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Date:	Sat, 3 Mar 2007 08:19:33 +0100
From:	Ingo Molnar <>
To:	Davide Libenzi <>
Cc:	Nicholas Miell <>,
	Linux Kernel Mailing List <>,
	Arjan van de Ven <>,
	Linus Torvalds <>
Subject: Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3

* Davide Libenzi <> wrote:

> [...] Status word and control bits should not be changed from 
> underneath userspace AFAIK. [...]

Note that the control bits do not just magically change during normal 
FPU use. It's a bit like sys_setsid()/iopl/etc., it makes little sense 
to change those per-thread anyway. This is a non-issue anyway - what is 
important is that the big bulk of 512 (or more) bytes of FPU state /are/ 
callee-saved (both on 32-bit and on 64-bit), hence there's no need to 
unlazy anything or to do expensive FPU state saves or other FPU juggling 
around threadlet (or even syslet) use.

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