linux-kernel - Re: [lkp] [mm] 55834c5909: boot-slabinfo.num

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Date:	Mon, 30 May 2016 09:53:25 +0200
From:	Dmitry Vyukov <dvyukov@...gle.com>
To:	kernel test robot <xiaolong.ye@...el.com>
Cc:	Alexander Potapenko <glider@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrey Konovalov <adech.fo@...il.com>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Konstantin Serebryany <kcc@...gle.com>,
	Dmitry Chernenkov <dmitryc@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: Re: [lkp] [mm] 55834c5909: boot-slabinfo.num_objs +31.9% increasement

On Mon, May 30, 2016 at 4:17 AM, kernel test robot
<xiaolong.ye@...el.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.