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    SubjectRe: [PATCH 2/3] perf, tool: Enable grouping logic for parsed events
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    On Fri, 29 Jun 2012 11:08:26 +0200, Jiri Olsa wrote:
    > 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 overrides any event modifier settings,
    > for example:
    >
    > # perf record -r '{faults:k,cache-references}:u'
    >
    > resulting in ':u' modifier being used for both 'faults' and 'cache-references'
    > events, regardless of their modifier setup (':k' for faults event).
    >

    So the faults event would get only 'u' for the modifier not 'uk', right?

    Thanks,
    Namhyung



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