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Re: [tracecompass-dev] XML analysis on both ust and kernel lttng traces
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Hi Zeno,
Thanks for your interest in the XML analysis.
To answer your question: It is not possible to access another state
provider while building a state provider. But you can build an XML
analysis for an experiment by setting the trace type to that of the
experiment: org.eclipse.linuxtools.tmf.core.experiment.generic
But in your specific case, if what you are looking for is the thread ID,
then there is a special eventField, 'tid' that you may use to find that
information wherever it is possible to find it, ie in your kernel trace.
So here you should replace the query CPU:cpu state attribute by a
stateAttribute of type eventField and value tid and you'll find it. But
make sure that the kernel trace has been opened and its analyses completed
before running the analysis.
Best regards,
Geneviève
On Tue, September 12, 2017 3:49 am, Zeno Endemann wrote:
> Hello,
>
>
> I'd like to combine kernel and ust events in the analysis - is it
> possible?
>
> As an example, I'd like to recover the information which thread caused a
> ust event (yes I know about lttng add-context --userspace --type=vtid, but
> let's assume this is not available). I tried the following, which didn't
> work for me (inside the same tmfxml element):
>
> <stateProvider id="foo1" version="1">
> <head>
> <traceType id="org.eclipse.linuxtools.lttng2.kernel.tracetype" />
> <label value="CPU TID map" />
> </head>
> <eventHandler eventName="sched_switch">
> <stateChange>
> <stateAttribute type="constant" value="CPUs" />
> <stateAttribute type="eventField" value="cpu" />
> <stateValue type="eventField" value="next_tid"/>
> </stateChange>
> </eventHandler>
> </stateProvider>
>
>
> <stateProvider id="foo2" version="1">
> <head>
> <traceType id="org.eclipse.linuxtools.lttng2.ust.tracetype" />
> <label value="UST Analysis" />
> </head>
> <eventHandler eventName="ust_myprog:event1">
> <stateChange>
> <stateAttribute type="constant" value="Threads" />
> <stateAttribute type="query">
> <stateAttribute type="constant" value="CPUs" />
> <stateAttribute type="eventField" value="cpu" />
> </stateAttribute>
> <stateValue type="int" value="..." />
> </stateChange>
> </eventHandler>
> </stateProvider>
>
>
> So I guess a stateProvider cannot access the state of another provider?
> Can I maybe define a single stateProvider on an Experiment (where I have
> both ust and kernel events combined)? Any other alternative?
>
> Thanks for any info!
>
>
> --
> Zeno Endemann | zeno.endemann@xxxxxxxx | Software Engineer
> KDAB (Deutschland) GmbH&Co KG, a KDAB Group company
> Tel: +49-30-521325470
> KDAB - The Qt Experts
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