linux-kernel - [LKP] [kernfs] 2427d387fd2: -1.8% boot-slabinfo.num

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Date:	Mon, 09 Feb 2015 12:23:44 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Andrzej Hajda <a.hajda@...sung.com>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: [LKP] [kernfs] 2427d387fd2: -1.8% boot-slabinfo.num_objs

FYI, we noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
commit 2427d387fd24bc04a5c270161473eaca8239cd39 ("kernfs: convert node name allocation to kstrdup_const")

Some slab memory can be saved with the patch :)

testbox/testcase/testparams: lkp-t410/boot/performance-1

9f5b2beccb0ad113  2427d387fd24bc04a5c2701614  
----------------  --------------------------  
         %stddev     %change         %stddev
             \          |                \  
      1110 ±  2%      -8.5%       1016 ±  5%  boot-meminfo.PageTables
    144680 ±  0%      -2.1%     141631 ±  0%  boot-slabinfo.num_objs
    107666 ±  0%      -1.1%     106464 ±  0%  boot-meminfo.Slab
     26953 ±  0%      -1.0%      26672 ±  0%  boot-slabinfo.num_pages

testbox/testcase/testparams: lkp-a03/boot/performance-1

9f5b2beccb0ad113  2427d387fd24bc04a5c2701614  
----------------  --------------------------  
       fail:runs  %reproduction    fail:runs
           |             |             |    
        29 ± 28%     -60.2%         11 ± 49%  time.involuntary_context_switches
       166 ±  1%      -2.4%        162 ±  1%  boot-time.idle
    133976 ±  0%      -1.8%     131519 ±  0%  boot-slabinfo.num_objs

testbox/testcase/testparams: lkp-a04/boot/performance-1

9f5b2beccb0ad113  2427d387fd24bc04a5c2701614  
----------------  --------------------------  
    133681 ±  0%      -1.8%     131309 ±  0%  boot-slabinfo.num_objs

lkp-t410: Westmere
Memory: 2G

lkp-a03: Atom
Memory: 8G

lkp-a04: Atom
Memory: 8G


                               boot-slabinfo.num_pages

  27100 ++----------------------------*--*-*------*-------------------------+
        |                     .*..*.*         *.*                           |
  27000 ++                  .*                       *.                     |
        | *.. .*     .*.*..*                           *     .*     .*.*..*.*
  26900 ++   *  +  .*                                   +  .*  +  .*        |
        |:       *.                                      *.     *.          |
  26800 *+                                                                  |
        |                                                                   |
  26700 ++                               O        O  O O O      O           |
        |               O  O O O  O O O    O  O O           O O             |
  26600 ++                                                                  |
        | O    O                                                            |
  26500 O+   O   O  O O                                                     |
        |                                                                   |
  26400 ++------------------------------------------------------------------+



        [*] 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,
Huang, Ying



View attachment "job.yaml" of type "text/plain" (1252 bytes)

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