MedFS: Pursuing Low Update Overhead via Metadata-Enabled Delta Compression for...
summary
MedFS implements metadata-aware delta compression on f2fs by embedding small XOR-derived deltas into unused inode inline space and spilling larger or evicted deltas to a complementary DCM area, with a delta-inlining DCI path that encodes tiny diffs with run-length/LZO style compression. It runs on a smartphone prototype, enforces base-before-delta write ordering for recovery, and reports a 55.1% average write traffic reduction, 122.7% longer flash endurance and up to 37.3% I/O performance gain.
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chapters (11)
- 0:00MedFS introduction
- 2:06Write stress reduction motivation
- 3:51Limitations of write stress methods
- 5:42Mobile I/O workload analysis
- 7:58MedFS architecture overview
- 9:27Delta Compression Inlining
- 10:55Handling inline overflow with Delta replacement
- 12:25Delta Compression Manager
- 13:53Consistency and recovery in MedFS
- 15:01Experimental results
- 17:10MedFS benefits summary
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