Re: [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:

quoted

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