On 12/20/24 13:23, Yicong Yang wrote:
From: Yicong Yang <yangyic...@hisilicon.com> The core CPU control framework supports runtime SMT control which is not yet supported on arm64. Besides the general vulnerabilities concerns we want this runtime control on our arm64 server for: - better single CPU performance in some cases - saving overall power consumption
EAS is disabled when SMT is present. I am curious to know how power saving happens here.
This patchset implements it in the following aspects: - Provides a default topology_is_primary_thread() - support retrieve SMT thread number on OF based system - support retrieve SMT thread number on ACPI based system - select HOTPLUG_SMT for arm64 Tests has been done on our ACPI based arm64 server and on ACPI/OF\ based QEMU VMs.
