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Re: [Xen-devel] [Patch] use full-size cpumask for vcpu-pin

To: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [Patch] use full-size cpumask for vcpu-pin
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Fri, 13 Aug 2010 14:25:30 +0100
Cc: Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
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On 13/08/2010 14:21, "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx> wrote:

>> Since Xen discards any CPUs which are not online at the time of the
>> setvcpuaffinity hypercall, expressing "all CPUs present and future" is a bit
>> pointless.
> Hm, no, I'm talking rubbish. Argh. Okay, his patch is fine then. :-D
> You can check it in to xen-unstable-tools.hg.

One suggestion: that we rename the syctl.physinfo field 'max_phys_cpus' to
'max_possible_cpus'. The 'phys' is kind of redundant since this is the
physinfo sysctl, and 'possible' provides a better hint that this fields
indicates maximum possible supported CPUs now and forever on this boot of
the system.

 -- Keir

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