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

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Message-ID: <20060915182428.GI4577@redhat.com>
Date:	Fri, 15 Sep 2006 14:24:28 -0400
From:	"Frank Ch. Eigler" <fche@...hat.com>
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

Hi -

On Fri, Sep 15, 2006 at 07:31:48PM +0100, Alan Cox wrote:

> Ar Gwe, 2006-09-15 am 13:08 -0400, ysgrifennodd Frank Ch. Eigler:
Yeah, or something. :-)

> > Alan Cox <alan@...rguk.ukuu.org.uk> writes:
> > - where 1000-cycle int3-dispatching overheads too high
> 
> Why are your despatching overheads 1000 cycles ? (and if its due to int3
> why are you using int 3 8))

Smart teams from IBM and Hitachi have been hammering away at this code
for a year or two now, and yet (roughly) here we are.  There have been
experiments involving plopping branches instead of int3's at probe
locations, but this is self-modifying code involving multiple
instructions, and appears to be tricky on SMP/preempt boxes.

- FChE

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