[lttng-ust.git] / include / ust / tracepoint.h

#ifndef _UST_TRACEPOINT_H
#define _UST_TRACEPOINT_H

/*
 * Copyright (C) 2008 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
 * Copyright (C) 2009 Pierre-Marc Fournier
 * Copyright (C) 2009 Steven Rostedt <rostedt@goodmis.org>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
 *
 * Heavily inspired from the Linux Kernel Markers.
 *
 * Ported to userspace by Pierre-Marc Fournier.
 */

#define _LGPL_SOURCE
#include <urcu-bp.h>
#include <ust/immediate.h>
#include <ust/core.h>

struct module;
struct tracepoint;

struct tracepoint {
	const char *name;		/* Tracepoint name */
	DEFINE_IMV(char, state);	/* State. */
	void **funcs;
} __attribute__((aligned(32)));		/*
					 * Aligned on 32 bytes because it is
					 * globally visible and gcc happily
					 * align these on the structure size.
					 * Keep in sync with vmlinux.lds.h.
					 */

#define PARAMS(args...) args

#define TP_PROTO(args...)	args
#define TP_ARGS(args...)	args

#define CONFIG_TRACEPOINTS
#ifdef CONFIG_TRACEPOINTS

/*
 * it_func[0] is never NULL because there is at least one element in the array
 * when the array itself is non NULL.
 */
#define __DO_TRACE(tp, proto, args)					\
	do {								\
		void **it_func;						\
									\
		rcu_read_lock(); /*ust rcu_read_lock_sched_notrace();	*/			\
		it_func = rcu_dereference((tp)->funcs);			\
		if (it_func) {						\
			do {						\
				((void(*)(proto))(*it_func))(args);	\
			} while (*(++it_func));				\
		}							\
		rcu_read_unlock(); /*ust rcu_read_unlock_sched_notrace(); */			\
	} while (0)

#define __CHECK_TRACE(name, generic, proto, args)			\
	do {								\
		if (!generic) {						\
			if (unlikely(imv_read(__tracepoint_##name.state))) \
				__DO_TRACE(&__tracepoint_##name,	\
					TP_PROTO(proto), TP_ARGS(args));	\
		} else {						\
			if (unlikely(_imv_read(__tracepoint_##name.state))) \
				__DO_TRACE(&__tracepoint_##name,	\
					TP_PROTO(proto), TP_ARGS(args));	\
		}							\
	} while (0)

/*
 * Make sure the alignment of the structure in the __tracepoints section will
 * not add unwanted padding between the beginning of the section and the
 * structure. Force alignment to the same alignment as the section start.
 *
 * The "generic" argument, passed to the declared __trace_##name inline
 * function controls which tracepoint enabling mechanism must be used.
 * If generic is true, a variable read is used.
 * If generic is false, immediate values are used.
 */
#define DECLARE_TRACE(name, proto, args)				\
	extern struct tracepoint __tracepoint_##name;			\
	static inline void trace_##name(proto)				\
	{								\
		__CHECK_TRACE(name, 0, TP_PROTO(proto), TP_ARGS(args));	\
	}								\
	static inline void _trace_##name(proto)				\
	{								\
		__CHECK_TRACE(name, 1, TP_PROTO(proto), TP_ARGS(args));	\
	}								\
	static inline int register_trace_##name(void (*probe)(proto))	\
	{								\
		return tracepoint_probe_register(#name, (void *)probe);	\
	}								\
	static inline int unregister_trace_##name(void (*probe)(proto))	\
	{								\
		return tracepoint_probe_unregister(#name, (void *)probe);\
	}

#define DEFINE_TRACE(name)						\
	static const char __tpstrtab_##name[]				\
	__attribute__((section("__tracepoints_strings"))) = #name;	\
	struct tracepoint __tracepoint_##name				\
	__attribute__((section("__tracepoints"), aligned(32))) =	\
		{ __tpstrtab_##name, 0, NULL }

extern void tracepoint_update_probe_range(struct tracepoint *begin,
	struct tracepoint *end);

#else /* !CONFIG_TRACEPOINTS */
#define DECLARE_TRACE(name, proto, args)				\
	static inline void trace_##name(proto)				\
	{ }								\
	static inline void _trace_##name(proto)				\
	{ }								\
	static inline int register_trace_##name(void (*probe)(proto))	\
	{								\
		return -ENOSYS;						\
	}								\
	static inline int unregister_trace_##name(void (*probe)(proto))	\
	{								\
		return -ENOSYS;						\
	}

