Ubuntu
linux package

  1. Bug #1861359
  2. Comment #39

Comment 39 for bug 1861359

Revision history for this message
Andrea Righi (arighi) wrote :

Weird that kprobe-perf isn't working... I've just tried it on a fresh new installed 20.04 instance and:

ubuntu@ubuntu:~$ uname -a
Linux ubuntu 5.4.0-12-generic #15-Ubuntu SMP Tue Jan 21 15:12:29 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
ubuntu@ubuntu:~$ sudo ls -l /sys/kernel/debug/tracing/available_filter_functions
-r--r--r-- 1 root root 0 Feb 12 11:32 /sys/kernel/debug/tracing/available_filter_functions
ubuntu@ubuntu:~$ sudo kprobe-perf -s 'p:shrink_node'
Tracing kprobe shrink_node. Ctrl-C to end.
^C
Ending tracing...
ubuntu@ubuntu:~$

Are we using a different kernel?

What are your kernel .config options about ftrace (grep FTRACE /boot/config-`uname -r`)?