[linus:master] [mm] d2136d749d: vm-scalability.throughput -7.1% regression

[kernel test robot <oliver.sang@intel.com>]

Hello,

kernel test robot noticed a -7.1% regression of vm-scalability.throughput on:


commit: d2136d749d76af980b3accd72704eea4eab625bd ("mm: support multi-size THP numa balancing")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

[still regression on linus/master 92e5605a199efbaee59fb19e15d6cc2103a04ec2]


testcase: vm-scalability
test machine: 128 threads 2 sockets Intel(R) Xeon(R) Gold 6338 CPU @ 2.00GHz (Ice Lake) with 256G memory
parameters:

	runtime: 300s
	size: 512G
	test: anon-cow-rand-hugetlb
	cpufreq_governor: performance



If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202406201010.a1344783-oliver.sang@intel.com


Details are as below:
-------------------------------------------------------------------------------------------------->


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20240620/202406201010.a1344783-oliver.sang@intel.com

=========================================================================================
compiler/cpufreq_governor/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
  gcc-13/performance/x86_64-rhel-8.3/debian-12-x86_64-20240206.cgz/300s/512G/lkp-icl-2sp2/anon-cow-rand-hugetlb/vm-scalability

commit: 
  6b0ed7b3c7 ("mm: factor out the numa mapping rebuilding into a new helper")
  d2136d749d ("mm: support multi-size THP numa balancing")

6b0ed7b3c77547d2 d2136d749d76af980b3accd7270 
---------------- --------------------------- 
         %stddev     %change         %stddev
             \          |                \  
     12.02            -1.3       10.72 ±  4%  mpstat.cpu.all.sys%
   1228757            +3.0%    1265679        proc-vmstat.pgfault
   7392513            -7.1%    6865649        vm-scalability.throughput
     17356            +9.4%      18986        vm-scalability.time.user_time
      0.32 ± 22%     -36.9%       0.20 ± 17%  sched_debug.cfs_rq:/.h_nr_running.stddev
     28657 ± 86%     -90.8%       2640 ± 19%  sched_debug.cfs_rq:/.load.stddev
      0.28 ± 35%     -52.1%       0.13 ± 29%  sched_debug.cfs_rq:/.nr_running.stddev
    299.88 ± 27%     -39.6%     181.04 ± 23%  sched_debug.cfs_rq:/.runnable_avg.stddev
    284.88 ± 32%     -44.0%     159.65 ± 27%  sched_debug.cfs_rq:/.util_avg.stddev
      0.32 ± 22%     -37.2%       0.20 ± 17%  sched_debug.cpu.nr_running.stddev
 1.584e+10 ±  2%      -6.9%  1.476e+10 ±  3%  perf-stat.i.branch-instructions
  11673151 ±  3%      -6.3%   10935072 ±  4%  perf-stat.i.branch-misses
      4.90            +3.5%       5.07        perf-stat.i.cpi
    333.40            +7.5%     358.32        perf-stat.i.cycles-between-cache-misses
 6.787e+10 ±  2%      -6.8%  6.324e+10 ±  3%  perf-stat.i.instructions
      0.25            -6.2%       0.24        perf-stat.i.ipc
      4.19            +7.5%       4.51        perf-stat.overall.cpi
    323.02            +7.4%     346.94        perf-stat.overall.cycles-between-cache-misses
      0.24            -7.0%       0.22        perf-stat.overall.ipc
 1.549e+10 ±  2%      -6.8%  1.444e+10 ±  3%  perf-stat.ps.branch-instructions
 6.634e+10 ±  2%      -6.7%  6.186e+10 ±  3%  perf-stat.ps.instructions
     17.33 ± 77%     -10.6        6.72 ±169%  perf-profile.calltrace.cycles-pp.asm_exc_page_fault.do_access
     17.30 ± 77%     -10.6        6.71 ±169%  perf-profile.calltrace.cycles-pp.exc_page_fault.asm_exc_page_fault.do_access
     17.30 ± 77%     -10.6        6.71 ±169%  perf-profile.calltrace.cycles-pp.do_user_addr_fault.exc_page_fault.asm_exc_page_fault.do_access
     17.28 ± 77%     -10.6        6.70 ±169%  perf-profile.calltrace.cycles-pp.handle_mm_fault.do_user_addr_fault.exc_page_fault.asm_exc_page_fault.do_access
     17.27 ± 77%     -10.6        6.70 ±169%  perf-profile.calltrace.cycles-pp.hugetlb_fault.handle_mm_fault.do_user_addr_fault.exc_page_fault.asm_exc_page_fault
     13.65 ± 76%      -8.4        5.29 ±168%  perf-profile.calltrace.cycles-pp.hugetlb_wp.hugetlb_fault.handle_mm_fault.do_user_addr_fault.exc_page_fault
     13.37 ± 76%      -8.2        5.18 ±168%  perf-profile.calltrace.cycles-pp.copy_user_large_folio.hugetlb_wp.hugetlb_fault.handle_mm_fault.do_user_addr_fault
     13.35 ± 76%      -8.2        5.18 ±168%  perf-profile.calltrace.cycles-pp.copy_subpage.copy_user_large_folio.hugetlb_wp.hugetlb_fault.handle_mm_fault
     13.23 ± 76%      -8.1        5.13 ±168%  perf-profile.calltrace.cycles-pp.copy_mc_enhanced_fast_string.copy_subpage.copy_user_large_folio.hugetlb_wp.hugetlb_fault
      3.59 ± 78%      -2.2        1.39 ±169%  perf-profile.calltrace.cycles-pp.__mutex_lock.hugetlb_fault.handle_mm_fault.do_user_addr_fault.exc_page_fault
     17.35 ± 77%     -10.6        6.73 ±169%  perf-profile.children.cycles-pp.asm_exc_page_fault
     17.32 ± 77%     -10.6        6.72 ±168%  perf-profile.children.cycles-pp.do_user_addr_fault
     17.32 ± 77%     -10.6        6.72 ±168%  perf-profile.children.cycles-pp.exc_page_fault
     17.30 ± 77%     -10.6        6.71 ±168%  perf-profile.children.cycles-pp.handle_mm_fault
     17.28 ± 77%     -10.6        6.70 ±169%  perf-profile.children.cycles-pp.hugetlb_fault
     13.65 ± 76%      -8.4        5.29 ±168%  perf-profile.children.cycles-pp.hugetlb_wp
     13.37 ± 76%      -8.2        5.18 ±168%  perf-profile.children.cycles-pp.copy_user_large_folio
     13.35 ± 76%      -8.2        5.18 ±168%  perf-profile.children.cycles-pp.copy_subpage
     13.34 ± 76%      -8.2        5.17 ±168%  perf-profile.children.cycles-pp.copy_mc_enhanced_fast_string
      3.59 ± 78%      -2.2        1.39 ±169%  perf-profile.children.cycles-pp.__mutex_lock
     13.24 ± 76%      -8.1        5.13 ±168%  perf-profile.self.cycles-pp.copy_mc_enhanced_fast_string



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.


-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki