* [lttng-dev] unable to add callstack-user context
@ 2021-07-09 8:30 Evan Galea via lttng-dev
2021-07-09 13:54 ` Mathieu Desnoyers via lttng-dev
0 siblings, 1 reply; 2+ messages in thread
From: Evan Galea via lttng-dev @ 2021-07-09 8:30 UTC (permalink / raw)
To: lttng-dev
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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.
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
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?
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [lttng-dev] unable to add callstack-user context
2021-07-09 8:30 [lttng-dev] unable to add callstack-user context Evan Galea via lttng-dev
@ 2021-07-09 13:54 ` Mathieu Desnoyers via lttng-dev
0 siblings, 0 replies; 2+ messages in thread
From: Mathieu Desnoyers via lttng-dev @ 2021-07-09 13:54 UTC (permalink / raw)
To: Evan Galea; +Cc: lttng-dev
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----- On Jul 9, 2021, at 4:30 AM, lttng-dev <lttng-dev@lists.lttng.org> wrote:
> 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
> _______________________________________________
> lttng-dev mailing list
> lttng-dev@lists.lttng.org
> https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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