Storage

FlashVM: Virtual Memory Management on Flash

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Executive Summary

With the decreasing price of flash memory, systems will increasingly use solid-state storage for virtual-memory paging rather than disks. FlashVM is a system architecture and a core virtual memory subsystem built in the Linux kernel that uses dedicated flash for paging. FlashVM focuses on three major design goals for memory management on flash: high performance, reduced flash wear out for improved reliability, and efficient garbage collection. FlashVM modifies the paging system along code paths for allocating, reading and writing back pages to optimize for the performance characteristics of flash. It also reduces the number of page writes using zero-page sharing and page sampling that prioritize the eviction of clean pages.

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