[lttng-dev] TP_ARGS for TRACEPOINT_EVENT_CLASS and TRACEPOINT_EVENT_INSTANCE

[Yonghong Yan]

I am looking at the following example from lttng-ust manual. The same
TP_ARGS ( ... ) are repeated in both the TRACEPOINT_EVENT_CLASS and
TRACEPOINT_EVENT_INSTANCE definition. My understanding is that it actually
allows using different arguments, even in this example it is the same. Am I
right?

I also like the feature of having one TP_ARGS in the TRACEPOINT_EVENT_CLASS
that declares the arguments for several TRACEPOINT_EVENT_INSTANCE so we do
not need to have TP_ARGS in TRACEPOINT_EVENT_INSTANCE. Is that possible?

Thank you
Yonghong

TRACEPOINT_EVENT_CLASS(
    my_provider,
    my_tracepoint_class,
    TP_ARGS(
        int, my_integer_arg,
        struct app_struct *, app_struct_arg
    ),
    TP_FIELDS(
        ctf_integer(int, a, my_integer_arg)
        ctf_integer(unsigned long, b, app_struct_arg->b)
        ctf_string(c, app_struct_arg->c)
    )
)

TRACEPOINT_EVENT_INSTANCE(
    my_provider,
    my_tracepoint_class,
    event_instance1,
    TP_ARGS(
        int, my_integer_arg,
        struct app_struct *, app_struct_arg
    )
)

TRACEPOINT_EVENT_INSTANCE(
    my_provider,
    my_tracepoint_class,
    event_instance2,
    TP_ARGS(
        int, my_integer_arg,
        struct app_struct *, app_struct_arg
    )
)

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