linux-kernel - Re: [PATCH 3/3] perf events: add timehist option to record and report

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Message-ID: <20110218190606.GD302@ghostprotocols.net>
Date:	Fri, 18 Feb 2011 17:06:06 -0200
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	David Ahern <daahern@...co.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>, linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org, peterz@...radead.org,
	paulus@...ba.org, Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: 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:
> > 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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