X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=include%2Fust%2Ftracepoint.h;h=ec1a4fce76bf55ec6cb1085688dcd7a0e4a1622c;hb=42be6c46cb6afa9720c224c24ccabb2ce21293d1;hp=2d6f7abbdccd492b152b476747211da85e70c23a;hpb=103fffbc740f24681dfb5d9c7bb78b44f285036d;p=ust.git diff --git a/include/ust/tracepoint.h b/include/ust/tracepoint.h index 2d6f7ab..ec1a4fc 100644 --- a/include/ust/tracepoint.h +++ b/include/ust/tracepoint.h @@ -27,10 +27,8 @@ #define _LGPL_SOURCE #include -#include #include -struct module; struct tracepoint; struct probe { @@ -40,7 +38,7 @@ struct probe { struct tracepoint { const char *name; /* Tracepoint name */ - DEFINE_IMV(char, state); /* State. */ + char state; /* State. */ struct probe *probes; }; @@ -49,6 +47,18 @@ struct tracepoint { #define TP_PROTO(args...) args #define TP_ARGS(args...) args +/* + * Tracepoints should be added to the instrumented code using the + * "tracepoint()" macro. + */ +#define tracepoint(name, args...) __trace_##name(args) + +#define register_tracepoint(name, probe, data) \ + __register_trace_##name(probe, data) + +#define unregister_tracepoint(name, probe, data) \ + __unregister_trace_##name(probe, data) + #define CONFIG_TRACEPOINTS #ifdef CONFIG_TRACEPOINTS @@ -74,50 +84,34 @@ struct tracepoint { rcu_read_unlock(); \ } while (0) -#define __CHECK_TRACE(name, generic, proto, args) \ +#define __CHECK_TRACE(name, proto, args) \ do { \ - if (!generic) { \ - if (unlikely(imv_read(__tracepoint_##name.state))) \ - __DO_TRACE(&__tracepoint_##name, \ - TP_PROTO(proto), TP_ARGS(args)); \ - } else { \ - if (unlikely(_imv_read(__tracepoint_##name.state))) \ - __DO_TRACE(&__tracepoint_##name, \ - TP_PROTO(proto), TP_ARGS(args)); \ - } \ + if (unlikely(__tracepoint_##name.state)) \ + __DO_TRACE(&__tracepoint_##name, \ + TP_PROTO(proto), TP_ARGS(args)); \ } while (0) /* * Make sure the alignment of the structure in the __tracepoints section will * not add unwanted padding between the beginning of the section and the * structure. Force alignment to the same alignment as the section start. - * - * The "generic" argument, passed to the declared __trace_##name inline - * function controls which tracepoint enabling mechanism must be used. - * If generic is true, a variable read is used. - * If generic is false, immediate values are used. */ #define __DECLARE_TRACE(name, proto, args, data_proto, data_args) \ extern struct tracepoint __tracepoint_##name; \ - static inline void trace_##name(proto) \ + static inline void __trace_##name(proto) \ { \ - __CHECK_TRACE(name, 0, TP_PROTO(data_proto), \ - TP_ARGS(data_args)); \ - } \ - static inline void _trace_##name(proto) \ - { \ - __CHECK_TRACE(name, 1, TP_PROTO(data_proto), \ + __CHECK_TRACE(name, TP_PROTO(data_proto), \ TP_ARGS(data_args)); \ } \ static inline int \ - register_trace_##name(void (*probe)(data_proto), void *data) \ + __register_trace_##name(void (*probe)(data_proto), void *data) \ { \ return tracepoint_probe_register(#name, (void *)probe, \ data); \ \ } \ static inline int \ - unregister_trace_##name(void (*probe)(data_proto), void *data) \ + __unregister_trace_##name(void (*probe)(data_proto), void *data)\ { \ return tracepoint_probe_unregister(#name, (void *)probe, \ data); \ @@ -145,11 +139,11 @@ extern void tracepoint_update_probe_range(struct tracepoint * const *begin, { } \ static inline void _trace_##name(proto) \ { } \ - static inline int register_trace_##name(void (*probe)(proto), void *data) \ + static inline int __register_trace_##name(void (*probe)(proto), void *data) \ { \ return -ENOSYS; \ } \ - static inline int unregister_trace_##name(void (*probe)(proto), void *data) \ + static inline int __unregister_trace_##name(void (*probe)(proto), void *data) \ { \ return -ENOSYS; \ } @@ -163,10 +157,27 @@ static inline void tracepoint_update_probe_range(struct tracepoint *begin, { } #endif /* CONFIG_TRACEPOINTS */ -#define DECLARE_TRACE(name, proto, args) \ - __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \ - PARAMS(void *__data, proto), \ - PARAMS(__data, args)) +/* + * The need for the DECLARE_TRACE_NOARGS() is to handle the prototype + * (void). "void" is a special value in a function prototype and can + * not be combined with other arguments. Since the DECLARE_TRACE() + * macro adds a data element at the beginning of the prototype, + * we need a way to differentiate "(void *data, proto)" from + * "(void *data, void)". The second prototype is invalid. + * + * DECLARE_TRACE_NOARGS() passes "void" as the tracepoint prototype + * and "void *__data" as the callback prototype. + * + * DECLARE_TRACE() passes "proto" as the tracepoint protoype and + * "void *__data, proto" as the callback prototype. + */ +#define DECLARE_TRACE_NOARGS(name) \ + __DECLARE_TRACE(name, void, , void *__data, __data) + +#define DECLARE_TRACE(name, proto, args) \ + __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \ + PARAMS(void *__data, proto), \ + PARAMS(__data, args)) /* * Connect a probe to a tracepoint. @@ -187,7 +198,6 @@ extern int tracepoint_probe_unregister_noupdate(const char *name, void *probe, extern void tracepoint_probe_update_all(void); struct tracepoint_iter { -//ust// struct module *module; struct tracepoint_lib *lib; struct tracepoint * const *tracepoint; }; @@ -222,6 +232,8 @@ extern int tracepoint_unregister_lib(struct tracepoint * const *tracepoints_star #define TRACEPOINT_LIB \ extern struct tracepoint * const __start___tracepoints_ptrs[] __attribute__((weak, visibility("hidden"))); \ extern struct tracepoint * const __stop___tracepoints_ptrs[] __attribute__((weak, visibility("hidden"))); \ + static struct tracepoint * const __tracepoint_ptr_dummy \ + __attribute__((used, section("__tracepoints_ptrs"))) = NULL; \ static void __attribute__((constructor)) __tracepoints__init(void) \ { \ tracepoint_register_lib(__start___tracepoints_ptrs, \ @@ -377,6 +389,8 @@ extern int trace_event_unregister_lib(struct trace_event * const *start_trace_ev __attribute__((weak, visibility("hidden"))); \ extern struct trace_event * const __stop___trace_events_ptrs[] \ __attribute__((weak, visibility("hidden"))); \ + static struct trace_event * const __event_ptrs_dummy \ + __attribute__((used, section("__trace_events_ptrs"))) = NULL; \ static void __attribute__((constructor)) \ __trace_events__init(void) \ { \