Re: [Xen-devel] [PATCH v2 09/48] xen/sched: move some per-vcpu items to struct sched_unit

[Jan Beulich <jbeulich@xxxxxxxx>]

On 09.09.2019 08:39, Juergen Gross wrote:
> On 04.09.19 16:16, Jan Beulich wrote:
>> On 09.08.2019 16:57, Juergen Gross wrote:
>>> V2:
>>> - move affinity_broken back to struct vcpu (Jan Beulich)
>>
>> But this alone won't work: Now a 2nd vCPU in a unit will clobber
>> what a 1st one may have set as an affinity override. I don't
>> think you can get away without a per-vCPU CPU mask, or a
>> combination of per-vCPU and per-unit state flags.
> 
> See patch 24: this one adds a helper sched_check_affinity_broken() for
> that purpose iterating over the vcpus checking the affinity_broken flags
> and returning true if any of the vcpus has its flag set.

Okay, patch 24 is still before multiple vCPU-s per unit become
possible, so no intermediate breakage. But could you please
make this explicit by slightly extending the description of the
change here?

Jan

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