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v2 2026-11-03

memcg shrinker 按需分配 · v2

将每 memcg 的 shrinker_info_unit 改为 xarray 存储并按需分配，避免为未使用 shrinker 预分配内存。

原始补丁链接

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子 Patch（2）

1/2
mm/shrinker: keep the per-memcg shrinker units in an xarray
Every memory cgroup keeps, per NUMA node, an array of pointers to its shrinker_info_units, sized for shrinker_nr_max ids. shrinker_nr_max is the highest memcg-aware shrinker id ever handed out; every
2/2
mm/shrinker: allocate the per-memcg shrinker units on demand
Instead of a shrinker_info_unit for every SHRINKER_UNIT_BITS ids up to shrinker_nr_max on every NUMA node, give a memory cgroup only the units of the shrinkers it or one of its descendants holds a lis
← v1