On Stacking a Persistent Memory File System on Legacy File Systems

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" summary

SPFS stacks a persistent memory layer on top of legacy file systems (ext4, f2fs, xfs) and exposes NVMM (Intel DCPMM, MBDM) as a persistent writeback cache that absorbs small, order‑preserving synchronous writes while delegating other I/O to the underlying FS. It implements metadata in dynamic hash tables and a novel Extent Hashing scheme, uses a SyncPoint profiler to promote/demote extents, is evaluated on 256 GB DCPMM and 16 GB MBDM machines, and speeds lower file systems up to 9.9×.

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" chapters (8)

1. 0:00Start
2. 4:31Lazy Sync Point Profiler
3. 5:36Example: Eager Write Point Profiling vs. Lazy Sync Point Profiling
4. 8:14Migration to Lower File System
5. 10:26Extent Hashing: Insert
6. 12:50Experimental Setup
7. 13:20Extent Hashing: Comparison of file mapping structures
8. 15:00Performance Effect of Stacking SPFS on x