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=-0.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 D5C7FC54FD0 for ; Mon, 27 Apr 2020 17:13:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A24782078C for ; Mon, 27 Apr 2020 17:13:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=cmpxchg-org.20150623.gappssmtp.com header.i=@cmpxchg-org.20150623.gappssmtp.com header.b="YX8ypOO5" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726458AbgD0RNQ (ORCPT ); Mon, 27 Apr 2020 13:13:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59888 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726274AbgD0RNQ (ORCPT ); Mon, 27 Apr 2020 13:13:16 -0400 Received: from mail-qt1-x843.google.com (mail-qt1-x843.google.com [IPv6:2607:f8b0:4864:20::843]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1B817C0610D5 for ; Mon, 27 Apr 2020 10:13:16 -0700 (PDT) Received: by mail-qt1-x843.google.com with SMTP id z90so14871833qtd.10 for ; Mon, 27 Apr 2020 10:13:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cmpxchg-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:content-transfer-encoding:in-reply-to; bh=gq/hVuTwOmQSMneMygkOLzC97YbR5RTxhmWsHHCtD2U=; b=YX8ypOO5b3tqqWT49nZ/opdp0TWXhSm4SpC9rLf3j2MuHZVTVu9xpLe/99HQIdUHVr +MFb16vHQE26XQKzi/a5aJfpBDkiG1X5aUcKedCgu6D/P/XhHUyijIVppLxLc6owMgnf cV7xqZcYntn+8iNsFBDtMCcE10OkYNEYcUJGECO7UzgY54qfKODT5wLfRyvq7hnYcQHL Sk6Srv+koNou2ywjtFQyPVANIj3QNBhgftnawQ7doap3zL7+6OVhNd1cJ1tLrFGEDP+0 Nqlp8ZsKOChhhmdP8KLTWIQUgp+Z/kEkcnqfJgiY0AItXA50NYRbNE+tcQEX9UHFdETd 5nSw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to; bh=gq/hVuTwOmQSMneMygkOLzC97YbR5RTxhmWsHHCtD2U=; b=kgEjXJuIR4BNAlwG4uf7IAQE8TxUWMPj1HnXNqJNlH3EL1OtBvET4UGH+dXhNNuXLu o2G/k5OtQYZEFNV8g738T5bnVkpj0kzPDI2JBvdhixsblb0S5Q3xqB9wJmC29wPEhpUC dKGgsp4a7yKrwp10PV0kV07JMY3tu/wcHpcCOz9ehHQNgtCNYO2rw3+ykcHrfgqJqadR /nca6vst2uy/PtZx1l89fQtOMkRkuh3YX+bTIlqPdjkokm3bzUT+K0AsvvNFqfvHLMy0 SePL02zNyf7IW7UHhAmZqkNcPYpwee/buXEj2S98IVoU6yRDPj4XbvxaUkO+cpArHcN+ uouw== X-Gm-Message-State: AGi0Pualw5cIA5+bXJn6ebbs9JpNSvEHPj4uMslX/0n+V7nar07evzyD nAHz5Go3/1HJbowyLqC7T5BnQjsS66o= X-Google-Smtp-Source: APiQypKqt4zdReKZ3Ag1CmWU628rZfgL4oF5Z3XdCebXQsb5Bj8YA2x6ppVzXUH3AI/cRq75E8QZ+g== X-Received: by 2002:ac8:44d6:: with SMTP id b22mr24395973qto.366.1588007595342; Mon, 27 Apr 2020 10:13:15 -0700 (PDT) Received: from localhost (70.44.39.90.res-cmts.bus.ptd.net. [70.44.39.90]) by smtp.gmail.com with ESMTPSA id q57sm11571007qtj.55.2020.04.27.10.13.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Apr 2020 10:13:14 -0700 (PDT) Date: Mon, 27 Apr 2020 13:13:04 -0400 From: Johannes Weiner To: Yang Yingliang Cc: tj@kernel.org, lizefan@huawei.com, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, wangkefeng.wang@huawei.com, linux-mm@kvack.org, guro@cmpxchg.org Subject: Re: memleak in cgroup Message-ID: <20200427171304.GC29022@cmpxchg.org> References: <6e4d5208-ba26-93ed-c600-4776fc620456@huawei.com> <34dfdb52-6efd-7b11-07c8-9461a13b3aa4@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <34dfdb52-6efd-7b11-07c8-9461a13b3aa4@huawei.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org +cc Roman who has been looking the most at this area On Mon, Apr 27, 2020 at 03:48:13PM +0800, Yang Yingliang wrote: > +cc linux-mm@kvack.org > > On 2020/4/26 19:21, Yang Yingliang wrote: > > Hi, > > > > When I doing the follow test in kernel-5.7-rc2, I found mem-free is > > decreased > > > > #!/bin/sh > > cd /sys/fs/cgroup/memory/ > > > > for((i=0;i<45;i++)) > > do > >         for((j=0;j<60000;j++)) > >         do > >                 mkdir /sys/fs/cgroup/memory/yyl-cg$j > >         done > >         sleep 1 > >         ls /sys/fs/cgroup/memory/ | grep yyl | xargs rmdir > > done Should be easy enough to reproduce, thanks for the report. I'll try to take a look later this week, unless Roman beats me to it. Is this a new observation in 5.7-rc2? Can you provide /sys/fs/cgroup/unified/cgroup.stat after the test?