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    SubjectRe: [PATCH] perf: add support for per-event sampling period or frequency in perf record
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    On Tue, 2010-11-23 at 11:45 +0200, Stephane Eranian wrote:
    > This patch allows specifying a per event sampling period or frequency.
    > Up until now, the same sampling period or frequency was applied to all
    > the events specified on the command line of perf record. A sampling
    > period depends on the event, thus it is necessary to specify it per event.
    >
    > With this patch, both the -F and -c options now take a comma separated
    > list of values. If a value is omitted for an event, it defaults to 1000Hz
    > frequency mode as before.
    >
    > $ perf record -e cycles,instructions -c 100000,200000 -a -- sleep 5


    I remember an email not too long ago where people proposed to change the
    syntax so that:

    -e evnt1,evnt2 -- create a group containing both events
    -e evnt1 -e evnt2 -- create two separate events

    It would be nice to make sure these two proposals will not interfere.

    Alternatively we extend the event syntax to include the period,
    something like:

    -e evnt1:period=1234




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