linux-kernel - Re: [PATCH] LoongArch:support CONFIG_SCHED

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Message-ID: <f0d7965a0016f458bb06e2968c15d8eb46be296e.camel@xry111.site>
Date: Tue, 29 Apr 2025 19:44:44 +0800
From: Xi Ruoyao <xry111@...111.site>
To: Tianyang Zhang <zhangtianyang@...ngson.cn>, chenhuacai@...nel.org, 
	kernel@...0n.name, wanghongliang@...ngson.cn, yangtiezhu@...ngson.cn
Cc: loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] LoongArch:support CONFIG_SCHED_MC

On Tue, 2025-04-29 at 19:33 +0800, Tianyang Zhang wrote:
> From: wanghongliang <wanghongliang@...ngson.cn>
> 
> In order to achieve more reasonable load balancing behavior,
> support for SCHED_MC has been added.
> The LLC distribution of Loongarch now is consistent with numa-node,
> the balancing domain of SCHED_MC can effectively reduce the situation
> where processes are awakened to smt_slibing
> 
> Co-developed-by: wanghongliang <wanghongliang@...ngson.cn>
> Signed-off-by: wanghongliang <wanghongliang@...ngson.cn>
> Signed-off-by: Tianyang Zhang <zhangtianyang@...ngson.cn>
> ---
>  arch/loongarch/Kconfig                |  9 ++++++
>  arch/loongarch/include/asm/smp.h      |  1 +
>  arch/loongarch/include/asm/topology.h |  8 +++++
>  arch/loongarch/kernel/smp.c           | 46 +++++++++++++++++++++++++++
>  4 files changed, 64 insertions(+)
> 
> diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
> index 1a2cf012b..72a142a85 100644
> --- a/arch/loongarch/Kconfig
> +++ b/arch/loongarch/Kconfig
> @@ -493,6 +493,15 @@ config NR_CPUS
>  	  This allows you to specify the maximum number of CPUs which this
>  	  kernel will support.
>  
> +config SCHED_MC
> +	def_bool y
> +	prompt "Multi-core scheduler support"
> +	depends on SMP
> +	help
> +	  Multi-core scheduler support improves the CPU scheduler's decision
> +	  making when dealing with multi-core CPU chips at a cost of slightly
> +	  increased overhead in some places. If unsure say N here.

To me it's puzzling to say "if unsure say N here" while setting the
default to y.

-- 
Xi Ruoyao <xry111@...111.site>
School of Aerospace Science and Technology, Xidian University