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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 80100C433B4 for ; Wed, 5 May 2021 01:33:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5D1B4613ED for ; Wed, 5 May 2021 01:33:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231925AbhEEBeW (ORCPT ); Tue, 4 May 2021 21:34:22 -0400 Received: from mail.kernel.org ([198.145.29.99]:37358 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231946AbhEEBeV (ORCPT ); Tue, 4 May 2021 21:34:21 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 32299613E4; Wed, 5 May 2021 01:33:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1620178406; bh=/i94y+3hsPdMo6xjlXydn6ETFi7WIrtficcFkt5hXrw=; h=Date:From:To:Subject:In-Reply-To:From; b=SNtbIkRoaBcDrw+EcX8JBCw3/9vVH9wFEONlhvTSiSPtscXgdLPoptmArT37wRnI6 oPGcJkk0t+h3vlPXN15EGGg0c4Sti/StfSetlgDMgJdDJjeOWC9msm2k320YlS856b 5Nxx8Dl99ZmXZHW+buMN6+QPK7uxzSiWM1R/U6Rw= Date: Tue, 04 May 2021 18:33:25 -0700 From: Andrew Morton To: akpm@linux-foundation.org, linmiaohe@huawei.com, linux-mm@kvack.org, mike.kravetz@oracle.com, mm-commits@vger.kernel.org, torvalds@linux-foundation.org Subject: [patch 013/143] mm/hugetlb: optimize the surplus state transfer code in move_hugetlb_state() Message-ID: <20210505013325.OwtWLcj5V%akpm@linux-foundation.org> In-Reply-To: <20210504183219.a3cc46aee4013d77402276c5@linux-foundation.org> User-Agent: s-nail v14.8.16 Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org From: Miaohe Lin Subject: mm/hugetlb: optimize the surplus state transfer code in move_hugetlb_state() We should not transfer the per-node surplus state when we do not cross the node in order to save some cpu cycles Link: https://lkml.kernel.org/r/20210308112809.26107-3-linmiaohe@huawei.com Signed-off-by: Miaohe Lin Reviewed-by: Mike Kravetz Signed-off-by: Andrew Morton --- mm/hugetlb.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/mm/hugetlb.c~mm-hugetlb-optimize-the-surplus-state-transfer-code-in-move_hugetlb_state +++ a/mm/hugetlb.c @@ -5682,6 +5682,12 @@ void move_hugetlb_state(struct page *old 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]--; _