Call stack context for user space trace points

["Sunku, Sai via lttng-dev" <lttng-dev@lists.lttng.org>]

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Hello,

I have a complex, multithreaded benchmark that emits LTTng trace points at various stages. I am trying to trace all malloc calls made by this benchmark. I'm specifically trying to get malloc trace points also through LTTng so that I can identify when the malloc call was made relative to other trace points from the benchmark. I also want to see the stack trace for each malloc call so that I can identify where in the benchmark the malloc call is coming from.

If I preload the lttng libc wrapper with `LD_PRELOAD=liblttng-ust-libc-wrapper.so`, I'm able to see the trace points from malloc calls.

But when I try to add the callstack-user context with this command `lttng add-context --userspace --channel 1 --type callstack-user`, I get an error saying "Error: callstack-user: UST invalid context"

I've successfully added user space stack traces for kernel trace points with a similar command `lttng add-context --kernel --type callstack-user`

Is the callstack-user context only available for kernel trace points? Is there another way to get the call stack for malloc calls?

Thank you,
Sai Sunku


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