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    SubjectRe: [PATCH] perf-record: Create events initially disabled -- again

    On Mon, 14 May 2012 22:46:33 -0300, Arnaldo Carvalho de Melo wrote:
    > Em Mon, May 14, 2012 at 07:42:30PM -0600, David Ahern escreveu:
    >> On 5/14/12 7:07 PM, Namhyung Kim wrote:
    >> >>Something else is wrong then. I tested that command (saw your patch in
    >> >>the history) and it worked for me. Also, this code path does not
    >> >>affect perf-stat -- it touches perf-record and perf-test only.
    >> >Ah, right. But still wouldn't it be better changing the conditional
    >> >rather than disabling it unconditionally?
    >> I think it would be best to disable all events initially and then
    >> enable them when ready. It works for perf-record and perf-test just
    >> fine and limits the samples to what you care about.
    > And we need to have all this logic in a central place, the "open" method
    > of perf_evlist :-)

    Agreed. So we need to make it generic to suitable for perf-stat and
    perf-top (and others?) also.

    > The perf_target abstraction is the way to get there, but in the process
    > I think we really need to have each new method with a 'perf test' entry
    > and in addition to that an 'autotest'* entry to test the perf builtins.
    > - Arnaldo
    > *

    I'll have a look at it.


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