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xen-devel
Re: [Xen-devel] How to query the number of vcpus?
On 30 Apr 2005, at 19:03, Ian Pratt wrote:
cpumap_t is a reasonable name as at least it won't conflict
with type names internal to Xen.
However, why pass a pointer to a cpumap_t into PINCPU? And
should we cater now for systems with too many cpus to be
represented by a long?
I think so -- might as well get the interface right. I was thinking
something like the fd mask that get's passed to select, where you
sepcify the highest set bit.
In some cases Xen returns a cpumap to the guest (in getdomaininfo). In
that case the fd mask trick won't really work as the guest needs to
know in advance the biggetst map that Xen may return. Anyway, a map of
256 bits is going to give us a fair amount of headroom I think.
-- Keir
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