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")
