On Sat, Mar 26, 2005 at 12:46:19PM +0100, Arjan van de Ven wrote:
> On Sat, 2005-03-26 at 12:34 +0100, Willy Tarreau wrote:
> > Marcelo,
> >
> > just another one and that's all. Zachary Amsden found an unconditional
> > write to a debug register in the signal delivery path which is only
> > needed when we use a breakpoint. This is a very expensive operation on
> > x86, and doing it conditionnaly enhanced signal delivery speed by 33%
> > for him.
>
> this sounds rather risky for this late in the game; heck it sounds risky
> in 2.4 period. This code changed a lot in 2.6 so just a plain backport
> is by no means risk free, while the effect of a wrong debug register can
> even have security impact.
ok, that's a good reason.
Willy
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