->buf;
+ *
+ *	// Make recursion update visible before entering perf_tp_event
+ *	// so that we protect from perf recursions.
+ *
+ *	barrier();
+ *
+ *	//zero dead bytes from alignment to avoid stack leak to userspace:
+ *	*(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
+ *	entry = (struct ftrace_raw_<call> *)raw_data;
+ *	ent = &entry->ent;
+ *	tracing_generic_entry_update(ent, irq_flags, pc);
+ *	ent->type = event_call->id;
+ *
+ *	<tstruct> <- do some jobs with dynamic arrays
+ *
+ *	<assign>  <- affect our values
+ *
+ *	perf_tp_event(event_call->id, __addr, __count, entry,
+ *		     __entry_size);  <- submit them to perf counter
+ *
+ * }
+ */
+
+#ifdef CONFIG_PERF_EVENTS
+
+#undef __entry
+#define __entry entry
+
+#undef __get_dynamic_array
+#define __get_dynamic_array(field)	\
+		((void *)__entry + (__entry->__data_loc_##field & 0xffff))
+
+#undef __get_str
+#define __get_str(field) (char *)__get_dynamic_array(field)
+
+#undef __perf_addr
+#define __perf_addr(a) __addr = (a)
+
+#undef __perf_count
+#define __perf_count(c) __count = (c)
+
+#undef DECLARE_EVENT_CLASS
+#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
+static notrace void							\
+perf_trace_##call(void *__data, proto)					\
+{									\
+	struct ftrace_event_call *event_call = __data;			\
+	struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
+	struct ftrace_raw_##call *entry;				\
+	struct pt_regs __regs;						\
+	u64 __addr = 0, __count = 1;					\
+	struct hlist_head *head;					\
+	int __entry_size;						\
+	int __data_size;						\
+	int rctx;							\
+									\
+	perf_fetch_caller_regs(&__regs);				\
+									\
+	__data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
+	__entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
+			     sizeof(u64));				\
+	__entry_size -= sizeof(u32);					\
+									\
+	if (WARN_ONCE(__entry_size > PERF_MAX_TRACE_SIZE,		\
+		      "profile buffer not large enough"))		\
+		return;							\
+									\
+	entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare(	\
+		__entry_size, event_call->event.type, &__regs, &rctx);	\
+	if (!entry)							\
+		return;							\
+									\
+	tstruct								\
+									\
+	{ assign; }							\
+									\
+	head = this_cpu_ptr(event_call->perf_events);			\
+	perf_trace_buf_submit(entry, __entry_size, rctx, __addr,	\
+		__count, &__regs, head);				\
+}
+
+/*
+ * This part is compiled out, it is only here as a build time check
+ * to make sure that if the tracepoint handling changes, the
+ * perf probe will fail to compile unless it too is updated.
+ */
+#undef DEFINE_EVENT
+#define DEFINE_EVENT(template, call, proto, args)			\
+static inline void perf_test_probe_##call(void)				\
+{									\
+	check_trace_callback_type_##call(perf_trace_##template);	\
+}
+
+
+#undef DEFINE_EVENT_PRINT
+#define DEFINE_EVENT_PRINT(template, name, proto, args, print)	\
+	DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+#endif /* CONFIG_PERF_EVENTS */
+
+#undef _TRACE_PROFILE_INIT
+
diff --git a/probes/lttng-type-list.h b/probes/lttng-type-list.h
new file mode 100644
index 00000000..38041b12
--- /dev/null
+++ b/probes/lttng-type-list.h
@@ -0,0 +1,61 @@
+/* Type list, used to create metadata */
+
