linux-kernel - RE: Tracing Requirements (was: [RFC/Requirements/Design] h/w error reporting)

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Message-ID: <987664A83D2D224EAE907B061CE93D5301649A71DC@orsmsx505.amr.corp.intel.com>
Date:	Wed, 10 Nov 2010 12:54:21 -0800
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Frederic Weisbecker <fweisbec@...il.com>
CC:	Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Huang, Ying" <ying.huang@...el.com>,
	"bp@...en8.de" <bp@...en8.de>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"mchehab@...hat.com" <mchehab@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Arjan van de Ven <arjan@...radead.org>
Subject: RE: Tracing Requirements (was: [RFC/Requirements/Design] h/w error
	reporting)

>- Perf does not support flight recorder tracing (concurrent read/write)
>  - Sub-buffers are needed to support concurrent read/writes

When I hear somebody say "flight recorder" - I think of "black boxes"
in airplanes that log data while the flight is running, and are only
looked at offline later.  So I'm confused by the "concurrent read/write"
requirement.

Perhaps you could explain the use cases of your "flight recorder",
because it seems that the name doesn't fit exactly, and this is
causing me (and maybe others) some confusion.

Thanks

-Tony
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