公开(公告)号：US10599481B2

公开(公告)日：2020-03-24

申请号：US15870770

申请日：2018-01-12

Applicant: Apple Inc.

Inventor： Constantin Pistol ,  Daniel A. Chimene ,  Jeremy C. Andrus ,  Russell A. Blaine ,  Kushal Dalmia

IPC: G06F9/50 ,  G06F9/48 ,  G06F1/3234 ,  G06F1/329 ,  G06F1/3296 ,  G06F9/38 ,  G06F9/26 ,  G06F9/54 ,  G06F1/20 ,  G06F1/324 ,  G06F1/3206 ,  G06F9/30

Abstract: Systems and methods are disclosed for scheduling threads on a processor that has at least two different core types, such as an asymmetric multiprocessing system. Each core type can run at a plurality of selectable voltage and frequency scaling (DVFS) states. Threads from a plurality of processes can be grouped into thread groups. Execution metrics are accumulated for threads of a thread group and fed into a plurality of tunable controllers for the thread group. A closed loop performance control (CLPC) system determines a control effort for the thread group and maps the control effort to a recommended core type and DVFS state. A closed loop thermal and power management system can limit the control effort determined by the CLPC for a thread group, and limit the power, core type, and DVFS states for the system. Deferred interrupts can be used to increase performance.

公开(公告)号：US09772959B2

公开(公告)日：2017-09-26

申请号：US14292123

申请日：2014-05-30

Applicant: Apple Inc.

Inventor： Russell A. Blaine ,  Kushal Dalmia ,  Joseph Sokol, Jr. ,  Andrew W. Vogan ,  Matthew J. Byom

IPC: G06F13/18 ,  G06F3/06 ,  G06F13/38 ,  G06F9/00

CPC classification number: G06F13/18 ,  G06F3/0611 ,  G06F3/0659 ,  G06F3/0688 ,  G06F9/00 ,  G06F13/385

Abstract: In one embodiment, input-output (I/O) scheduling system detects and resolves priority inversions by expediting previously dispatched requests to an I/O subsystem. In response to detecting the priority inversion, the system can transmit a command to expedite completion of the blocking I/O request. The pending request can be located within the I/O subsystem and expedited to reduce the pendency period of the request.