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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <6d7e5cc5-db07-423b-b39c-0de213fedaf5@amd.com>
Date: Thu, 10 Oct 2024 20:29:47 -0500
From: Mario Limonciello <mario.limonciello@....com>
To: Bagas Sanjaya <bagasdotme@...il.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 10/10/2024 19:54, Bagas Sanjaya wrote:
> 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...
> 

Sorry about that.  As it crosses a few subsystems it will require some 
coordination to properly land once it has review comments.

It's (currently) based off:
https://git.kernel.org/pub/scm/linux/kernel/git/superm1/linux.git/log/?h=linux-next

commit 57533bc760ae ("cpufreq/amd-pstate: Fix non kerneldoc comment")