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=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY,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 0D62EC3F2D7 for ; Mon, 2 Mar 2020 11:01:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E40212166E for ; Mon, 2 Mar 2020 11:01:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727770AbgCBLBR (ORCPT ); Mon, 2 Mar 2020 06:01:17 -0500 Received: from out4436.biz.mail.alibaba.com ([47.88.44.36]:65157 "EHLO out4436.biz.mail.alibaba.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727736AbgCBLBN (ORCPT ); Mon, 2 Mar 2020 06:01:13 -0500 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R141e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e07417;MF=alex.shi@linux.alibaba.com;NM=1;PH=DS;RN=16;SR=0;TI=SMTPD_---0TrRgpkq_1583146859; Received: from localhost(mailfrom:alex.shi@linux.alibaba.com fp:SMTPD_---0TrRgpkq_1583146859) by smtp.aliyun-inc.com(127.0.0.1); Mon, 02 Mar 2020 19:01:00 +0800 From: Alex Shi To: cgroups@vger.kernel.org, akpm@linux-foundation.org, mgorman@techsingularity.net, tj@kernel.org, hughd@google.com, khlebnikov@yandex-team.ru, daniel.m.jordan@oracle.com, yang.shi@linux.alibaba.com, willy@infradead.org, hannes@cmpxchg.org, lkp@intel.com Cc: Alex Shi , Thomas Gleixner , Andrey Ryabinin , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v9 14/20] mm/lru: introduce the relock_page_lruvec function Date: Mon, 2 Mar 2020 19:00:24 +0800 Message-Id: <1583146830-169516-15-git-send-email-alex.shi@linux.alibaba.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1583146830-169516-1-git-send-email-alex.shi@linux.alibaba.com> References: <1583146830-169516-1-git-send-email-alex.shi@linux.alibaba.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org During the lruvec locking, a new page's lruvec is may same as previous one. Thus we could save a re-locking, and only change lock iff lruvec is new. Function named relock_page_lruvec following Hugh Dickins' patch. Signed-off-by: Alex Shi Cc: Johannes Weiner Cc: Andrew Morton Cc: Thomas Gleixner Cc: Andrey Ryabinin Cc: Matthew Wilcox Cc: Mel Gorman Cc: Konstantin Khlebnikov Cc: Hugh Dickins Cc: Tejun Heo Cc: linux-kernel@vger.kernel.org Cc: cgroups@vger.kernel.org Cc: linux-mm@kvack.org --- include/linux/memcontrol.h | 36 ++++++++++++++++++++++++++++++++++++ mm/vmscan.c | 8 ++------ 2 files changed, 38 insertions(+), 6 deletions(-) diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index b8a04f0a2ab8..f60009580d2a 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -1307,6 +1307,42 @@ static inline void dec_lruvec_page_state(struct page *page, mod_lruvec_page_state(page, idx, -1); } +/* Don't lock again iff page's lruvec locked */ +static inline struct lruvec *relock_page_lruvec_irq(struct page *page, + struct lruvec *locked_lruvec) +{ + struct pglist_data *pgdat = page_pgdat(page); + struct lruvec *lruvec; + + lruvec = mem_cgroup_page_lruvec(page, pgdat); + + if (likely(locked_lruvec == lruvec)) + return lruvec; + + if (unlikely(locked_lruvec)) + unlock_page_lruvec_irq(locked_lruvec); + + return lock_page_lruvec_irq(page); +} + +/* Don't lock again iff page's lruvec locked */ +static inline struct lruvec *relock_page_lruvec_irqsave(struct page *page, + struct lruvec *locked_lruvec, unsigned long *flags) +{ + struct pglist_data *pgdat = page_pgdat(page); + struct lruvec *lruvec; + + lruvec = mem_cgroup_page_lruvec(page, pgdat); + + if (likely(locked_lruvec == lruvec)) + return lruvec; + + if (unlikely(locked_lruvec)) + unlock_page_lruvec_irqrestore(locked_lruvec, *flags); + + return lock_page_lruvec_irqsave(page, flags); +} + #ifdef CONFIG_CGROUP_WRITEBACK struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb); diff --git a/mm/vmscan.c b/mm/vmscan.c index a58cd5ee9ea1..de925bd629eb 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -4325,14 +4325,10 @@ void check_move_unevictable_pages(struct pagevec *pvec) for (i = 0; i < pvec->nr; i++) { struct page *page = pvec->pages[i]; - struct lruvec *new_lruvec = mem_cgroup_page_lruvec(page, page_pgdat(page)); pgscanned++; - if (lruvec != new_lruvec) { - if (lruvec) - unlock_page_lruvec_irq(lruvec); - lruvec = lock_page_lruvec_irq(page); - } + + lruvec = relock_page_lruvec_irq(page, lruvec); if (!TestClearPageLRU(page) || !PageUnevictable(page)) continue; -- 1.8.3.1