Re: [PATCH 1/5] ftrace: Synchronize variable setting with breakpoints

[Arnaldo Carvalho de Melo]

Em Thu, May 31, 2012 at 10:26:09PM +0200, Peter Zijlstra escreveu:
> > Hmm, this brings up another question. By default, perf does not allow
> > users to profile trace_events correct? IOW, perf does not let
> > unprivileged users call text_poke()? I just tried it and got the:
> > 
> > $ ~/bin/perf record -e sched:sched_switch sleep 1
> > Permission error - are you root?
> > Consider tweaking /proc/sys/kernel/perf_event_paranoid:
> >  -1 - Not paranoid at all
> >   0 - Disallow raw tracepoint access for unpriv
> >   1 - Disallow cpu events for unpriv
> >   2 - Disallow kernel profiling for unpriv
> 
> It would, except tools/perf does stupid, its unconditionally adding
> PERF_SAMPLE_RAW (even for non-sampling events), which is the bit that
> requires privs.

Looserland, bah, I'll check that, thanks.

- Arnaldo
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