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    SubjectRe: [PATCH 3/3] perf, tool: Add new event group management
    Em Wed, Mar 21, 2012 at 11:42:14AM +0100, Jiri Olsa escreveu:
    > On Tue, Mar 20, 2012 at 07:44:41PM +0100, Peter Zijlstra wrote:
    > > If so, we need some option like:
    > >
    > > perf record -e "{cpu-clock,cache-misses,cache-references}:1"
    > >
    > > to mean, only sample on cpu-clock but use PERF_SAMPLE_READ and
    > > PERF_FORMAT_GROUP to read all siblings on every cpu-clock sample.
    > >
    > > Now the disadvantage is that {} needs quotes on bash, the advantage is
    > > that its completely natural on how to construct groups, without weird
    > > --group/--group parsed. Also it provides a place for group modifiers.
    >
    > how about '=group' keyword followed by ':' modifier
    > perf record -e "cpu-clock,cache-misses,cache-references=group:1"
    >
    > or '=$groupname' and use the group name in output like
    > perf stat -e "task-clock,context-switches=krava:1" ls
    >
    > Performance counter stats for 'ls':
    >
    > 1.003695 task-clock/krava # 0.083 CPUs utilized
    > 0 context-switches/krava # 0.000 K/sec
    >

    Humm, interesting, perhaps putting the group name before the =event_list
    will be more intuitive?

    I.e.:

    perf stat -e "krava=task-clock,context-switches:1" ls

    - Arnaldo


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