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

Frank Ch. Eigler
2006-09-15T18:25:04Z

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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.

- FChE

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