linux-kernel - Re: [PATCH 3/7] x86/resctrl: Add a new node-scoped resource to rdt_resources

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Date:   Fri, 27 Jan 2023 05:24:54 +0000
From:   "Yu, Fenghua" <fenghua.yu@...el.com>
To:     "Luck, Tony" <tony.luck@...el.com>,
        "Chatre, Reinette" <reinette.chatre@...el.com>,
        Peter Newman <peternewman@...gle.com>,
        "Jonathan Corbet" <corbet@....net>,
        "x86@...nel.org" <x86@...nel.org>
CC:     Shaopeng Tan <tan.shaopeng@...itsu.com>,
        James Morse <james.morse@....com>,
        Jamie Iles <quic_jiles@...cinc.com>,
        Babu Moger <babu.moger@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "patches@...ts.linux.dev" <patches@...ts.linux.dev>
Subject: Re: [PATCH 3/7] x86/resctrl: Add a new node-scoped resource to
 rdt_resources_all[]

Hi, Tony,

On 1/26/23 10:41, Tony Luck wrote:
> Add a placeholder in the array of struct rdt_hw_resource to be used
> for event monitoring of systems with Sub-NUMA Cluster enabled.
> 
> Update get_domain_id() to handle SCOPE_NODE.
> 
> Signed-off-by: Tony Luck <tony.luck@...el.com>
> ---
>   arch/x86/kernel/cpu/resctrl/internal.h |  2 ++
>   arch/x86/kernel/cpu/resctrl/core.c     | 12 ++++++++++++
>   2 files changed, 14 insertions(+)
> 
> diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
> index 15cea517efaa..39a62babd60b 100644
> --- a/arch/x86/kernel/cpu/resctrl/internal.h
> +++ b/arch/x86/kernel/cpu/resctrl/internal.h
> @@ -409,12 +409,14 @@ enum resctrl_res_level {
>   	RDT_RESOURCE_L3,
>   	RDT_RESOURCE_L2,
>   	RDT_RESOURCE_MBA,
> +	RDT_RESOURCE_NODE,
>   
>   	/* Must be the last */
>   	RDT_NUM_RESOURCES,
>   };
>   
>   enum resctrl_scope {
> +	SCOPE_NODE,
>   	SCOPE_L2_CACHE = 2,
>   	SCOPE_L3_CACHE = 3
>   };
> diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
> index 6914232acf84..19be6fe42ef3 100644
> --- a/arch/x86/kernel/cpu/resctrl/core.c
> +++ b/arch/x86/kernel/cpu/resctrl/core.c
> @@ -100,6 +100,16 @@ struct rdt_hw_resource rdt_resources_all[] = {
>   			.fflags			= RFTYPE_RES_MB,
>   		},
>   	},
> +	[RDT_RESOURCE_NODE] =
> +	{
> +		.r_resctrl = {
> +			.rid			= RDT_RESOURCE_NODE,
> +			.name			= "L3",
"L3" was named as RDT_RESOURCE_L3 already. The duplicate name here may
cause duplicate file names in info dir. Maybe rename it as "L3_NODE"?

> +			.scope			= SCOPE_NODE,
> +			.domains		= domain_init(RDT_RESOURCE_NODE),
> +			.fflags			= RFTYPE_RES_MB,

I'm not sure if fflags is RFTYPE_RES_MB | RFTYPE_RES_L3 for both cache
and MB?

> +		},
> +	},
>   };
>   
>   /*
> @@ -464,6 +474,8 @@ static int arch_domain_mbm_alloc(u32 num_rmid, struct rdt_hw_domain *hw_dom)
>   
>   static int get_domain_id(int cpu, enum resctrl_scope scope)
>   {
> +	if (scope == SCOPE_NODE)
> +		return cpu_to_node(cpu);
>   	return get_cpu_cacheinfo_id(cpu, scope);
>   }
>   

Thanks.

-Fenghua