Messages in this thread | | | From | KOSAKI Motohiro <> | Subject | Re: [PATCH 0/3] Add walltime support for ring-buffer | Date | Mon, 3 Aug 2009 18:32:11 +0900 (JST) |
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> > * KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> wrote: > > > It can. but I don't think it is sufficient. On flight recorder > > use-case, The tracing run more than one year. And, Administrator > > only see last N sec log. (previous logs were overwritten by > > ring-buffer go-around) > > That's definitely something we want to enable ASAP. > > I'm wondering why a single u64 timestamp is not enough to express > the full, absolute range of time elapsed since bootup, in > nanoseconds. > > That would make walltime a matter of pretty-printing only - we'd > have to convert the u64 nsec timestamp into a walltime format, > right? > > In fact we could change all the timestamps to be standardized along > 'nanoseconds elapsed since 1970' or so - not nanoseconds since the > last bootup. That still fits just fine within 64 bits - u64 > nanoseconds has a scope of 500+ years.
Ah, you are right. thanks correct me. but I think ntp updating time storing is necessary too.
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