PERF_EVENT_IOC_SET_OUTPUT

[Adrian Hunter]

Hi

It does not seem possible to use set-output between
task contexts of different types (e.g. a software event
to a hardware event)

If you look at perf_event_set_output():

          /*
           * If its not a per-cpu rb, it must be the same task.
           */
          if (output_event->cpu == -1 && output_event->ctx != event->ctx)
                  goto out;

ctx (perf_event_context) won't be the same for events
of different types.  Is this restriction necessary?

Regards
Adrian
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