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

[Mario Limonciello]

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")