linux-kernel - Re: [PATCH v3 03/14] x86/cpufeatures: add X86_FEATURE_WORKLOAD

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Message-ID: <20241022124202.GHZxedmqPeFd5F3sL3@fat_crate.local>
Date: Tue, 22 Oct 2024 14:42:02 +0200
From: Borislav Petkov <bp@...en8.de>
To: Mario Limonciello <mario.limonciello@....com>
Cc: Hans de Goede <hdegoede@...hat.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	x86@...nel.org, "Gautham R . Shenoy" <gautham.shenoy@....com>,
	Perry Yuan <perry.yuan@....com>, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-pm@...r.kernel.org,
	platform-driver-x86@...r.kernel.org,
	Shyam Sundar S K <Shyam-sundar.S-k@....com>
Subject: Re: [PATCH v3 03/14] x86/cpufeatures: add X86_FEATURE_WORKLOAD_CLASS
 feature bit

On Tue, Oct 15, 2024 at 04:36:34PM -0500, Mario Limonciello wrote:
> From: Perry Yuan <perry.yuan@....com>
> 
> Add new feature bit that indicates support for workload based
> heuristic feedback to OS for scheduling decisions.
> When the bit set, threads are classified during runtime into
> enumerated classes. The classes represent thread performance/power
> characteristics that may benefit from special scheduling behaviors.
> 
> Signed-off-by: Perry Yuan <perry.yuan@....com>
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
> ---
>  arch/x86/include/asm/cpufeatures.h | 1 +
>  arch/x86/kernel/cpu/scattered.c    | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
> index cea1ed82aeb4..3e8e67b8ec7a 100644
> --- a/arch/x86/include/asm/cpufeatures.h
> +++ b/arch/x86/include/asm/cpufeatures.h
> @@ -474,6 +474,7 @@
>  #define X86_FEATURE_CLEAR_BHB_LOOP_ON_VMEXIT (21*32+ 4) /* Clear branch history at vmexit using SW loop */
>  #define X86_FEATURE_FAST_CPPC		(21*32 + 5) /* AMD Fast CPPC */
>  #define X86_FEATURE_HETERO_CORE_TOPOLOGY	(21*32 + 6) /* Heterogeneous Core Topology */
> +#define X86_FEATURE_WORKLOAD_CLASS	(21*32 + 7) /* Workload Classification */

As already discussed: X86_FEATURE_AMD_WORKLOAD_CLASS

-- 
Regards/Gruss,
    Boris.

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