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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 66AAAC63777 for ; Fri, 20 Nov 2020 08:04:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0CBBA221FC for ; Fri, 20 Nov 2020 08:04:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726123AbgKTIDu (ORCPT ); Fri, 20 Nov 2020 03:03:50 -0500 Received: from out30-56.freemail.mail.aliyun.com ([115.124.30.56]:35879 "EHLO out30-56.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725766AbgKTIDu (ORCPT ); Fri, 20 Nov 2020 03:03:50 -0500 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R271e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04423;MF=alex.shi@linux.alibaba.com;NM=1;PH=DS;RN=7;SR=0;TI=SMTPD_---0UFyUd5s_1605859425; Received: from aliy80.localdomain(mailfrom:alex.shi@linux.alibaba.com fp:SMTPD_---0UFyUd5s_1605859425) by smtp.aliyun-inc.com(127.0.0.1); Fri, 20 Nov 2020 16:03:45 +0800 From: Alex Shi Cc: Andrew Morton , Hugh Dickins , Yu Zhao , Vlastimil Babka , Michal Hocko , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH next] mm/vmscan: __isolate_lru_page_prepare clean up Date: Fri, 20 Nov 2020 16:03:33 +0800 Message-Id: <1605859413-53864-1-git-send-email-alex.shi@linux.alibaba.com> X-Mailer: git-send-email 1.8.3.1 To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The function just return 2 results, so use a 'switch' to deal with its result is unnecessary, and simplify it to a bool func as Vlastimil suggested. Also removed 'goto' in using by reusing list_move(). Signed-off-by: Alex Shi Cc: Andrew Morton Cc: Hugh Dickins Cc: Yu Zhao Cc: Vlastimil Babka Cc: Michal Hocko Cc: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org --- mm/compaction.c | 2 +- mm/vmscan.c | 53 ++++++++++++++++++++++++------------------------- 2 files changed, 27 insertions(+), 28 deletions(-) diff --git a/mm/compaction.c b/mm/compaction.c index b68931854253..8d71ffebe6cb 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -988,7 +988,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn, if (unlikely(!get_page_unless_zero(page))) goto isolate_fail; - if (__isolate_lru_page_prepare(page, isolate_mode) != 0) + if (!__isolate_lru_page_prepare(page, isolate_mode)) goto isolate_fail_put; /* Try isolate the page */ diff --git a/mm/vmscan.c b/mm/vmscan.c index c6f94e55c3fe..7f32c1979804 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1540,7 +1540,7 @@ unsigned int reclaim_clean_pages_from_list(struct zone *zone, */ int __isolate_lru_page_prepare(struct page *page, isolate_mode_t mode) { - int ret = -EBUSY; + int ret = false; /* Only take pages on the LRU. */ if (!PageLRU(page)) @@ -1590,7 +1590,7 @@ int __isolate_lru_page_prepare(struct page *page, isolate_mode_t mode) if ((mode & ISOLATE_UNMAPPED) && page_mapped(page)) return ret; - return 0; + return true; } /* @@ -1674,35 +1674,34 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan, * only when the page is being freed somewhere else. */ scan += nr_pages; - switch (__isolate_lru_page_prepare(page, mode)) { - case 0: + if (!__isolate_lru_page_prepare(page, mode)) { + /* else it is being freed elsewhere */ + list_move(&page->lru, src); + continue; + } + /* + * Be careful not to clear PageLRU until after we're + * sure the page is not being freed elsewhere -- the + * page release code relies on it. + */ + if (unlikely(!get_page_unless_zero(page))) { + list_move(&page->lru, src); + continue; + } + + if (!TestClearPageLRU(page)) { /* - * Be careful not to clear PageLRU until after we're - * sure the page is not being freed elsewhere -- the - * page release code relies on it. + * This page may in other isolation path, + * but we still hold lru_lock. */ - if (unlikely(!get_page_unless_zero(page))) - goto busy; - - if (!TestClearPageLRU(page)) { - /* - * This page may in other isolation path, - * but we still hold lru_lock. - */ - put_page(page); - goto busy; - } - - nr_taken += nr_pages; - nr_zone_taken[page_zonenum(page)] += nr_pages; - list_move(&page->lru, dst); - break; - - default: -busy: - /* else it is being freed elsewhere */ + put_page(page); list_move(&page->lru, src); + continue; } + + nr_taken += nr_pages; + nr_zone_taken[page_zonenum(page)] += nr_pages; + list_move(&page->lru, dst); } /* -- 2.29.GIT