[lttng-dev] Writing .tp files for lttng-gen-tp

[Thibault, Daniel]

-----Message d'origine-----
Envoyé : 20 octobre 2014 16:08

Question: why is it required to give the the arguments  to TRACEPOINT_EVENT_INSTANCE since all tracepoints from the same
class use the same arguments and same field layout ?
-----Fin du message d'origine-----

   Simply put, the arguments are part of the signature of the functions that implement the tracepoint.  You can simplify things like this:

[...]
#define thorium_event_args TP_ARGS( \
struct thorium_message *, message \
)

TRACEPOINT_EVENT_CLASS(
thorium_message,
thorium_event_template,
thorium_event_args,
TP_FIELDS(
ctf_integer(int, message_number, message->number) ctf_integer(int, message_action, message->action) ctf_integer(int, message_count, message->count) ctf_integer(int, message_source_actor, message->source_actor) ctf_integer(int, message_destination_actor, message->destination_actor) ctf_integer(int, message_source_node, message->source_node) ctf_integer(int, message_destination_node, message->destination_node)
)
)

TRACEPOINT_EVENT_INSTANCE(
thorium_message,
thorium_event_template,
actor_send,
thorium_event_args
)

TRACEPOINT_EVENT_INSTANCE(
thorium_message,
thorium_event_template,
node_send,
thorium_event_args
)
[...]

Daniel U. Thibault
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