+TRACE_EVENT_TYPE(long, integer)
+TRACE_EVENT_TYPE(unsigned long, integer)
+TRACE_EVENT_TYPE(int, integer)
+TRACE_EVENT_TYPE(unsigned int, integer)
+TRACE_EVENT_TYPE(short, integer)
+TRACE_EVENT_TYPE(unsigned short, integer)
+TRACE_EVENT_TYPE(char, integer)
+TRACE_EVENT_TYPE(signed char, integer)
+TRACE_EVENT_TYPE(unsigned char, integer)
+TRACE_EVENT_TYPE(bool, integer)
+TRACE_EVENT_TYPE(size_t, integer)
+TRACE_EVENT_TYPE(ssize_t, integer)
+TRACE_EVENT_TYPE(loff_t, integer)
+TRACE_EVENT_TYPE(u64, integer)
+TRACE_EVENT_TYPE(u32, integer)
+TRACE_EVENT_TYPE(u16, integer)
+TRACE_EVENT_TYPE(u8, integer)
+TRACE_EVENT_TYPE(s64, integer)
+TRACE_EVENT_TYPE(s32, integer)
+TRACE_EVENT_TYPE(s16, integer)
+TRACE_EVENT_TYPE(s8, integer)
+TRACE_EVENT_TYPE(void *, integer)
+
+/* Kernel-specific types */
+TRACE_EVENT_TYPE(pid_t, integer)
+TRACE_EVENT_TYPE(tid_t, integer)
+TRACE_EVENT_TYPE(uid_t, integer)
+TRACE_EVENT_TYPE(gid_t, integer)
+TRACE_EVENT_TYPE(ino_t, integer)
+TRACE_EVENT_TYPE(sector_t, integer)
+TRACE_EVENT_TYPE(blkcnt_t, integer)
+TRACE_EVENT_TYPE(pgoff_t, integer)
+TRACE_EVENT_TYPE(gfp_t, integer)
+TRACE_EVENT_TYPE(dev_t, integer)
+TRACE_EVENT_TYPE(umode_t, integer)
+TRACE_EVENT_TYPE(clockid_t, integer)
+TRACE_EVENT_TYPE(cputime_t, integer)
+
+/* Aliases needed by kernel instrumentation */
+TRACE_EVENT_TYPE(struct page *, integer)
+TRACE_EVENT_TYPE(unsigned, integer)
+TRACE_EVENT_TYPE(__u32, integer)
+TRACE_EVENT_TYPE(__u16, integer)
+
+/* Arrays */
+TRACE_EVENT_TYPE(task_comm, array, char, TASK_COMM_LEN)
+
+#include <linux/hrtimer.h>
+/* Enumerations */
+TRACE_EVENT_ENUM(hrtimer_mode,
+        V(HRTIMER_MODE_ABS),
+        V(HRTIMER_MODE_REL),
+        V(HRTIMER_MODE_PINNED),
+        V(HRTIMER_MODE_ABS_PINNED),
+        V(HRTIMER_MODE_REL_PINNED),
+	R(HRTIMER_MODE_UNDEFINED, 0x04, 0x100),	/* Example (to remove) */
+)
+
+TRACE_EVENT_TYPE(hrtimer_mode, enum, unsigned char)
diff --git a/probes/lttng-types.c b/probes/lttng-types.c
new file mode 100644
index 00000000..e1a41374
--- /dev/null
+++ b/probes/lttng-types.c
@@ -0,0 +1,175 @@
+/*
+ * probes/lttng-types.c
+ *
+ * Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * LTTng types.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/seq_file.h>
+#include <linux/jbd.h>	/* tid_t */
+#include <linux/debugfs.h>
+#include "lttng-types.h"
+
+struct dentry *lttng_types_dentry;
+
+#define ATYPE_ENTRY(name)	[atype_##name] = #name
+
+const char * const astract_types[NR_ABSTRACT_TYPES] = {
+	ATYPE_ENTRY(integer),
+	ATYPE_ENTRY(enum),
+	ATYPE_ENTRY(array),
+};
+
+#define STAGE_EXPORT_ENUMS
+#include "lttng-types.h"
+#include "lttng-type-list.h"
+#undef STAGE_EXPORT_ENUMS
+
+struct lttng_type lttng_types[] = {
+#define STAGE_EXPORT_TYPES
+#include "lttng-types.h"
+#include "lttng-type-list.h"
+#undef STAGE_EXPORT_TYPES
+};
+
+static void print_enum(struct seq_file *m, const struct lttng_enum *lttng_enum)
+{
+	int i;
+
+	for (i = 0; i < lttng_enum->len; i++) {
+		if (lttng_enum->entries[i].start == lttng_enum->entries[i].end)
+			seq_printf(m,	"\t\t{ %llu, %s },\n",
+					lttng_enum->entries[i].start,
+					lttng_enum->entries[i].string);
+		else
+			seq_printf(m,	"\t\t{ { %llu, %llu }, %s },\n",
