[linus:master] [rcu] ec5ee5417b: stress-ng.ramfs.ops_per_sec 25.7% improvement

[linus:master] [rcu] ec5ee5417b: stress-ng.ramfs.ops_per_sec 25.7% improvement

[kernel test robot]

Hello,

kernel test robot noticed a 25.7% improvement of stress-ng.ramfs.ops_per_sec on:


commit: ec5ee5417b00278fa050b38d878b76f1365420fb ("rcu: Advance callbacks for expedited GP completion in rcu_core()") 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: 256 threads 2 sockets Intel(R) Xeon(R) 6768P  CPU @ 2.4GHz (Granite Rapids) with 64G memory
parameters:

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


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


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20260924/202609241934.228b4a14-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-gnr-2sp4/ramfs/stress-ng/60s

commit: 
  fde2b18817 ("rcu: Detect expedited grace period completion in rcu_pending()")
  ec5ee5417b ("rcu: Advance callbacks for expedited GP completion in rcu_core()")

fde2b18817e4f32b ec5ee5417b00278fa050b38d878
---------------- --------------------------- 
         %stddev     %change         %stddev
             \          |                \  
    427110           +25.7%     537009        stress-ng.ramfs.ops
      7124           +25.7%       8957        stress-ng.ramfs.ops_per_sec
      6004 ±  2%    +561.7%      39731        stress-ng.time.involuntary_context_switches
    685.50            -5.1%     650.33        stress-ng.time.percent_of_cpu_this_job_got
    405.23            -5.4%     383.53        stress-ng.time.system_time
    776758           +19.9%     931227        stress-ng.time.voluntary_context_switches


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