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[Avik Sil <843628@xxxxxxxxxxxxxxxxxx>]

With 11.12 RC image, perf seems to work fine:

# perf stat sleep 1

 Performance counter stats for 'sleep 1':

         11.810303 task-clock                #    0.011 CPUs utilized          
                 1 context-switches          #    0.000 M/sec                  
                 0 CPU-migrations            #    0.000 M/sec                  
               148 page-faults               #    0.013 M/sec                  
           3514014 cycles                    #    0.298 GHz                    
                 0 stalled-cycles-frontend   #    0.00% frontend cycles idle   
                 0 stalled-cycles-backend    #    0.00% backend  cycles idle   
           1777780 instructions              #    0.51  insns per cycle        
            197443 branches                  #   16.718 M/sec                  
             71889 branch-misses             #   36.41% of all branches        

       1.037902836 seconds time elapsed


** Changed in: linaro-ubuntu
       Status: Confirmed => Fix Committed

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https://bugs.launchpad.net/bugs/843628

Title:
  perf failure on panda (omap4)

Status in Linaro Texas Instruments Landing Team:
  In Progress
Status in Linaro Ubuntu Evaluation Builds:
  Fix Committed
Status in Linaro Linux:
  New
Status in “linux-linaro-omap” package in Ubuntu:
  Confirmed

Bug description:
  Though perf lists the PMU events but fails to gather performance
  counter statistics on panda

  # perf list

  List of pre-defined events (to be used in -e):

    cpu-cycles OR cycles                       [Hardware event]
    instructions                               [Hardware event]
    cache-references                           [Hardware event]
    cache-misses                               [Hardware event]
    branch-instructions OR branches            [Hardware event]
    branch-misses                              [Hardware event]
    bus-cycles                                 [Hardware event]

    cpu-clock                                  [Software event]
    task-clock                                 [Software event]
    page-faults OR faults                      [Software event]
  [...]

  # perf stat sleep 1
    Error: cache-misses event is not supported. 
    Fatal: Not all events could be opened.

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