On Fri, Feb 20, 2015 at 2:20 PM, Alexandre Montplaisir <[email protected]> wrote: > > On 02/20/2015 02:05 PM, Philippe Proulx wrote: >> >> On Fri, Feb 20, 2015 at 2:00 PM, Anand Neeli <[email protected]> >> wrote: >>> >>> Hi All, >>> Is adding a new channel to an existing(running) session supported? >> >> No. >>> >>> i get following error when doing this. >>> Error: Channel myc5: Tracing already started >>> >>> Is there any way to add channels on the fly? >> >> No. LTTng's documentation [1] states: >> >> Note: Because of a current limitation, all channels must be >> created prior to beginning tracing in a given tracing session, >> i.e. before the first time you do lttng start. > > > The wording "Because of a current limitation" seems to imply that it could > and will eventually be rectified. It this actually the case, or is the doc > just giving the user false hope? ;)
The feature is planned to be completed before 2038; no false hope here. On a more serious note, it is definitely possible, although not so trivial to implement. But since it is achievable, given enough time that is, it is actually... a current limitation. Phil > > > Alex > > >> >> Since a channel is automatically created by enable-event >> only for the specified domain, you cannot, for example, enable >> a kernel domain event, start tracing and then enable a user >> space domain event because no user space channel exists >> yet and it's too late to create one. >> >> For this reason, make sure to configure your channels >> properly before starting the tracers for the first time! >> >> Phil >> >> [1] http://lttng.org/docs/#doc-enabling-disabling-channels >> >>> I'm using 2.4.1 version >>> >>> Thanks, >>> Anand Neeli >>> >>> _______________________________________________ >>> lttng-dev mailing list >>> [email protected] >>> http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev >>> >> _______________________________________________ >> lttng-dev mailing list >> [email protected] >> http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev > > _______________________________________________ lttng-dev mailing list [email protected] http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
