Re: linux kernel and floating point register

[Federico Gherardini <f.gherardini@xxxxxxxxxxxxxxx>]

Bao zhao wrote:

> from
> http://www.uniforum.chi.il.us/slides/linuxkernel/LinuxKernel.ppt
>
> Daniel P. Bovet said
>
> "two cases of deferred allocation of resources in Linux
> (1) page frames (demand paging, Copy On Write)
> (2)floating point registers"
>
> I cannot understand the second case.
>
> Thanks for anyone's help.
Hi,
It's because, during context switch, the floating point registers are 
not saved if the process hasn't used any floating point instruction, 
and, if previously saved, they are not restored until the process uses a 
floating point instruction.

Cheers,
Fede


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