Data Access Monitoring Operator (DAMO): User-Space Tool/Python Library for Access-Aware Profiling and Optimization of Your Linux Systems
Talkat Open Source Summit Europe 2023 · on Tuesday, 2023-09-19· at 15:40· Room 0B (Floor 0), Abandoibarra Etorb., 4, 48011 Bilbao, Bizkaia, Spain·
summary
DAMON kernel subsystem provides region-based access sampling and adaptive region merging; DAMO is a Python user-space tool and library (PyPI, works on kernels 5.15+) that sends JSON parameters to DAMON and exposes commands: record (executes workload and saves heatmap), show (live snapshots filtered by access rate/age), and tune (apply DAMOS operation schemes like pageout, thp collapse, or prioritize on the active list). Reported results include up to 90% memory overhead reduction, 2.5× speedup under memory pressure, and 76% THP overhead cut while retaining 51% performance gain.
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chapters (24)
- 0:00Introduction
- 1:03Introduction
- 1:47Access awareness in memory
- 3:58Hierarchical memory challenges
- 5:42Memory access optimizations
- 7:30Introducing the Data Access Monitoring Operator
- 8:58DAMO usage basics
- 10:04Recording access patterns
- 13:55Offline profiling insights
- 15:44Live demo snapshots
- 20:04Automating reclamation
- 22:11Real-world DAMO optimizations
- 23:36DAMO and Daemon interaction
- 25:01DAMO-Daemon communication
- 29:24DAMO monitoring parameters
- 33:02Target configuration
- 34:54Frequency monitoring
- 36:59Adaptive region adjustment
- 39:31Overhead and accuracy tuning
- 39:54Memory management with DAMO
- 42:26DAMO production features
- 44:13DAMO community opportunities
- 47:07Conclusion
- 47:55Q&A
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