[lttng-dev] Is it possible to disable recording the CPU id for USTs?

Aditya Kurdunkar via lttng-dev <[email protected]> Tue, 18 Jun 2024 18:25:50 +0530

Newsgroups	org.lttng.lists.lttng-dev
Message-ID	<CAFV=bv=hp9n8fCxxWjHn_wKQZHyAizDzVbSkVhvjNJSE_LrmEQ@mail.gmail.com>

Hello,

Please bear with me if this is a naive question. I am working on an
embedded ARM chip (1GB ram, 2CPUs) where I want to collect trace events for
a long duration of time. From the research that I have done (mostly reading
papers on LTTng tracing, conference talks and documentation) I have seen it
mentioned that for ARM the overhead is greater because the system call to
get the CPU is quite slow. In my use case I am okay with not having  this
information. The current benchmarks show a 3 microsecond overhead of a
single tracepoint on ARM in comparison to 150ns on a x86 machine. Hence, my
question is: Is it possible to disable recording the CPU somehow? Any
suggestions for decreasing the overhead other than this are welcome.

Regards,
Aditya

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