linux-kernel - [LKP] [mm] f1820361f83: -53.5% proc-vmstat.pgfault

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Message-ID: <20140930080557.GE9561@wfg-t540p.sh.intel.com>
Date:	Tue, 30 Sep 2014 16:05:57 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	Dave Hansen <dave.hansen@...el.com>,
	LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [LKP] [mm] f1820361f83: -53.5% proc-vmstat.pgfault

Hi Kirill,

FYI, we noticed 53.5% reduction of page faults and more mmap pages on

commit f1820361f83d556a7f0a9f629100f3825e594328 ("mm: implement ->map_pages for page cache")

testbox/testcase/testparams: lituya/will-it-scale/brk1

8c6e50b0290c4c7  f1820361f83d556a7f0a9f629  
---------------  -------------------------  
   1111649 ± 0%     -53.5%     517160 ± 0%  proc-vmstat.pgfault
        42 ±15%     -39.6%         25 ±22%  sched_debug.cpu#0.load
        21 ±23%     +45.3%         30 ±20%  sched_debug.cfs_rq[3]:/.runnable_load_avg
      1907 ± 0%     +56.4%       2983 ± 0%  proc-vmstat.nr_mapped
      7631 ± 0%     +56.4%      11938 ± 0%  meminfo.Mapped
      5002 ± 0%     +42.3%       7119 ± 0%  time.maximum_resident_set_size
     38824 ±17%     +40.3%      54478 ±19%  sched_debug.cpu#4.nr_load_updates
    572834 ±18%     +32.3%     757713 ±10%  sched_debug.cpu#4.sched_count
    563679 ±18%     +32.3%     745714 ±11%  sched_debug.cpu#4.nr_switches
    280478 ±18%     +32.3%     371078 ±11%  sched_debug.cpu#4.sched_goidle
     67648 ± 0%     +25.6%      84935 ± 0%  meminfo.Active(file)
     16911 ± 0%     +25.6%      21233 ± 0%  proc-vmstat.nr_active_file
        21 ± 9%     +27.5%         27 ±17%  sched_debug.cfs_rq[2]:/.runnable_load_avg
    331375 ±18%     +31.0%     434139 ± 9%  sched_debug.cpu#4.ttwu_count
    104185 ± 0%     +16.6%     121516 ± 0%  meminfo.Active
      2716 ± 0%     +15.5%       3138 ± 0%  proc-vmstat.pgactivate
     22227 ± 0%     -40.5%      13227 ± 0%  time.minor_page_faults
  14852144 ± 3%      +7.5%   15967380 ± 4%  time.voluntary_context_switches
    103047 ± 3%      +7.1%     110336 ± 4%  vmstat.system.cs


                               time.minor_page_faults

   3000 ++------------------------------------------------------------------+
   2800 *+*..*.*..*.*..*.*.*..*.*..*.*..*.*.*..*.*..*.*..*.*.*..*.*..*.*..*.*
        |                                                                   |
   2600 ++                                                                  |
   2400 ++                                                                  |
        |                                                                   |
   2200 ++                                                                  |
   2000 ++                                                                  |
   1800 ++                                                                  |
        |                                                                   |
   1600 ++                                                                  |
   1400 ++                                                                  |
        |                                                                   |
   1200 O+O  O O  O O  O O O  O O  O O  O O O  O O  O O  O O O  O O  O O  O |
   1000 ++------------------------------------------------------------------+

	[*] bisect-good sample
	[O] bisect-bad  sample

To reproduce:

	apt-get install ruby ruby-oj
	git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
	cd lkp-tests
	bin/setup-local job.yaml # the job file attached in this email
	bin/run-local   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,
Fengguang

View attachment "job.yaml" of type "text/plain" (1292 bytes)

View attachment "reproduce" of type "text/plain" (31 bytes)

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