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non-hierarchical stats on cgroup > v1, I brought it up previously [*]. I am not sure if this was addressed > but I couldn't immediately find anything. Hi, Yosry. Thanks for bringing this up! > In short, if memory is charged to a dying cgroup at the time of > reparenting, when the memory gets uncharged the stats updates will occur > at the parent. This will update both hierarchical and non-hierarchical > stats of the parent, which would corrupt the parent's non-hierarchical > stats (because those counters were never incremented when the memory was > charged). Hmm, I wonder if this only applies to LRU pages. In theory we should have this problem for NR_SLAB{UN,}RECLAIMABLE_B because we already reparent objcgs, or am I missing something? > [*]https://lore.kernel.org/all/CAJD7tkazvC*kZgGaV3idapQp-zPFaWBxoHwnrqTFoodHZGQcPA@mail.gmail.com/