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

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Date:	Tue, 19 Sep 2006 15:17:18 +0200 (CEST)
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	Christoph Hellwig <hch@...radead.org>
cc:	Ingo Molnar <mingo@...e.hu>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	"Frank Ch. Eigler" <fche@...hat.com>, karim@...rsys.com,
	Tim Bird <tim.bird@...sony.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	linux-kernel@...r.kernel.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>
Subject: Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108

Hi,

On Tue, 19 Sep 2006, Christoph Hellwig wrote:

> > Who is going to implement this for every arch?
> > Is this now the official party line that only archs, which implement all 
> > of this, can make use of efficient tracing?
> 
> Come on, stop trying to be an asshole.  It's always been the case that to
> use new functionality you have to add arch code where nessecary.

On the contrary I'm really trying my best to be reasonable.
If there were no way around implementing kprobes, I would completely agree 
with you.

Let's take an item from todo list: TLS support for m68k. This a language 
feature becoming more and more important and increasingly difficult to 
work around it. Considering the complexities of this feature it will take 
quite a bit of the time available to me and somehow I doubt someone will 
beat me to it. I'm not complaining about it, I even enjoy hacking on it, 
but I also have to take no shit on how I have to spend my time.

Considering this I hope you understand how important kprobes are to me, I 
admit it's a nice a feature, but it's far from being essential.

bye, Roman
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