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=-6.1 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,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 3F01DC433E6 for ; Fri, 28 Aug 2020 05:24:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 23CF420791 for ; Fri, 28 Aug 2020 05:24:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726900AbgH1FYV (ORCPT ); Fri, 28 Aug 2020 01:24:21 -0400 Received: from out30-54.freemail.mail.aliyun.com ([115.124.30.54]:53915 "EHLO out30-54.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725849AbgH1FYV (ORCPT ); Fri, 28 Aug 2020 01:24:21 -0400 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R191e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e07488;MF=alex.shi@linux.alibaba.com;NM=1;PH=DS;RN=21;SR=0;TI=SMTPD_---0U7448ER_1598592253; Received: from IT-FVFX43SYHV2H.local(mailfrom:alex.shi@linux.alibaba.com fp:SMTPD_---0U7448ER_1598592253) by smtp.aliyun-inc.com(127.0.0.1); Fri, 28 Aug 2020 13:24:14 +0800 Subject: Re: [PATCH v18 00/32] per memcg lru_lock To: Daniel Jordan Cc: Hugh Dickins , Andrew Morton , mgorman@techsingularity.net, tj@kernel.org, khlebnikov@yandex-team.ru, willy@infradead.org, hannes@cmpxchg.org, lkp@intel.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, shakeelb@google.com, iamjoonsoo.kim@lge.com, richard.weiyang@gmail.com, kirill@shutemov.name, alexander.duyck@gmail.com, rong.a.chen@intel.com, mhocko@suse.com, vdavydov.dev@gmail.com, shy828301@gmail.com References: <1598273705-69124-1-git-send-email-alex.shi@linux.alibaba.com> <20200824114204.cc796ca182db95809dd70a47@linux-foundation.org> <20200825015627.3c3pnwauqznnp3gc@ca-dmjordan1.us.oracle.com> <20200826011946.spknwjt44d2szrdo@ca-dmjordan1.us.oracle.com> <01ed6e45-3853-dcba-61cb-b429a49a7572@linux.alibaba.com> <20200828014022.y5xju6weysqpzxd2@ca-dmjordan1.us.oracle.com> From: Alex Shi Message-ID: <327a1bb4-b64d-65b8-e18f-db33e03ca9ed@linux.alibaba.com> Date: Fri, 28 Aug 2020 13:22:28 +0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <20200828014022.y5xju6weysqpzxd2@ca-dmjordan1.us.oracle.com> Content-Type: text/plain; charset=gbk Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ÔÚ 2020/8/28 ÉÏÎç9:40, Daniel Jordan дµÀ: > I went back to your v1 post to see what motivated you originally, and you had > some results from aim9 but nothing about where this reared its head in the > first place. How did you discover the bottleneck? I'm just curious about how > lru_lock hurts in practice. We have gotten very high 'sys' in some buiness/machines. And found much of time spent on the lru_lock and/or zone lock. Seems per memcg lru_lock could help this, but still no idea on zone lock. Thanks Alex