From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 01F8F35DA6E for ; Wed, 23 Sep 2026 01:36:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790127363; cv=none; b=X9+GJMPWZD3lZh2/45Lok3AbnUksYuYVkHoF5UABsrFeZXXPHa6EsaYzDmfILJ98IXzoq8vGrNwCtzPRyEH5YJbGHq46X8xywggOtSyOlfdNyGOMI/jgGNMo0zlW9XRpI8VO+mHeeWAJOC5XkVkBT3TnjZNND0Gp6oSNA4VTo5k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790127363; c=relaxed/simple; bh=Zsas+kOeBrvx8YiDHjHvspyyn4WMbYRC5V4nQFgF6O0=; h=Date:To:From:Subject:Message-Id; b=YORE2eLkDBhmZTIQ0hxIcU/WLaw5PQ/QiPQo7WhNP7SL0aLVnKfd3kEjZimFjKv+EEX3zWbG2V1wwIBmZ3cYTekqq9RJdzsE2dak6atckGYYqAosEemCBxZd8SeOv7Taoi/w3XKVMvViAY4v6U6/faKPr3FXmI6HVyAT5WAVtTk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=b+1ZCvgc; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="b+1ZCvgc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 730E71F000FF; Wed, 23 Sep 2026 01:36:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1790127361; bh=oAzqddTkLWc8xA8fF8AbJrKVKDIxXn/QlL2g4FbBCmc=; h=Date:To:From:Subject; b=b+1ZCvgcHvQQPB3q6IkM493dXL+nqDjfIv7EG8pOGjOdc6IJSgZommTFw1pOvBhcO B83Y7LQa5la0v4ZGn6t3Pb+nIWAkMIxsZQPQbCHASM1sWkqhRHQkG1h+9gY6qQjygg JYUiU6Fx8u8UxefuWQ57UPePBTiPIA9+qwpAdtFA= Date: Tue, 22 Sep 2026 18:36:01 -0700 To: mm-commits@vger.kernel.org,ziy@nvidia.com,yosry@kernel.org,xlpang@linux.alibaba.com,usama.arif@linux.dev,shakeel.butt@linux.dev,roman.gushchin@linux.dev,qi.zheng@linux.dev,nphamcs@gmail.com,muchun.song@linux.dev,mkoutny@suse.com,mhocko@kernel.org,hannes@cmpxchg.org,david@kernel.org,david@fromorbit.com,chengming.zhou@linux.dev,baolin.wang@linux.alibaba.com,qinyuntan@linux.alibaba.com,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-list_lru-keep-per-memcg-lists-with-nokmem-for-nonslab-backed-lrus.patch added to mm-new branch Message-Id: <20260923013601.730E71F000FF@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm: list_lru: keep per-memcg lists with nokmem for NONSLAB-backed lrus has been added to the -mm mm-new branch. Its filename is mm-list_lru-keep-per-memcg-lists-with-nokmem-for-nonslab-backed-lrus.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-list_lru-keep-per-memcg-lists-with-nokmem-for-nonslab-backed-lrus.patch This patch will later appear in the mm-new branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Note, mm-new is a provisional staging ground for work-in-progress patches, and acceptance into mm-new is a notification for others take notice and to finish up reviews. Please do not hesitate to respond to review feedback and post updated versions to replace or incrementally fixup patches in mm-new. The mm-new branch of mm.git is not included in linux-next If a few days of testing in mm-new is successful, the patch will me moved into mm.git's mm-unstable branch, which is included in linux-next Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Qinyun Tan Subject: mm: list_lru: keep per-memcg lists with nokmem for NONSLAB-backed lrus Date: Thu, 10 Sep 2026 16:07:20 +0800 With cgroup.memory=nokmem, __list_lru_init() collapses every list_lru into per-node lists. That is fine for slab objects, which are not charged per memcg without kmem accounting. But a lru backed by a SHRINKER_NONSLAB shrinker, e.g. the THP deferred split queue or the zswap entries, holds user memory, which is charged regardless of nokmem. Collapsing such an lru loses the per-memcg view of its objects. Reclaim can no longer target just the cgroup under pressure. Keep such lrus memcg aware under nokmem when their backing shrinker is registered SHRINKER_NONSLAB. This leaves the savings of nokmem intact: slab-backed lrus (e.g. the superblock dentry/inode lrus) still fall back to the per-node lists, and the per-memcg lists are allocated only when a memcg actually holds such objects. Link: https://lore.kernel.org/20260910080722.3961351-3-qinyuntan@linux.alibaba.com Fixes: fafaeceb89a5 ("mm: switch deferred split shrinker to list_lru") Signed-off-by: Qinyun Tan Signed-off-by: Andrew Morton Reviewed-by: Johannes Weiner Cc: Michal Hocko Cc: Roman Gushchin Cc: Shakeel Butt Cc: Muchun Song Cc: Michal Koutný Cc: David Hildenbrand Cc: Zi Yan Cc: Baolin Wang Cc: Usama Arif Cc: Dave Chinner Cc: Qi Zheng Cc: Yosry Ahmed Cc: Nhat Pham Cc: Chengming Zhou Cc: Xunlei Pang --- mm/list_lru.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/mm/list_lru.c~mm-list_lru-keep-per-memcg-lists-with-nokmem-for-nonslab-backed-lrus +++ a/mm/list_lru.c @@ -677,7 +677,9 @@ int __list_lru_init(struct list_lru *lru else lru->shrinker_id = -1; - if (mem_cgroup_disabled() || mem_cgroup_kmem_disabled()) + if (mem_cgroup_disabled() || + (mem_cgroup_kmem_disabled() && + (!shrinker || !(shrinker->flags & SHRINKER_NONSLAB)))) memcg_aware = false; #endif _ Patches currently in -mm which might be from qinyuntan@linux.alibaba.com are mm-list_lru-disable-memcg-awareness-under-cgroup_disable=memory.patch mm-list_lru-dont-copy-stale-shrinker-id-from-non-memcg-aware-shrinkers.patch mm-memcontrol-drop-kmemcg_id-and-use-mem_cgroup_id-for-list_lru-indexing.patch mm-list_lru-keep-per-memcg-lists-with-nokmem-for-nonslab-backed-lrus.patch mm-thp-restore-shrinker_nonslab-on-the-deferred-split-shrinker.patch mm-zswap-mark-the-zswap-shrinker-shrinker_nonslab.patch