-----邮件原件----- 发件人: Andrew Jones [mailto:drjo...@redhat.com] 发送时间: 2021年3月10日 17:21 收件人: fangying <fangyi...@huawei.com> 主题: Re: [RFC PATCH 0/5] hw/arm/virt: Introduce cpu topology support
> Hi Ying Fang, > > Do you plan to repost this soon? It'd be great if it got into 6.0. > > Thanks, > drew Hi Andrew Thanks for your remind. Yes, I will repost and update this series soon. It seems 6.0 will be soft feature frozen at 3.16. Deadline is close. On Thu, Feb 25, 2021 at 04:56:22PM +0800, Ying Fang wrote: > An accurate cpu topology may help improve the cpu scheduler's decision > making when dealing with multi-core system. So cpu topology > description is helpful to provide guest with the right view. Dario > Faggioli's talk in [0] also shows the virtual topology may has impact on > sched performace. > Thus this patch series is posted to introduce cpu topology support for > arm platform. > > Both fdt and ACPI are introduced to present the cpu topology. To > describe the cpu topology via ACPI, a PPTT table is introduced > according to the processor hierarchy node structure. This series is > derived from [1], in [1] we are trying to bring both cpu and cache > topology support for arm platform, but there is still some issues to > solve to support the cache hierarchy. So we split the cpu topology part out > and send it seperately. > The patch series to support cache hierarchy will be send later since > Salil Mehta's cpu hotplug feature need the cpu topology enabled first > and he is waiting for it to be upstreamed. > > This patch series was initially based on the patches posted by Andrew Jones > [2]. > I jumped in on it since some OS vendor cooperative partner are eager for it. > Thanks for Andrew's contribution. > > After applying this patch series, launch a guest with virt-6.0 and cpu > topology configured with sockets:cores:threads = 2:4:2, you will get > the bellow messages with the lscpu command. > > ----------------------------------------- > Architecture: aarch64 > CPU op-mode(s): 64-bit > Byte Order: Little Endian > CPU(s): 16 > On-line CPU(s) list: 0-15 > Thread(s) per core: 2 > Core(s) per socket: 4 > Socket(s): 2 > NUMA node(s): 2 > Vendor ID: HiSilicon > Model: 0 > Model name: Kunpeng-920 > Stepping: 0x1 > BogoMIPS: 200.00 > NUMA node0 CPU(s): 0-7 > NUMA node1 CPU(s): 8-15 > > [0] > https://kvmforum2020.sched.com/event/eE1y/virtual-topology-for-virtual > -machines-friend-or-foe-dario-faggioli-suse > [1] > https://lists.gnu.org/archive/html/qemu-devel/2020-11/msg02166.html > [2] > https://patchwork.ozlabs.org/project/qemu-devel/cover/20180704124923.3 > 2483-1-drjo...@redhat.com > > Ying Fang (5): > device_tree: Add qemu_fdt_add_path > hw/arm/virt: Add cpu-map to device tree > hw/arm/virt-acpi-build: distinguish possible and present cpus > hw/acpi/aml-build: add processor hierarchy node structure > hw/arm/virt-acpi-build: add PPTT table > > hw/acpi/aml-build.c | 40 ++++++++++++++++++++++ > hw/arm/virt-acpi-build.c | 64 +++++++++++++++++++++++++++++++++--- > hw/arm/virt.c | 40 +++++++++++++++++++++- > include/hw/acpi/acpi-defs.h | 13 ++++++++ > include/hw/acpi/aml-build.h | 7 ++++ > include/hw/arm/virt.h | 1 + > include/sysemu/device_tree.h | 1 + > softmmu/device_tree.c | 45 +++++++++++++++++++++++-- > 8 files changed, 204 insertions(+), 7 deletions(-) > > -- > 2.23.0 >
