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 11725C433E0 for ; Fri, 7 Aug 2020 09:13:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E504921744 for ; Fri, 7 Aug 2020 09:13:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728043AbgHGJN1 (ORCPT ); Fri, 7 Aug 2020 05:13:27 -0400 Received: from out30-54.freemail.mail.aliyun.com ([115.124.30.54]:44575 "EHLO out30-54.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727855AbgHGJNX (ORCPT ); Fri, 7 Aug 2020 05:13:23 -0400 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R311e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e07488;MF=richard.weiyang@linux.alibaba.com;NM=1;PH=DS;RN=5;SR=0;TI=SMTPD_---0U5.6f7D_1596791599; Received: from localhost(mailfrom:richard.weiyang@linux.alibaba.com fp:SMTPD_---0U5.6f7D_1596791599) by smtp.aliyun-inc.com(127.0.0.1); Fri, 07 Aug 2020 17:13:20 +0800 From: Wei Yang To: mike.kravetz@oracle.com, akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Wei Yang Subject: [PATCH 08/10] mm/hugetlb: return non-isolated page in the loop instead of break and check Date: Fri, 7 Aug 2020 17:12:49 +0800 Message-Id: <20200807091251.12129-9-richard.weiyang@linux.alibaba.com> X-Mailer: git-send-email 2.20.1 (Apple Git-117) In-Reply-To: <20200807091251.12129-1-richard.weiyang@linux.alibaba.com> References: <20200807091251.12129-1-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 Function dequeue_huge_page_node_exact() iterates the free list and return the first non-isolated one. Instead of break and check the loop variant, we could return in the loop directly. This could reduce some redundant check. Signed-off-by: Wei Yang --- mm/hugetlb.c | 26 ++++++++++++-------------- 1 file changed, 12 insertions(+), 14 deletions(-) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index b8e844911b5a..9473eb6800e9 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1035,20 +1035,18 @@ static struct page *dequeue_huge_page_node_exact(struct hstate *h, int nid) { struct page *page; - list_for_each_entry(page, &h->hugepage_freelists[nid], lru) - if (!PageHWPoison(page)) - break; - /* - * if 'non-isolated free hugepage' not found on the list, - * the allocation fails. - */ - if (&h->hugepage_freelists[nid] == &page->lru) - return NULL; - list_move(&page->lru, &h->hugepage_activelist); - set_page_refcounted(page); - h->free_huge_pages--; - h->free_huge_pages_node[nid]--; - return page; + list_for_each_entry(page, &h->hugepage_freelists[nid], lru) { + if (PageHWPoison(page)) + continue; + + list_move(&page->lru, &h->hugepage_activelist); + set_page_refcounted(page); + h->free_huge_pages--; + h->free_huge_pages_node[nid]--; + return page; + } + + return NULL; } static struct page *dequeue_huge_page_nodemask(struct hstate *h, gfp_t gfp_mask, int nid, -- 2.20.1 (Apple Git-117)