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    SubjectRe: [RFC PATCHv3] perf tools: add event grouping capability to "perf stat"
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    On Wed, 2010-11-24 at 17:54 -0800, Corey Ashford wrote:
    > Add the ability to create multiple event groups, each with their own leader
    > using the existing "-e <event>[,<event> ...] [-e <event>[,<event>]]"
    > syntax. Each additional -e switch creates a new group, and each event
    > listed within a -e switch is within that group.
    >
    > Changes since v1:
    > - Because of a flub, v2 did not contain the changes I had intended to make,
    > and instead, v2 had the same patch contents as v1.
    > - When perf stat is not supplied any events on the command line, put
    > each default event in its own group.

    I like this, but could you also extend this to perf-record? its a bit
    odd to diverge between the two.

    Using Stephane's latest syntax changes you could actually do something
    like:

    perf record -e task-clock:freq=1000,cycles:period=0

    Which would create a group with 1 sampling counter and a counting
    counter (at which point we should probably start flipping
    PERF_SAMPLE_READ).

    Matt was working on supporting that (although not through cmdline
    syntax) and teaching perf-report to cope with such output.



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