公开(公告)号：US20250093932A1

公开(公告)日：2025-03-20

申请号：US18468467

申请日：2023-09-15

Applicant: Apple Inc.

Inventor： John G. DORSEY ,  Bryan R. Hinch ,  Ronit Banerjee ,  Karthic A. Palaniappan

IPC: G06F1/28

Abstract: Some embodiments include a system, apparatus, method, and computer program product for memory hierarchy power management. Some embodiments include a performance controller that balances memory hierarchy power and compute power to maintain package-level power efficiency of a systems-on-a-chip (SoC)-memory package. The performance controller can determine a ratio of memory hierarchy power to compute agent power, compare the ratio against a threshold value, and based on the comparison, determine how to manage memory hierarchy power. When the energy costs of the memory hierarchy power are large relative to the energy costs of the compute agent power, some embodiments include changing a performance state of a fabric and/or memory to increase the power efficiency of the overall SoC-memory package, even though a number of memory stall cycles experienced by the compute agent may increase.

公开(公告)号：US12147839B2

公开(公告)日：2024-11-19

申请号：US17392929

申请日：2021-08-03

Applicant: Apple Inc.

Inventor： John G. Dorsey ,  Bryan R. Hinch ,  Ronit Banerjee ,  Kushal Dalmia ,  Daniel A. Chimene ,  Jaidev P. Patwardhan

IPC: G06F9/50 ,  G06F9/48 ,  G06F11/14

Abstract: Embodiments include an asymmetric multiprocessing (AMP) system having a first central processing unit (CPU) cluster comprising a first core type, and a second CPU cluster comprising a second core type, where the AMP system can update a thread metric for a first thread running on the first CPU cluster based at least on: a past shared resource overloaded metric of the first CPU cluster, and on-core metrics of the first thread. The on-core metrics can indicate that first thread contributes to contention of the same shared resource corresponding to the past shared resource overloaded metric of the first CPU cluster. The AMP system can assign the first thread to a different CPU cluster while other threads of the same thread group remain assigned to the first CPU cluster. The thread metric can include a Matrix Extension (MX) thread flag or a Bus Interface Unit (BIU) thread flag.