#define DEFINE_TRACE(name)
#define EXPORT_TRACEPOINT_SYMBOL_GPL(name)
#define EXPORT_TRACEPOINT_SYMBOL(name)

static inline void tracepoint_update_probe_range(struct tracepoint *begin,
	struct tracepoint *end)
{ }
#endif /* CONFIG_TRACEPOINTS */

/*
 * Connect a probe to a tracepoint.
 * Internal API, should not be used directly.
 */
extern int tracepoint_probe_register(const char *name, void *probe);

/*
 * Disconnect a probe from a tracepoint.
 * Internal API, should not be used directly.
 */
extern int tracepoint_probe_unregister(const char *name, void *probe);

extern int tracepoint_probe_register_noupdate(const char *name, void *probe);
extern int tracepoint_probe_unregister_noupdate(const char *name, void *probe);
extern void tracepoint_probe_update_all(void);

struct tracepoint_iter {
//ust//	struct module *module;
	struct tracepoint_lib *lib;
	struct tracepoint *tracepoint;
};

extern void tracepoint_iter_start(struct tracepoint_iter *iter);
extern void tracepoint_iter_next(struct tracepoint_iter *iter);
extern void tracepoint_iter_stop(struct tracepoint_iter *iter);
extern void tracepoint_iter_reset(struct tracepoint_iter *iter);
extern int tracepoint_get_iter_range(struct tracepoint **tracepoint,
	struct tracepoint *begin, struct tracepoint *end);

/*
 * tracepoint_synchronize_unregister must be called between the last tracepoint
 * probe unregistration and the end of module exit to make sure there is no
 * caller executing a probe when it is freed.
 */
static inline void tracepoint_synchronize_unregister(void)
{
//ust//	synchronize_sched();
}

struct tracepoint_lib {
	struct tracepoint *tracepoints_start;
	int tracepoints_count;
	struct list_head list;
};

extern int tracepoint_register_lib(struct tracepoint *tracepoints_start,
				   int tracepoints_count);
extern int tracepoint_unregister_lib(struct tracepoint *tracepoints_start);

#define TRACEPOINT_LIB							\
	extern struct tracepoint __start___tracepoints[] __attribute__((weak, visibility("hidden"))); \
	extern struct tracepoint __stop___tracepoints[] __attribute__((weak, visibility("hidden"))); \
	static void __attribute__((constructor)) __tracepoints__init(void) \
	{								\
		tracepoint_register_lib(__start___tracepoints,		\
					(((long)__stop___tracepoints)-((long)__start___tracepoints))/sizeof(struct tracepoint)); \
	} \
	\
	static void __attribute__((destructor)) __tracepoints__destroy(void) \
	{								\
		tracepoint_unregister_lib(__start___tracepoints); \
	}


