Hi there, I'm a little new to lttng and tracing in general. I am using a Java Userspace agent, which is working well, but I am having trouble adding callstack context to my tracing channels. I'm not sure if it's relevant but running 'lttng add-context --list" shows callstack-user in the list.
It's not surprising, because the callstack-user context is specific to the kernel tracer.
the commands I input are:
lttng create
lttng enable-channel --userspace mychannel
lttng enable-event --userspace --all --channel mychannel
lttng add-context --userspace --channel mychannel --type callstack-user
>Error: callstack-user: UST invalid context
This is expected.
When I run the following command instead:
lttng add-context --userspace --channel mychannel --type vpid
I am able to get it to work and I see vpid appear in my traces. Are there any other things I need to set up first to be able to use it?
also, are there any commands that can list the per-domain contexts available?
Not currently, though I think it would make sense to make "lttng add-context --list" allow a tracing domain
(e.g. --kernel/--userspace) to be specified as a future improvement.
Some information about this is available in the lttng-add-context(1) man page, but the fact that the
kernel and user callstack contexts are only supported by the kernel tracer don't seem to be mentioned.
Thanks,
Mathieu
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