linux-kernel - Re: [lkp] [mm] 6f25a14a70: will-it-scale.scalability -4.0% regression

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Message-ID: <5705C886.90708@huawei.com>
Date:	Thu, 7 Apr 2016 10:40:06 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	kernel test robot <xiaolong.ye@...el.com>
CC:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Joonsoo Kim <js1304@...il.com>,
	David Rientjes <rientjes@...gle.com>,
	Laura Abbott <lauraa@...eaurora.org>,
	Hui Zhu <zhuhui@...omi.com>,
	Wang Xiaoqiang <wangxq10@....edu.cn>,
	LKML <linux-kernel@...r.kernel.org>, <lkp@...org>
Subject: Re: [lkp] [mm] 6f25a14a70: will-it-scale.scalability -4.0% regression

On 2016/4/7 9:06, kernel test robot wrote:

> FYI, we noticed that will-it-scale.scalability -4.0% regression on
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> commit 6f25a14a7053b69917e2ebea0d31dd444cd31fd5 ("mm: fix invalid node in alloc_migrate_target()")
> 

alloc_migrate_target() is called from cma or mem-offline.
I have no idea what's the relation between these, any ideas?

Thanks,
Xishi Qiu

> 
> =========================================================================================
> compiler/cpufreq_governor/kconfig/rootfs/tbox_group/test/testcase:
>   gcc-4.9/performance/x86_64-rhel/debian-x86_64-2015-02-07.cgz/lkp-ivb-d03/pthread_mutex1/will-it-scale
> 
> commit: 
>   969e8d7e47f93ef693028667480558de8f70523f
>   6f25a14a7053b69917e2ebea0d31dd444cd31fd5
> 
> 969e8d7e47f93ef6 6f25a14a7053b69917e2ebea0d 
> ---------------- -------------------------- 
>        fail:runs  %reproduction    fail:runs
>          %stddev     %change         %stddev
>              \          |                \  
>  2.032e+08 ±  0%      -1.6%      2e+08 ±  0%  will-it-scale.per_process_ops
>       0.83 ±  0%      -4.0%       0.79 ±  0%  will-it-scale.scalability
>     214103 ± 14%     -20.2%     170884 ± 14%  sched_debug.cpu.ttwu_count.stddev
>       3789 ±  7%     -10.3%       3398 ±  6%  slabinfo.anon_vma_chain.active_objs
>       4660 ±  5%      +7.7%       5019 ±  2%  vmstat.system.in
> 
> 
> lkp-ivb-d03: Ivy Bridge
> Memory: 4G
> 
> 
> 
> To reproduce:
> 
>         git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
>         cd lkp-tests
>         bin/lkp install job.yaml  # job file is attached in this email
>         bin/lkp run     job.yaml
> 
> 
> Disclaimer:
> Results have been estimated based on internal Intel analysis and are provided
> for informational purposes only. Any difference in system hardware or software
> design or configuration may affect actual performance.
> 
> 
> Thanks,
> Xiaolong Ye