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Date:   Sun, 17 Sep 2017 09:39:49 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     Huang Ying <ying.huang@...el.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Andi Kleen <andi.kleen@...el.com>, Jan Kara <jack@...e.cz>,
        Michal Hocko <mhocko@...e.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Nadia Yvette Chambers <nyc@...omorphy.com>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        Hugh Dickins <hughd@...gle.com>,
        Minchan Kim <minchan@...nel.org>, Shaohua Li <shli@...com>,
        Christopher Lameter <cl@...ux.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [lkp-robot] [mm]  c79b57e462:  vm-scalability.throughput 25%
 improvement


Greeting,

FYI, we noticed a +25% improvement of vm-scalability.throughput due to commit:


commit: c79b57e462b5d2f47afa5f175cf1828f16e18612 ("mm: hugetlb: clear target sub-page last when clearing huge page")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

in testcase: vm-scalability
on test machine: 88 threads Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz with 128G memory
with following parameters:

	runtime: 300s
	size: 8T
	test: anon-w-seq-mt
	cpufreq_governor: performance

test-description: The motivation behind this suite is to exercise functions and regions of the mm/ of the Linux kernel which are of interest to us.
test-url: https://git.kernel.org/cgit/linux/kernel/git/wfg/vm-scalability.git/



Details are as below:
-------------------------------------------------------------------------------------------------->


To reproduce:

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     job.yaml

testcase/path_params/tbox_group/run: vm-scalability/300s-8T-anon-w-seq-mt-performance/lkp-bdw-ep2

212925802454672e  c79b57e462b5d2f47afa5f175c  
----------------  --------------------------  
         %stddev      change         %stddev
             \          |                \  
  34081895              25%   42690377        vm-scalability.throughput
    373299              24%     463391        vm-scalability.median
    513295              22%     627873        vm-scalability.time.voluntary_context_switches
   9548109              20%   11489781        vm-scalability.time.minor_page_faults
 9.052e+09              20%  1.089e+10        vm-scalability.workload
      8178                        8349        vm-scalability.time.system_time
  64389077              -4%   61913989        vm-scalability.time.maximum_resident_set_size
      0.01              -4%       0.00        vm-scalability.free_time
      6872              -9%       6273        vm-scalability.time.percent_of_cpu_this_job_got
     12564             -16%      10595        vm-scalability.time.user_time
    132010              -8%     120993        vmstat.system.in
  12161911             -26%    8950198        interrupts.CAL:Function_call_interrupts
     72723              27%      92011        pmeter.performance_per_watt
       468                         464        pmeter.Average_Active_Power
     37.97              -3%      36.78        boot-time.boot
      2996              -4%       2887        boot-time.idle
     23.10 ±  4%        -5%      21.96        boot-time.kernel_boot
     19.97 ±  5%        -5%      18.89 ±  3%  boot-time.dhcp
      0.57 ±  6%        36%       0.77 ± 11%  perf-stat.node-store-miss-rate%
 1.003e+09              32%  1.329e+09        perf-stat.node-loads
      0.51              32%       0.67        perf-stat.ipc
    169613              26%     212878        perf-stat.cpu-migrations
  67010904              25%   83501581        perf-stat.iTLB-loads
  2.42e+08              21%  2.929e+08        perf-stat.dTLB-load-misses
  95290199              21%  1.152e+08        perf-stat.dTLB-store-misses
 6.316e+12              21%  7.631e+12        perf-stat.dTLB-loads
 2.945e+13              21%  3.555e+13        perf-stat.instructions
 9.374e+12              21%  1.132e+13        perf-stat.branch-instructions
 1.433e+09              21%  1.729e+09        perf-stat.branch-misses
 2.432e+12              20%  2.926e+12        perf-stat.dTLB-stores
  10269271              19%   12214968        perf-stat.minor-faults
  10269275              19%   12214968        perf-stat.page-faults
 5.543e+08              18%  6.559e+08        perf-stat.node-load-misses
 1.064e+08              18%  1.257e+08 ±  3%  perf-stat.iTLB-load-misses
 3.017e+11              15%  3.458e+11        perf-stat.cache-references
     35.58              -7%      33.05        perf-stat.node-load-miss-rate%
 5.825e+13              -8%  5.337e+13        perf-stat.cpu-cycles
  1.02e+11             -16%  8.544e+10        perf-stat.cache-misses
 1.731e+10             -20%  1.381e+10        perf-stat.node-stores
      1.98             -24%       1.50        perf-stat.cpi
     33.80             -27%      24.70        perf-stat.cache-miss-rate%




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

View attachment "config-4.13.0-04373-gc79b57e" of type "text/plain" (162516 bytes)

View attachment "job-script" of type "text/plain" (7334 bytes)

View attachment "job.yaml" of type "text/plain" (4934 bytes)

View attachment "reproduce" of type "text/plain" (9760 bytes)

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