linux-kernel - Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108

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Message-ID: <20060919120825.GC4965@infradead.org>
Date:	Tue, 19 Sep 2006 13:08:25 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	Martin Bligh <mbligh@...igh.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Roman Zippel <zippel@...ux-m68k.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...l.org>, Ingo Molnar <mingo@...hat.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tom Zanussi <zanussi@...ibm.com>, ltt-dev@...fik.org,
	Michel Dagenais <michel.dagenais@...ymtl.ca>, fche@...hat.com
Subject: Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108

On Thu, Sep 14, 2006 at 01:55:44PM -0700, Martin Bligh wrote:
> 1. They're harder to maintain out of tree.
> 2. they're written in some jibberish awk crap
> 3. They're slower. If you're doing thousands of tracepoints a second,
> 	into a circular 8GB log buffer, that *does* matter. You want
> 	to peturb what you're measuring as little as possible.

agreed to all these and I'd like to add:

 4.  If you merge proper dynamic tracing infrastructure you get static
     traces for free.  It's just a bunch of macros directly calling
     the trace function also used by the dynamic tracing code, maybe
     keyed of an enable variable.

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