From: Mathieu Desnoyers via lttng-dev <lttng-dev@lists.lttng.org>
To: Evan Galea <evanjamesgalea@gmail.com>
Cc: lttng-dev <lttng-dev@lists.lttng.org>
Subject: Re: [lttng-dev] unable to add callstack-user context
Date: Fri, 9 Jul 2021 09:54:35 -0400 (EDT) [thread overview]
Message-ID: <482770069.11167.1625838875359.JavaMail.zimbra@efficios.com> (raw)
In-Reply-To: <CAA+-46q3vLWvu6WNueSybHZ-7hE=S=eZo1WWXDDq7YOa7hyjWg@mail.gmail.com>
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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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prev parent reply other threads:[~2021-07-09 13:54 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
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 [this message]
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