From: Dietmar Eggemann <dietmar.eggemann@arm.com>
To: Yicong Yang <yangyicong@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
Cc: linuxppc-dev@lists.ozlabs.org, x86@kernel.org,
linux-kernel@vger.kernel.org, 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
Subject: Re: [PATCH v5 1/4] cpu/SMT: Provide a default topology_is_primary_thread()
Date: Fri, 16 Aug 2024 17:54:39 +0200 [thread overview]
Message-ID: <9c46d5f0-f4ff-461b-b483-840fab6dfecc@arm.com> (raw)
In-Reply-To: <20240806085320.63514-2-yangyicong@huawei.com>
On 06/08/2024 10:53, Yicong Yang wrote:
> From: Yicong Yang <yangyicong@hisilicon.com>
>
> Currently if architectures want to support HOTPLUG_SMT they need to
> provide a topology_is_primary_thread() telling the framework which
> thread in the SMT cannot offline. However arm64 doesn't have a
> restriction on which thread in the SMT cannot offline, a simplest
> choice is that just make 1st thread as the "primary" thread. So
> just make this as the default implementation in the framework and
> let architectures like x86 that have special primary thread to
> override this function.
IMHO, ARM64 (/ARM), RISCV and PARISC (SMP) use GENERIC_ARCH_TOPOLOGY
(and drivers/base/arch_topology.c) so they could share
topology_is_primary_thread() also there?
[...]
next prev parent reply other threads:[~2024-08-16 15:54 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-06 8:53 [PATCH v5 0/4] Support SMT control on arm64 Yicong Yang
2024-08-06 8:53 ` [PATCH v5 1/4] cpu/SMT: Provide a default topology_is_primary_thread() Yicong Yang
2024-08-16 15:54 ` Dietmar Eggemann [this message]
2024-08-19 7:25 ` Yicong Yang
2024-08-06 8:53 ` [PATCH v5 2/4] arch_topology: Support SMT control for OF based system Yicong Yang
2024-08-16 15:55 ` Dietmar Eggemann
2024-08-19 7:18 ` Yicong Yang
2024-08-06 8:53 ` [PATCH v5 3/4] arm64: topology: Support SMT control on ACPI " Yicong Yang
2024-08-16 15:55 ` Dietmar Eggemann
2024-08-19 7:03 ` Yicong Yang
2024-08-22 7:19 ` Dietmar Eggemann
2024-08-27 15:40 ` Pierre Gondois
2024-08-29 7:40 ` Yicong Yang
2024-08-29 12:46 ` Pierre Gondois
2024-08-30 9:35 ` Yicong Yang
2024-09-02 7:43 ` Pierre Gondois
2024-09-03 12:44 ` Yicong Yang
2024-09-05 8:34 ` Pierre Gondois
2024-09-05 12:02 ` Yicong Yang
2024-09-06 7:06 ` Morten Rasmussen
2024-09-06 8:36 ` Yicong Yang
2024-09-12 11:59 ` Morten Rasmussen
2024-09-12 12:53 ` Michal Suchánek
2024-08-06 8:53 ` [PATCH v5 4/4] arm64: Kconfig: Enable HOTPLUG_SMT Yicong Yang
2024-08-27 15:40 ` Pierre Gondois
2024-08-29 6:50 ` Yicong Yang
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