Re: Linux 2.4.30-rc2

[Arjan van de Ven]

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. 

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