On 14 August 2018 at 08:06, jagadeesh konakalla <kjagadees...@gmail.com> wrote: > Hi Mathieu, > > This is Jagadeesh. I am user of lttng tools. > > I have one query regarding the lttng ust usage. > > I have written my linux application which has trace point API's to trace the > user application. > My requirement is to do both kernel domain trace and user domain trace for > my application. > > When i start the lttng and then run my application, i do not see any issues. > I mean to say that i get all the user trace events and kernel events. > > If i start the application, then i configure and start the lttng, i see some > user events are not captured at the start (may be dropped). I have observed > that there is a delay in the first kernel event occurrence to first user > event occurrence. I have not seen this behavior if i start the lttng and run > my application.
Hi, It is expected for the kernel tracer to start tracing before the user space tracer during the execution of the start command. Starting the tracing across domains is not done in a single operation. LTTng guarantees that all events that occur after the 'lttng start' command returns will be captured (provided that the buffers are not full). Jérémie > > Here is my question : Is this the expected behavior ? > or > Are there any settings that can help me to resolve this issue ? > > Version of lttng used : > lttng-tools (2.9.4) > lttng-modules (2.9.1) > lttng-libust (2.9.0 ) > > I appreciate your help. Please let me know if you need more information. > > With regards, > Jagadeesh K. > > _______________________________________________ > lttng-dev mailing list > lttng-dev@lists.lttng.org > https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev > -- Jérémie Galarneau EfficiOS Inc. http://www.efficios.com _______________________________________________ lttng-dev mailing list lttng-dev@lists.lttng.org https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
