Messages in this thread | | | Date | Sat, 26 Mar 2005 13:29:03 +0100 | From | Willy Tarreau <> | Subject | Re: Linux 2.4.30-rc2 |
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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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