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=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 3F504C55191 for ; Sun, 26 Apr 2020 11:22:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1FD8B2071C for ; Sun, 26 Apr 2020 11:22:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726174AbgDZLWB (ORCPT ); Sun, 26 Apr 2020 07:22:01 -0400 Received: from szxga04-in.huawei.com ([45.249.212.190]:2913 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726122AbgDZLWA (ORCPT ); Sun, 26 Apr 2020 07:22:00 -0400 Received: from DGGEMS408-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id 831E4FD2101CB4A16730; Sun, 26 Apr 2020 19:21:57 +0800 (CST) Received: from [127.0.0.1] (10.166.215.99) by DGGEMS408-HUB.china.huawei.com (10.3.19.208) with Microsoft SMTP Server id 14.3.487.0; Sun, 26 Apr 2020 19:21:48 +0800 From: Yang Yingliang Subject: memleak in cgroup To: , , CC: , , , Message-ID: <6e4d5208-ba26-93ed-c600-4776fc620456@huawei.com> Date: Sun, 26 Apr 2020 19:21:48 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-Originating-IP: [10.166.215.99] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 before test the /proc/meminfo is: MemTotal:       493554824 kB MemFree:        491240912 kB MemAvailable:   489424520 kB Buffers:            4112 kB Cached:            65400 kB SwapCached:            0 kB Active:           156016 kB Inactive:          37720 kB Active(anon):     128372 kB Inactive(anon):     7188 kB Active(file):      27644 kB Inactive(file):    30532 kB Unevictable:           0 kB Mlocked:               0 kB SwapTotal:       4194300 kB SwapFree:        4194300 kB Dirty:               112 kB Writeback:             0 kB AnonPages:        124356 kB Mapped:            53724 kB Shmem:             11036 kB KReclaimable:      93488 kB Slab:             599660 kB SReclaimable:      93488 kB SUnreclaim:       506172 kB KernelStack:       23008 kB PageTables:         4340 kB NFS_Unstable:          0 kB Bounce:                0 kB WritebackTmp:          0 kB CommitLimit:    250971712 kB Committed_AS:    1834448 kB VmallocTotal:   135290159040 kB VmallocUsed:      229284 kB VmallocChunk:          0 kB Percpu:            80896 kB HardwareCorrupted:     0 kB AnonHugePages:     43008 kB ShmemHugePages:        0 kB ShmemPmdMapped:        0 kB FileHugePages:         0 kB FilePmdMapped:         0 kB CmaTotal:          65536 kB CmaFree:           40480 kB HugePages_Total:       0 HugePages_Free:        0 HugePages_Rsvd:        0 HugePages_Surp:        0 Hugepagesize:       2048 kB Hugetlb:               0 kB after test: MemTotal:       493554824 kB MemFree:        484492920 kB MemAvailable:   482801124 kB Buffers:           21984 kB Cached:           151380 kB SwapCached:            0 kB Active:           230000 kB Inactive:          68068 kB Active(anon):     130108 kB Inactive(anon):    13804 kB Active(file):      99892 kB Inactive(file):    54264 kB Unevictable:           0 kB Mlocked:               0 kB SwapTotal:       4194300 kB SwapFree:        4194300 kB Dirty:                36 kB Writeback:             0 kB AnonPages:        125080 kB Mapped:            55520 kB Shmem:             19220 kB KReclaimable:     246696 kB Slab:            5381572 kB SReclaimable:     246696 kB SUnreclaim:      5134876 kB KernelStack:       27360 kB PageTables:         4172 kB NFS_Unstable:          0 kB Bounce:                0 kB WritebackTmp:          0 kB CommitLimit:    250971712 kB Committed_AS:    1588600 kB VmallocTotal:   135290159040 kB VmallocUsed:      230836 kB VmallocChunk:          0 kB Percpu:          1827840 kB HardwareCorrupted:     0 kB AnonHugePages:     43008 kB ShmemHugePages:        0 kB ShmemPmdMapped:        0 kB FileHugePages:         0 kB FilePmdMapped:         0 kB CmaTotal:          65536 kB CmaFree:           40480 kB HugePages_Total:       0 HugePages_Free:        0 HugePages_Rsvd:        0 HugePages_Surp:        0 Hugepagesize:       2048 kB Hugetlb:               0 kB after echo 3 > /proc/sys/vm/drop_caches MemTotal:       493554824 kB MemFree:        485104048 kB MemAvailable:   483358392 kB Buffers:            6168 kB Cached:            79904 kB SwapCached:            0 kB Active:           165348 kB Inactive:          45780 kB Active(anon):     130528 kB Inactive(anon):    13800 kB Active(file):      34820 kB Inactive(file):    31980 kB Unevictable:           0 kB Mlocked:               0 kB SwapTotal:       4194300 kB SwapFree:        4194300 kB Dirty:                 8 kB Writeback:             0 kB AnonPages:        125236 kB Mapped:            55516 kB Shmem:             19220 kB KReclaimable:     226332 kB Slab:            5353952 kB SReclaimable:     226332 kB SUnreclaim:      5127620 kB KernelStack:       23040 kB PageTables:         4212 kB NFS_Unstable:          0 kB Bounce:                0 kB WritebackTmp:          0 kB CommitLimit:    250971712 kB Committed_AS:    1672424 kB VmallocTotal:   135290159040 kB VmallocUsed:      230436 kB VmallocChunk:          0 kB Percpu:          1379840 kB HardwareCorrupted:     0 kB AnonHugePages:     43008 kB ShmemHugePages:        0 kB ShmemPmdMapped:        0 kB FileHugePages:         0 kB FilePmdMapped:         0 kB CmaTotal:          65536 kB CmaFree:           40480 kB HugePages_Total:       0 HugePages_Free:        0 HugePages_Rsvd:        0 HugePages_Surp:        0 Hugepagesize:       2048 kB Hugetlb:               0 kB after test and drop caches, the /proc/cgroups is: #subsys_name    hierarchy       num_cgroups     enabled cpuset  11      1       1 cpu     2       1       1 cpuacct 2       1       1 blkio   8       1       1 memory  5       83      1 devices 3       41      1 freezer 6       1       1 net_cls 9       1       1 perf_event      10      1       1 net_prio        9       1       1 hugetlb 4       1       1 pids    7       51      1 rdma    12      1       1 All the dir that created by the script is already removed, but I got:  - MemFree is decreased about 6.7G  - SUnreclaim is increased about 4.6G  - Percpu is increased about 1.7G It seems we have memory leak in cgroup ?