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    SubjectRe: perf record: can I specify multiple events and use different sample-after value
    On 2/27/12 6:58 AM, Yuanfang Chen wrote:
    > On Mon, Feb 27, 2012 at 8:56 AM, Yuanfang Chen<cyfmxc@gmail.com> wrote:
    >>
    >> On Feb 26, 2012 10:23 PM, "David Ahern"<dsahern@gmail.com> wrote:
    >>>
    >>> On 2/24/12 3:41 PM, Yuanfang Chen wrote:
    >>>>
    >>>> I think I'll settle with perf record for now. Still, unlike trace
    >>>> event, sample count is not meaningful for PMU event. Output of "perf
    >>>> script" does not include period value. One line of code will do the
    >>>> work.
    >>>>
    >>>> lude 17342 750118.202915: raw 0x3c: 86754 ffffffff8115f6b9
    >>>> __mem_cgroup_commit_char
    >>>> lude 17342 750118.203025: raw 0x3c: 1027634 ffffffff811344b9
    >>>> __mem_cgroup_commit_char
    >>>>
    >>>> 86754, 1027634 is the period value. But I'm not sure which is the PMU
    >>>> value, is it just period value, or period x sample after. If so, what
    >>>> is the sample after value?
    >>>
    >>>
    >>> You lost me. You modified perf-script to print the period?
    >>>
    >>> Are you asking for the PMU counter value for 0x3c?
    >
    > yes

    perf-record does not get counter values when samples are genereated.

    >
    >>>
    >>> What perf commands are you running?
    >
    > perf script
    > (with no options)

    record command?

    I don't see what the 86754 and 1902764 values are in your example output
    above.


    David


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