• Frederic Weisbecker's avatar
    perf tools: Improve thread comm resolution in perf sched · 9a92b479
    Frederic Weisbecker authored
    When we get sched traces that involve a task that was already
    created before opening the event, we won't have the comm event for
    it.
    
    So if we can't find the comm event for a given thread, we look at
    the traces that may contain these informations.
    
    Before:
    
     ata/1:371             |      0.000 ms |        1 | avg: 3988.693 ms | max: 3988.693 ms |
     kondemand/1:421       |      0.096 ms |        3 | avg:  345.346 ms | max: 1035.989 ms |
     kondemand/0:420       |      0.025 ms |        3 | avg:  421.332 ms | max:  964.014 ms |
     :5124:5124            |      0.103 ms |        5 | avg:   74.082 ms | max:  277.194 ms |
     :6244:6244            |      0.691 ms |        9 | avg:  125.655 ms | max:  271.306 ms |
     firefox:5080          |      0.924 ms |        5 | avg:   53.833 ms | max:  257.828 ms |
     npviewer.bin:6225     |     21.871 ms |       53 | avg:   22.462 ms | max:  220.835 ms |
     :6245:6245            |      9.631 ms |       21 | avg:   41.864 ms | max:  213.349 ms |
    
    After:
    
     ata/1:371             |      0.000 ms |        1 | avg: 3988.693 ms | max: 3988.693 ms |
     kondemand/1:421       |      0.096 ms |        3 | avg:  345.346 ms | max: 1035.989 ms |
     kondemand/0:420       |      0.025 ms |        3 | avg:  421.332 ms | max:  964.014 ms |
     firefox:5124          |      0.103 ms |        5 | avg:   74.082 ms | max:  277.194 ms |
     npviewer.bin:6244     |      0.691 ms |        9 | avg:  125.655 ms | max:  271.306 ms |
     firefox:5080          |      0.924 ms |        5 | avg:   53.833 ms | max:  257.828 ms |
     npviewer.bin:6225     |     21.871 ms |       53 | avg:   22.462 ms | max:  220.835 ms |
     npviewer.bin:6245     |      9.631 ms |       21 | avg:   41.864 ms | max:  213.349 ms |
    Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Mike Galbraith <efault@gmx.de>
    Cc: Paul Mackerras <paulus@samba.org>
    LKML-Reference: <1255012632-7882-1-git-send-email-fweisbec@gmail.com>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    9a92b479
thread.h 1.19 KB