linux-kernel - Re: [PATCH v2 00/13] Add support for AMD hardware feedback interface

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Message-ID: <Zwh3Ky9Qoe6si1qC@archie.me>
Date: Fri, 11 Oct 2024 07:54:03 +0700
From: Bagas Sanjaya <bagasdotme@...il.com>
To: Mario Limonciello <mario.limonciello@....com>,
	Borislav Petkov <bp@...en8.de>, Hans de Goede <hdegoede@...hat.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: 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 v2 00/13] Add support for AMD hardware feedback interface

On Thu, Oct 10, 2024 at 02:36:52PM -0500, Mario Limonciello wrote:
> The AMD Heterogeneous core design and Hardware Feedback Interface (HFI)
> provide behavioral classification and a dynamically updated ranking table
> for the scheduler to use when choosing cores for tasks.
> 
> Threads are classified during runtime into enumerated classes.
> Currently, the driver supports 3 classes (0 through 2). These classes
> represent thread performance/power characteristics that may benefit from
> special scheduling behaviors. The real-time thread classification is
> consumed by the operating system and is used to inform the scheduler of
> where the thread should be placed for optimal performance or energy efficiency.
> 
> The thread classification helps to select CPU from a ranking table that describes
> an efficiency and performance ranking for each classification from two dimensions.
> 
> The ranking data provided by the ranking table are numbers ranging from 0 to 255,
> where a higher performance value indicates higher performance capability and a higher
> efficiency value indicates greater efficiency. All the CPU cores are ranked into
> different class IDs. Within each class ranking, the cores may have different ranking
> values. Therefore, picking from each classification ID will later allow the scheduler
> to select the best core while threads are classified into the specified workload class.
> 
> This series was originally submitted by Perry Yuan [1] but he is now doing a different
> role and he asked me to take over.

Sorry but can you specify the base commit/tree of this series? I can't apply
it on top of current platform-drivers-x86.git, though.

Confused...

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

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