Just to be clear, not *all* tracing tools work, but this is much better:
sarnold@millbarge:/tmp$ uname -a
Linux millbarge 5.4.0-21-generic #25-Ubuntu SMP Sat Mar 28 13:10:28 UTC 2020
x86_64 x86_64 x86_64 GNU/Linux
sarnold@millbarge:/tmp$ sudo zfsslower-bpfcc
Traceback (most recent call last):
File "/usr/sbin/zfsslower-bpfcc", line 265, in <module>
if BPF.get_kprobe_functions(b'zpl_iter'):
File "/usr/lib/python3/dist-packages/bcc/__init__.py", line 539, in
get_kprobe_functions
with open("%s/../kprobes/blacklist" % TRACEFS, "rb") as blacklist_f:
PermissionError: [Errno 1] Operation not permitted:
'/sys/kernel/debug/tracing/../kprobes/blacklist'
Thanks
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https://bugs.launchpad.net/bugs/1862708
Title:
tracing doesn't work on focal
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