#ifndef TRACE_EVENT
/*
 * For use with the TRACE_EVENT macro:
 *
 * We define a tracepoint, its arguments, its printf format
 * and its 'fast binary record' layout.
 *
 * Firstly, name your tracepoint via TRACE_EVENT(name : the
 * 'subsystem_event' notation is fine.
 *
 * Think about this whole construct as the
 * 'trace_sched_switch() function' from now on.
 *
 *
 *  TRACE_EVENT(sched_switch,
 *
 *	*
 *	* A function has a regular function arguments
 *	* prototype, declare it via TP_PROTO():
 *	*
 *
 *	TP_PROTO(struct rq *rq, struct task_struct *prev,
 *		 struct task_struct *next),
 *
 *	*
 *	* Define the call signature of the 'function'.
 *	* (Design sidenote: we use this instead of a
 *	*  TP_PROTO1/TP_PROTO2/TP_PROTO3 ugliness.)
 *	*
 *
 *	TP_ARGS(rq, prev, next),
 *
 *	*
 *	* Fast binary tracing: define the trace record via
 *	* TP_STRUCT__entry(). You can think about it like a
 *	* regular C structure local variable definition.
 *	*
 *	* This is how the trace record is structured and will
 *	* be saved into the ring buffer. These are the fields
 *	* that will be exposed to readers.
 *	*
 *	* The declared 'local variable' is called '__entry'
 *	*
 *	* __field(pid_t, prev_prid) is equivalent to a standard declariton:
 *	*
 *	*	pid_t	prev_pid;
 *	*
 *	* __array(char, prev_comm, TASK_COMM_LEN) is equivalent to:
 *	*
 *	*	char	prev_comm[TASK_COMM_LEN];
 *	*
 *
 *	TP_STRUCT__entry(
 *		__array(	char,	prev_comm,	TASK_COMM_LEN	)
 *		__field(	pid_t,	prev_pid			)
 *		__field(	int,	prev_prio			)
 *		__array(	char,	next_comm,	TASK_COMM_LEN	)
 *		__field(	pid_t,	next_pid			)
 *		__field(	int,	next_prio			)
 *	),
 *
 *	*
 *	* Assign the entry into the trace record, by embedding
 *	* a full C statement block into TP_fast_assign(). You
 *	* can refer to the trace record as '__entry' -
 *	* otherwise you can put arbitrary C code in here.
 *	*
 *	* Note: this C code will execute every time a trace event
 *	* happens, on an active tracepoint.
 *	*
 *
 *	TP_fast_assign(
 *		memcpy(__entry->next_comm, next->comm, TASK_COMM_LEN);
 *		__entry->prev_pid	= prev->pid;
 *		__entry->prev_prio	= prev->prio;
 *		memcpy(__entry->prev_comm, prev->comm, TASK_COMM_LEN);
 *		__entry->next_pid	= next->pid;
 *		__entry->next_prio	= next->prio;
 *	)
 *
 *	*
 *	* Formatted output of a trace record via TP_printf().
 *	* This is how the tracepoint will appear under debugging
 *	* of tracepoints.
 *	*
 *	* (raw-binary tracing wont actually perform this step.)
 *	*
 *
 *	TP_printf("task %s:%d [%d] ==> %s:%d [%d]",
 *		__entry->prev_comm, __entry->prev_pid, __entry->prev_prio,
 *		__entry->next_comm, __entry->next_pid, __entry->next_prio),
 *
 * );
 *
 * This macro construct is thus used for the regular printf format
 * tracing setup.
 *
 * A set of (un)registration functions can be passed to the variant
 * TRACE_EVENT_FN to perform any (un)registration work.
 */

#define DECLARE_TRACE_EVENT_CLASS(name, proto, args, tstruct, assign, print)
#define DEFINE_TRACE_EVENT(template, name, proto, args)		\
	DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
#define DEFINE_TRACE_EVENT_PRINT(template, name, proto, args, print)	\
	DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))

#define TRACE_EVENT(name, proto, args, struct, assign, print)	\
	DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
#define TRACE_EVENT_FN(name, proto, args, struct,		\
		assign, print, reg, unreg)			\
	DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))

