[linus:master] [sched/cache] 28f9c0e0a0: stress-ng.fd-race.ops_per_sec 5.2% improvement

[linus:master] [sched/cache] 28f9c0e0a0: stress-ng.fd-race.ops_per_sec 5.2% improvement

[kernel test robot]

Hello,

kernel test robot noticed a 5.2% improvement of stress-ng.fd-race.ops_per_sec on:

commit: 28f9c0e0a0b94c5d3e1b634db545f6e1f94858c5 ("sched/cache: Decouple sched_cache_group from mm to fix UAF") 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 2 sockets GENUINE INTEL(R) XEON(R) (Sierra Forest) with 128G memory
parameters:

	nr_threads: 100%
	testtime: 60s
	test: fd-race
	cpufreq_governor: performance

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

The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20261009/202610091149.c00cf9f2-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-srf-2sp1/fd-race/stress-ng/60s

commit: 
  d6013e2465 ("sched/cache: Honor migrate_llc_task semantics in active load balance, to fix LLC mis-scheduling bug")
  28f9c0e0a0 ("sched/cache: Decouple sched_cache_group from mm to fix UAF")

d6013e2465d98d52 28f9c0e0a0b94c5d3e1b634db54
---------------- --------------------------- 
         %stddev     %change         %stddev
             \          |                \  
  28370042            +5.2%   29834431        stress-ng.fd-race.ops
    473267            +5.2%     497702        stress-ng.fd-race.ops_per_sec
    843367           +27.1%    1072325        stress-ng.time.voluntary_context_switches
     62132            +7.1%      66565 ±  4%  meminfo.PageTables
  48712422 ±  4%      +8.4%   52824690 ±  2%  cpuidle.C1E.time
  62293414 ±  2%      +9.0%   67917882 ±  3%  cpuidle.C6S.time
     68069 ±  2%      +9.6%      74599 ±  3%  cpuidle.C6S.usage


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