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AM, Shakeel Butt wrote: > > On Tue, 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. > > > > Sigh, the curse of memcg-v1. Let's see what we can do to not break v1. > > The memcg-v1 was originally planned to be removed, could we skip > supporting v1? You mean not reparenting LRU pages if CONFIG_MEMCG_V1 is set? That may work, but IMHO given that there is no clear timeline for removal yet (some v1-specific features have been officially deprecated, but memcg v1 as a whole hasn't), implementing Shakeel's suggestion [1] may be a good option (it doesn't seem to add much complexity) But it can be argued that it's not good enough reason to delay the series; adding support for V1 later sounds sensible to me. Anyway I'm fine either way and I'm not a memcg maintainer myself, so this is just my two cents. [1] https://lore.kernel.org/linux-mm/wvj4w7ifmrifnh5bvftdziudsj52fdnwlhbt2oifwmxmi4eore@ob3mrfahhnm5/ -- Cheers, Harry / Hyeonggon