#endif /* ifdef TRACE_EVENT (see note above) */


#endif /* _UST_TRACEPOINT_H */
Commit	Line	Data
27b052e3 PMF	1	#ifndef _UST_TRACEPOINT_H
27b052e3 PMF	2	#define _UST_TRACEPOINT_H
f99be407 PMF	3
f99be407 PMF	4	/*
1f8b0dff PMF	5	* Copyright (C) 2008 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
1f8b0dff PMF	6	* Copyright (C) 2009 Pierre-Marc Fournier
22d72948	7	* Copyright (C) 2009 Steven Rostedt <rostedt@goodmis.org>
f99be407	8	*
8fc2d8db PMF	9	* This library is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU Lesser General Public
	11	* License as published by the Free Software Foundation; either
	12	* version 2.1 of the License, or (at your option) any later version.
f99be407	13	*
8fc2d8db	14	* This library is distributed in the hope that it will be useful,
1f8b0dff	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
8fc2d8db PMF	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
8fc2d8db PMF	17	* Lesser General Public License for more details.
1f8b0dff	18	*
8fc2d8db PMF	19	* You should have received a copy of the GNU Lesser General Public
	20	* License along with this library; if not, write to the Free Software
	21	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
f99be407 PMF	22	*
	23	* Heavily inspired from the Linux Kernel Markers.
	24	*
1f8b0dff	25	* Ported to userspace by Pierre-Marc Fournier.
f99be407 PMF	26	*/
f99be407 PMF	27
872037bb	28	#define _LGPL_SOURCE
b7ea1a1c	29	#include <urcu-bp.h>
93d0f2ea	30	#include <ust/immediate.h>
518d7abb	31	#include <ust/core.h>
f99be407 PMF	32
	33	struct module;
	34	struct tracepoint;
	35
	36	struct tracepoint {
	37	const char name; / Tracepoint name */
	38	DEFINE_IMV(char, state); /* State. */
	39	void **funcs;
	40	} __attribute__((aligned(32))); /*
	41	* Aligned on 32 bytes because it is
	42	* globally visible and gcc happily
	43	* align these on the structure size.
	44	* Keep in sync with vmlinux.lds.h.
	45	*/
	46
22d72948 NC	47	#define PARAMS(args...) args
22d72948 NC	48
7166e240 PMF	49	#define TP_PROTO(args...) args
7166e240 PMF	50	#define TP_ARGS(args...) args
f99be407	51
872037bb PMF	52	#define CONFIG_TRACEPOINTS
872037bb PMF	53	#ifdef CONFIG_TRACEPOINTS
f99be407 PMF	54
	55	/*
	56	* it_func[0] is never NULL because there is at least one element in the array
	57	* when the array itself is non NULL.
	58	*/
	59	#define __DO_TRACE(tp, proto, args) \
	60	do { \
	61	void **it_func; \
	62	\
6cb88bc0	63	rcu_read_lock(); /ust rcu_read_lock_sched_notrace(); / \
f99be407 PMF	64	it_func = rcu_dereference((tp)->funcs); \
	65	if (it_func) { \
	66	do { \
	67	((void()(proto))(it_func))(args); \
	68	} while (*(++it_func)); \
	69	} \
6cb88bc0	70	rcu_read_unlock(); /ust rcu_read_unlock_sched_notrace(); / \
f99be407 PMF	71	} while (0)
	72
	73	#define __CHECK_TRACE(name, generic, proto, args) \
	74	do { \
	75	if (!generic) { \
	76	if (unlikely(imv_read(__tracepoint_##name.state))) \
	77	__DO_TRACE(&__tracepoint_##name, \
7166e240	78	TP_PROTO(proto), TP_ARGS(args)); \
f99be407 PMF	79	} else { \
	80	if (unlikely(_imv_read(__tracepoint_##name.state))) \
	81	__DO_TRACE(&__tracepoint_##name, \
7166e240	82	TP_PROTO(proto), TP_ARGS(args)); \
f99be407 PMF	83	} \
	84	} while (0)
	85
	86	/*
	87	* Make sure the alignment of the structure in the __tracepoints section will
	88	* not add unwanted padding between the beginning of the section and the
	89	* structure. Force alignment to the same alignment as the section start.
	90	*
	91	* The "generic" argument, passed to the declared __trace_##name inline
	92	* function controls which tracepoint enabling mechanism must be used.
	93	* If generic is true, a variable read is used.
	94	* If generic is false, immediate values are used.
	95	*/
	96	#define DECLARE_TRACE(name, proto, args) \
	97	extern struct tracepoint __tracepoint_##name; \
	98	static inline void trace_##name(proto) \
	99	{ \
7166e240	100	__CHECK_TRACE(name, 0, TP_PROTO(proto), TP_ARGS(args)); \
f99be407 PMF	101	} \
	102	static inline void _trace_##name(proto) \
	103	{ \
7166e240	104	__CHECK_TRACE(name, 1, TP_PROTO(proto), TP_ARGS(args)); \
