From: "Frank Ch. Eigler" <fche@redhat.com>
To: linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108]
Date: Fri, 15 Sep 2006 14:34:32 -0400 [thread overview]
Message-ID: <20060915183432.GJ4577@redhat.com> (raw)
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@lxorguk.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
next reply other threads:[~2006-09-15 18:34 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-15 18:34 Frank Ch. Eigler [this message]
2006-09-15 20:25 ` [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108] Alan Cox
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