linux-kernel - Re: [RFC PATCH] LTTng relay buffer allocation, read, write

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Date:	Tue, 30 Sep 2008 14:22:45 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
cc:	Martin Bligh <mbligh@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, prasad@...ux.vnet.ibm.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>, od@...e.com,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>, hch@....de,
	David Wilder <dwilder@...ibm.com>,
	Tom Zanussi <zanussi@...cast.net>
Subject: Re: [RFC PATCH] LTTng relay buffer allocation, read, write


On Tue, 30 Sep 2008, Mathieu Desnoyers wrote:
> 
> In Steven's scheme, the event IDs in the 4 bytes are reserved for
> (useless) internal use ;) They can therefore not be used for specific
> tracer event IDs, which I think is a misuse of the precious bits
> otherwise available to store really useful event IDs.

I'm using them, so they must not be totally useless. ;-)

But ftrace has its own event ids and I don't want the ring buffer to ever 
have to know about them.

-- Steve

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