Hi, Looks ebpf trace doesn't work during cpu hotplug, see the following trace:
1) trace two functions called during CPU unplug via bcc/trace /usr/share/bcc/tools/trace -T 'takedown_cpu "%d", arg1' 'take_cpu_down' 2) put cpu7 offline via: echo 0 > /sys/devices/system/cpu/cpu7/online 3) only trace on 'takedown_cpu' is dumped via bcc/trace: TIME PID TID COMM FUNC - 03:23:17 733 733 bash takedown_cpu 7 The lost trace on 'take_cpu_down' can never be shown, even though CPU7 is switched ON again. take_cpu_down is called via stop_machine_cpuslocked. Thanks, Ming Lei
