[linus:master] [ns] c0aac5975b: stress-ng.bind-mount.ops_per_sec 5.0% improvement

Hello,

kernel test robot noticed a 5.0% improvement of stress-ng.bind-mount.ops_per_sec on:


commit: c0aac5975bafc86f6817b14e9f71dcb5064a9183 ("ns: pad refcount")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master


testcase: stress-ng
config: x86_64-rhel-9.4
compiler: gcc-14
test machine: 64 threads 2 sockets Intel(R) Xeon(R) Gold 6346 CPU @ 3.10GHz (Ice Lake) with 256G memory
parameters:

	nr_threads: 100%
	disk: 1HDD
	testtime: 60s
	fs: xfs
	test: bind-mount
	cpufreq_governor: performance


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


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20260227/[email protected]

=========================================================================================
compiler/cpufreq_governor/disk/fs/kconfig/nr_threads/rootfs/tbox_group/test/testcase/testtime:
  gcc-14/performance/1HDD/xfs/x86_64-rhel-9.4/100%/debian-13-x86_64-20250902.cgz/lkp-icl-2sp8/bind-mount/stress-ng/60s

commit: 
  887e97745e ("fs: track the inode having file locks with a flag in ->i_opflags")
  c0aac5975b ("ns: pad refcount")

887e97745ec336c2 c0aac5975bafc86f6817b14e9f7 
---------------- --------------------------- 
         %stddev     %change         %stddev
             \          |                \  
      2345            -3.9%       2254        stress-ng.bind-mount.microsecs_per_mount
      3070            -5.5%       2902        stress-ng.bind-mount.microsecs_per_umount
    704181            +4.9%     739032        stress-ng.bind-mount.ops
     11736            +5.0%      12318        stress-ng.bind-mount.ops_per_sec
     10287            +6.3%      10937 ±  3%  stress-ng.time.involuntary_context_switches
   1810201            +4.6%    1893350        stress-ng.time.voluntary_context_switches
      1.54            +0.1        1.62        mpstat.cpu.all.soft%
    157837            +5.0%     165680        vmstat.system.cs
    179327            +3.9%     186257        vmstat.system.in
 2.772e+09            +3.3%  2.863e+09 ±  2%  perf-stat.i.branch-instructions
  64587234            +2.2%   65980821        perf-stat.i.cache-references
    163281            +5.0%     171502        perf-stat.i.context-switches
 1.305e+10            +3.4%   1.35e+10 ±  2%  perf-stat.i.instructions
      0.45            +2.6%       0.46        perf-stat.i.ipc
      2.48            +5.1%       2.61        perf-stat.i.metric.K/sec
 2.728e+09            +3.3%  2.818e+09 ±  2%  perf-stat.ps.branch-instructions
  63500861            +2.2%   64868461        perf-stat.ps.cache-references
    160406            +5.0%     168462        perf-stat.ps.context-switches
 1.285e+10            +3.4%  1.329e+10 ±  2%  perf-stat.ps.instructions
 7.871e+11            +3.5%  8.143e+11 ±  2%  perf-stat.total.instructions




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