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 BABD2C433E7 for ; Tue, 1 Sep 2020 01:46:50 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 87FC320707 for ; Tue, 1 Sep 2020 01:46:50 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 87FC320707 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 1A8956B0037; Mon, 31 Aug 2020 21:46:50 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 159E38E0001; Mon, 31 Aug 2020 21:46:50 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id F16206B005A; Mon, 31 Aug 2020 21:46:49 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0069.hostedemail.com [216.40.44.69]) by kanga.kvack.org (Postfix) with ESMTP id CCD6C6B0037 for ; Mon, 31 Aug 2020 21:46:49 -0400 (EDT) Received: from smtpin28.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 839681F1B for ; Tue, 1 Sep 2020 01:46:49 +0000 (UTC) X-FDA: 77212803738.28.town16_5e11b5327094 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin28.hostedemail.com (Postfix) with ESMTP id 4FC786C04 for ; Tue, 1 Sep 2020 01:46:49 +0000 (UTC) X-HE-Tag: town16_5e11b5327094 X-Filterd-Recvd-Size: 2306 Received: from out30-56.freemail.mail.aliyun.com (out30-56.freemail.mail.aliyun.com [115.124.30.56]) by imf11.hostedemail.com (Postfix) with ESMTP for ; Tue, 1 Sep 2020 01:46:48 +0000 (UTC) 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 X-Rspamd-Queue-Id: 4FC786C04 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam05 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000071, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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, =20 spin_lock(&resv->lock); =20 - 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 +=3D to_allocate; } =20 return 0; --=20 2.20.1 (Apple Git-117)