[linus:master] [nsfs] 82e9343260: stress-ng.usersyscall.ops_per_sec 12.4% improvement

[linus:master] [nsfs] 82e9343260: stress-ng.usersyscall.ops_per_sec 12.4% improvement

[kernel test robot]

Hello,

kernel test robot noticed a 12.4% improvement of stress-ng.usersyscall.ops_per_sec on:


commit: 82e9343260dfc6dda6349f285d9a5eac3e0738d7 ("nsfs: keep namespace tree fields stable until after RCU grace period") 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: 224 threads 2 sockets Intel(R) Xeon(R) (Sapphire Rapids) with 128G memory
parameters:

  nr_threads: 100%
  testtime: 60s
  test: usersyscall
  cpufreq_governor: performance


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


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20261014/202610140836.4d5baee2-lkp@intel.com

=========================================================================================
compiler/cpufreq_governor/kconfig/nr_threads/rootfs/tbox_group/test/testcase/testtime:
  gcc-14/performance/x86_64-rhel-9.4/100%/debian-13-x86_64-20250902.cgz/lkp-spr-2sp2/usersyscall/stress-ng/60s

commit: 
  0ecd56573c ("ext4: Avoid entering writeback paths during fastcommit replay")
  82e9343260 ("nsfs: keep namespace tree fields stable until after RCU grace period")

0ecd56573c1f272c 82e9343260dfc6dda6349f285d9
---------------- --------------------------- 
         %stddev     %change         %stddev
             \          |                \  
     33817           -10.8%      30152        stress-ng.usersyscall.nanosecs_per_syscall
 1.908e+08           +12.4%  2.144e+08        stress-ng.usersyscall.ops
   3187687           +12.4%    3582876        stress-ng.usersyscall.ops_per_sec


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