Re: [QUERY] Why does perf-trace need me to be root?

[Ingo Molnar]

* Ramkumar Ramachandra <artagnon@xxxxxxxxx> wrote:

> David Ahern wrote:
> > If you trust your users make the debugfs mount point rx by group,world.
> 
> Thanks David. I can preserve this configuration across reboots by
> putting an entry in fstab, right? How do I preserve the value of
> /proc/sys/kernel/perf_event_paranoid across reboots?

via:

   echo 'kernel.perf_event_paranoid = -1' >> /etc/sysctl.conf

I think 'perf trace' should probably print such suggestions when it 
notices a privilege problem, to make it far more obvious for new users to 
correctly configure their system for easy tracing.

The current output:

  comet:~/tip> perf trace
  Couldn't read the raw_syscalls tracepoints information!

is as hostile to the user as it gets ;-)

Thanks,

	Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/