linux-kernel - Re: [PATCH] x86/topology: Document cpu_llc

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Date:   Wed, 7 Sep 2016 12:36:41 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86/topology: Document cpu_llc_id

On Wed, Sep 07, 2016 at 11:22:19AM +0200, Borislav Petkov wrote:
> From: Borislav Petkov <bp@...e.de>
> 
> It means different things on Intel and AMD so write it down so that
> there's no confusion.
> 
> Signed-off-by: Borislav Petkov <bp@...e.de>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> ---
>  Documentation/x86/topology.txt | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/x86/topology.txt b/Documentation/x86/topology.txt
> index 06afac252f5b..7a5485730476 100644
> --- a/Documentation/x86/topology.txt
> +++ b/Documentation/x86/topology.txt
> @@ -63,6 +63,12 @@ The topology of a system is described in the units of:
>      The maximum possible number of packages in the system. Helpful for per
>      package facilities to preallocate per package information.
>  
> +  - cpu_llc_id:
> +
> +    A per-CPU variable containing:
> +    - On Intel, the first APIC ID of the list of CPUs sharing the Last Level
> +    Cache
> +    - On AMD, the Node ID containing the Last Level Cache.

And there are no AMD parts where there are multiple LLCs on a Node? Like
where there isn't an L3 and the L2 is only per cluster?