[linus:master] [mm] 8d596d8b81: stress-ng.mlockmany.ops_per_sec 10.5% improvement

[kernel test robot]

Hello,

kernel test robot noticed a 10.5% improvement of stress-ng.mlockmany.ops_per_sec on:


commit: 8d596d8b81ef56bf61538d6b4761a7b0d6138280 ("mm: avoid unnecessary lru drain for wp_can_reuse_anon_folio()") 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: mlockmany
	cpufreq_governor: performance


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


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20261019/202610190949.71c20bb5-lkp@xxxxxxxxx

=========================================================================================
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/mlockmany/stress-ng/60s

commit: 
  819bfbd47e ("mm/page_alloc: remove set_page_private() in prep_compound_tail()")
  8d596d8b81 ("mm: avoid unnecessary lru drain for wp_can_reuse_anon_folio()")

819bfbd47e49df89 8d596d8b81ef56bf61538d6b476
---------------- --------------------------- 
         %stddev     %change         %stddev
             \          |                \  
   1050118           +10.6%    1161061 ±  2%  stress-ng.mlockmany.ops
     17541           +10.5%      19384 ±  2%  stress-ng.mlockmany.ops_per_sec
   2933233            -7.5%    2714192        stress-ng.time.involuntary_context_switches
     76.26           +29.3%      98.61 ±  3%  stress-ng.time.user_time
   2425877            +9.4%    2654908 ±  2%  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