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=-0.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, 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 16BDFC54FCB for ; Mon, 27 Apr 2020 17:13:18 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id CB32F2168B for ; Mon, 27 Apr 2020 17:13:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=cmpxchg-org.20150623.gappssmtp.com header.i=@cmpxchg-org.20150623.gappssmtp.com header.b="YX8ypOO5" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CB32F2168B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=cmpxchg.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 14DA98E0005; Mon, 27 Apr 2020 13:13:17 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 0FEDE8E0001; Mon, 27 Apr 2020 13:13:17 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 014618E0005; Mon, 27 Apr 2020 13:13:16 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0196.hostedemail.com [216.40.44.196]) by kanga.kvack.org (Postfix) with ESMTP id DBAD88E0001 for ; Mon, 27 Apr 2020 13:13:16 -0400 (EDT) Received: from smtpin19.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 957C4181AEF09 for ; Mon, 27 Apr 2020 17:13:16 +0000 (UTC) X-FDA: 76754280792.19.knife87_56c018cca4531 X-HE-Tag: knife87_56c018cca4531 X-Filterd-Recvd-Size: 4023 Received: from mail-qt1-f194.google.com (mail-qt1-f194.google.com [209.85.160.194]) by imf28.hostedemail.com (Postfix) with ESMTP for ; Mon, 27 Apr 2020 17:13:16 +0000 (UTC) Received: by mail-qt1-f194.google.com with SMTP id v26so9315105qto.0 for ; Mon, 27 Apr 2020 10:13:15 -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=KLZIccW77FEHmjvo4HJGJU2u7hxzlg6iBfvix3xKUaWvSU8ugZDep2dQjbMeek5J+w +lUBXD2CvmeSW+L5fUKr9Oo9twMJY3qxyVnPkJQHm5aAB9c3u0Y2OTuuXkMhi993ggMu K2cOZ8jNXl5pJ4X2cw8xjxIq7zSJ77bT8FTGNmr5Nwr76llyr+TeMPQY0/S9OPORzXJ6 JnRcBIeU9QtPp/yCez0v/L/BlQEARjN3WNl7JlCB8jbE3dD6tqvWrvJlCSd9SXWLUD9k HOUXpXKiu7liz2R/y20hELRW6zGVZ5jm6hpZuXp1yYPICyim9pnmncx9sg7QZGAwP6Mv 5dhQ== X-Gm-Message-State: AGi0PuZBQttd1M6Ebm82eeBUjIAEJMSaeTrfljt9ifg2RrYBQDAyhP02 u0cxBA4ch+ijn+jFi4hHgJJxFQ== 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 In-Reply-To: <34dfdb52-6efd-7b11-07c8-9461a13b3aa4@huawei.com> 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: +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 >=20 > On 2020/4/26 19:21, Yang Yingliang wrote: > > Hi, > >=20 > > When I doing the follow test in kernel-5.7-rc2, I found mem-free is > > decreased > >=20 > > #!/bin/sh > > cd /sys/fs/cgroup/memory/ > >=20 > > for((i=3D0;i<45;i++)) > > do > > =A0=A0=A0=A0=A0=A0=A0 for((j=3D0;j<60000;j++)) > > =A0=A0=A0=A0=A0=A0=A0 do > > =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 mkdir /sys/fs/cgroup/me= mory/yyl-cg$j > > =A0=A0=A0=A0=A0=A0=A0 done > > =A0=A0=A0=A0=A0=A0=A0 sleep 1 > > =A0=A0=A0=A0=A0=A0=A0 ls /sys/fs/cgroup/memory/ | grep yyl | xargs rm= dir > > 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?