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xen-devel
Re: [Xen-devel] Re: lazy context switching
On Tuesday 30 August 2005 10:25, Dan Magenheimer wrote:
> Sorry for the late reply... keeping up with xen-devel
> is getting tough!
Yes, I just occasionally skim...
> How does Linux do this on Power? Xen/ia64 heavily
> leverages the equivalent Linux/ia64 code. As you
> may know, Linux/ia64 scatters state all over
> memory and uses "unwind descriptors" so that it
> can recover all the state. I'd imagine Power does
> something similar...
Linux has a per-kernel thread stack, so '_switch' saves the current (i.e.
kernel, not original usermode) nonvolatiles to the previous task structure.
For Xen/PPC, we use a per-cpu stack, so we need to save the original (domain)
nonvolatiles to the previous domain structure.
--
Hollis Blanchard
IBM Linux Technology Center
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