From nobody Tue Feb 10 01:31:16 2026 Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) (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 3B7E3241663; Wed, 24 Dec 2025 07:45:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.51 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766562339; cv=none; b=rkBDcMYPopMDWKuUXc6EsBFELTYiBb8grru48155AWEg2zFeGaTmaC+f8Qz6f4nimbi288goo5mFKEibiL60VOKZSrOd2MAHhiQZ7JjxU0Vr/YgIP3Yc+pA3T9pNDsHT6t8IhSoACsuSJYYaxFtaW2QiZ7MlLRUB4LLgGGHqrCQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766562339; c=relaxed/simple; bh=af/sk98zsUM4g+eqRJUDh8CH/q9VRnBLA99zr4H3VD0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=PIwZXRekth0A7XvcMieMKj4Ey5YiMvtXNcQk4Z4tpxOToLrXgukC9a1Pa4GbiQ+KJ7na8hWkBmzJtqjJFvd2VLIzE0ooEmQkz1KR3rlAbg7sFE7ndjrftXV7MxVzgnx3jGwwMNe5KWtwOqeWsSW3xrJs6EGth1m9dlPOgLvy7cQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com; spf=none smtp.mailfrom=huaweicloud.com; arc=none smtp.client-ip=45.249.212.51 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=huaweicloud.com Received: from mail.maildlp.com (unknown [172.19.163.198]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTPS id 4dbkRr6RSkzYQtpR; Wed, 24 Dec 2025 15:44:56 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.128]) by mail.maildlp.com (Postfix) with ESMTP id 34B4C40576; Wed, 24 Dec 2025 15:45:35 +0800 (CST) Received: from hulk-vt.huawei.com (unknown [10.67.174.121]) by APP4 (Coremail) with SMTP id gCh0CgA3l_cMmktp9pcvBQ--.63051S7; Wed, 24 Dec 2025 15:45:34 +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, mkoutny@suse.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 Subject: [PATCH -next v2 5/7] mm/mglru: extend lru_gen_shrink_lruvec to support root reclaim Date: Wed, 24 Dec 2025 07:30:30 +0000 Message-Id: <20251224073032.161911-6-chenridong@huaweicloud.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20251224073032.161911-1-chenridong@huaweicloud.com> References: <20251224073032.161911-1-chenridong@huaweicloud.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: gCh0CgA3l_cMmktp9pcvBQ--.63051S7 X-Coremail-Antispam: 1UD129KBjvJXoWrKF4xKF1rJrWUWFWrWw4kJFb_yoW8Jr1rpa 9xG3yUZa4rAr4ag3Z3Xa1kWa4ruw48JF1xJrZrXry8AF4fXFy5K3y2kr4UCrW5Aw4kXrya qryYgryUW3WUZFJanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUmS14x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_JF0E3s1l82xGYI kIc2x26xkF7I0E14v26ryj6s0DM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8wA2 z4x0Y4vE2Ix0cI8IcVAFwI0_tr0E3s1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F 4UJwA2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x0267AKxVW0oVCq 3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7 IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r1j6r4U M4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIFxwACI402YVCY1x02628vn2 kIc2xKxwCY1x0262kKe7AKxVW8ZVWrXwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkE bVWUJVW8JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67 AF67kF1VAFwI0_GFv_WrylIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUCVW8JwCI 42IY6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F4UJwCI42IY6xAIw20EY4v20xvaj40_Jr0_JF 4lIxAIcVC2z280aVAFwI0_Jr0_Gr1lIxAIcVC2z280aVCY1x0267AKxVW8Jr0_Cr1UYxBI daVFxhVjvjDU0xZFpf9x0pRQJ5wUUUUU= X-CM-SenderInfo: hfkh02xlgr0w46kxt4xhlfz01xgou0bp/ Content-Type: text/plain; charset="utf-8" From: Chen Ridong The upcoming patch will integrate shrink_many and shrink_node_memcgs. Currently, lru_gen_shrink_lruvec only supports non-root reclaim invoked from shrink_node_memcgs. This patch extends it to also handle root reclaim. Since the initial setup for root reclaim is already completed in lru_gen_shrink_node, we can simply call try_to_shrink_lruvec within lru_gen_shrink_lruvec for root reclaim. Signed-off-by: Chen Ridong --- mm/vmscan.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index e55c7835cab5..3a266f6456af 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -4820,7 +4820,15 @@ static void lru_gen_shrink_lruvec(struct lruvec *lru= vec, struct scan_control *sc { struct blk_plug plug; =20 - VM_WARN_ON_ONCE(root_reclaim(sc)); + /* + * For root reclaim, the initial setup has already been completed externa= lly; + * proceed directly with the shrinking operation. + */ + if (root_reclaim(sc)) { + try_to_shrink_lruvec(lruvec, sc); + return; + } + VM_WARN_ON_ONCE(!sc->may_writepage || !sc->may_unmap); =20 lru_add_drain(); --=20 2.34.1