Re: [PATCH v3] mm/slab: take n->list_lock in __slab_try_return_freelist() to avoid race

[kernel test robot <yi1.lai@intel.com>]

Hello,

kernel test robot noticed a 2.3% regression of stress-ng.pagemove.page_remaps_per_sec on:


commit: 710555228bde64392410a9e8959d0324c1a0a598 ("[PATCH v3] mm/slab: take n->list_lock in __slab_try_return_freelist() to avoid race")
url: https://github.com/intel-lab-lkp/linux/commits/Harry-Yoo-Meta/mm-slab-take-n-list_lock-in-__slab_try_return_freelist-to-avoid-race/20260903-153226
patch link: https://lore.kernel.org/all/20260903-slab-fix-aba-v3-1-b44cb6badd54@kernel.org/
patch subject: [PATCH v3] mm/slab: take n->list_lock in __slab_try_return_freelist() to avoid race

testcase: stress-ng
config: x86_64-rhel-9.4
compiler: gcc-14
test machine: 192 threads 2 sockets Intel(R) Xeon(R) 6740E  CPU @ 2.4GHz (Sierra Forest) with 256G memory
parameters:

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

If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <yi1.lai@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202609240534.9fe4984a-lkp@intel.com


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


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20260924/202609240534.9fe4984a-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/igk-srf-2sp3/pagemove/stress-ng/60s

commit: 
  v7.3-rc1
  710555228b ("[PATCH v3] mm/slab: take n->list_lock in __slab_try_return_freelist() to avoid race")

        v7.3-rc1 710555228bde64392410a9e8959
---------------- --------------------------- 
         %stddev     %change         %stddev
             \          |                \  
  74699042            -2.5%   72797565        stress-ng.pagemove.ops
   1245981            -2.5%    1214288        stress-ng.pagemove.ops_per_sec
    291125            -2.3%     284309        stress-ng.pagemove.page_remaps_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.


-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki