gernot@tintenfass:~# lockstat -kIW -D 20 sleep 30

Profiling interrupt: 5844 events in 30.123 seconds (194 events/sec)

Count indv cuml rcnt     nsec Hottest CPU+PIL        Caller                  
-------------------------------------------------------------------------------
 2649  45%  45% 0.00     1070 cpu[1]                 i86_mwait               
  358   6%  51% 0.00      963 cpu[0]                 AcpiDebugPrint          
  333   6%  57% 0.00      960 cpu[0]                 AcpiUtTrackStackPtr     
  228   4%  61% 0.00      972 cpu[0]                 AcpiExNameSegment       
  221   4%  65% 0.00     1239 cpu[1]+9               inb                     
  210   4%  68% 0.00      976 cpu[0]                 AcpiNsGetNextNode       
  123   2%  71% 0.00      922 cpu[0]                 AcpiUtMemset            
  105   2%  72% 0.00      941 cpu[0]                 AcpiNsGetParentNode     
   94   2%  74% 0.00      969 cpu[0]                 AcpiNsDeleteNamespaceByOwner
   87   1%  75% 0.00     1198 cpu[1]                 outb                    
   67   1%  77% 0.00      973 cpu[0]                 mutex_enter             
   60   1%  78% 0.00     1119 cpu[0]                 do_splx                 
   59   1%  79% 0.00      900 cpu[0]                 AcpiUtTrace             
   55   1%  80% 0.00      911 cpu[0]                 AcpiUtStatusExit        
   53   1%  80% 0.00      976 cpu[0]                 AcpiNsLookup            
   52   1%  81% 0.00      904 cpu[0]                 AcpiNsSearchOneScope    
   50   1%  82% 0.00     1254 cpu[1]+9               inw                     
   50   1%  83% 0.00      945 cpu[0]                 AcpiNsCheckForPredefinedName
   45   1%  84% 0.00      989 cpu[0]                 AcpiUtTracePtr          
   29   0%  84% 0.00      933 cpu[0]                 AcpiPsGetNextNamestring 
-------------------------------------------------------------------------------