Greeting,

FYI, we noticed a 18.8% improvement of stress-ng.sigq.ops_per_sec due to commit:


commit: 53c72b590b3a0afd6747d6f7957e6838003e90a4 ("rcu/tree: cache specified number of objects")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master


in testcase: stress-ng
on test machine: 96 threads Intel(R) Xeon(R) Gold 6252 CPU @ 2.10GHz with 256G memory
with following parameters:

	nr_threads: 100%
	disk: 1HDD
	testtime: 30s
	class: interrupt
	cpufreq_governor: performance
	ucode: 0x5002f01






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


To reproduce:

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     job.yaml

=========================================================================================
class/compiler/cpufreq_governor/disk/kconfig/nr_threads/rootfs/tbox_group/testcase/testtime/ucode:
  interrupt/gcc-9/performance/1HDD/x86_64-rhel-8.3/100%/debian-10.4-x86_64-20200603.cgz/lkp-csl-2sp7/stress-ng/30s/0x5002f01

commit: 
  69f08d3999 ("rcu/tree: Use static initializer for krc.lock")
  53c72b590b ("rcu/tree: cache specified number of objects")

69f08d3999dbef15 53c72b590b3a0afd6747d6f7957 
---------------- --------------------------- 
         %stddev     %change         %stddev
             \          |                \  
 2.315e+08           +18.8%  2.749e+08        stress-ng.sigq.ops
   7716291           +18.8%    9164111        stress-ng.sigq.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.


Thanks,
Rong Chen