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Date: Sat, 3 Mar 2007 08:19:33 +0100
From: Ingo Molnar <mingo@...e.hu>
To: Davide Libenzi <davidel@...ilserver.org>
Cc: Nicholas Miell <nmiell@...cast.net>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Arjan van de Ven <arjan@...radead.org>,
Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3
* Davide Libenzi <davidel@...ilserver.org> 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.
Ingo
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