Messages in this thread | | | Date | Tue, 20 Dec 2011 13:46:31 -0800 | From | Frank Rowand <> | Subject | Re: [lttng-dev] [PATCH 09/11] sched: export task_prio to GPL modules |
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On 12/20/11 03:08, Ingo Molnar wrote: > > (Cc:-ing Arnaldo on this as well.) > > * Mathieu Desnoyers <compudj@krystal.dyndns.org> wrote: >
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> 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 perf.data 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).
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-Frank
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