perf: odd event scheduling issue

[Vince Weaver]

Hello

so I'm running 4.1-rc4 on my Haswell machine and a lot of my perf_event 
testsuite is failing.  There seems to be weird event scheduling issues.

I can reproduce it with plain perf; simple event groups that should work 
fine can't be scheduled.

vince@haswell:~$ perf stat -e \{cycles,instructions\} sleep 1

 Performance counter stats for 'sleep 1':

     <not counted>      cycles                   
     <not counted>      instructions             

       1.003414661 seconds time elapsed

I just wanted to check to see if this was a known problem before I started 
bisecting.  I was also possibly seeing this with 4.1-rc2.

Vince
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