From owner-freebsd-arch  Fri Feb  1 10: 0:26 2002
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Date: Fri, 1 Feb 2002 10:00:00 -0800 (PST)
From: Julian Elischer <julian@elischer.org>
To: Terry Lambert <tlambert2@mindspring.com>
Cc: Daniel Eischen <eischen@pcnet1.pcnet.com>, arch@FreeBSD.ORG
Subject: Re: FWIW... maybe this way already?
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this is what mach threads did..
nowm the question is: how do you know where the beginning of the stack is?


On Fri, 1 Feb 2002, Terry Lambert wrote:

> Linux did what I think is an incredibly clever thing.
> 
> They put the current CPU at the beginning of the stack,
> and then change it when/if they migrate the process.
> 
> Since KSEs have stacks, as well, you could put the
> process and thread ID after the CPU ID, there.
> 
> Saves weirding out a register to get the CPU, PID, TID,
> since the stack base is always known.
> 
> FWIW.
> 
> -- Terry
> 


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