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authorMasami Hiramatsu <mhiramat@kernel.org>2021-11-22 18:30:30 +0900
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2021-12-06 15:37:22 -0500
commitb466b13321648d3bd7bfceb9afcba5302b585cf8 (patch)
tree6f5ef22ae41cd91c77ca54601d180a811a54c14f /samples
parent55de2c0b5610cba5a5a93c0788031133c457e689 (diff)
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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>
Diffstat (limited to 'samples')
-rw-r--r--samples/trace_events/trace-events-sample.c3
-rw-r--r--samples/trace_events/trace-events-sample.h33
2 files changed, 36 insertions, 0 deletions
diff --git a/samples/trace_events/trace-events-sample.c b/samples/trace_events/trace-events-sample.c
index 1a72b7d95cdc..4d34dc0b0fee 100644
--- a/samples/trace_events/trace-events-sample.c
+++ b/samples/trace_events/trace-events-sample.c
@@ -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)
diff --git a/samples/trace_events/trace-events-sample.h b/samples/trace_events/trace-events-sample.h
index e61471ab7d14..5ab74fc9a2df 100644
--- a/samples/trace_events/trace-events-sample.h
+++ b/samples/trace_events/trace-events-sample.h
@@ -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. *****/