When I enable a tracing event (eg kmem) and try and copy the trace file from /sys/kernel/debug/tracing on my Raspberry Pi to my Ubuntu laptop using scp, the tracefile comes to my laptop as an empty file. When I copy a file from my home directory on the RasPi to my laptop with the same scp command, it works.
I have tried changing the permissions of the /sys/kernel/debug/tracing directory using chmod o+rwx . but this makes no difference. I have also tried copying the trace file into the ~ directory on my RasPi, but this takes too long to copy over.
I'm not sure why the trace file is coming as an empty file even after I apply chmod to the directory, maybe scp doesn't work for trace files or something?