Commit b466b133 authored by Masami Hiramatsu's avatar Masami Hiramatsu Committed by Steven Rostedt (VMware)
Browse files

samples/trace_event: Add '__rel_loc' using sample event 

Add '__rel_loc' using sample event for testing.
User can use this for testing purpose. There is
no reason to use this macro from the kernel.

Link: https://lkml.kernel.org/r/163757343050.510314.2876529802471645178.stgit@devnote2



Cc: Beau Belgrave <beaub@linux.microsoft.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: default avatarMasami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent 55de2c0b

samples/trace_events/trace-events-sample.c

+3 −0
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ static const char *random_strings[] = { 


static void simple_thread_func(int cnt)

{

	unsigned long bitmask[1] = {0xdeadbeefUL};

	int array[6];

	int len = cnt % 5;

	int i;
@@ -43,6 +44,8 @@ static void simple_thread_func(int cnt) 
	trace_foo_with_template_cond("prints other times", cnt);



	trace_foo_with_template_print("I have to be different", cnt);



	trace_foo_rel_loc("Hello __rel_loc", cnt, bitmask);

}



static int simple_thread(void *arg)

samples/trace_events/trace-events-sample.h

+33 −0
Original line number Diff line number Diff line
@@ -506,6 +506,39 @@ DEFINE_EVENT_PRINT(foo_template, foo_with_template_print, 
	TP_ARGS(foo, bar),

	TP_printk("bar %s %d", __get_str(foo), __entry->bar));



/*

 * There are yet another __rel_loc dynamic data attribute. If you

 * use __rel_dynamic_array() and __rel_string() etc. macros, you

 * can use this attribute. There is no difference from the viewpoint

 * of functionality with/without 'rel' but the encoding is a bit

 * different. This is expected to be used with user-space event,

 * there is no reason that the kernel event use this, but only for

 * testing.

 */



TRACE_EVENT(foo_rel_loc,



	TP_PROTO(const char *foo, int bar, unsigned long *mask),



	TP_ARGS(foo, bar, mask),



	TP_STRUCT__entry(

		__rel_string(	foo,	foo	)

		__field(	int,	bar	)

		__rel_bitmask(	bitmask,

			BITS_PER_BYTE * sizeof(unsigned long)	)

	),



	TP_fast_assign(

		__assign_rel_str(foo, foo);

		__entry->bar = bar;

		__assign_rel_bitmask(bitmask, mask,

			BITS_PER_BYTE * sizeof(unsigned long));

	),



	TP_printk("foo_rel_loc %s, %d, %s", __get_rel_str(foo), __entry->bar,

		  __get_rel_bitmask(bitmask))

);

#endif



/***** NOTICE! The #if protection ends here. *****/