Hi, On Thu, Jun 01, 2017 at 12:49:50PM +0000, Deneau, Tom wrote: > Using, lttng 2.9.4 > > Doing combined kernel and usermode tracing and then looking at the combined > trace with babeltrace... > I have noticed there is often a period at the beginning of the combined trace > which is all kernel events and similarly a period at the end of the combined > trace which is all userspace events. > > I suppose I can just search for the section in the middle where both channels > are active but is there any way to eliminate the single-channel sections at > the beginning and end?
There is no automatic way to do this as of today. A manual alternative would be to seek to the point of interest and make babeltrace start/end there. Unfortunately, babeltrace 1.5 does not support seeking to a position via the command line. The long awaited Babeltrace 2 should allow easy seeking to your point of interest. > > Also, is it guaranteed that once I get to the section where both channels > appear active in the trace that I will be seeing all events in the combined > trace? Not sure what you mean here. As long as you do not have discarded events at production Babeltrace will show all events from both traces(ust & kernel) in orders based on clock. Cheers > > -- Tom Deneau > _______________________________________________ > lttng-dev mailing list > [email protected] > https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev -- Jonathan Rajotte-Julien EfficiOS _______________________________________________ lttng-dev mailing list [email protected] https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
