FYI, we noticed that phoronix-test-suite.time.involuntary_context_switches +442.2% change on

https://github.com/0day-ci/linux Kent-Overstreet/mm-Refactor-find_get_pages-friends/20160401-104010
commit efe186b040db472412151e66616efef8d2b5dfd7 ("mm: Real pagecache iterators")


=========================================================================================
compiler/kconfig/rootfs/tbox_group/test/testcase:
  gcc-4.9/x86_64-rhel/debian-full-x86_64/lkp-ne02/postmark-1.1.0/phoronix-test-suite

commit: 
  8bc43c95e70464f4621317a59e405d901f00d13b
  efe186b040db472412151e66616efef8d2b5dfd7

8bc43c95e70464f4 efe186b040db472412151e6661 
---------------- -------------------------- 
       fail:runs  %reproduction    fail:runs
           |             |             |    
         %stddev     %change         %stddev
             \          |                \  
    170373 ±  1%    +442.2%     923755 ±  0%  phoronix-test-suite.time.involuntary_context_switches
     24546 ±  0%      -0.9%      24320 ±  0%  phoronix-test-suite.time.maximum_resident_set_size
   6933914 ±  1%      -2.3%    6775202 ±  0%  phoronix-test-suite.time.voluntary_context_switches
    170373 ±  1%    +442.2%     923755 ±  0%  time.involuntary_context_switches


lkp-ne02: Nehalem-EP
Memory: 4G



                 phoronix-test-suite.time.involuntary_context_switches

  1.4e+06 ++----------------------------------------------------------------+
          |                                                                 |
  1.2e+06 ++                 O                                              |
          |                                                                 |
    1e+06 ++                                                                |
          |         OO OO O   O O O OO  O O                                 |
   800000 O+  O O  O                                                        |
          |                                                                 |
   600000 ++                                                                |
          |                                                                 |
   400000 ++                                                                |
          |                                                                 |
   200000 *+ **.**  **.*   *  *  **.**  *.* *  *.**.* *.**.**.**.* *.*  **.**
          |:+     + :   :  :+ :+ :    + :  ::+ :     ::           ::  :+    |
        0 +O-O---O-*----*-*O-*--*O-----O---*--*------*------------*---*-----+


                           time.involuntary_context_switches

  1.4e+06 ++----------------------------------------------------------------+
          |                                                                 |
  1.2e+06 ++                 O                                              |
          |                                                                 |
    1e+06 ++                                                                |
          |         OO OO O   O O O OO  O O                                 |
   800000 O+  O O  O                                                        |
          |                                                                 |
   600000 ++                                                                |
          |                                                                 |
   400000 ++                                                                |
          |                                                                 |
   200000 *+ **.**  **.*   *  *  **.**  *.* *  *.**.* *.**.**.**.* *.*  **.**
          |:+     + :   :  :+ :+ :    + :  ::+ :     ::           ::  :+    |
        0 +O-O---O-*----*-*O-*--*O-----O---*--*------*------------*---*-----+


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

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