perf: regression with PERF_EVENT_IOC_REFRESH

[Vince Weaver]

Hello

the changeset 2e939d1d   perf: Limit event refresh to sampling event

changes the behavior of
  ioctl( , PERF_EVENT_IOC_REFRESH, )

before the changeset, you could have a counter group where only one of the 
subevents was sampling.  PERF_EVENT_IOC_REFRESH would correctly enable 
sampling for only that subevent.

With the changeset applied, this fails with EINVALID.  Now you can only 
sample in a group leader.

Was this an intended change?  It breaks various of our PAPI regression 
tests that worked fine before the change was committed.

Vince
vweaver1@xxxxxxxxxxxx
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