Commit 4263565d authored by Masami Hiramatsu's avatar Masami Hiramatsu Committed by Frederic Weisbecker
Browse files

tracing: Generate names for each kprobe event automatically 



Generate names for each kprobe event based on the probe point.
(SYMBOL+offs or MEMADDR).

Also remove generic k*probe event types because there is no user
of those types.

Signed-off-by: default avatarMasami Hiramatsu <mhiramat@redhat.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Avi Kivity <avi@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Frank Ch. Eigler <fche@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Jim Keniston <jkenisto@us.ibm.com>
Cc: K.Prasad <prasad@linux.vnet.ibm.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Przemysław Pawełczyk <przemyslaw@pawelczyk.it>
Cc: Roland McGrath <roland@redhat.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Tom Zanussi <tzanussi@gmail.com>
Cc: Vegard Nossum <vegard.nossum@gmail.com>
LKML-Reference: <20090813203526.31965.56672.stgit@localhost.localdomain>
Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
parent a82378d8

Documentation/trace/kprobetrace.txt

+2 −1
Original line number Diff line number Diff line
@@ -28,7 +28,8 @@ Synopsis of kprobe_events 
  p[:EVENT] SYMBOL[+offs|-offs]|MEMADDR [FETCHARGS]	: Set a probe

  r[:EVENT] SYMBOL[+0] [FETCHARGS]			: Set a return probe



 EVENT			: Event name.

 EVENT			: Event name. If omitted, the event name is generated

			  based on SYMBOL+offs or MEMADDR.

 SYMBOL[+offs|-offs]	: Symbol+offset where the probe is inserted.

 MEMADDR		: Address where the probe is inserted.

kernel/trace/trace_event_types.h

+0 −18
Original line number Diff line number Diff line
@@ -175,22 +175,4 @@ TRACE_EVENT_FORMAT(kmem_free, TRACE_KMEM_FREE, kmemtrace_free_entry, ignore, 
	TP_RAW_FMT("type:%u call_site:%lx ptr:%p")

);



TRACE_EVENT_FORMAT(kprobe, TRACE_KPROBE, kprobe_trace_entry, ignore,

	TRACE_STRUCT(

		TRACE_FIELD(unsigned long, ip, ip)

		TRACE_FIELD(int, nargs, nargs)

		TRACE_FIELD_ZERO(unsigned long, args)

	),

	TP_RAW_FMT("%08lx: args:0x%lx ...")

);



TRACE_EVENT_FORMAT(kretprobe, TRACE_KRETPROBE, kretprobe_trace_entry, ignore,

	TRACE_STRUCT(

		TRACE_FIELD(unsigned long, func, func)

		TRACE_FIELD(unsigned long, ret_ip, ret_ip)

		TRACE_FIELD(int, nargs, nargs)

		TRACE_FIELD_ZERO(unsigned long, args)

	),

	TP_RAW_FMT("%08lx <- %08lx: args:0x%lx ...")

);

#undef TRACE_SYSTEM

kernel/trace/trace_kprobe.c

+33 −31
Original line number Diff line number Diff line
@@ -34,6 +34,7 @@ 


#define MAX_TRACE_ARGS 128

#define MAX_ARGSTR_LEN 63

#define MAX_EVENT_NAME_LEN 64



/* currently, trace_kprobe only supports X86. */
@@ -280,11 +281,11 @@ static struct trace_probe *alloc_trace_probe(const char *symbol, 
		if (!tp->symbol)

			goto error;

	}

	if (event) {

	if (!event)

		goto error;

	tp->call.name = kstrdup(event, GFP_KERNEL);

	if (!tp->call.name)

		goto error;

	}



	INIT_LIST_HEAD(&tp->list);

	return tp;
@@ -314,7 +315,7 @@ static struct trace_probe *find_probe_event(const char *event) 
	struct trace_probe *tp;



	list_for_each_entry(tp, &probe_list, list)

		if (tp->call.name && !strcmp(tp->call.name, event))

		if (!strcmp(tp->call.name, event))

			return tp;

	return NULL;

}
@@ -330,7 +331,6 @@ static void __unregister_trace_probe(struct trace_probe *tp) 
/* Unregister a trace_probe and probe_event: call with locking probe_lock */

static void unregister_trace_probe(struct trace_probe *tp)

{

	if (tp->call.name)

	unregister_probe_event(tp);

	__unregister_trace_probe(tp);

	list_del(&tp->list);
@@ -360,7 +360,6 @@ static int register_trace_probe(struct trace_probe *tp) 
		goto end;

	}

	/* register as an event */

	if (tp->call.name) {

	old_tp = find_probe_event(tp->call.name);

	if (old_tp) {

		/* delete old event */
@@ -372,7 +371,6 @@ static int register_trace_probe(struct trace_probe *tp) 
		pr_warning("Faild to register probe event(%d)\n", ret);

		__unregister_trace_probe(tp);

	}

	}

	list_add_tail(&tp->list, &probe_list);

end:

	mutex_unlock(&probe_lock);
@@ -580,6 +578,17 @@ static int create_trace_probe(int argc, char **argv) 
	argc -= 2; argv += 2;



	/* setup a probe */

	if (!event) {

		/* Make a new event name */

		char buf[MAX_EVENT_NAME_LEN];

		if (symbol)

			snprintf(buf, MAX_EVENT_NAME_LEN, "%c@%s%+ld",

				 is_return ? 'r' : 'p', symbol, offset);

		else

			snprintf(buf, MAX_EVENT_NAME_LEN, "%c@0x%p",

				 is_return ? 'r' : 'p', addr);

		tp = alloc_trace_probe(symbol, buf, argc);

	} else

		tp = alloc_trace_probe(symbol, event, argc);

	if (IS_ERR(tp))

		return PTR_ERR(tp);
@@ -661,7 +670,6 @@ static int probes_seq_show(struct seq_file *m, void *v) 
	char buf[MAX_ARGSTR_LEN + 1];



	seq_printf(m, "%c", probe_is_return(tp) ? 'r' : 'p');

	if (tp->call.name)

	seq_printf(m, ":%s", tp->call.name);



	if (tp->symbol)
@@ -780,10 +788,7 @@ static __kprobes int kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs) 
	struct ring_buffer_event *event;

	int size, i, pc;

	unsigned long irq_flags;

	struct ftrace_event_call *call = &event_kprobe;



	if (&tp->call.name)

		call = &tp->call;

	struct ftrace_event_call *call = &tp->call;



	local_save_flags(irq_flags);

	pc = preempt_count();
@@ -815,10 +820,7 @@ static __kprobes int kretprobe_trace_func(struct kretprobe_instance *ri, 
	struct ring_buffer_event *event;

	int size, i, pc;

	unsigned long irq_flags;

	struct ftrace_event_call *call = &event_kretprobe;



	if (&tp->call.name)

		call = &tp->call;

	struct ftrace_event_call *call = &tp->call;



	local_save_flags(irq_flags);

	pc = preempt_count();

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