[linus:master] [workqueue] f1639cde5f: stress-ng.io.ops_per_sec 9.9% improvement

[linus:master] [workqueue] f1639cde5f: stress-ng.io.ops_per_sec 9.9% improvement

[kernel test robot]

Hello,

kernel test robot noticed a 9.9% improvement of stress-ng.io.ops_per_sec on:


commit: f1639cde5f5c1bee25498ef988227ee8cf5ddb04 ("workqueue: Make flush_workqueue() visit only pwqs active since the last flush") 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%
	disk: 1SSD
	testtime: 60s
	fs: xfs
	test: io
	cpufreq_governor: performance


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


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20261110/202611100656.fcd6dc19-lkp@intel.com

=========================================================================================
compiler/cpufreq_governor/disk/fs/kconfig/nr_threads/rootfs/tbox_group/test/testcase/testtime:
  gcc-14/performance/1SSD/xfs/x86_64-rhel-9.4/100%/debian-13-x86_64-20250902.cgz/lkp-spr-2sp3/io/stress-ng/60s

commit: 
  31e33de1f4 ("workqueue: Maintain pwq->total_in_flight")
  f1639cde5f ("workqueue: Make flush_workqueue() visit only pwqs active since the last flush")

31e33de1f4e159c7 f1639cde5f5c1bee25498ef9882
---------------- --------------------------- 
         %stddev     %change         %stddev
             \          |                \  
    260170 ±  3%      +9.9%     285895 ±  4%  stress-ng.io.ops
      4337 ±  3%      +9.9%       4766 ±  4%  stress-ng.io.ops_per_sec
   6244092 ±  3%      +9.9%    6861492 ±  4%  stress-ng.time.file_system_outputs
      4547 ±  7%     -15.8%       3826 ±  4%  stress-ng.time.involuntary_context_switches
      3320 ±  3%     -17.5%       2739 ±  5%  stress-ng.time.percent_of_cpu_this_job_got
      1995 ±  3%     -17.5%       1645 ±  5%  stress-ng.time.system_time


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