+					lttng_enum->entries[i].start,
+					lttng_enum->entries[i].end,
+					lttng_enum->entries[i].string);
+	}
+}
+
+static void print_event_type(struct seq_file *m, const struct lttng_type *type)
+{
+	switch(type->atype) {
+	case atype_integer:
+		seq_printf(m,	"type %s {\n"
+				"\tparent = %s;\n"
+				"\tsize = %u;\n"
+				"\tsigned = %u;\n"
+				"\talign = %u;\n"
+				"};\n", type->name,
+				astract_types[type->atype],
+				type->u.integer.size,
+				type->u.integer.signedness,
+				type->u.integer.alignment);
+		break;
+	case atype_enum:
+		seq_printf(m,	"type %s {\n"
+				"\tparent = %s;\n"
+				"\tparent.parent = %s;\n"
+				"\tmap = {\n",
+				type->name,
+				astract_types[type->atype],
+				type->u.enumeration.parent_type);
+		print_enum(m, &type->u.enumeration.def);
+		seq_printf(m,	"\t};\n"
+				"};\n");
+		break;
+	case atype_array:
+		seq_printf(m,	"type %s {\n"
+				"\tparent = %s;\n"
+				"\telem_type = %s;\n"
+				"\tlength = %u;\n"
+				"};\n", type->name,
+				astract_types[type->atype],
+				type->u.array.elem_type,
+				type->u.array.length);
+		break;
+	default:
+		seq_printf(m,	"<<< unknown abstract type %s for type %s >>>\n",
+				astract_types[type->atype],
+				type->name);
+	}
+}
+
+static void *lttng_seq_start(struct seq_file *m, loff_t *pos)
+{
+	struct lttng_type *type = &lttng_types[*pos];
+
+	if (type > &lttng_types[ARRAY_SIZE(lttng_types) - 1])
+		return NULL;
+	return type;
+}
+
+static void *lttng_seq_next(struct seq_file *m, void *v, loff_t *ppos)
+{
+	struct lttng_type *type = &lttng_types[++(*ppos)];
+
+	if (type > &lttng_types[ARRAY_SIZE(lttng_types) - 1])
+		return NULL;
+	return type;
+}
+
+static void lttng_seq_stop(struct seq_file *m, void *v)
+{
+}
+
+static int lttng_seq_show(struct seq_file *m, void *v)
+{
+	struct lttng_type *type = v;
+
+	print_event_type(m, type);
+	return 0;
+}
+
+static const struct seq_operations lttng_types_seq_ops = {
+	.start = lttng_seq_start,
+	.next = lttng_seq_next,
+	.stop = lttng_seq_stop,
+	.show = lttng_seq_show,
+};
+
+static int
+lttng_types_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &lttng_types_seq_ops);
+}
+
+static const struct file_operations lttng_types_fops = {
+	.open = lttng_types_open,
+        .read = seq_read,
+	.llseek = seq_lseek,
+	.release = seq_release_private,
+};
+
+static int lttng_types_init(void)
+{
+	int ret = 0;
+
+	lttng_types_dentry = debugfs_create_file("lttng-types", S_IWUSR,
+					NULL, NULL, &lttng_types_fops);
+	if (IS_ERR(lttng_types_dentry) || !lttng_types_dentry) {
+		printk(KERN_ERR "Error creating LTTng type export file\n");
+		ret = -ENOMEM;
+		goto error;
+	}
+error:
+	return ret;
+}
+
+module_init(lttng_types_init);
+
+static void lttng_types_exit(void)
+{
+	debugfs_remove(lttng_types_dentry);
+}
+
+module_exit(lttng_types_exit);
+
+MODULE_LICENSE("GPL and additional rights");
+MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
+MODULE_DESCRIPTION("LTTng types");
diff --git a/probes/lttng-types.h b/probes/lttng-types.h
new file mode 100644
index 00000000..5f55ef6a
--- /dev/null
+++ b/probes/lttng-types.h
@@ -0,0 +1,116 @@
+/*
+ * Protect against multiple inclusion of structure declarations, but run the
+ * stages below each time.
