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=-13.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,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 C027CC433E2 for ; Tue, 1 Sep 2020 01:47:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A9C682098B for ; Tue, 1 Sep 2020 01:47:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726762AbgIABrG (ORCPT ); Mon, 31 Aug 2020 21:47:06 -0400 Received: from out30-42.freemail.mail.aliyun.com ([115.124.30.42]:38560 "EHLO out30-42.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726023AbgIABqr (ORCPT ); Mon, 31 Aug 2020 21:46:47 -0400 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R201e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e01358;MF=richard.weiyang@linux.alibaba.com;NM=1;PH=DS;RN=6;SR=0;TI=SMTPD_---0U7UAs.E_1598924803; Received: from localhost(mailfrom:richard.weiyang@linux.alibaba.com fp:SMTPD_---0U7UAs.E_1598924803) by smtp.aliyun-inc.com(127.0.0.1); Tue, 01 Sep 2020 09:46:43 +0800 From: Wei Yang To: mike.kravetz@oracle.com, akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, bhe@redhat.com, Wei Yang Subject: [Patch v4 3/7] mm/hugetlb: use list_splice to merge two list at once Date: Tue, 1 Sep 2020 09:46:32 +0800 Message-Id: <20200901014636.29737-4-richard.weiyang@linux.alibaba.com> X-Mailer: git-send-email 2.20.1 (Apple Git-117) In-Reply-To: <20200901014636.29737-1-richard.weiyang@linux.alibaba.com> References: <20200901014636.29737-1-richard.weiyang@linux.alibaba.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Instead of add allocated file_region one by one to region_cache, we could use list_splice to merge two list at once. Also we know the number of entries in the list, increase the number directly. Signed-off-by: Wei Yang Reviewed-by: Baoquan He Reviewed-by: Mike Kravetz --- mm/hugetlb.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index fbaf49bc1d26..a02bf430de6f 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -443,11 +443,8 @@ static int allocate_file_region_entries(struct resv_map *resv, spin_lock(&resv->lock); - list_for_each_entry_safe(rg, trg, &allocated_regions, link) { - list_del(&rg->link); - list_add(&rg->link, &resv->region_cache); - resv->region_cache_count++; - } + list_splice(&allocated_regions, &resv->region_cache); + resv->region_cache_count += to_allocate; } return 0; -- 2.20.1 (Apple Git-117)