• David Ahern's avatar
    perf stat: clarify unsupported events from uncounted events · 2cee77c4
    David Ahern authored
    perf stat continues running even if the event list contains counters
    that are not supported. The resulting output then contains <not counted>
    for those events which gets confusing as to which events are supported,
    but not counted and which are not supported.
    
    Before:
    
    perf stat -ddd -- sleep 1
    
          Performance counter stats for 'sleep 1':
    
              0.571283 task-clock                #    0.001 CPUs utilized
                     1 context-switches          #    0.002 M/sec
                     0 CPU-migrations            #    0.000 M/sec
                   157 page-faults               #    0.275 M/sec
             1,037,707 cycles                    #    1.816 GHz
         <not counted> stalled-cycles-frontend
         <not counted> stalled-cycles-backend
               654,499 instructions              #    0.63  insns per cycle
               136,129 branches                  #  238.286 M/sec
         <not counted> branch-misses
         <not counted> L1-dcache-loads
         <not counted> L1-dcache-load-misses
         <not counted> LLC-loads
         <not counted> LLC-load-misses
         <not counted> L1-icache-loads
         <not counted> L1-icache-load-misses
         <not counted> dTLB-loads
         <not counted> dTLB-load-misses
         <not counted> iTLB-loads
         <not counted> iTLB-load-misses
         <not counted> L1-dcache-prefetches
         <not counted> L1-dcache-prefetch-misses
    
           1.001004836 seconds time elapsed
    
    After:
    
    perf stat -ddd -- sleep 1
    
     Performance counter stats for 'sleep 1':
    
              1.350326 task-clock                #    0.001 CPUs utilized
                     2 context-switches          #    0.001 M/sec
                     0 CPU-migrations            #    0.000 M/sec
                   157 page-faults               #    0.116 M/sec
                11,986 cycles                    #    0.009 GHz
       <not supported> stalled-cycles-frontend
       <not supported> stalled-cycles-backend
               496,986 instructions              #   41.46  insns per cycle
               138,065 branches                  #  102.246 M/sec
                 7,245 branch-misses             #    5.25% of all branches
         <not counted> L1-dcache-loads
         <not counted> L1-dcache-load-misses
         <not counted> LLC-loads
         <not counted> LLC-load-misses
         <not counted> L1-icache-loads
         <not counted> L1-icache-load-misses
         <not counted> dTLB-loads
         <not counted> dTLB-load-misses
         <not counted> iTLB-loads
         <not counted> iTLB-load-misses
         <not counted> L1-dcache-prefetches
       <not supported> L1-dcache-prefetch-misses
    
           1.002397333 seconds time elapsed
    
    v1->v2:
    changed supported type from int to bool
    
    v2->v3
    fixed vertical alignment of new struct element
    
    Cc: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Link: http://lkml.kernel.org/r/1306767359-13221-1-git-send-email-dsahern@gmail.com
    
    
    Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
    Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    2cee77c4