linux-kernel - Re: [lkp] [shmem] 071904e8df: meminfo.AnonHugePages +553.5% increase

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Date:	Thu, 4 Aug 2016 12:54:11 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	kernel test robot <xiaolong.ye@...el.com>
Cc:	Hugh Dickins <hughd@...gle.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: Re: [lkp] [shmem]  071904e8df: meminfo.AnonHugePages +553.5% increase

On Thu, Aug 04, 2016 at 04:54:09PM +0800, kernel test robot wrote:
> 
> FYI, we noticed meminfo.AnonHugePages +553.5% increase due to commit:
> 
> commit 071904e8dfed9525f9da86523caf78b6da5f9e7e ("shmem: get_unmapped_area align huge page")
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> 
> in testcase: vm-scalability
> on test machine: 128 threads 4 Sockets Haswell-EP with 512G memory
> with following parameters:
> 
> 	path_params: 300s-16G-shm-pread-rand-mt-performance
> 	run: 
> 
> 
> 
> 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.
> 
> Details are as below:
> -------------------------------------------------------------------------------------------------->
> 
> 
> 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
> 
> =========================================================================================
> compiler/cpufreq_governor/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
>   gcc-6/performance/x86_64-rhel/debian-x86_64-2015-02-07.cgz/300s/16G/lkp-hsw-4ep1/shm-pread-rand-mt/vm-scalability
> 
> commit: 
>   6a028aa3ca ("shmem: prepare huge= mount option and sysfs knob")
>   071904e8df ("shmem: get_unmapped_area align huge page")
> 
> 6a028aa3ca32379e 071904e8dfed9525f9da86523c 
> ---------------- -------------------------- 
>          %stddev     %change         %stddev
>              \          |                \  
>      20428 ±  9%    +553.5%     133500 ±  7%  meminfo.AnonHugePages
>      42717 ±  4%    +261.3%     154340 ±  6%  meminfo.AnonPages

Hm. That's strange. I didn't expect this commit change anything for anon
memory.

Do you see the same effect from the commit in Linus' tree?

-- 
 Kirill A. Shutemov