[lttng-dev] lttng snapshots and running traces

Julien Desfossez julien.desfossez at efficios.com
Thu Sep 26 11:21:44 EDT 2013


On 13-09-25 05:31 PM, Thibault, Daniel wrote:
>    Conversely, if the session daemon catches up to the consumer daemon during an 'lttng snapshot record' action, what happens?  Does the session daemon wait for the consumer to be done?  Does the session daemon force the consumer to wrap up prematurely?  (Assuming flight recorder mode, of course)
Already answered in my previous mail.

>    If a snapshot session is in discard mode, am I right in supposing it just stops tracing once the buffers are full?  Does a record action "clear" the buffers for re-use then?
No, currently there is no way to clear the ring buffer for reuse, so
indeed in discard mode once the buffer is full, it stops recording
events. That is why we default to override mode (flight recorder) in



> 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)
> R & D pour la défense Canada - Valcartier (RDDC Valcartier) | Defence R&D Canada - Valcartier (DRDC Valcartier)
> 2459 route de la Bravoure
> Québec QC  G3J 1X5
> 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
> lttng-dev at lists.lttng.org
> http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev

More information about the lttng-dev mailing list