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    SubjectRe: [PATCH 3/3] perf events: add timehist option to record and report
    Em Fri, Feb 18, 2011 at 11:53:16AM -0700, David Ahern escreveu:
    > On 02/18/11 11:41, Arnaldo Carvalho de Melo wrote:
    > > Think about tcpdump + networking tracepoints or 'perf probe' dynamic
    > > events in the network stack, he wants to merge those logs and correlate
    > > the tcpdump packet exchange with the tracepoints events in the network
    > > stack, etc.

    > I'm zoned in on ap logs, but tcpdump and network analysis is another
    > very good example. packets are tagged with realtime:

    > static inline void __net_timestamp(struct sk_buff *skb)
    > {
    > skb->tstamp = ktime_get_real();
    > }

    I'd bet the original intent was to merge that with app specific logs :-)

    Anyway, I think the way out of this is to have a clock_gettime like
    interface, let the users decide what they need (or think they do),
    sample it together with the other events and be done with it.

    - Arnaldo


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