[Xen-devel] RE: [PATCH] Allocate vmcs pages when system booting

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx> 15.01.10 10:06 >>>
>b) Can we still turn to the original patch, i.e. pre-allocate all VMCS pages 
>for all possible CPU?

I'm generally opposed to pre-allocations, at least as long as all CPUs are
considered 'possible'. Building with a relatively high nr_cpus= setting
and then running on a relatively small system results in (close to)
unacceptable overhead.

In fact it's really not clear to me why cpu_possible_map must be set to
CPU_MASK_ALL - if Linux has ways to avoid this, Xen should have too.

Jan


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