From nobody Thu Jan 30 23:15:23 2025 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 85C801D9A6E; Fri, 24 Jan 2025 07:46:12 +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=1737704774; cv=none; b=Jb0pTgJLSvn7bT8nsAI5d8OhisdTZOO1N8dimTj+V+V/flMokcWDTxETjiMmSINFnL4hMRZ6bjbxj4kSabJCdbcnKgruiDvoFOJZgSpaRat74Ug7WxkFVbGb30Ox71Qr5PAyl3pqqWdLDBhSqL/MuKVM30avbKfRvSHkmgsH/XA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737704774; c=relaxed/simple; bh=/n8xGYAV0lo3e3m/M1f+T71ATzlfER8hP+5EADjB3kg=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ugc7FVejeLfw3VnOxNxxAtHW6wIjh9B2TM4Cd7llhHCIl4Zhd9YlgxM5Be2ZRg7fEp5Na0ozpp6wbUcq7eueYiYcPRlb3WQY4ADY+6QPJfLDSEzW2OaC5+soWX6FU1VYO1Oz7pa24jKRxGNpDZo/RfepuLXRceyS68HpWCkIQIg= 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 [172.19.163.235]) by dggsgout12.his.huawei.com (SkyGuard) with ESMTP id 4YfVH04DJHz4f3jdc; Fri, 24 Jan 2025 15:45:48 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.112]) by mail.maildlp.com (Postfix) with ESMTP id 4819E1A1020; Fri, 24 Jan 2025 15:46:09 +0800 (CST) Received: from hulk-vt.huawei.com (unknown [10.67.174.121]) by APP1 (Coremail) with SMTP id cCh0CgBHqnozRZNn89xFBw--.58969S5; Fri, 24 Jan 2025 15:46:09 +0800 (CST) From: Chen Ridong To: akpm@linux-foundation.org, mhocko@kernel.org, hannes@cmpxchg.org, yosryahmed@google.com, roman.gushchin@linux.dev, shakeel.butt@linux.dev, muchun.song@linux.dev, davidf@vimeo.com, vbabka@suse.cz, mkoutny@suse.com Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, chenridong@huawei.com, wangweiyang2@huawei.com Subject: [PATCH -v4 next 3/4] memcg: factor out the replace_stock_objcg function Date: Fri, 24 Jan 2025 07:35:13 +0000 Message-Id: <20250124073514.2375622-4-chenridong@huaweicloud.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250124073514.2375622-1-chenridong@huaweicloud.com> References: <20250124073514.2375622-1-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: cCh0CgBHqnozRZNn89xFBw--.58969S5 X-Coremail-Antispam: 1UD129KBjvJXoW7trykJFWUuF1fWryrKF4UJwb_yoW5JF1fpa 9rKas8Jr48AFW2gan8Ga17Zr1fXF4vvFnFkr4Iqw1xCFnIgFn0q342yFyjya4kJr93tF4x Jr4qyFsFkayUJ37anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUP2b4IE77IF4wAFF20E14v26rWj6s0DM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28IrcIa0xkI8VA2jI8067AKxVWUWw A2048vs2IY020Ec7CjxVAFwI0_Xr0E3s1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxS w2x7M28EF7xvwVC0I7IYx2IY67AKxVW7JVWDJwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxV W8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I0E14v2 6rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40Ex7xfMc Ij6xIIjxv20xvE14v26r106r15McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_ Jr0_Gr1lF7xvr2IYc2Ij64vIr41lFIxGxcIEc7CjxVA2Y2ka0xkIwI1lc7CjxVAaw2AFwI 0_Jw0_GFyl42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG 67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r1q6r43MI IYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E 14v26F4j6r4UJwCI42IY6xAIw20EY4v20xvaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Jr 0_Gr1lIxAIcVC2z280aVCY1x0267AKxVW8JVW8JrUvcSsGvfC2KfnxnUUI43ZEXa7IUbd- BtUUUUU== X-CM-SenderInfo: hfkh02xlgr0w46kxt4xhlfz01xgou0bp/ Content-Type: text/plain; charset="utf-8" From: Chen Ridong Factor out the 'replace_stock_objcg' function to make the code more cohesive. Signed-off-by: Chen Ridong Reviewed-by: Roman Gushchin Acked-by: Shakeel Butt Acked-by: Johannes Weiner --- mm/memcontrol.c | 26 ++++++++++++++++---------- 1 file changed, 16 insertions(+), 10 deletions(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 98f84a9fa228..b10e0a8f3375 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -2691,6 +2691,20 @@ void __memcg_kmem_uncharge_page(struct page *page, i= nt order) obj_cgroup_put(objcg); } =20 +/* Replace the stock objcg with objcg, return the old objcg */ +static struct obj_cgroup *replace_stock_objcg(struct memcg_stock_pcp *stoc= k, + struct obj_cgroup *objcg) +{ + struct obj_cgroup *old =3D NULL; + + old =3D drain_obj_stock(stock); + obj_cgroup_get(objcg); + stock->nr_bytes =3D atomic_read(&objcg->nr_charged_bytes) + ? atomic_xchg(&objcg->nr_charged_bytes, 0) : 0; + WRITE_ONCE(stock->cached_objcg, objcg); + return old; +} + static void mod_objcg_state(struct obj_cgroup *objcg, struct pglist_data *= pgdat, enum node_stat_item idx, int nr) { @@ -2708,11 +2722,7 @@ static void mod_objcg_state(struct obj_cgroup *objcg= , struct pglist_data *pgdat, * changes. */ if (READ_ONCE(stock->cached_objcg) !=3D objcg) { - old =3D drain_obj_stock(stock); - obj_cgroup_get(objcg); - stock->nr_bytes =3D atomic_read(&objcg->nr_charged_bytes) - ? atomic_xchg(&objcg->nr_charged_bytes, 0) : 0; - WRITE_ONCE(stock->cached_objcg, objcg); + old =3D replace_stock_objcg(stock, objcg); stock->cached_pgdat =3D pgdat; } else if (stock->cached_pgdat !=3D pgdat) { /* Flush the existing cached vmstat data */ @@ -2866,11 +2876,7 @@ static void refill_obj_stock(struct obj_cgroup *objc= g, unsigned int nr_bytes, =20 stock =3D this_cpu_ptr(&memcg_stock); if (READ_ONCE(stock->cached_objcg) !=3D objcg) { /* reset if necessary */ - old =3D drain_obj_stock(stock); - obj_cgroup_get(objcg); - WRITE_ONCE(stock->cached_objcg, objcg); - stock->nr_bytes =3D atomic_read(&objcg->nr_charged_bytes) - ? atomic_xchg(&objcg->nr_charged_bytes, 0) : 0; + old =3D replace_stock_objcg(stock, objcg); allow_uncharge =3D true; /* Allow uncharge when objcg changes */ } stock->nr_bytes +=3D nr_bytes; --=20 2.34.1