From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1754228AbcE3Hxs (ORCPT <rfc822;w@1wt.eu>);
	Mon, 30 May 2016 03:53:48 -0400
Received: from mail-lf0-f49.google.com ([209.85.215.49]:33595 "EHLO
	mail-lf0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1754011AbcE3Hxq convert rfc822-to-8bit (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Mon, 30 May 2016 03:53:46 -0400
MIME-Version: 1.0
In-Reply-To: <20160530021758.GG1689@yexl-desktop>
References: <20160530021758.GG1689@yexl-desktop>
From: Dmitry Vyukov <dvyukov@google.com>
Date: Mon, 30 May 2016 09:53:25 +0200
Message-ID: <CACT4Y+ZF_ES+qfZDS-dvQfoLfKd-Ca1aJobs4a=8LMONwTcSeQ@mail.gmail.com>
Subject: Re: [lkp] [mm] 55834c5909: boot-slabinfo.num_objs +31.9% increasement
To: kernel test robot <xiaolong.ye@intel.com>
Cc: Alexander Potapenko <glider@google.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Christoph Lameter <cl@linux.com>, Pekka Enberg <penberg@kernel.org>,
        David Rientjes <rientjes@google.com>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Andrey Konovalov <adech.fo@gmail.com>,
        Andrey Ryabinin <ryabinin.a.a@gmail.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Konstantin Serebryany <kcc@google.com>,
        Dmitry Chernenkov <dmitryc@google.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        LKML <linux-kernel@vger.kernel.org>, lkp@01.org
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8BIT
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Mon, May 30, 2016 at 4:17 AM, kernel test robot
<xiaolong.ye@intel.com> wrote:
>
> FYI, we noticed boot-slabinfo.num_objs +31.9% increasement due to commit:
>
> commit 55834c59098d0c5a97b0f3247e55832b67facdcf ("mm: kasan: initial memory quarantine implementation")
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>
> in testcase: boot
> on test machine: vm-lkp-wsx03-2G: 2 threads qemu-system-x86_64 -enable-kvm -cpu host with 2G memory
> with following parameters: sleep=1
>
>
> Details are as below:
> -------------------------------------------------------------------------------------------------->
>
>
> =========================================================================================
> compiler/kconfig/rootfs/sleep/tbox_group/testcase:
>   gcc-6/x86_64-randconfig-s4-05280557/debian-x86_64-2015-02-07.cgz/1/vm-lkp-wsx03-2G/boot
>
> commit:
>   b8f1a75d61d8405a753380c6fb17ba84a5603cd4
>   55834c59098d0c5a97b0f3247e55832b67facdcf
>
> b8f1a75d61d8405a 55834c59098d0c5a97b0f3247e
> ---------------- --------------------------
>          %stddev     %change         %stddev
>              \          |                \
>     165450 ±  0%     +31.9%     218176 ±  1%  boot-slabinfo.num_objs
>      19095 ±  5%    +104.3%      39013 ±  3%  boot-slabinfo.num_pages
>     107.27 ±  2%     +14.1%     122.43 ± 13%  boot-time.boot
>      97.13 ±  1%      +4.3%     101.31 ±  1%  boot-time.idle
>    1105076 ±  0%      -7.2%    1025056 ±  0%  boot-meminfo.MemFree
>      36269 ± 12%    +215.7%     114517 ±  5%  boot-meminfo.SUnreclaim
>      76469 ±  5%    +104.5%     156343 ±  4%  boot-meminfo.Slab
>
>
>
>                                boot-slabinfo.num_objs
>
>   230000 ++-----------------------------------------------------------------+
>          |            O                 O                                   |
>   220000 ++O O    O OO OO     O O OO OO                                     |
>          OO O OOOO O     OOOOOOO O  O OO O                                  |
>   210000 ++                                                                 |
>          |                                                                  |
>   200000 ++                                                                 |
>          |                                                                  |
>   190000 ++                                                                 |
>          |                                                                  |
>   180000 ++                                                                 |
>          |                                                                  |
>   170000 ++                                                                 |
>          ********************************************************************
>   160000 ++-----------------------------------------------------------------+
>
>
>                                boot-slabinfo.num_pages
>
>   45000 ++-------------O----------------------------------------------------+
>         | O  O      OO O O O O  OOO                                         |
>   40000 +O   OOO OO                OO O  O                                  |
>         O  OO      O  O O O O  OO    O  O                                   |
>         |       O             O        O                                    |
>   35000 ++                                                                  |
>         |                                                                   |
>   30000 ++                                                                  |
>         |                                                                   |
>   25000 ++                                                                  |
>         |                                                                   |
>         |                                                         *    *    *
>   20000 +* *  *  ** * *  *   * *  *   ** **** ** * *  *   * *  *  :: * *** *|
>         * * ** **  * * ** *** * ** ***  * *  *  * * ** *** * ** ** ** *   * |
>   15000 ++------------------------------------------------------------------+
>
>
>         [*] bisect-good sample
>         [O] bisect-bad  sample


Hi Xiaolong,

It is with CONFIG_KASAN=y? If yes, then increased memory usage is expected.