From: Shrikanth Hegde <sshegde@linux.ibm.com>
To: Yicong Yang <yangyicong@huawei.com>
Cc: linuxppc-dev@lists.ozlabs.org, x86@kernel.org,
linux-kernel@vger.kernel.org, morten.rasmussen@arm.com,
msuchanek@suse.de, gregkh@linuxfoundation.org, rafael@kernel.org,
jonathan.cameron@huawei.com, prime.zeng@hisilicon.com,
linuxarm@huawei.com, yangyicong@hisilicon.com, xuwei5@huawei.com,
guohanjun@huawei.com, catalin.marinas@arm.com, will@kernel.org,
sudeep.holla@arm.com, tglx@linutronix.de, peterz@infradead.org,
mpe@ellerman.id.au, linux-arm-kernel@lists.infradead.org,
mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com,
pierre.gondois@arm.com, dietmar.eggemann@arm.com
Subject: Re: [PATCH v10 0/4] Support SMT control on arm64
Date: Thu, 26 Dec 2024 14:53:32 +0530 [thread overview]
Message-ID: <d0e73e64-cdf7-443b-a8e3-7c1f25533000@linux.ibm.com> (raw)
In-Reply-To: <20241220075313.51502-1-yangyicong@huawei.com>
On 12/20/24 13:23, Yicong Yang wrote:
> From: Yicong Yang <yangyicong@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.
>
next prev parent reply other threads:[~2024-12-26 9:24 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-12-20 7:53 [PATCH v10 0/4] Support SMT control on arm64 Yicong Yang
2024-12-20 7:53 ` [PATCH v10 1/4] cpu/SMT: Provide a default topology_is_primary_thread() Yicong Yang
2024-12-20 7:59 ` Yicong Yang
2024-12-23 16:34 ` Jonathan Cameron
2024-12-24 12:15 ` Yicong Yang
2024-12-26 7:18 ` Shrikanth Hegde
2024-12-26 11:36 ` Yicong Yang
2024-12-20 7:53 ` [PATCH v10 2/4] arch_topology: Support SMT control for OF based system Yicong Yang
2024-12-23 16:33 ` Jonathan Cameron
2024-12-24 12:23 ` Yicong Yang
2024-12-20 7:53 ` [PATCH v10 3/4] arm64: topology: Support SMT control on ACPI " Yicong Yang
2024-12-23 16:40 ` Jonathan Cameron
2024-12-24 12:30 ` Yicong Yang
2024-12-20 7:53 ` [PATCH v10 4/4] arm64: Kconfig: Enable HOTPLUG_SMT Yicong Yang
2024-12-23 16:40 ` Jonathan Cameron
2024-12-26 9:23 ` Shrikanth Hegde [this message]
2024-12-26 11:50 ` [PATCH v10 0/4] Support SMT control on arm64 Yicong Yang
2024-12-26 12:28 ` Shrikanth Hegde
2024-12-27 7:16 ` Yicong Yang
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