>
>
>I've updated this patch and switched to using a scale/shift
>like Xen is
>doing, but I must admit, I don't understand how it helps adjtime. I
>poked around a bit and it wasn't obvious.
I think the reason is that Xen can't use FP to avoid FP save/restore
at VM Exit time, while PV guest can use FP if want.
No matter scale/shift or FP, hypervisor need to guarantee the time
is accurate enough for years and no overflow. A server may
run for couple years:-)
>
>Why is having {mult=1<<22, shift=22} better for adjtime than {mult=1,
>shift=0}?
>
To avoid overflow after long run. (at least Xen/IA64 is for that
purpose).
thx,eddie
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