f99be407 PMF	105	} \
	106	static inline int register_trace_##name(void (*probe)(proto)) \
	107	{ \
	108	return tracepoint_probe_register(#name, (void *)probe); \
	109	} \
	110	static inline int unregister_trace_##name(void (*probe)(proto)) \
	111	{ \
	112	return tracepoint_probe_unregister(#name, (void *)probe);\
	113	}
	114
	115	#define DEFINE_TRACE(name) \
	116	static const char __tpstrtab_##name[] \
	117	__attribute__((section("__tracepoints_strings"))) = #name; \
	118	struct tracepoint __tracepoint_##name \
	119	__attribute__((section("__tracepoints"), aligned(32))) = \
	120	{ __tpstrtab_##name, 0, NULL }
	121
f99be407 PMF	122	extern void tracepoint_update_probe_range(struct tracepoint *begin,
	123	struct tracepoint *end);
	124
872037bb PMF	125	#else /* !CONFIG_TRACEPOINTS */
	126	#define DECLARE_TRACE(name, proto, args) \
	127	static inline void trace_##name(proto) \
	128	{ } \
	129	static inline void _trace_##name(proto) \
	130	{ } \
	131	static inline int register_trace_##name(void (*probe)(proto)) \
	132	{ \
	133	return -ENOSYS; \
	134	} \
	135	static inline int unregister_trace_##name(void (*probe)(proto)) \
	136	{ \
	137	return -ENOSYS; \
	138	}
	139
	140	#define DEFINE_TRACE(name)
	141	#define EXPORT_TRACEPOINT_SYMBOL_GPL(name)
	142	#define EXPORT_TRACEPOINT_SYMBOL(name)
	143
	144	static inline void tracepoint_update_probe_range(struct tracepoint *begin,
	145	struct tracepoint *end)
	146	{ }
	147	#endif /* CONFIG_TRACEPOINTS */
f99be407 PMF	148
	149	/*
	150	* Connect a probe to a tracepoint.
	151	* Internal API, should not be used directly.
	152	*/
	153	extern int tracepoint_probe_register(const char name, void probe);
	154
	155	/*
	156	* Disconnect a probe from a tracepoint.
	157	* Internal API, should not be used directly.
	158	*/
	159	extern int tracepoint_probe_unregister(const char name, void probe);
	160
	161	extern int tracepoint_probe_register_noupdate(const char name, void probe);
	162	extern int tracepoint_probe_unregister_noupdate(const char name, void probe);
	163	extern void tracepoint_probe_update_all(void);
	164
	165	struct tracepoint_iter {
474d745f PMF	166	//ust// struct module *module;
474d745f PMF	167	struct tracepoint_lib *lib;
f99be407 PMF	168	struct tracepoint *tracepoint;
	169	};
	170
	171	extern void tracepoint_iter_start(struct tracepoint_iter *iter);
	172	extern void tracepoint_iter_next(struct tracepoint_iter *iter);
	173	extern void tracepoint_iter_stop(struct tracepoint_iter *iter);
	174	extern void tracepoint_iter_reset(struct tracepoint_iter *iter);
	175	extern int tracepoint_get_iter_range(struct tracepoint **tracepoint,
	176	struct tracepoint begin, struct tracepoint end);
	177
	178	/*
	179	* tracepoint_synchronize_unregister must be called between the last tracepoint
	180	* probe unregistration and the end of module exit to make sure there is no
	181	* caller executing a probe when it is freed.
	182	*/
	183	static inline void tracepoint_synchronize_unregister(void)
	184	{
270c6b98	185	//ust// synchronize_sched();
f99be407 PMF	186	}
f99be407 PMF	187
474d745f PMF	188	struct tracepoint_lib {
	189	struct tracepoint *tracepoints_start;
	190	int tracepoints_count;
	191	struct list_head list;
	192	};
	193
872037bb PMF	194	extern int tracepoint_register_lib(struct tracepoint *tracepoints_start,
872037bb PMF	195	int tracepoints_count);
24b6668c	196	extern int tracepoint_unregister_lib(struct tracepoint *tracepoints_start);
872037bb PMF	197
872037bb PMF	198	#define TRACEPOINT_LIB \
55994a67 JB	199	extern struct tracepoint __start___tracepoints[] __attribute__((weak, visibility("hidden"))); \
55994a67 JB	200	extern struct tracepoint __stop___tracepoints[] __attribute__((weak, visibility("hidden"))); \
872037bb PMF	201	static void __attribute__((constructor)) __tracepoints__init(void) \
	202	{ \
	203	tracepoint_register_lib(__start___tracepoints, \
	204	(((long)__stop___tracepoints)-((long)__start___tracepoints))/sizeof(struct tracepoint)); \
24b6668c PMF	205	} \
	206	\
	207	static void __attribute__((destructor)) __tracepoints__destroy(void) \
