NDLI: SuperCoP: a general, correct, and performance-efficient supervised memory system

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SuperCoP: a general, correct, and performance-efficient supervised memory system

Content Provider	ACM Digital Library
Author	Nagarajan, Vijay Cintra, Marcelo Rajaram, Bharghava McPherson, Andrew J.
Abstract	Supervised memory systems maintain additional metadata for each memory address accessed by the program, to control and monitor accesses to the program data. Supervised systems find use in several applications including memory checking, synchronization, race detection, and transactional memory. Conventional memory instructions are replaced by supervised memory instructions (SMIs) which operate on both data and metadata atomically. Existing proposals for supervised memory systems assume sequential consistency. Recently, Bobba et al. [4] demonstrated the correctness issues (imprecise exceptions and metadata read reordering) in naively applying supervision to Total-Store-Order, and proposed two solutions - TSOall and TSOdata - for overcoming the correctness issues. TSOall solves correctness issues by forcing SMIs to perform in order, but performs similar to SC, since supervised writes cannot retire into the write-buffer. TSOdata, while allowing supervised writes to retire into the write-buffer, works correctly for only a subset of supervision schemes. In this paper we observe that correctness is ensured as long as SMIs read and process their metadata in order. We propose SuperCoP, a supervised memory system for relaxed memory models in which SMIs read and process metadata before retirement, while allowing data and metadata writes to retire into the write-buffer. Since SuperCoP separates metadata reads and their processing from the writes, we propose a simple mechanism - in the form of cache block level locking at the directory - to ensure atomicity. Our experimental results show that SuperCoP performs better than TSOall by 16.8%. SuperCoP also performs better than TSOdata by 6%, even though TSOdata is not general.
Starting Page	85
Ending Page	94
Page Count	10
File Format	PDF
ISBN	9781450312158
DOI	10.1145/2212908.2212922
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2012-05-15
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Atomicity Metadata Memory ordering Memory trackers Supervised memory
Content Type	Text
Resource Type	Article

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