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

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Message-ID: <450AEE87.4080101@mbligh.org>
Date:	Fri, 15 Sep 2006 11:18:47 -0700
From:	Martin Bligh <mbligh@...igh.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	karim@...rsys.com, Roman Zippel <zippel@...ux-m68k.org>,
	Tim Bird <tim.bird@...sony.com>, Ingo Molnar <mingo@...e.hu>,
	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>
Subject: Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108

>>Also, care to explain how kprobes can be used to access same data
>>without having to actually customize a probe point for every binary?
> 
> 
> Thats why we have things like systemtap.
> 
> All we appear to lack is systemtap ability to parse debug data so it can
> be told "trace on line 9 of sched.c and record rq and next"

But that's the whole point - if it's not integrated into a marker as
source code, it requires manual intervention for every bloody release
to do. "line 9 of sched.c" is a farcically stupid way of doing tags
on a dynamically moving project like the linux kernel.

Yes, that may work OK for something that is very static, like a distro
snapshot, but as a general mechanism, it's unsustainable and broken.

M.
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