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

[Ramkumar Ramachandra]

Hi,

All the other perf tooling can be used as a normal user. At one point,
I had to touch /proc/sys/kernel/perf_event_paranoid to get me numbers
on a PMU event without a symbolic name, but that's about it.
perf-trace seems to be the exception though:

  artagnon|perf-core=:~/src/linux/tools/perf$ perf trace -a -e open
  Couldn't read the raw_syscalls tracepoints information!

The responsible codepath is:

  if (perf_evlist__add_newtp(evlist, "raw_syscalls", "sys_enter",
trace__sys_enter) ||
     perf_evlist__add_newtp(evlist, "raw_syscalls", "sys_exit",
trace__sys_exit)) {

I don't understand much of what's going on, but what can be done to
improve the situation for users?

Thanks.
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