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Re: Fix for THREAD_GETMEM (et al) madness in useldt.h


From: Wolfram Gloger
Subject: Re: Fix for THREAD_GETMEM (et al) madness in useldt.h
Date: Fri, 24 Nov 2000 10:01:08 +0100 ("MET)

Hello,

> While I'm on the topic, why is useldt.h only enabled
>    (a) On i686 platforms (when every IA32 processor has both the GS register
>        and LDT support)
>    (b) On 2.4.x kernels  (it appears to work fine on 2.2.16 and 2.2.18pre20).

I asked a similar question recently, and Uli Drepper suspected that
the LDT switching would be very slow on processors before i686.
I have yet to confirm that -- maybe you can check pthread_self()
performance in both cases, too, so we have some numbers.

It sure would be nice to get useldt.h (in particular FLOATING_STACKS)
on i585 as well.

Regards,
Wolfram.



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