Date: Tue, 21 Nov 2000 17:51:00 -0800 From: Alfred Perlstein <bright@wintelcom.net> To: John Baldwin <jhb@FreeBSD.ORG> Cc: Daniel Eischen <eischen@vigrid.com>, Jonathan Lemon <jlemon@flugsvamp.com>, arch@FreeBSD.ORG Subject: Re: Thread-specific data and KSEs Message-ID: <20001121175100.B18037@fw.wintelcom.net> In-Reply-To: <XFMail.001121171923.jhb@FreeBSD.org>; from jhb@FreeBSD.ORG on Tue, Nov 21, 2000 at 05:19:23PM -0800 References: <Pine.SUN.3.91.1001121201152.11654A-100000@pcnet1.pcnet.com> <XFMail.001121171923.jhb@FreeBSD.org>
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* John Baldwin <jhb@FreeBSD.ORG> [001121 17:19] wrote: > > On 22-Nov-00 Daniel Eischen wrote: > >> %gs ? as I mentioned in my other message, this one might be useful for > >> addressing a structure of thread-local variables much like %fs is used for > >> per-CPU data. It also has value in that supposedly x86-64 (aka k64) has > >> both > >> %fs and %gs, but no other seg regs. > > > > All I need is one. > > Well, %gs would cover x86 and k64. I think ia64 has several application > registers that are available for OS use and we could steal one of those. I'm > not sure about the alpha though. Don't more segment registers cause more overhead for context switches? Just wondering. -- -Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org] "I have the heart of a child; I keep it in a jar on my desk." To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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