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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