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Date: Wed, 5 Mar 2003 21:08:56 -0500
From: Benjamin LaHaise <bcrl@redhat.com>
To: Ulrich Drepper <drepper@redhat.com>
Cc: Andi Kleen <ak@suse.de>, Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: Better CLONE_SETTLS support for Hammer
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References: <3E664836.7040405@redhat.com> <20030305190622.GA5400@wotan.suse.de> <3E6650D4.8060809@redhat.com> <20030305212107.GB7961@wotan.suse.de> <3E668267.5040203@redhat.com>
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On Wed, Mar 05, 2003 at 03:04:07PM -0800, Ulrich Drepper wrote:
> I wouldn't want to either in your position.  You caused this whole mess
> and now you're not willing to fix it.

I disagree.  We don't need to use a segment register to get the thread 
library equivalent of "current".  Changing the segment registers on a 
per process basis is a waste of time in the context switch.  Instead, 
making x86-64 TLS support based off of the stack pointer, or even using 
a fixed per-cpu segment register such that gs:0 holds the pointer to the 
thread "current" would be better.  Make the users of threads suffer, not 
every single application and syscall in the system.

		-ben
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