The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 05, 2016
Filed:
Nov. 25, 2013
Apple Inc., Cupertino, CA (US);
Hari S. Kannan, Sunnyvale, CA (US);
Brian P. Lilly, San Francisco, CA (US);
Perumal R. Subramoniam, San Jose, CA (US);
Pradeep Kanapathipillai, Santa Clara, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
Systems, methods, and apparatuses for reducing writes to the data array of a cache. A cache hierarchy includes one or more L1 caches and a L2 cache inclusive of the L2 cache(s). When a request from the L1 cache misses in the L2 cache, the L2 cache sends a fill request to memory. When the fill data returns from memory, the L2 cache delays writing the fill data to its data array. Instead, this cache line is written to the L1 cache and a clean-evict bit corresponding to the cache line is set in the L1 cache. When the L1 cache evicts this cache line, the L1 cache will write back the cache line to the L2 cache even if the cache line has not been modified.