Messages in this thread Patch in this message | | | Date | Thu, 17 Nov 2011 15:50:53 -0500 | From | Mathieu Desnoyers <> | Subject | [RFC PATCH] Tracepoint: introduce tracepoint() API |
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Introduce:
tracepoint(event_name, arg1, arg2, ...)
while keeping the old tracepoint API in place, e.g.:
trace_event_name(arg1, arg2, ...)
This allows skipping parameter side-effects (pointer dereference, function calls, ...) when the tracepoint is not dynamically activated.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> --- diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h index d530a44..c9c73f7 100644 --- a/include/linux/tracepoint.h +++ b/include/linux/tracepoint.h @@ -107,6 +107,12 @@ void tracepoint_update_probe_range(struct tracepoint * const *begin, #ifdef CONFIG_TRACEPOINTS +#define tracepoint(name, args...) \ + do { \ + if (static_branch(&__tracepoint_##name.key)) \ + __trace_##name(args); \ + } while (0) + /* * it_func[0] is never NULL because there is at least one element in the array * when the array itself is non NULL. @@ -144,13 +150,17 @@ void tracepoint_update_probe_range(struct tracepoint * const *begin, */ #define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \ extern struct tracepoint __tracepoint_##name; \ + static inline void __trace_##name(proto) \ + { \ + __DO_TRACE(&__tracepoint_##name, \ + TP_PROTO(data_proto), \ + TP_ARGS(data_args), \ + TP_CONDITION(cond)); \ + } \ static inline void trace_##name(proto) \ { \ if (static_branch(&__tracepoint_##name.key)) \ - __DO_TRACE(&__tracepoint_##name, \ - TP_PROTO(data_proto), \ - TP_ARGS(data_args), \ - TP_CONDITION(cond)); \ + __trace_##name(args); \ } \ static inline int \ register_trace_##name(void (*probe)(data_proto), void *data) \ @@ -193,7 +203,12 @@ void tracepoint_update_probe_range(struct tracepoint * const *begin, EXPORT_SYMBOL(__tracepoint_##name) #else /* !CONFIG_TRACEPOINTS */ + +#define tracepoint(name, args...) __trace_##name(args) + #define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \ + static inline void __trace_##name(proto) \ + { } \ static inline void trace_##name(proto) \ { } \ static inline int \ -- Mathieu Desnoyers Operating System Efficiency R&D Consultant EfficiOS Inc. http://www.efficios.com
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