FlexMem: Adaptive Page Profiling and Migration for Tiered Memory

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" summary

FlexMem is a page-profiling and migration system that combines performance-counter and fault-hint profiling to catch both long-lived and emerging hot pages, uses a formula to set a dynamic demotion watermark to cut promotion failures, and continuously adjusts a warm-page range by tracking page-shift ratios. Implemented on Intel servers with 30 GB fast memory and 768 GB persistent memory, it outperforms Tiering-0.8, TPP, and MEMTIS by 32%, 23%, and 27% on average across 64–133 GB workloads and noticeably reduces promotion failures.

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" chapters (10)

1. 0:00FlexMem and tiered memory
2. 1:05Tiered memory components
3. 3:14Profiling methods and promotion
4. 6:11FlexMem adaptive solutions
5. 7:57Performance-count profiling
6. 9:28Adaptive demotion
7. 12:15Adaptive one-page set
8. 13:39Evaluation and benchmarks
9. 15:50Seno inmemory database case study
10. 16:52Conclusion