FYI, we noticed that fsmark.time.involuntary_context_switches +56.4% change with your commit: 

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
commit 9be4fd2c7723a3057b0b39676fe4c8d5fd7118a4 ("cpufreq: governor: Replace timers with utilization update callbacks")


=========================================================================================
compiler/disk/filesize/fs2/fs/iterations/kconfig/nr_directories/nr_files_per_directory/nr_threads/rootfs/sync_method/tbox_group/test_size/testcase:
  gcc-4.9/1HDD/8K/nfsv4/ext4/1x/x86_64-rhel/16d/256fpd/32t/debian-x86_64-2015-02-07.cgz/fsyncBeforeClose/lkp-ws02/400M/fsmark

commit: 
  a4675fbc4a7abe072ac6ba38c252f22a91ebcd94
  9be4fd2c7723a3057b0b39676fe4c8d5fd7118a4

a4675fbc4a7abe07 9be4fd2c7723a3057b0b39676f 
---------------- -------------------------- 
         %stddev     %change         %stddev
             \          |                \  
     70792 ±  0%     +56.4%     110713 ±  1%  fsmark.time.involuntary_context_switches
    108756 ±  2%     -10.4%      97492 ±  6%  meminfo.DirectMap4k
     70792 ±  0%     +56.4%     110713 ±  1%  time.involuntary_context_switches
     21.50 ± 57%     +48.8%      32.00 ±  2%  turbostat.Avg_MHz
     92879 ±  1%     -12.2%      81528 ±  2%  softirqs.RCU
    107180 ±  1%     -19.4%      86414 ±  0%  softirqs.SCHED
      7477 ±  0%      +7.5%       8036 ±  0%  vmstat.system.cs
    710.75 ±  0%     +92.2%       1366 ±  2%  vmstat.system.in
 1.165e+09 ±  0%     -12.3%  1.022e+09 ±  3%  cpuidle.C3-NHM.time
    266839 ±  1%     -20.5%     212259 ±  2%  cpuidle.C3-NHM.usage
  58012774 ±  4%     +26.7%   73508891 ±  2%  cpuidle.POLL.time


lkp-ws02: Westmere-EP
Memory: 16G


                      fsmark.time.involuntary_context_switches

  115000 ++-----------------------------------------------------------------+
         |                                          OOOO O   OOO            |
  110000 ++        O                                      OO    O O         |
  105000 +O   O  O   O  O  O  O OO OOO  O  O O  OO                          |
         O  OO O  O   OO  O O  O       O O  O O   O                         |
  100000 ++                                                                 |
   95000 ++                                                                 |
         |                                                                  |
   90000 ++                                                                 |
   85000 ++                                                                 |
         |                                                                  |
   80000 ++                                                                 |
   75000 ++                                                                 |
         |     *.***.* **.            .***.****.***.                        |
   70000 **-***-------*---***-****-***--------------****-***-****-***-****-**


                          time.involuntary_context_switches

  115000 ++-----------------------------------------------------------------+
         |                                          OOOO O   OOO            |
  110000 ++        O                                      OO    O O         |
  105000 +O   O  O   O  O  O  O OO OOO  O  O O  OO                          |
         O  OO O  O   OO  O O  O       O O  O O   O                         |
  100000 ++                                                                 |
   95000 ++                                                                 |
         |                                                                  |
   90000 ++                                                                 |
   85000 ++                                                                 |
         |                                                                  |
   80000 ++                                                                 |
   75000 ++                                                                 |
         |     *.***.* **.            .***.****.***.                        |
   70000 **-***-------*---***-****-***--------------****-***-****-***-****-**


                                 vmstat.system.in

  1500 ++-------------------------------------------------------------------+
       |                                                                    |
  1400 ++                                          OOO OO  OOO O            |
  1300 +O OO      O O OO    O  OO OOO OOO OOOO O         O      OO          |
       O    O OOO  O    O OO  O                                             |
  1200 ++                                       OO                          |
       |                                                                    |
  1100 ++                                                                   |
       |                                                                    |
  1000 ++                                                                   |
   900 ++                                                                   |
       |                                                                    |
   800 ++.*  .** .*  .**   *     .*     *. ** .* *.  *.     *               |
       **  **   *  **   *.* *.***  **.**  *  *  *  **  ***.* *.***.***.*    |
   700 ++---------------------------------------------------------------**-**


	[*] 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.