Messages in this thread | | | Date | Fri, 15 Sep 2006 14:24:28 -0400 | From | "Frank Ch. Eigler" <> | Subject | Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108 |
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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.
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