perf counts nothing on SPARC

[ééä <chenwj@xxxxxxxxxxxxxxxxx>]

Hi, all

  I don't know this is normal or not. But I got nothing when I
ran `perf` on a SPARC machine. For example,

$ perf stat -e instructions git gc
Nothing new to pack.

 Performance counter stats for 'git gc':

                 0 instructions             #      0.000 IPC

        0.188904740  seconds time elapsed

  I think there should be more than 1 instruction at least. But
as you can see from the example, I got zero instruction while
running `git gc`.

  Any idea?

Regards,
chenwj

-- 
Wei-Ren Chen (ééä)
Parallel Processing Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
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