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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu Sep 3, 2026 at 11:35 PM EDT, Qinyun Tan wrote: > On a system booted with cgroup.memory=3Dnokmem, the deferred split > shrinker is quietly demoted to a non-memcg-aware one. As a result, > partially unmapped THPs are only split under global reclaim; memcg > (limit-induced) reclaim never splits them, so a cgroup under memory > pressure keeps its underused THPs intact. > > This is a regression from commit fafaeceb89a5 ("mm: switch deferred > split shrinker to list_lru"), which re-registered the shrinker without > SHRINKER_NONSLAB. The shrinker had carried this flag since commit > 0a432dcbeb32 ("mm: shrinker: make shrinker not depend on memcg kmem") > precisely so it would keep working with kmem accounting disabled. > Without the flag, shrinker_memcg_alloc() fails with -ENOSYS under > nokmem and the shrinker loses its memcg awareness. > > This was noticed by Michal during review of the patch "mm/list_lru: > don't copy stale shrinker id from non-memcg-aware shrinkers" [1]. > > Restore the flag. > > [1] https://lore.kernel.org/lkml/697713c4-0857-485b-aba7-c74f37a3c8b4@lin= ux.alibaba.com/ > > Fixes: fafaeceb89a5 ("mm: switch deferred split shrinker to list_lru") > Suggested-by: Michal Koutn=C3=BD > Signed-off-by: Qinyun Tan > --- > mm/huge_memory.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > Makes sense. Acked-by: Zi Yan --=20 Best Regards, Yan, Zi