I am trying to collect a trace for visualizing callstack using lttng_ust_cyg_profile.
Even though I have compiled a single source file with -finstrument-functions, I guess it is producing too many events to considerably slow down the instrumented process and cause lost events. I am using clang, which does not support -finstrument-functions-exclude-file-list. Is there any way to filter lttng_ust_cyg_profile events before they are written to the trace? I have tried various things: 1. lttng-track to only track one process 2. Only enable lttng_ust_cyg_profile:* events 3. Increase the subbuffer size: lttng enable-channel --userspace --buffers-pid --subbuf-size=2M --num-subbuf=2 mychannel Using this option is very flaky however. It crashes lttng-sessiond. Any other ideas to filter events? I am also open to explicitly adding tracepoints to the functions I care about. But I am not sure how they can be visualized in trace-compass callstack view. I guess it only supports tracepoints generated by lttng_ust_cyg_profile?
_______________________________________________ lttng-dev mailing list lttng-dev@lists.lttng.org https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
