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[2620:137:e000::1:20]) by mx.google.com with ESMTP id n5-20020a17090ac68500b0022bece36192si9549146pjt.81.2023.01.28.19.03.45; Sat, 28 Jan 2023 19:03:57 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=huawei.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230012AbjA2CzO (ORCPT + 99 others); Sat, 28 Jan 2023 21:55:14 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36300 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229637AbjA2CzN (ORCPT ); Sat, 28 Jan 2023 21:55:13 -0500 Received: from szxga03-in.huawei.com (szxga03-in.huawei.com [45.249.212.189]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E6D591C58E for ; Sat, 28 Jan 2023 18:55:11 -0800 (PST) Received: from dggpemm500002.china.huawei.com (unknown [172.30.72.54]) by szxga03-in.huawei.com (SkyGuard) with ESMTP id 4P4G5b31CnzJqMP; Sun, 29 Jan 2023 10:50:43 +0800 (CST) Received: from localhost.localdomain (10.175.112.125) by dggpemm500002.china.huawei.com (7.185.36.229) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.34; Sun, 29 Jan 2023 10:55:09 +0800 From: Chen Wandun To: , , , CC: Subject: [PATCH] mm/migrate: Continue to migrate for small pages Date: Sun, 29 Jan 2023 10:54:04 +0800 Message-ID: <20230129025404.1262745-1-chenwandun@huawei.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Originating-IP: [10.175.112.125] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To dggpemm500002.china.huawei.com (7.185.36.229) X-CFilter-Loop: Reflected X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_MED, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1756324364575535142?= X-GMAIL-MSGID: =?utf-8?q?1756324364575535142?= migrate_hugetlbs returns -ENOMEM when no enough huge page, however maybe there are still free small pages, so continue to migrate for small pages. Signed-off-by: Chen Wandun --- mm/migrate.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/mm/migrate.c b/mm/migrate.c index b971edbf32fc..c9d0d2058036 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1939,7 +1939,12 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page, rc_gather = migrate_hugetlbs(from, get_new_page, put_new_page, private, mode, reason, &stats, &ret_folios); - if (rc_gather < 0) + /* Maybe there are free small pages, continue to migrate. + * Nowdays the only negtive return value of migrate_hugetlbs + * is -ENOMEM, keep compatible for coming negtive return + * value instead of ignore return value. + */ + if (rc_gather < 0 && rc_gather != -ENOMEM) goto out; again: nr_pages = 0;