	208	{ \
	209	tracepoint_unregister_lib(__start___tracepoints); \
872037bb PMF	210	}
872037bb PMF	211
22d72948 NC	212
	213	#ifndef TRACE_EVENT
	214	/*
	215	* For use with the TRACE_EVENT macro:
	216	*
	217	* We define a tracepoint, its arguments, its printf format
	218	* and its 'fast binary record' layout.
	219	*
	220	* Firstly, name your tracepoint via TRACE_EVENT(name : the
	221	* 'subsystem_event' notation is fine.
	222	*
	223	* Think about this whole construct as the
	224	* 'trace_sched_switch() function' from now on.
	225	*
	226	*
	227	* TRACE_EVENT(sched_switch,
	228	*
	229	* *
	230	* * A function has a regular function arguments
	231	* * prototype, declare it via TP_PROTO():
	232	* *
	233	*
	234	* TP_PROTO(struct rq rq, struct task_struct prev,
	235	* struct task_struct *next),
	236	*
	237	* *
	238	* * Define the call signature of the 'function'.
	239	* * (Design sidenote: we use this instead of a
	240	* * TP_PROTO1/TP_PROTO2/TP_PROTO3 ugliness.)
	241	* *
	242	*
	243	* TP_ARGS(rq, prev, next),
	244	*
	245	* *
	246	* * Fast binary tracing: define the trace record via
	247	* * TP_STRUCT__entry(). You can think about it like a
	248	* * regular C structure local variable definition.
	249	* *
	250	* * This is how the trace record is structured and will
	251	* * be saved into the ring buffer. These are the fields
	252	* * that will be exposed to readers.
	253	* *
	254	* * The declared 'local variable' is called '__entry'
	255	* *
	256	* * __field(pid_t, prev_prid) is equivalent to a standard declariton:
	257	* *
	258	* * pid_t prev_pid;
	259	* *
	260	* * __array(char, prev_comm, TASK_COMM_LEN) is equivalent to:
	261	* *
	262	* * char prev_comm[TASK_COMM_LEN];
	263	* *
	264	*
	265	* TP_STRUCT__entry(
	266	* __array( char, prev_comm, TASK_COMM_LEN )
	267	* __field( pid_t, prev_pid )
	268	* __field( int, prev_prio )
	269	* __array( char, next_comm, TASK_COMM_LEN )
	270	* __field( pid_t, next_pid )
	271	* __field( int, next_prio )
	272	* ),
	273	*
	274	* *
	275	* * Assign the entry into the trace record, by embedding
276	* * a full C statement block into TP_fast_assign(). You
277	* * can refer to the trace record as '__entry' -
278	* * otherwise you can put arbitrary C code in here.
279	* *
280	* * Note: this C code will execute every time a trace event
281	* * happens, on an active tracepoint.
282	* *
283	*
284	* TP_fast_assign(
285	* memcpy(__entry->next_comm, next->comm, TASK_COMM_LEN);
286	* __entry->prev_pid = prev->pid;
287	* __entry->prev_prio = prev->prio;
288	* memcpy(__entry->prev_comm, prev->comm, TASK_COMM_LEN);
289	* __entry->next_pid = next->pid;
290	* __entry->next_prio = next->prio;
291	* )
292	*
293	* *
294	* * Formatted output of a trace record via TP_printf().
295	* * This is how the tracepoint will appear under debugging
296	* * of tracepoints.
297	* *
298	* * (raw-binary tracing wont actually perform this step.)
299	* *
300	*
301	* TP_printf("task %s:%d [%d] ==> %s:%d [%d]",
302	* __entry->prev_comm, __entry->prev_pid, __entry->prev_prio,
303	* __entry->next_comm, __entry->next_pid, __entry->next_prio),
304	*
305	* );
306	*
307	* This macro construct is thus used for the regular printf format
308	* tracing setup.
309	*
310	* A set of (un)registration functions can be passed to the variant
311	* TRACE_EVENT_FN to perform any (un)registration work.
312	*/
313
314	#define DECLARE_TRACE_EVENT_CLASS(name, proto, args, tstruct, assign, print)
315	#define DEFINE_TRACE_EVENT(template, name, proto, args) \
316	DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
317	#define DEFINE_TRACE_EVENT_PRINT(template, name, proto, args, print) \
318	DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
319
320	#define TRACE_EVENT(name, proto, args, struct, assign, print) \
321	DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
322	#define TRACE_EVENT_FN(name, proto, args, struct, \
323	assign, print, reg, unreg) \
324	DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
325
326	#endif /* ifdef TRACE_EVENT (see note above) */
327
328
27b052e3	329	#endif /* _UST_TRACEPOINT_H */