Re: [Xen-devel] [PATCH] x86: make the dom0_max_vcpus option more flexible

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 04.05.12 at 18:26, David Vrabel <david.vrabel@xxxxxxxxxx> wrote:
> On 04/05/12 17:12, Jan Beulich wrote:
>>>>> On 04.05.12 at 18:01, David Vrabel <david.vrabel@xxxxxxxxxx> wrote:
>>> From: David Vrabel <david.vrabel@xxxxxxxxxx>
>>>
>>> The dom0_max_vcpus command line option only allows the exact number of
>>> VCPUs for dom0 to be set.  It is not possible to say "up to N VCPUs
>>> but no more than the number physically present."
>>>
>>> Add min: and max: prefixes to the option to set a minimum number of
>>> VCPUs, and a maximum which does not exceed the number of PCPUs.
>>>
>>> For example, with "dom0_max_vcpus=min:4,max:8":
>> 
>> Both "...max...=min:..." and "...max...=max:" look pretty odd to me;
>> how about simply allowing a range along with a simple number (since
>> negative values make no sense, omitting either side of the range would
>> be supportable if necessary.
> 
> I was copying the way dom0_mem worked but yeah, it's not very pretty.
> 
> Is dom0_max_vcpus=<min>-<max> (e.g., dom0_max_vcpus=4-8)  what you were
> thinking of?

Yes.

> Using a single value would have to set both <min> and <max> or the
> behaviour of the option changes (i.e., =N is the same as =N-N).

That sounds plausible.

Jan


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