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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: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu 2021-11-22 18:30:30 +09:00 committed by Steven Rostedt (VMware)
parent 55de2c0b56
commit b466b13321
2 changed files with 36 additions and 0 deletions
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3
samples/trace_events/trace-events-sample.c
View File

@ -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)

33
samples/trace_events/trace-events-sample.h
View File

@ -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. *****/