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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A188AC433FE for ; Wed, 29 Dec 2021 03:21:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238505AbhL2DVw (ORCPT ); Tue, 28 Dec 2021 22:21:52 -0500 Received: from szxga02-in.huawei.com ([45.249.212.188]:17310 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238492AbhL2DVv (ORCPT ); Tue, 28 Dec 2021 22:21:51 -0500 Received: from dggpemm500022.china.huawei.com (unknown [172.30.72.53]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4JNxW93HPSz91cp; Wed, 29 Dec 2021 11:20:53 +0800 (CST) Received: from dggpemm500002.china.huawei.com (7.185.36.229) by dggpemm500022.china.huawei.com (7.185.36.162) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.20; Wed, 29 Dec 2021 11:21:49 +0800 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 15.1.2308.20; Wed, 29 Dec 2021 11:21:48 +0800 From: Chen Wandun To: , , , , CC: Subject: [PATCH] mm/page_isolation: unset migratetype directly for non Buddy page Date: Wed, 29 Dec 2021 11:36:49 +0800 Message-ID: <20211229033649.2760586-1-chenwandun@huawei.com> X-Mailer: git-send-email 2.18.0.huawei.25 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.175.112.125] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To dggpemm500002.china.huawei.com (7.185.36.229) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There is no need to try to move_freepages_block for pages that is not in buddy in function unset_migratetype_isolate, it can directly set migrate type. It will save a few cpu cycles for some situations such as cma and hugetlb when allocating continue pages, in these situation function alloc_contig_pages will be called. alloc_contig_pages __alloc_contig_migrate_range isolate_freepages_range ==> pages has been remove from buddy undo_isolate_page_range unset_migratetype_isolate ==> can directly set migratetype Fixes: 3c605096d315 ("mm/page_alloc: restrict max order of merging on isolated pageblock") Signed-off-by: Chen Wandun --- mm/page_isolation.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/page_isolation.c b/mm/page_isolation.c index f67c4c70f17f..6a0ddda6b3c5 100644 --- a/mm/page_isolation.c +++ b/mm/page_isolation.c @@ -115,7 +115,7 @@ static void unset_migratetype_isolate(struct page *page, unsigned migratetype) * onlining - just onlined memory won't immediately be considered for * allocation. */ - if (!isolated_page) { + if (!isolated_page && PageBuddy(page)) { nr_pages = move_freepages_block(zone, page, migratetype, NULL); __mod_zone_freepage_state(zone, nr_pages, migratetype); } -- 2.18.0.huawei.25