From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from dggsgout12.his.huawei.com (dggsgout12.his.huawei.com [45.249.212.56]) (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 12E6D2FE59C; Tue, 9 Dec 2025 01:41:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.56 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765244475; cv=none; b=mWQeeYHA2u+/H+WlKP+PXQ+l/80mClhOCljZKi1npVhwhywV16/X995tKETe+Da3GzUp0SgyjR7SbGzmmgh4LRAq25ZPBEIjjhENly/vgVwvtQHlLc+ANfifF2pxk1epuFHdf/IpC+149RTAsu/wH9b+lZdQThkmg5+yVVYMB2Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765244475; c=relaxed/simple; bh=0105pBY1ohCG8qmHrwhoXva//9/RsKnAMwO8OytJUU0=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version:Content-Type; b=M0KFdENMAWKig/X4jsrbbnKXJGyij4G4V7wYNbrypMVmPz6hZg4bWBItBrMWs9raJDMdAH72wUw/hPWW5PkmewCcsSdX6qqdZ5sa/PeYvQx19TPCznMhkdOQU3p2fveU3brZaPF4z6V/G+fy1Nd4AxFKNseX4gvYsl7ZpA57so4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com; spf=pass smtp.mailfrom=huaweicloud.com; arc=none smtp.client-ip=45.249.212.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huaweicloud.com Received: from mail.maildlp.com (unknown [172.19.163.216]) by dggsgout12.his.huawei.com (SkyGuard) with ESMTPS id 4dQM3w6wpzzKHMHr; Tue, 9 Dec 2025 09:40:12 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.75]) by mail.maildlp.com (Postfix) with ESMTP id C974F1A1537; Tue, 9 Dec 2025 09:41:10 +0800 (CST) Received: from hulk-vt.huawei.com (unknown [10.67.174.121]) by APP2 (Coremail) with SMTP id Syh0CgBnRlAafjdpkF9fBA--.23909S2; Tue, 09 Dec 2025 09:41:08 +0800 (CST) From: Chen Ridong To: akpm@linux-foundation.org, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, david@kernel.org, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com, corbet@lwn.net, hannes@cmpxchg.org, roman.gushchin@linux.dev, shakeel.butt@linux.dev, muchun.song@linux.dev, zhengqi.arch@bytedance.com Cc: linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, lujialin4@huawei.com, chenridong@huaweicloud.com, zhongjinji@honor.com Subject: [PATCH -next 0/5] mm/mglru: remove memcg lru Date: Tue, 9 Dec 2025 01:25:52 +0000 Message-Id: <20251209012557.1949239-1-chenridong@huaweicloud.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-CM-TRANSID:Syh0CgBnRlAafjdpkF9fBA--.23909S2 X-Coremail-Antispam: 1UD129KBjvJXoW7tFW3Kr4rAF43Xr4rtw4rGrg_yoW8tFWxpF Z3ua47Kw4rCr47GFs7Ka4Uu34fZF4rAw47Wr1vg34fAr9IyFyqvr4xtw4rZFW8CrWSqry3 Xr1q93W8XF4DAFJanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUU9Y14x267AKxVW5JVWrJwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26w1j6s0DM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26r4U JVWxJr1l84ACjcxK6I8E87Iv67AKxVW0oVCq3wA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_Gc CE3s1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E 2Ix0cI8IcVAFwI0_Jr0_Jr4lYx0Ex4A2jsIE14v26r1j6r4UMcvjeVCFs4IE7xkEbVWUJV W8JwACjcxG0xvY0x0EwIxGrwACjI8F5VA0II8E6IAqYI8I648v4I1lFIxGxcIEc7CjxVA2 Y2ka0xkIwI1lc7CjxVAaw2AFwI0_GFv_Wryl42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x 0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2 zVAF1VAY17CE14v26r4a6rW5MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF 4lIxAIcVC0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWU CwCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCT nIWIevJa73UjIFyTuYvjTRNJ5oDUUUU X-CM-SenderInfo: hfkh02xlgr0w46kxt4xhlfz01xgou0bp/ From: Chen Ridong The memcg LRU was introduced to improve scalability in global reclaim, but its implementation has grown complex and can cause performance regressions when creating many memory cgroups [1]. This series implements mem_cgroup_iter with a reclaim cookie in shrink_many() for global reclaim, following the pattern already used in shrink_node_memcgs(), an approach suggested by Johannes [1]. The new design maintains good fairness across cgroups by preserving iteration state between reclaim passes. Testing was performed using the original stress test from Yu Zhao [2] on a 1 TB, 4-node NUMA system. The results show: pgsteal: memcg LRU memcg iter stddev(pgsteal) / mean(pgsteal) 106.03% 93.20% sum(pgsteal) / sum(requested) 98.10% 99.28% workingset_refault_anon: memcg LRU memcg iter stddev(refault) / mean(refault) 193.97% 134.67% sum(refault) 1,963,229 2,027,567 The new implementation shows clear fairness improvements, reducing the standard deviation relative to the mean by 12.8 percentage points for pgsteal and bringing the pgsteal ratio closer to 100%. Refault counts increased by 3.2% (from 1,963,229 to 2,027,567). To simplify review: 1. Patch 1 uses mem_cgroup_iter with reclaim cookie in shrink_many() 2. Patch 2 removes the now-unused memcg LRU code 3. Patches 3–5 combine shrink_many and shrink_node_memcgs (This reorganization is clearer after switching to mem_cgroup_iter) --- Changes from RFC series: 1. Updated the test result data. 2. Added patches 3–5 to combine shrink_many and shrink_node_memcgs. RFC: https://lore.kernel.org/all/20251204123124.1822965-1-chenridong@huaweicloud.com/ Chen Ridong (5): mm/mglru: use mem_cgroup_iter for global reclaim mm/mglru: remove memcg lru mm/mglru: extend shrink_one for both lrugen and non-lrugen mm/mglru: combine shrink_many into shrink_node_memcgs mm/mglru: factor lrugen state out of shrink_lruvec Documentation/mm/multigen_lru.rst | 30 --- include/linux/mmzone.h | 89 -------- mm/memcontrol-v1.c | 6 - mm/memcontrol.c | 4 - mm/mm_init.c | 1 - mm/vmscan.c | 332 ++++-------------------------- 6 files changed, 44 insertions(+), 418 deletions(-) -- 2.34.1