Re: [PATCH v6 0/5] hw/arm/virt: Introduce cpu topology support

[Peter Maydell]

On Fri, 3 Sept 2021 at 08:05, wangyanan (Y) <wangyanan55@huawei.com> wrote:
>
>
> On 2021/9/2 23:56, Peter Maydell wrote:
> > On Tue, 24 Aug 2021 at 13:20, Yanan Wang <wangyanan55@huawei.com> wrote:
> >> This new version is based on patch series [1] which introduces some
> >> fix and improvement for smp parsing.
> >>
> >> Description:
> >> Once the view of an accurate virtual cpu topology is provided to guest,
> >> with a well-designed vCPU pinning to the pCPU we may get a huge benefit,
> >> e.g., the scheduling performance improvement. See Dario Faggioli's
> >> research and the related performance tests in [2] for reference.
> >>
> >> This patch series introduces cpu topology support for ARM platform.
> >> Both cpu-map in DT and ACPI PPTT table are introduced to store the
> >> topology information. And we only describe the topology information
> >> to 6.2 and newer virt machines, considering compatibility.
> >>
> >> patches not yet reviewed: #1 and #3.
> >>
> >> [1] 
> >> https://lore.kernel.org/qemu-devel/20210823122804.7692-1-wangyanan55@huawei.com/
> >> [2] 
> >> https://kvmforum2020.sched.com/event/eE1y/virtual-topology-for-virtual-machines
> >> -friend-or-foe-dario-faggioli-suse
> >
> > Hi; this series doesn't apply to current head-of-git. Is it
> > intended to be based on some other series ?
> >
> Yes, it was based on the -smp parsing changes in [1] which hasn't been
> picked yet. Given that [1] somehow affects the topology parsing results
> which we will describe to guest, I think it may be better that [1] can be
> merged first and then this series follows.

OK. I'll ignore this for now; please resend once that other series
has been accepted.

thanks
-- PMM