From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 41619C4332E for ; Mon, 8 Mar 2021 11:29:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0F754651DE for ; Mon, 8 Mar 2021 11:29:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230412AbhCHL3Z (ORCPT ); Mon, 8 Mar 2021 06:29:25 -0500 Received: from szxga04-in.huawei.com ([45.249.212.190]:13143 "EHLO szxga04-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231184AbhCHL2t (ORCPT ); Mon, 8 Mar 2021 06:28:49 -0500 Received: from DGGEMS409-HUB.china.huawei.com (unknown [172.30.72.58]) by szxga04-in.huawei.com (SkyGuard) with ESMTP id 4DvGJj182xz16Hlh; Mon, 8 Mar 2021 19:27:01 +0800 (CST) Received: from huawei.com (10.175.104.175) by DGGEMS409-HUB.china.huawei.com (10.3.19.209) with Microsoft SMTP Server id 14.3.498.0; Mon, 8 Mar 2021 19:28:37 +0800 From: Miaohe Lin To: , CC: , , Subject: [PATCH 2/5] mm/hugetlb: optimize the surplus state transfer code in move_hugetlb_state() Date: Mon, 8 Mar 2021 06:28:06 -0500 Message-ID: <20210308112809.26107-3-linmiaohe@huawei.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20210308112809.26107-1-linmiaohe@huawei.com> References: <20210308112809.26107-1-linmiaohe@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [10.175.104.175] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We should not transfer the per-node surplus state when we do not cross the node in order to save some cpu cycles Reviewed-by: Mike Kravetz Signed-off-by: Miaohe Lin --- mm/hugetlb.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 33a3edf79022..695603071f2c 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -5621,6 +5621,12 @@ void move_hugetlb_state(struct page *oldpage, struct page *newpage, int reason) SetHPageTemporary(oldpage); ClearHPageTemporary(newpage); + /* + * There is no need to transfer the per-node surplus state + * when we do not cross the node. + */ + if (new_nid == old_nid) + return; spin_lock(&hugetlb_lock); if (h->surplus_huge_pages_node[old_nid]) { h->surplus_huge_pages_node[old_nid]--; -- 2.19.1