linux-kernel - Re: [PATCH v2.1 2/2] x86/Documentation: Add documentation about cluster

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Date:   Sat, 15 Apr 2023 09:24:28 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     K Prateek Nayak <kprateek.nayak@....com>,
        linux-kernel@...r.kernel.org
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, hpa@...or.com, corbet@....net,
        jgross@...e.com, andrew.cooper3@...rix.com, peterz@...radead.org,
        Jason@...c4.com, thomas.lendacky@....com, puwen@...on.cn,
        x86@...nel.org, linux-doc@...r.kernel.org, oleksandr@...alenko.name
Subject: Re: [PATCH v2.1 2/2] x86/Documentation: Add documentation about
 cluster

On 4/14/23 10:17, K Prateek Nayak wrote:
> +  - cluster_id:
> +
> +    A per-CPU variable containing:
> +
> +      - Upper bits extracted from the APIC ID.  CPUs which have the same value
> +        in these bits share an L2 and have the same cluster_id.
> +
> +        CPUs for which cluster information is unavailable will show 65535
> +        (BAD_APICID) as the cluster_id.

"... return cluster_id of 65535 (BAD_APICID)."

>      The number of online threads is also printed in /proc/cpuinfo "siblings."
>  
> +  - topology_cluster_cpumask():
> +
> +    The cpumask contains all online threads in the cluster to which a thread
> +    belongs.
> +

Looks OK.

>      The physical package ID to which a thread belongs.
>  
> +  - topology_cluster_id();
> +
> +    The ID of the cluster to which a thread belongs.
> +

Looks OK.

Thanks.

-- 
An old man doll... just what I always wanted! - Clara