Android BOF
summary
Reclaim for the multi‑generation (mgu) LRU stalls when pages remain in a movable Zone one index larger than the requested zone, preventing the oldest generation from advancing and causing premature OOM kills; the pragmatic fix is to move pages between generations (older → next younger) like moving ineligible pages to the head of inactive, and a patch implements that. Also discussed: reclaim bails out when swap is full and a possible improvement is to check swap cache entries to avoid repeated rescans.
AI-written summary · about
chapters (8)
- 0:00Introduction to reclaim algorithm
- 3:25Premature OOM kills issue
- 5:36FD script page handling
- 8:04Protection trade-offs for file pages
- 9:30Swap full handling
- 10:36Early OOM kills impact
- 11:18Discardable memory usage
- 12:01Overshooting high watermark
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