PMR: Fast Application Response via Parallel Memory Reclaim on Mobile Devices

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" summary

PMR is a kernel patch that decouples page shrinking from writeback and implements proactive page shrinking (PPS) plus storage-friendly page writeback (SPW) to batch unmaps and drive bulk I/O. Implemented and measured on Pixel 6 Pro, Pixel 5 and Redmi Note 11 with 36 real apps, it doubles reclaim throughput (previous peaks ~120 MB/s), cuts app response latency up to 43.6%, and further reduces latency 38% when combined with FLEET.

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" chapters (12)

1. 0:00Introduction
2. 1:01Talk structure and background
3. 2:33Android memory reclaim methods
4. 4:22Low memory killer problems
5. 6:12Bottlenecks in memory reclaim
6. 8:02Page shrinking inefficiencies
7. 9:26Memory reclaim challenges
8. 9:48PMR parallel reclaim scheme
9. 10:32PMR design details
10. 11:33Experimental results
11. 12:59Sensitivity study
12. 13:19Conclusion