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 AFD2BC433ED for ; Wed, 5 May 2021 01:33:33 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 5AEB5613E4 for ; Wed, 5 May 2021 01:33:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5AEB5613E4 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id E92A78D0015; Tue, 4 May 2021 21:33:32 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E1A6F8D0003; Tue, 4 May 2021 21:33:32 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CE2608D0015; Tue, 4 May 2021 21:33:32 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0196.hostedemail.com [216.40.44.196]) by kanga.kvack.org (Postfix) with ESMTP id B29F88D0003 for ; Tue, 4 May 2021 21:33:32 -0400 (EDT) Received: from smtpin15.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 6B60C181AF5C3 for ; Wed, 5 May 2021 01:33:32 +0000 (UTC) X-FDA: 78105455064.15.EEBAB5D Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf15.hostedemail.com (Postfix) with ESMTP id 658CAA0002C9 for ; Wed, 5 May 2021 01:33:26 +0000 (UTC) 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 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 658CAA0002C9 X-Stat-Signature: qeo8pe417u3suofj68ezcu5e1pt6iq5j Authentication-Results: imf15.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=SNtbIkRo; spf=pass (imf15.hostedemail.com: domain of akpm@linux-foundation.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org; dmarc=none Received-SPF: none (linux-foundation.org>: No applicable sender policy available) receiver=imf15; identity=mailfrom; envelope-from=""; helo=mail.kernel.org; client-ip=198.145.29.99 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1620178406-702731 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: 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]--; _