Greeting,

FYI, we noticed a 4.9% improvement of will-it-scale.per_thread_ops due to commit:


commit: 4389ee2a0b018bba7838240dc91f55a2e3cf88a9 ("mm/page_alloc: remove add_to_free_list check")
git://bee.sh.intel.com/git/aaron/linux.git remove_add_to_list

in testcase: will-it-scale
on test machine: 16 threads Intel(R) Atom(R) CPU 3958 @ 2.00GHz with 64G memory
with following parameters:

	nr_task: 100%
	mode: thread
	test: page_fault2
	cpufreq_governor: performance

test-description: Will It Scale takes a testcase and runs it from 1 through to n parallel copies to see if the testcase will scale. It builds both a process and threads based test in order to see any differences between the two.
test-url: https://github.com/antonblanchard/will-it-scale



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: will-it-scale/100%-thread-page_fault2-performance/lkp-denverton2

98b9f8a4549909c6  4389ee2a0b018bba7838240dc9  
----------------  --------------------------  
     63754               5%      66885        will-it-scale.per_thread_ops
    300882               5%     315437        will-it-scale.time.voluntary_context_switches
 3.081e+08               5%  3.229e+08        will-it-scale.time.minor_page_faults
     60.76               4%      63.42        will-it-scale.time.user_time
       826               4%        862        will-it-scale.time.percent_of_cpu_this_job_got
      2432               4%       2537        will-it-scale.time.system_time
   1674576               3%    1727956        will-it-scale.time.involuntary_context_switches
     28306              -5%      26868 ±  5%  vmstat.system.in
     10607              25%      13217 ± 13%  perf-stat.cpu-migrations
 5.136e+12               6%  5.419e+12        perf-stat.cpu-cycles
 3.084e+08               5%  3.234e+08        perf-stat.minor-faults
 3.084e+08               5%  3.234e+08        perf-stat.page-faults
 1.188e+12               5%  1.244e+12        perf-stat.iTLB-loads
  2.07e+11               4%  2.159e+11        perf-stat.branch-instructions
 1.191e+12               4%  1.241e+12        perf-stat.instructions
 1.998e+11               4%  2.081e+11        perf-stat.cache-references
 4.784e+10               3%  4.944e+10        perf-stat.cache-misses


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