• J
    perf tools: Enable grouping logic for parsed events · 6a4bb04c
    Jiri Olsa 提交于
    This patch adds a functionality that allows to create event groups
    based on the way they are specified on the command line. Adding
    functionality to the '{}' group syntax introduced in earlier patch.
    
    The current '--group/-g' option behaviour remains intact. If you
    specify it for record/stat/top command, all the specified events
    become members of a single group with the first event as a group
    leader.
    
    With the new '{}' group syntax you can create group like:
      # perf record -e '{cycles,faults}' ls
    
    resulting in single event group containing 'cycles' and 'faults'
    events, with cycles event as group leader.
    
    All groups are created with regards to threads and cpus. Thus
    recording an event group within a 2 threads on server with
    4 CPUs will create 8 separate groups.
    
    Examples (first event in brackets is group leader):
    
      # 1 group (cpu-clock,task-clock)
      perf record --group -e cpu-clock,task-clock ls
      perf record -e '{cpu-clock,task-clock}' ls
    
      # 2 groups (cpu-clock,task-clock) (minor-faults,major-faults)
      perf record -e '{cpu-clock,task-clock},{minor-faults,major-faults}' ls
    
      # 1 group (cpu-clock,task-clock,minor-faults,major-faults)
      perf record --group -e cpu-clock,task-clock -e minor-faults,major-faults ls
      perf record -e '{cpu-clock,task-clock,minor-faults,major-faults}' ls
    
      # 2 groups (cpu-clock,task-clock) (minor-faults,major-faults)
      perf record -e '{cpu-clock,task-clock} -e '{minor-faults,major-faults}' \
       -e instructions ls
    
      # 1 group
      # (cpu-clock,task-clock,minor-faults,major-faults,instructions)
      perf record --group -e cpu-clock,task-clock \
       -e minor-faults,major-faults -e instructions ls perf record -e
    '{cpu-clock,task-clock,minor-faults,major-faults,instructions}' ls
    
    It's possible to use standard event modifier for a group, which spans
    over all events in the group and updates each event modifier settings,
    for example:
    
      # perf record -r '{faults:k,cache-references}:p'
    
    resulting in ':kp' modifier being used for 'faults' and ':p' modifier
    being used for 'cache-references' event.
    Reviewed-by: NNamhyung Kim <namhyung@kernel.org>
    Signed-off-by: NJiri Olsa <jolsa@redhat.com>
    Acked-by: NPeter Zijlstra <peterz@infradead.org>
    Cc: Andi Kleen <andi@firstfloor.org>
    Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
    Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
    Cc: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Ulrich Drepper <drepper@gmail.com>
    Link: http://lkml.kernel.org/n/tip-ho42u0wcr8mn1otkalqi13qp@git.kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
    6a4bb04c
parse-events.h 3.4 KB