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,URIBL_BLOCKED,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 38BB4C17440 for ; Tue, 12 Nov 2019 14:06:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1424F206B6 for ; Tue, 12 Nov 2019 14:06:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727461AbfKLOGs (ORCPT ); Tue, 12 Nov 2019 09:06:48 -0500 Received: from out30-130.freemail.mail.aliyun.com ([115.124.30.130]:34843 "EHLO out30-130.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727312AbfKLOGs (ORCPT ); Tue, 12 Nov 2019 09:06:48 -0500 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R511e4;CH=green;DM=||false|;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01f04391;MF=alex.shi@linux.alibaba.com;NM=1;PH=DS;RN=18;SR=0;TI=SMTPD_---0Thubemo_1573567601; Received: from localhost(mailfrom:alex.shi@linux.alibaba.com fp:SMTPD_---0Thubemo_1573567601) by smtp.aliyun-inc.com(127.0.0.1); Tue, 12 Nov 2019 22:06:41 +0800 From: Alex Shi To: alex.shi@linux.alibaba.com, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.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 Cc: Johannes Weiner , Michal Hocko , Vladimir Davydov , Roman Gushchin , Shakeel Butt , Chris Down , Thomas Gleixner Subject: [PATCH v2 7/8] mm/lru: likely enhancement Date: Tue, 12 Nov 2019 22:06:27 +0800 Message-Id: <1573567588-47048-8-git-send-email-alex.shi@linux.alibaba.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1573567588-47048-1-git-send-email-alex.shi@linux.alibaba.com> References: <1573567588-47048-1-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 Use likely() to remove speculations according to pagevec usage mode. Signed-off-by: Alex Shi Cc: Johannes Weiner Cc: Michal Hocko Cc: Vladimir Davydov Cc: Andrew Morton Cc: Roman Gushchin Cc: Shakeel Butt Cc: Chris Down Cc: Tejun Heo Cc: Thomas Gleixner Cc: linux-kernel@vger.kernel.org Cc: cgroups@vger.kernel.org Cc: linux-mm@kvack.org --- include/linux/memcontrol.h | 8 ++++---- mm/memcontrol.c | 4 ++-- 2 files changed, 6 insertions(+), 6 deletions(-) diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index f869897a68f0..2a6d7a503452 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -1307,12 +1307,12 @@ static inline struct lruvec *relock_page_lruvec_irq(struct page *page, struct pglist_data *pgdat = page_pgdat(page); struct lruvec *lruvec; - if (!locked_lruvec) + if (unlikely(!locked_lruvec)) goto lock; lruvec = mem_cgroup_page_lruvec(page, pgdat); - if (locked_lruvec == lruvec) + if (likely(locked_lruvec == lruvec)) return lruvec; spin_unlock_irq(&locked_lruvec->lru_lock); @@ -1329,12 +1329,12 @@ static inline struct lruvec *relock_page_lruvec_irqsave(struct page *page, struct pglist_data *pgdat = page_pgdat(page); struct lruvec *lruvec; - if (!locked_lruvec) + if (unlikely(!locked_lruvec)) goto lock; lruvec = mem_cgroup_page_lruvec(page, pgdat); - if (locked_lruvec == lruvec) + if (likely(locked_lruvec == lruvec)) return lruvec; spin_unlock_irqrestore(&locked_lruvec->lru_lock, locked_lruvec->flags); diff --git a/mm/memcontrol.c b/mm/memcontrol.c index d2539bac4677..d95adf49fae3 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -1273,7 +1273,7 @@ struct lruvec *lock_page_lruvec_irq(struct page *page, spin_lock_irq(&lruvec->lru_lock); /* lruvec may changed in commit_charge() */ - if (lruvec != mem_cgroup_page_lruvec(page, pgdat)) { + if (unlikely(lruvec != mem_cgroup_page_lruvec(page, pgdat))) { spin_unlock_irq(&lruvec->lru_lock); goto again; } @@ -1291,7 +1291,7 @@ struct lruvec *lock_page_lruvec_irqsave(struct page *page, spin_lock_irqsave(&lruvec->lru_lock, lruvec->flags); /* lruvec may changed in commit_charge() */ - if (lruvec != mem_cgroup_page_lruvec(page, pgdat)) { + if (unlikely(lruvec != mem_cgroup_page_lruvec(page, pgdat))) { spin_unlock_irqrestore(&lruvec->lru_lock, lruvec->flags); goto again; } -- 1.8.3.1