公开(公告)号：US10360158B2

公开(公告)日：2019-07-23

申请号：US15616917

申请日：2017-06-07

Applicant: Samsung Electronics Co., Ltd.

Inventor： Eric C. Quinnell ,  Kevin C. Heuer ,  Tarun Nakra ,  Akhil Arunkumar

IPC: G06F12/123 ,  G06F12/0815 ,  G06F12/0891 ,  G06F12/0862

Abstract: Embodiments of the present system and method provide cache replacement in a victim exclusive cache using a snoop filter where replacement information is not lost during a re-reference back to the CPU. Replacement information is stored in a snoop filter, meaning that historical access data may be fully preserved and allows for more flexibility in the LLC re-insertion points, without additional bits stored in a L2 cache. The present system and method further include snoop filter replacement technique. The present system and method passes replacement information between a snoop filter and a victim exclusive cache (e.g., LLC) when transactions move cachelines to and from a master CPU. This maintains and advances existing replacement information for a cacheline that is removed from the victim exclusive cache on a read, as well as intelligently replaces and ages cachelines in the snoop filter.