[linus:master] [libfs] 02a336a831: stress-ng.clock.ops_per_sec 147.7% improvement

[linus:master] [libfs] 02a336a831: stress-ng.clock.ops_per_sec 147.7% improvement

[kernel test robot]

Hello,

kernel test robot noticed a 147.7% improvement of stress-ng.clock.ops_per_sec on:


commit: 02a336a831f02a18047bacbd49018a237af8a172 ("libfs: hold one mount reference for all pins") 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 4 sockets INTEL(R) XEON(R) PLATINUM 8592+ (Emerald Rapids) with 256G memory
parameters:

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


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


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20261109/202611090811.f9303f5a-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-emr-2sp1/clock/stress-ng/60s

commit: 
  eeecea75ec ("proc: don't let an entry below /proc/<pid>/net be a mountpoint")
  02a336a831 ("libfs: hold one mount reference for all pins")

eeecea75ece2ba89 02a336a831f02a18047bacbd490
---------------- --------------------------- 
         %stddev     %change         %stddev
             \          |                \  
   4669272          +147.6%   11562917        stress-ng.clock.ops
     77848          +147.7%     192799        stress-ng.clock.ops_per_sec
    126459           +80.5%     228294 ± 13%  stress-ng.time.involuntary_context_switches
     32287 ±  2%      -7.1%      30008 ±  3%  stress-ng.time.minor_page_faults
     23175            +4.0%      24092        stress-ng.time.percent_of_cpu_this_job_got
     13907            +3.7%      14423        stress-ng.time.system_time
     16.08          +213.4%      50.38        stress-ng.time.user_time
   2056711 ±  4%     +36.4%    2804386 ±  8%  stress-ng.time.voluntary_context_switches
      9325            -6.2%       8744        uptime.idle


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