$ uname -a Linux millbarge 5.4.0-12-generic #15-Ubuntu SMP Tue Jan 21 15:12:29 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux $ cat /proc/sys/kernel/ftrace_enabled 1 $ sudo kprobe-perf -s 'p:shrink_node' [sudo] password for sarnold: ERROR: func shrink_node not in /sys/kernel/debug/tracing/available_filter_functions. Either it doesn't exist, or, it might be unsafe to kprobe. Exiting. Use -F to override. $ sudo kprobe-perf -F -s 'p:shrink_node' Tracing kprobe shrink_node. Ctrl-C to end. /usr/sbin/kprobe-perf: line 227: current_tracer: Permission denied /usr/sbin/kprobe-perf: line 228: kprobe_events: Permission denied ERROR: adding kprobe "p:shrink_node shrink_node". Last 2 dmesg entries (might contain reason): [1039094.850875] usb 1-4.4.1.3: Manufacturer: u-blox AG - www.u-blox.com [1039094.860068] cdc_acm 1-4.4.1.3:1.0: ttyACM1: USB ACM device Exiting.
Does the /proc/sys/kernel/ftrace_enabled output need a new bug report? Thanks -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1861359 Title: swap storms kills interactive use To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1861359/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs