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=-15.8 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 A7485C2D0E4 for ; Fri, 18 Dec 2020 22:02:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6295F23B87 for ; Fri, 18 Dec 2020 22:02:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725862AbgLRWCJ (ORCPT ); Fri, 18 Dec 2020 17:02:09 -0500 Received: from mail.kernel.org ([198.145.29.99]:35560 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725855AbgLRWCJ (ORCPT ); Fri, 18 Dec 2020 17:02:09 -0500 Date: Fri, 18 Dec 2020 14:01:28 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1608328889; bh=S+FtJ3ySdURLoRj1IigrxxOmVpvlhvou+RKM3lV6+W4=; h=From:To:Subject:In-Reply-To:From; b=bw9iNG+SVxnG7z0/MrvumB8tDTID7IKTXTo5a1Wpw1AmTVf+rh8CTUGA6XQ4Hbou9 wokr98ieiaUoUAW805cAD5kOupvrio/vwk1TpaNWiQMmvOxUQIcS7M7yH0YbAc4tFN pIaYaxYNpneCMffm96ZpsTYoKIZLGC5zqmIw0tGo= From: Andrew Morton To: akpm@linux-foundation.org, alex.shi@linux.alibaba.com, guro@fb.com, hannes@cmpxchg.org, hughd@google.com, linux-mm@kvack.org, mhocko@suse.com, mm-commits@vger.kernel.org, torvalds@linux-foundation.org, vdavydov.dev@gmail.com Subject: [patch 01/78] mm/memcg: bail early from swap accounting if memcg disabled Message-ID: <20201218220128.vmNwvyXdi%akpm@linux-foundation.org> In-Reply-To: <20201218140046.497484741326828e5b5d46ec@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: bail early from swap accounting if memcg disabled Patch series "bail out early for memcg disable". These 2 patches are indepenedent from per memcg lru lock, and may encounter unexpected warning, so let's move out them from per memcg lru locking patchset. This patch (of 2): We could bail out early when memcg wasn't enabled. Link: https://lkml.kernel.org/r/1604283436-18880-1-git-send-email-alex.shi@linux.alibaba.com Link: https://lkml.kernel.org/r/1604283436-18880-2-git-send-email-alex.shi@linux.alibaba.com Signed-off-by: Alex Shi Reviewed-by: Roman Gushchin Acked-by: Michal Hocko Acked-by: Hugh Dickins Acked-by: Johannes Weiner Cc: Vladimir Davydov Signed-off-by: Andrew Morton --- mm/memcontrol.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/mm/memcontrol.c~mm-memcg-bail-early-from-swap-accounting-if-memcg-disabled +++ a/mm/memcontrol.c @@ -7178,6 +7178,9 @@ void mem_cgroup_swapout(struct page *pag VM_BUG_ON_PAGE(PageLRU(page), page); VM_BUG_ON_PAGE(page_count(page), page); + if (mem_cgroup_disabled()) + return; + if (cgroup_subsys_on_dfl(memory_cgrp_subsys)) return; @@ -7242,6 +7245,9 @@ int mem_cgroup_try_charge_swap(struct pa struct mem_cgroup *memcg; unsigned short oldid; + if (mem_cgroup_disabled()) + return 0; + if (!cgroup_subsys_on_dfl(memory_cgrp_subsys)) return 0; _