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    SubjectRe: [lttng-dev] [PATCH 09/11] sched: export task_prio to GPL modules

    * Frank Rowand <> wrote:

    > On 12/20/11 03:08, Ingo Molnar wrote:
    > >
    > > (Cc:-ing Arnaldo on this as well.)
    > >
    > > * Mathieu Desnoyers <> wrote:
    > >
    > < snip >
    > > I think your concentration on ABIs is missing a very fundamental
    > > property of instrumentation:
    > >
    > > the life-time and persistence of instrumentation data is
    > > typically very short ('days' is already an exception - typical
    > > is minutes, at most hours), and for that reason we havent been
    > > getting much pressure from users to maintain a ABI -
    > > but we are doing it nevertheless.
    > >
    > > Instrumentation is fundamentally about the 'here and now' and so
    > > it fundamentally differs from things like backup formats and
    > > database formats. An ABI does not hurt and we are maintaining
    > > it, but you are overrating its importance significantly.
    > Just to provide visibility to a different use case...
    > The life time of my data is typically weeks, months, or years
    > (though I am not likely to re-process year old raw data).

    I'm not saying that it's absolutely never done: for example
    monitoring/logging on a production box and evaluating events
    only once per month would certainly qualify.

    I just say that the overwhelming majority of usecases utilize
    traces on a short time-span and that we must keep the common
    usecase in mind when supporting not so common usecases.

    It's the same deal as with -rt: compared to the 'normal' usage
    of Linux -rt is somewhat of a special case - yet it's still
    something very much worth doing, as long as the main usecase is
    always kept in mind.



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