Paper Info
Title
FFCCD: fence-free crash-consistent concurrent defragmentation for persistent memory
Abstract
Persistent Memory (PM) is increasingly supplementing or substituting DRAM as main memory. Prior work have focused on reusability and memory leaks of persistent memory but have not addressed a problem amplified by persistence, persistent memory fragmentation , which refers to the continuous worsening of fragmentation of persistent memory throughout its usage. This paper reveals the challenges and proposes the first systematic crash-consistent solution, Fence-Free Crash-consistent Concurrent Defragmentation (FFCCD). FFCCD resues persistent pointer format, root nodes and typed allocation provided by persistent memory programming model to enable concurrent defragmentation on PM. FFCCD introduces architecture support for concurrent defragmentation that enables a fence-free design and fast read barrier, reducing two major overheads of defragmenting persistent memory. The techniques is effective (28--73% fragmentation reduction) and fast (4.1% execution time overhead).
Year
DOI
Venue
2022
10.1145/3470496.3527406
ISCA: International Symposium on Computer Architecture
Keywords
DocType
ISSN
Non-volatile memory, Persistent memory, Memory management, Garbage collection, Defragmentation
Conference
1063-6897
Citations 
PageRank 
References 
0
0.34
44
Authors
4
Name
Order
Citations
PageRank
Yuanchao Xu163.77
Chencheng Ye293.82
Yan Solihin32057111.56
Xipeng Shen42025118.55