Re: [Xen-devel] [PATCH] tools: convert cpumap bitmap to list

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 19 Oct 2005, at 23:45, Ryan Harper wrote:

> This patch modifies the lowlevel xc vcpuinfo call to convert a vcpu's
> cpumap to a list of int.  XendDomainInfo.py filters the cpumap into a
> smaller list that is bound by the number of vcpus allocated to a 
> domain.
Two things:

First, there is no correspondence between size of cpumap and 
max_vcpu_id, because there is no direct relationship between sizes of 
virtual and physical CPU spaces. We could have a system with more vcpus 
than physical cpus, or vice versa. And cpumap represents sets of 
physical cpus, not sets of virtual cpus.
Second, I meant that the cpumap list should contain just the list of 
physical cpus that that vcpu can run on. So, for example, a cpumap 
bitmask of 0x5 would correspond to the cpumap list [0, 2], not the list 
[0, -1, 2, -1, -1, ...]. The latter is a weird and redundant 
representation.
 -- Keir


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