Re: [Xen-devel] xl cpu online/offline?

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On January 14, 2016 5:55:42 AM EST, Ian Campbell <ian.campbell@xxxxxxxxxx> 
wrote:
>On Wed, 2016-01-13 at 09:53 -0500, Konrad Rzeszutek Wilk wrote:
>> Hey,
>> 
>> We have some libxc calls for onlining/offlining the CPU and they
>> are quite good for testing how well Xen behaves without say
>> doing an S3 suspend or such.
>> 
>> It occurred to me that it would be nice to have them hook up in
>> libxl/xl but I am not exactly sure what the right command line would
>be?
>> 
>> And whether you want to make it super-duper smart to be able to deal
>> with ranges or hex masks, etc (like xentrace does).
>> 
>> Anyhow my first thought was:
>> 
>> Âxl cpu online/offline
>> 
>> but most of the commands seem to follow one command per action, so
>> perhaps:
>> 
>> Âxl cpu-online
>> Âxl cpu-offline
>
>For end users is the functionality provided by xl vcpu-set not easier
>and
>more appropriate?
>
>AIUI the commands you are proposing differ in that they allow arbitrary
>sets of processors, rather than just the first N, to be manipulated?
>Perhaps adding a flag to xl vcpu-set would be a nice way to add this
>ability?
>

These hypercalls are for offllining and onling physical CPUs, not guest CPUs. 
As in the hypervisor one.

>Ian.



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