+ */
+#ifndef _LTTNG_PROBES_LTTNG_TYPES_H
+#define _LTTNG_PROBES_LTTNG_TYPES_H
+
+#include <lttng.h>
+
+enum abstract_types {
+	atype_integer,
+	atype_enum,
+	atype_array,
+	NR_ABSTRACT_TYPES,
+};
+
+struct lttng_enum_entry {
+	unsigned long long start, end;	/* start and end are inclusive */
+	const char *string;
+};
+
+struct lttng_enum {
+	const struct lttng_enum_entry *entries;
+	unsigned int len;
+};
+
+struct lttng_type {
+	enum abstract_types atype;
+	const char *name;
+	union {
+		struct {
+			unsigned int size;		/* in bits */
+			unsigned short alignment;	/* in bits */
+			unsigned int signedness:1;
+		} integer;
+		struct {
+			const char *parent_type;
+			const struct lttng_enum def;
+		} enumeration;
+		struct {
+			const char *elem_type;
+			unsigned int length;		/* num. elems. */
+		} array;
+	} u;
+} __attribute__((packed));
+
+#endif /* _LTTNG_PROBES_LTTNG_TYPES_H */
+
+
+/* Export enumerations */
+
+#ifdef STAGE_EXPORT_ENUMS
+
+#undef TRACE_EVENT_TYPE
+#define TRACE_EVENT_TYPE(_name, _abstract_type, args...)
+
+#undef TRACE_EVENT_ENUM
+#define TRACE_EVENT_ENUM(_name, _entries...)				\
+	const struct lttng_enum_entry __trace_event_enum_##_name[] = {	\
+		PARAMS(_entries)					\
+	};
+
+/* Enumeration entry (single value) */
+#undef V
+#define V(_string)		{ _string, _string, #_string}
+
+/* Enumeration entry (range) */
+#undef R
+#define R(_string, _range_start, _range_end)				\
+	{ _range_start, _range_end, #_string }
+
+#endif /* STAGE_EXPORT_ENUMS */
+
+
+/* Export named types */
+
+#ifdef STAGE_EXPORT_TYPES
+
+#undef TRACE_EVENT_TYPE___integer
+#define TRACE_EVENT_TYPE___integer(_name, _unused)		\
+		{						\
+		  .atype = atype_integer,			\
+		  .name = #_name,				\
+		  .u.integer.size = sizeof(_name) * 8,		\
+		  .u.integer.alignment = __alignof__(_name) * 8,\
+		  .u.integer.signedness = is_signed_type(_name),\
+		},
+
+#undef TRACE_EVENT_TYPE___enum
+#define TRACE_EVENT_TYPE___enum(_name, _parent_type)		\
+		{						\
+		  .atype = atype_enum,				\
+		  .name = #_name,				\
+		  .u.enumeration.parent_type = #_parent_type,	\
+		  .u.enumeration.def.entries = __trace_event_enum_##_name, \
+		  .u.enumeration.def.len = ARRAY_SIZE(__trace_event_enum_##_name), \
+		},
+
+#undef TRACE_EVENT_TYPE___array
+#define TRACE_EVENT_TYPE___array(_name, _elem_type, _length)	\
+		{						\
+		  .atype = atype_array,				\
+		  .name = #_name,				\
+		  .u.array.elem_type = #_elem_type,		\
+		  .u.array.length = _length,			\
+		},
+
+/* Local declaration */
+#undef TRACE_EVENT_TYPE
+#define TRACE_EVENT_TYPE(_name, _abstract_type, args...)	\
+		TRACE_EVENT_TYPE___##_abstract_type(_name, args)
+
+#undef TRACE_EVENT_ENUM
+#define TRACE_EVENT_ENUM(_name, _entries...)
+
+#endif /* STAGE_EXPORT_TYPES */
diff --git a/probes/lttng.h b/probes/lttng.h
index e69de29b..d09ecb11 100644
--- a/probes/lttng.h
+++ b/probes/lttng.h
@@ -0,0 +1,10 @@
+#ifndef _LTTNG_PROBES_LTTNG_H
+#define _LTTNG_PROBES_LTTNG_H
+
+#undef is_signed_type
+#define is_signed_type(type)		(((type)(-1)) < 0)
+
+#undef PARAMS
+#define PARAMS(args...)		args
+
+#endif /* _LTTNG_PROBES_LTTNG_H */