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

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Date:	Sat, 19 Feb 2011 10:32:16 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	David Ahern <daahern@...co.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	acme@...stprotocols.net, paulus@...ba.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH 3/3] perf events: add timehist option to record and report


* David Ahern <daahern@...co.com> wrote:

> On 01/23/11 at 03:45:67 a syslog event noted an application restart.
> Checking the applications logs it went silent. Why? What does perf say?
> 
> Oh, 2 days have gone by before said event is reported to engineering,
> and the server was been rebooted to 'clear' the problem - hence
> resetting monotonic clock.

I think that's a valid usecase and the feature you are suggestion is very useful.

Why not extend the regular trace output to also (optionally) output GTOD timestamps?

Thanks,

	Ingo
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