Acclaim: Adaptive Memory Reclaim to Improve User Experience in Android Systems
summary
Acclaim implements a kernel reclaim policy with two concrete pieces: foreground aware eviction moves free pages from background apps to foreground ones, and lightweight prediction-based reclaim uses a lock-free sliding window predictor plus a moderator to shrink background reclaim size and frequency. Evaluation on 52 phones shows page re-faults can be ~31% of evictions and Acclaim cuts launch latency and boosts intensive-write throughput up to 49%. Runtime overhead is tiny: ~0.1% extra memory for per-page UID and ~400 bytes per 100-window.
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chapters (17)
- 0:00Intro
- 0:24Executive summary
- 2:06Android mobile device is popular Mobile devices are everywhere!
- 2:47Android inherits Linux kernel
- 3:33Breakdown Android I/O latency Android I/O Latency: read procedure as an example
- 5:15Page re-fault causes page thrashing
- 6:02Direct reclaim can much delay page allocation
- 7:12Analysis of Android memory reclaim
- 10:52Allocation sizes of mobile devices are usually small
- 12:02Foreground apps more important to user experience Background applications keep consuming free pages.
- 12:58Our Solution: Acclaim ► Design goals
- 14:06Lightweight prediction-based reclaim scheme (LWP)
- 16:15Foreground aware eviction (FAE)
- 17:53Evaluation results: read/write performance
- 18:39Evaluation results: app launching
- 19:03Evaluation results: overhead
- 19:57Conclusion
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