Re: [Xen-devel] [PATCH 3/6] xen/pvshim: identity pin shim vCPUs to pCPUs

[George Dunlap <dunlapg@xxxxxxxxx>]

On Wed, Jan 17, 2018 at 9:48 AM, Roger Pau Monne <roger.pau@xxxxxxxxxx> wrote:
> Since VCPUOP_{up/down} already identity pins vCPU hotplug to pCPU
> hotplug also pin the vCPUs to the pCPUs in the scheduler. This prevent
> vCPU migration and should improve performance.
>
> While there also use __cpumask_set_cpu instead of cpumask_set_cpu,
> there's no need to use the locked variant.
>
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>

Sorry, I just realized this -- we already have a way to pin a VM 1:1
-- d->is_pinned should do what you want here without having to
special-case the pvshim.

It seems like something like the attached might be better (compile-tested only).

 -George

Attachment: 0001-x86-shim-Use-d-is_pinned-to-pin-the-shim.patch
Description: Text Data

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