linux-kernel - Re: [PATCH v13 5/8] x86/resctrl: Add node-scope to the options for feature scope

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Date:   Mon, 4 Dec 2023 17:04:11 -0600
From:   "Moger, Babu" <bmoger@....com>
To:     Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Peter Newman <peternewman@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Shuah Khan <skhan@...uxfoundation.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>,
        Randy Dunlap <rdunlap@...radead.org>,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        patches@...ts.linux.dev, Shaopeng Tan <tan.shaopeng@...fujitsu.com>
Subject: Re: [PATCH v13 5/8] x86/resctrl: Add node-scope to the options for
 feature scope


On 12/4/2023 12:53 PM, Tony Luck wrote:
> Currently supported resctrl features are all domain scoped the same as the
> scope of the L2 or L3 caches.
>
> Add RESCTRL_NODE as a new option for features that are scoped at the
> same granularity as NUMA nodes. This is needed for Intel's Sub-NUMA
> Cluster (SNC) feature where monitoring features are node scoped.
>
> Signed-off-by: Tony Luck<tony.luck@...el.com>
> Tested-by: Shaopeng Tan<tan.shaopeng@...fujitsu.com>
> Reviewed-by: Peter Newman<peternewman@...gle.com>
> Reviewed-by: Reinette Chatre<reinette.chatre@...el.com>
> Reviewed-by: Shaopeng Tan<tan.shaopeng@...fujitsu.com>
Reviewed-by: Babu Moger <babu.moger@....com>
> ---
>   include/linux/resctrl.h            | 1 +
>   arch/x86/kernel/cpu/resctrl/core.c | 2 ++
>   2 files changed, 3 insertions(+)
>
> diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
> index 058a940c3239..b8a3a11b970d 100644
> --- a/include/linux/resctrl.h
> +++ b/include/linux/resctrl.h
> @@ -170,6 +170,7 @@ struct resctrl_schema;
>   enum resctrl_scope {
>   	RESCTRL_L2_CACHE = 2,
>   	RESCTRL_L3_CACHE = 3,
> +	RESCTRL_NODE,
>   };
>   
>   /**
> diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
> index 797cb3bf417a..c9315ce8f7bd 100644
> --- a/arch/x86/kernel/cpu/resctrl/core.c
> +++ b/arch/x86/kernel/cpu/resctrl/core.c
> @@ -502,6 +502,8 @@ static int get_domain_id_from_scope(int cpu, enum resctrl_scope scope)
>   	case RESCTRL_L2_CACHE:
>   	case RESCTRL_L3_CACHE:
>   		return get_cpu_cacheinfo_id(cpu, scope);
> +	case RESCTRL_NODE:
> +		return cpu_to_node(cpu);
>   	default:
>   		break;
>   	}