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

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Message-ID: <33307c790809301023v1b0755fbsab1bbfa9bfaad58@mail.gmail.com>
Date:	Tue, 30 Sep 2008 10:23:21 -0700
From:	"Martin Bligh" <mbligh@...gle.com>
To:	"Steven Rostedt" <rostedt@...dmis.org>
Cc:	"Mathieu Desnoyers" <mathieu.desnoyers@...ymtl.ca>,
	"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, Sep 30, 2008 at 10:22 AM, Martin Bligh <mbligh@...gle.com> wrote:
>> A 4 byte dataless payload is useless anyway.
>
> Not at all convinced that's true - we used it for lots of things.
> Start and end of irq event is one frequent example.
>
> Also, in a compact mode, we can record start and end of
> syscalls like this (without parameters).

Ah, sorry, maybe I misread this. No data with no event ids, etc
is fairly useless. 4 bytes data including space to record event ids is OK.
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