---------------------------------------------------------------------- Date: Wed, 2 Jul 2014 02:02:25 -0400 From: Sandeep K Chaudhary <[email protected]>
> Is it not possible to have two or more trace-point definitions in the same > header file? > > Reading from the manual[1] as > > "There can be an arbitrary number of tracepoint providers within an > application, but they must each have their own provider name. Duplicate > provider names are not allowed.", > >I get the idea that it is not possible since each tracepoint provider >needs to have unique name, and therefore, should be in a different >header file. > >Please confirm if this is the case. > > It would be much better for me if it is possible to have multiple > trace-point definitions in the same header file. > > [1] https://lttng.org/files/doc/man-pages/man3/lttng-ust.3.html Each tracepoint provider can provide a number of tracepoints. Ideally, each tracepoint header should cover a single tracepoint provider -otherwise you'd end up with two tracepoint providers in lockstep, which is much the same as regrouping their tracepoints under a single tracepoint provider, except with extra overhead. Think of the tracepoint provider as the shared object that implements its tracepoints. It is a container for tracepoints, very much like a file system. You can have two different tracepoints bearing the same name (identifier) as long as they are in different tracepoint providers, very much like you can have two different files with the same name as long as they are in different folders. I hope this clarifies things. Daniel U. Thibault Protection des systèmes et contremesures (PSC) | Systems Protection & Countermeasures (SPC) Cyber sécurité pour les missions essentielles (CME) | Mission Critical Cyber Security (MCCS) RDDC - Centre de recherches de Valcartier | DRDC - Valcartier Research Centre 2459 route de la Bravoure Québec QC G3J 1X5 CANADA Vox : (418) 844-4000 x4245 Fax : (418) 844-4538 NAC : 918V QSDJ <http://www.travelgis.com/map.asp?addr=918V%20QSDJ> Gouvernement du Canada | Government of Canada <http://www.valcartier.drdc-rddc.gc.ca/> _______________________________________________ lttng-dev mailing list [email protected] http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
