Re: [Xen-devel] [PATCH v2 3/6] xen/pvshim: identity pin shim vCPUs to pCPUs

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Thu, Jan 18, 2018 at 04:22:11AM -0700, Jan Beulich wrote:
> >>> On 18.01.18 at 12:11, <ian.jackson@xxxxxxxxxxxxx> wrote:
> > Jan Beulich writes ("Re: [PATCH v2 3/6] xen/pvshim: identity pin shim vCPUs 
> > to pCPUs"):
> >> On 17.01.18 at 17:29, <roger.pau@xxxxxxxxxx> wrote:
> >> > Since VCPUOP_{up/down} already identity maps vCPU hotplug to pCPU
> >> > hotplug also identity pin the vCPUs to the pCPUs in the scheduler.
> >> > This prevents 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>
> >> > Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>
> >> 
> >> Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
> > 
> > Should this be in the security response comet branch ?
> 
> I believe so, but better ask Roger and Wei.

It should be in the 4.10 comment branch only (not the 4.8), since it's
a shim patch.

In any case, it's not a bug fix, just a performance improvement but
still nice to have IMHO.

Roger.

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