Comment 41 for bug 1861359

Ah! You're right, that's the reason! When the kernel is locked down ftrace is explicitly disabled. To confirm that, you should have 0 in /proc/sys/kernel/ftrace_enabled.

Can you try to set it back to 1 and see if kprobe-perf works after that? Otherwise I'll figure out an alternative way to trace down the swapping issue. Thanks.