• Arnaldo Carvalho de Melo's avatar
    perf tools: Use rb_tree for maps · 1b46cddf
    Arnaldo Carvalho de Melo authored
    Threads can have many and kernel modules will be represented as a
    tree of maps as well.
    
    Ah, and for a perf.data with 146607 samples:
    
    Before:
    
    [root@doppio ~]# perf stat -r 5 perf report > /dev/null
    
     Performance counter stats for 'perf report' (5 runs):
    
         699.823680  task-clock-msecs         #      0.991 CPUs    ( +-   0.454% )
                 74  context-switches         #      0.000 M/sec   ( +-   1.709% )
                  2  CPU-migrations           #      0.000 M/sec   ( +-  17.008% )
              23114  page-faults              #      0.033 M/sec   ( +-   0.000% )
         1381257019  cycles                   #   1973.721 M/sec   ( +-   0.290% )
         1456894438  instructions             #      1.055 IPC     ( +-   0.007% )
           18779818  cache-references         #     26.835 M/sec   ( +-   0.380% )
             641799  cache-misses             #      0.917 M/sec   ( +-   1.200% )
    
        0.705972729  seconds time elapsed   ( +-   0.501% )
    
    [root@doppio ~]#
    
    After
    
     Performance counter stats for 'perf report' (5 runs):
    
         691.261451  task-clock-msecs         #      0.993 CPUs    ( +-   0.307% )
                 72  context-switches         #      0.000 M/sec   ( +-   0.829% )
                  6  CPU-migrations           #      0.000 M/sec   ( +-  18.409% )
              23127  page-faults              #      0.033 M/sec   ( +-   0.000% )
         1366395876  cycles                   #   1976.670 M/sec   ( +-   0.153% )
         1443136016  instructions             #      1.056 IPC     ( +-   0.012% )
           17956402  cache-references         #     25.976 M/sec   ( +-   0.325% )
             661924  cache-misses             #      0.958 M/sec   ( +-   1.335% )
    
        0.696127275  seconds time elapsed   ( +-   0.377% )
    
    I.e. we see some speedup too.
    Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Frédéric Weisbecker <fweisbec@gmail.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Mike Galbraith <efault@gmx.de>
    Cc: "H. Peter Anvin" <hpa@zytor.com>
    LKML-Reference: <20090928174846.GA3361@ghostprotocols.net>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    1b46cddf
event.h 1.79 KB