linux-kernel - Re: LTTng and SystemTAP (Everyone who is scared to read this huge thread, skip to here)

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Message-ID: <20060918151059.GA10106@elte.hu>
Date:	Mon, 18 Sep 2006 17:11:00 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Theodore Tso <tytso@....edu>, Nicholas Miell <nmiell@...cast.net>,
	Paul Mundt <lethal@...ux-sh.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>, Jes Sorensen <jes@....com>,
	Andrew Morton <akpm@...l.org>,
	Tom Zanussi <zanussi@...ibm.com>,
	Richard J Moore <richardj_moore@...ibm.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Michel Dagenais <michel.dagenais@...ymtl.ca>,
	Christoph Hellwig <hch@...radead.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	William Cohen <wcohen@...hat.com>,
	"Martin J. Bligh" <mbligh@...igh.org>
Subject: Re: LTTng and SystemTAP (Everyone who is scared to read this huge thread, skip to here)


* Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> wrote:

> > Some of the extensive hooking you do in LTT could be aleviated to a 
> > great degree if you used dynamic probes. For example the syscall 
> > entry hackery in LTT looks truly scary.
> 
> Yes, agreed. The last time I checked, I thought about moving this 
> tracing code to the syscall_trace_entry/exit (used for security hooks 
> and ptrace if I remember well). I just didn't have the time to do it 
> yet.

correct, that's where all such things (auditing, seccomp, ptrace, 
sigstop, freezing, etc.) hook into. Much (all?) of the current entry.S 
hacks can go away in favor of a much easier .c patch to 
do_syscall_trace() and this would reduce a significantion portion of the 
present intrusiveness of LTTng.

	Ingo
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