From patchwork Tue Mar 29 13:26:15 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miaohe Lin X-Patchwork-Id: 12794840 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9FD8FC433EF for ; Tue, 29 Mar 2022 13:25:53 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 14A9D8D0005; Tue, 29 Mar 2022 09:25:50 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 0E7AC8D0002; Tue, 29 Mar 2022 09:25:49 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B292F8D0006; Tue, 29 Mar 2022 09:25:49 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0087.hostedemail.com [216.40.44.87]) by kanga.kvack.org (Postfix) with ESMTP id 99F008D0001 for ; Tue, 29 Mar 2022 09:25:49 -0400 (EDT) Received: from smtpin18.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 4285BA4DC5 for ; Tue, 29 Mar 2022 13:25:49 +0000 (UTC) X-FDA: 79297496418.18.0F55F31 Received: from szxga08-in.huawei.com (szxga08-in.huawei.com [45.249.212.255]) by imf05.hostedemail.com (Postfix) with ESMTP id 7BB6F10003D for ; Tue, 29 Mar 2022 13:25:48 +0000 (UTC) Received: from canpemm500002.china.huawei.com (unknown [172.30.72.53]) by szxga08-in.huawei.com (SkyGuard) with ESMTP id 4KSVgF4BNMz1GD0v; Tue, 29 Mar 2022 21:25:29 +0800 (CST) Received: from huawei.com (10.175.124.27) by canpemm500002.china.huawei.com (7.192.104.244) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.21; Tue, 29 Mar 2022 21:25:45 +0800 From: Miaohe Lin To: CC: , , Subject: [PATCH 4/8] mm/vmscan: save a bit of stack space in shrink_lruvec Date: Tue, 29 Mar 2022 21:26:15 +0800 Message-ID: <20220329132619.18689-5-linmiaohe@huawei.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20220329132619.18689-1-linmiaohe@huawei.com> References: <20220329132619.18689-1-linmiaohe@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.124.27] X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To canpemm500002.china.huawei.com (7.192.104.244) X-CFilter-Loop: Reflected X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 7BB6F10003D X-Stat-Signature: tiwytj453yktcrw4if9npq86zr8dck43 X-Rspam-User: Authentication-Results: imf05.hostedemail.com; dkim=none; dmarc=pass (policy=quarantine) header.from=huawei.com; spf=pass (imf05.hostedemail.com: domain of linmiaohe@huawei.com designates 45.249.212.255 as permitted sender) smtp.mailfrom=linmiaohe@huawei.com X-HE-Tag: 1648560348-846661 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: LRU_UNEVICTABLE is not taken into account when shrink lruvec. So we can save a bit of stack space by shrinking the array size of nr and targets to NR_LRU_LISTS - 1. No functional change intended. Signed-off-by: Miaohe Lin --- mm/vmscan.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index a6e60c78d058..ebd8ffb63673 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2862,8 +2862,9 @@ static bool can_age_anon_pages(struct pglist_data *pgdat, static void shrink_lruvec(struct lruvec *lruvec, struct scan_control *sc) { - unsigned long nr[NR_LRU_LISTS]; - unsigned long targets[NR_LRU_LISTS]; + /* LRU_UNEVICTABLE is not taken into account. */ + unsigned long nr[NR_LRU_LISTS - 1]; + unsigned long targets[NR_LRU_LISTS - 1]; unsigned long nr_to_scan; enum lru_list lru; unsigned long nr_reclaimed = 0;