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

[Andrew Jones]

On Fri, Sep 03, 2021 at 03:38:13PM +0800, wangyanan (Y) wrote:
> 
> On 2021/9/3 15:25, Peter Maydell wrote:
> > 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.
> Got it.

Also, you'll likely want to rebase on Igor's acpi refactor series[*]

[*] https://www.mail-archive.com/qemu-devel@nongnu.org/msg822151.html

Thanks,
drew

> 
> Thanks,
> Yanan
> > thanks
> > -- PMM
> > 
> > .
>