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Re: thread-ready ABIs

From: Jakub Jelinek <jakub at redhat dot com>
To: Ulrich Drepper <drepper at redhat dot com>
Cc: Andi Kleen <ak at suse dot de>, libc-hacker at sources dot redhat dot com, aj at suse dot de
Date: Fri, 18 Jan 2002 17:20:31 +0100
Subject: Re: thread-ready ABIs
References: <m3elkoa5dw.fsf@myware.mynet.suse.lists.libc-hacker> <p738zawhsab.fsf@oldwotan.suse.de> <m3n0zb63t8.fsf@myware.mynet>
Reply-to: Jakub Jelinek <jakub at redhat dot com>

On Fri, Jan 18, 2002 at 08:07:15AM -0800, Ulrich Drepper wrote:
> Andi Kleen <ak@suse.de> writes:
> 
> > On x86-64 we have the situation that context switches get somewhat more 
> > expensive as soon as thread registers are used. It would be nice if 
> > use of thread registers in non threaded programs could be avoided.
> 
> Not possible.

But what can be certainly done is not use %gs as thread register on x86-64,
but instead %r13 or whatever you choose in the ABI.

	Jakub

References:
- Re: thread-ready ABIs
  - From: Ulrich Drepper

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