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authorSteven Rostedt (Google) <rostedt@goodmis.org>2024-02-23 23:28:27 +0300
committerSteven Rostedt (Google) <rostedt@goodmis.org>2024-03-18 17:33:05 +0300
commitdd6ae6d90a84d4bec49887c7aa2b22aa1c8b2897 (patch)
treebd1d405a43397778b194c8631175df5f5d583136 /samples/trace_events
parentc759e609030ca37e59866cbc849fdc611cc56292 (diff)
downloadlinux-dd6ae6d90a84d4bec49887c7aa2b22aa1c8b2897.tar.xz
tracing: Add __string_len() example
There's no example code that uses __string_len(), and since the sample code is used for testing the event logic, add a use case. Link: https://lore.kernel.org/linux-trace-kernel/20240223152827.5f9f78e2@gandalf.local.home Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'samples/trace_events')
-rw-r--r--samples/trace_events/trace-events-sample.h7
1 files changed, 5 insertions, 2 deletions
diff --git a/samples/trace_events/trace-events-sample.h b/samples/trace_events/trace-events-sample.h
index f2d2d56ce8e2..2dfaf7fc7bfa 100644
--- a/samples/trace_events/trace-events-sample.h
+++ b/samples/trace_events/trace-events-sample.h
@@ -303,6 +303,7 @@ TRACE_EVENT(foo_bar,
__bitmask( cpus, num_possible_cpus() )
__cpumask( cpum )
__vstring( vstr, fmt, va )
+ __string_len( lstr, foo, bar / 2 < strlen(foo) ? bar / 2 : strlen(foo) )
),
TP_fast_assign(
@@ -311,12 +312,13 @@ TRACE_EVENT(foo_bar,
memcpy(__get_dynamic_array(list), lst,
__length_of(lst) * sizeof(int));
__assign_str(str, string);
+ __assign_str(lstr, foo);
__assign_vstr(vstr, fmt, va);
__assign_bitmask(cpus, cpumask_bits(mask), num_possible_cpus());
__assign_cpumask(cpum, cpumask_bits(mask));
),
- TP_printk("foo %s %d %s %s %s %s (%s) (%s) %s", __entry->foo, __entry->bar,
+ TP_printk("foo %s %d %s %s %s %s %s (%s) (%s) %s", __entry->foo, __entry->bar,
/*
* Notice here the use of some helper functions. This includes:
@@ -360,7 +362,8 @@ TRACE_EVENT(foo_bar,
__print_array(__get_dynamic_array(list),
__get_dynamic_array_len(list) / sizeof(int),
sizeof(int)),
- __get_str(str), __get_bitmask(cpus), __get_cpumask(cpum),
+ __get_str(str), __get_str(lstr),
+ __get_bitmask(cpus), __get_cpumask(cpum),
__get_str(vstr))
);