Иллюстрация: Алексей Майшев / РИА Новости
The first – zswap_shrinker_count() (and its companion zswap_shrinker_scan()) – exist as part of the dynamic shrinker. It is triggered independently by memory reclaimers (like kswapd, direct reclaimers, and by proactive reclaimers like Senpai), not by pool limits. Its job is to dynamically size the zswap pool based on memory access patterns, compressibility, and memory pressure, with the goal that you ideally never hit the static pool limits at all. In practice in production at Meta, hitting the static pool limit is rare, because this dynamic shrinker keeps things in check before they get that far. On memory-constrained systems like laptops, you may see it more.
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