• Stephane Eranian's avatar
    perf stat: Add per processor socket count aggregation · d7e7a451
    Stephane Eranian authored
    This patch adds per-processor socket count aggregation for system-wide
    mode measurements. This is a useful mode to detect imbalance between
    sockets.
    
    To enable this mode, use --aggr-socket in addition
    to -a. (system-wide).
    
    The output includes the socket number and the number of online
    processors on that socket. This is useful to gauge the amount of
    aggregation.
    
     # ./perf stat -I 1000 -a --aggr-socket -e cycles sleep 2
     #           time socket cpus             counts events
          1.000097680 S0        4          5,788,785 cycles
          2.000379943 S0        4         27,361,546 cycles
          2.001167808 S0        4            818,275 cycles
    Signed-off-by: default avatarStephane Eranian <eranian@google.com>
    Cc: Andi Kleen <ak@linux.intel.com>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Jiri Olsa <jolsa@redhat.com>
    Cc: Namhyung Kim <namhyung.kim@lge.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Link: http://lkml.kernel.org/r/1360161962-9675-3-git-send-email-eranian@google.com
    [ committer note: Added missing man page entry based on above comments ]
    Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    d7e7a451
perf-stat.txt 4.26 KB