Data memory-dependent prefetcher: Difference between revisions

Revision as of 23:12, 25 March 2024

Revision as of 22:45, 30 March 2024

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{{Short description|CPU architecture component}}

A '''data memory-dependent prefetcher''' ('''DMP''') is a [[Prefetching (computing)|cache prefetcher]] that looks at [[Cache (computing)|cache memory]] content for possible [[Pointer (computer programming)|pointer]] values, and prefetches the data at those locations into cache if it sees memory access patterns that suggest following those pointers would be useful.<ref name=":0">{{Cite web |date=2022-05-02 |title=Augury: Using Data Memory-Dependent Prefetchers to Leak Data at Rest |url=httphttps://www.prefetchers.info/ |access-date=2024-03-2130 |website=www.prefetchers.info}}</ref><ref>{{Cite journalconference |last=Vicarte |first=Jose Rodrigo Sanchez |last2=Flanders |first2=Michael |last3=Paccagnella |first3=Riccardo |last4=Garrett-Grossman |first4=Grant |last5=Morrison |first5=Adam |last6=Fletcher |first6=Christopher W. |last7=Kohlbrenner |first7=David |date=May 2022 |title=Augury: Using Data Memory-Dependent Prefetchers to Leak Data at Rest |url=https://ieeexplore.ieee.org/document/9833570 |conference=2022 IEEE Symposium on Security and Privacy (SP) |conference-url=https://ieeexplore.ieee.org/xpl/conhome/9833550/proceeding |___location=San Francisco, CA, USA |publisher=IEEE |pages=1491–1505 |doi=10.1109/SP46214.2022.9833570 |isbn=978-1-6654-1316-9}}</ref>

As of 2022, data prefetching was already a common feature in CPUs,<ref>{{Citation |last=Bakhshalipour |first=Mohammad |title=A Survey on Recent Hardware Data Prefetching Approaches with An Emphasis on Servers |date=2020-09-01 |url=http://arxiv.org/abs/2009.00715 |access-date=2024-03-21 |doi=10.48550/arXiv.2009.00715 |last2=Shakerinava |first2=Mehran |last3=Golshan |first3=Fatemeh |last4=Ansari |first4=Ali |last5=Lotfi-Karman |first5=Pejman |last6=Sarbazi-Azad |first6=Hamid}}</ref> but most prefetchers do not inspect the data within the cache for pointers, instead working by monitoring memory access patterns. Data memory-dependent prefetchers take this one step further.