Re: [lttng-dev] Record stacktraces at userspace tracing domain

["Christophe Bédard via lttng-dev" <lttng-dev@lists.lttng.org>]

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Hi,

I did the same thing a while ago, i.e., trigger tracepoints on
malloc/free/etc. using liblttng-ust-libc-wrapper and collect userspace
callstack information (so that the indirect calls to malloc/free can be
removed from an application).

There is a userspace callstack context implementation here for lttng-ust
2.10, see the last 3 commits:
https://github.com/tahini/lttng-ust-1/commits/ust-callstack-2.10/. Here's
the corresponding lttng-tools 2.10 branch needed to enable the userspace
callstack context:
https://github.com/tahini/lttng-tools/commits/ust-context-callstack/.

I've rebased it on 2.11 here:
https://github.com/ApexAI/lttng-ust/commits/ust-callstack-2.11/.
lttng-tools:
https://github.com/ApexAI/lttng-tools/commits/ust-callstack-2.11/. It
shouldn't be too hard to rebase it all on a newer version.

Hope that helps,

Christophe

On Mon, Dec 2, 2024 at 8:32 AM Alexander Krabler via lttng-dev <
lttng-dev@lists.lttng.org> wrote:

> Hello,
>
> we want to record stacktraces at specific userspace events like e.g. calls
> to malloc and free using liblttng-ust-libc-wrapper.so.
> There is the callstack-user context to achieve this in general, however,
> it seems like tracing of userspace stacktraces is only available in the
> kernel tracing domain.
>
> Is there already a solution to achieve this goal?
> If not, what would need to be done to achieve this?
>
> Thanks,
> Alexander

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