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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,USER_AGENT_SANE_1 autolearn=no 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 094EDC3A59F for ; Mon, 26 Aug 2019 14:17:35 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id CD34D20679 for ; Mon, 26 Aug 2019 14:17:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CD34D20679 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 8F4166B058D; Mon, 26 Aug 2019 10:17:33 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 87D646B058F; Mon, 26 Aug 2019 10:17:33 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 76BB56B0590; Mon, 26 Aug 2019 10:17:33 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0003.hostedemail.com [216.40.44.3]) by kanga.kvack.org (Postfix) with ESMTP id 579026B058D for ; Mon, 26 Aug 2019 10:17:33 -0400 (EDT) Received: from smtpin17.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with SMTP id EE8F8180AD7C3 for ; Mon, 26 Aug 2019 14:17:32 +0000 (UTC) X-FDA: 75864781944.17.lift23_78c532b3273e X-HE-Tag: lift23_78c532b3273e X-Filterd-Recvd-Size: 2197 Received: from out30-133.freemail.mail.aliyun.com (out30-133.freemail.mail.aliyun.com [115.124.30.133]) by imf45.hostedemail.com (Postfix) with ESMTP for ; Mon, 26 Aug 2019 14:17:31 +0000 (UTC) X-Alimail-AntiSpam:AC=PASS;BC=-1|-1;BR=01201311R131e4;CH=green;DM=||false|;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e07417;MF=alex.shi@linux.alibaba.com;NM=1;PH=DS;RN=11;SR=0;TI=SMTPD_---0TaX0VPG_1566829040; Received: from IT-FVFX43SYHV2H.local(mailfrom:alex.shi@linux.alibaba.com fp:SMTPD_---0TaX0VPG_1566829040) by smtp.aliyun-inc.com(127.0.0.1); Mon, 26 Aug 2019 22:17:23 +0800 Subject: Re: [PATCH 03/14] lru/memcg: using per lruvec lock in un/lock_page_lru To: Konstantin Khlebnikov , cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Andrew Morton , Mel Gorman , Tejun Heo Cc: Johannes Weiner , Michal Hocko , Vladimir Davydov , Hugh Dickins References: <1566294517-86418-1-git-send-email-alex.shi@linux.alibaba.com> <1566294517-86418-4-git-send-email-alex.shi@linux.alibaba.com> <936eb865-d8da-8e53-3e2b-6858c586aa49@yandex-team.ru> From: Alex Shi Message-ID: Date: Mon, 26 Aug 2019 22:16:58 +0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <936eb865-d8da-8e53-3e2b-6858c586aa49@yandex-team.ru> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: =E5=9C=A8 2019/8/26 =E4=B8=8B=E5=8D=884:30, Konstantin Khlebnikov =E5=86=99= =E9=81=93: >> >> =C2=A0=20 >=20 > What protects lruvec from freeing at this point? > After reading resolving lruvec page could be moved and cgroup deleted. >=20 > In this old patches I've used RCU for that: https://lkml.org/lkml/2012/= 2/20/276 > Pointer to lruvec should be resolved under disabled irq. > Not sure this works these days. Thanks for reminder! I will reconsider this point and come up with change= s. Thanks Alex