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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 3FC90C4332D for ; Wed, 24 Feb 2021 20:06:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E6E4364F26 for ; Wed, 24 Feb 2021 20:06:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235116AbhBXUGA (ORCPT ); Wed, 24 Feb 2021 15:06:00 -0500 Received: from mail.kernel.org ([198.145.29.99]:55904 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233576AbhBXUFO (ORCPT ); Wed, 24 Feb 2021 15:05:14 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 413C064F2E; Wed, 24 Feb 2021 20:03:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1614197032; bh=MdbD5dS61DyOcD0SHAgsXk29hGrzLzSJMLlZwZMUUbI=; h=Date:From:To:Subject:In-Reply-To:From; b=u8DxfA1fn/Q9EmdbwDmwTB7PY6D4XozEJPFqpiSPhHYRwOTvA8402z5zO3oJb3G9j KwYNg5cZ16SyMJALepmISOXxTQJOdoWLaH3ufMGbbD1iJOykMRTr//WZCOhDvScldu GAzjJF4iZQt+cyUn0AmvhrY3/v+y/dt4axlkymJg= Date: Wed, 24 Feb 2021 12:03:51 -0800 From: Andrew Morton To: akpm@linux-foundation.org, alex.shi@linux.alibaba.com, hannes@cmpxchg.org, hughd@google.com, linux-mm@kvack.org, mhocko@kernel.org, mm-commits@vger.kernel.org, torvalds@linux-foundation.org, vdavydov.dev@gmail.com Subject: [patch 065/173] mm/memcg: remove rcu locking for lock_page_lruvec function series Message-ID: <20210224200351.MIWbYvcmP%akpm@linux-foundation.org> In-Reply-To: <20210224115824.1e289a6895087f10c41dd8d6@linux-foundation.org> User-Agent: s-nail v14.8.16 Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org From: Alex Shi Subject: mm/memcg: remove rcu locking for lock_page_lruvec function series lock_page_lruvec() and its variants used rcu_read_lock() with the intention of safeguarding against the mem_cgroup being destroyed concurrently; but so long as they are called under the specified conditions (as they are), there is no way for the page's mem_cgroup to be destroyed. Delete the unnecessary rcu_read_lock() and _unlock(). Hugh Dickins polished the commit log. Thanks a lot! Link: https://lkml.kernel.org/r/1608614453-10739-2-git-send-email-alex.shi@linux.alibaba.com Signed-off-by: Alex Shi Acked-by: Hugh Dickins Cc: Hugh Dickins Cc: Johannes Weiner Cc: Michal Hocko Cc: Vladimir Davydov Signed-off-by: Andrew Morton --- mm/memcontrol.c | 6 ------ 1 file changed, 6 deletions(-) --- a/mm/memcontrol.c~mm-memcg-remove-rcu-locking-for-lock_page_lruvec-function-series +++ a/mm/memcontrol.c @@ -1357,10 +1357,8 @@ struct lruvec *lock_page_lruvec(struct p struct lruvec *lruvec; struct pglist_data *pgdat = page_pgdat(page); - rcu_read_lock(); lruvec = mem_cgroup_page_lruvec(page, pgdat); spin_lock(&lruvec->lru_lock); - rcu_read_unlock(); lruvec_memcg_debug(lruvec, page); @@ -1372,10 +1370,8 @@ struct lruvec *lock_page_lruvec_irq(stru struct lruvec *lruvec; struct pglist_data *pgdat = page_pgdat(page); - rcu_read_lock(); lruvec = mem_cgroup_page_lruvec(page, pgdat); spin_lock_irq(&lruvec->lru_lock); - rcu_read_unlock(); lruvec_memcg_debug(lruvec, page); @@ -1387,10 +1383,8 @@ struct lruvec *lock_page_lruvec_irqsave( struct lruvec *lruvec; struct pglist_data *pgdat = page_pgdat(page); - rcu_read_lock(); lruvec = mem_cgroup_page_lruvec(page, pgdat); spin_lock_irqsave(&lruvec->lru_lock, *flags); - rcu_read_unlock(); lruvec_memcg_debug(lruvec, page); _