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Dec 23, 2025 at 08:04:50PM +0000, Yosry Ahmed wrote: > > > > > > > > I think there might be a problem with 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? > > We do, but we don't expose these stats in cgroup v1, and we don't expose non-hierarchical stats in cgroup v2. Oops, right. I was missing that. Thanks! -- Cheers, Harry / Hyeonggon