Messages in this thread | | | Date | Sat, 3 Mar 2007 08:19:33 +0100 | From | Ingo Molnar <> | Subject | Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3 |
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* Davide Libenzi <davidel@xmailserver.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.
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