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X-OriginatorOrg: intel.com Hello, kernel test robot noticed a 91.5% improvement of stress-ng.session.ops_per_sec on: commit: b8fea7af0e40feb6d9cbbd60b66ff0ec265e868f ("sched/fair: Allocate cfs_tg_state with percpu allocator") 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: 192 threads 2 sockets Intel(R) Xeon(R) 6740E CPU @ 2.4GHz (Sierra Forest) with 256G memory parameters: nr_threads: 100% testtime: 60s test: session cpufreq_governor: performance Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260626/202606261633.32eca12c-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-2sp3/session/stress-ng/60s commit: 89e1f67186 ("sched/fair: Remove task_group->se pointer array") b8fea7af0e ("sched/fair: Allocate cfs_tg_state with percpu allocator") 89e1f67186baca35 b8fea7af0e40feb6d9cbbd60b66 ---------------- --------------------------- %stddev %change %stddev \ | \ 610356 +91.5% 1168547 ± 2% stress-ng.session.ops 10187 +91.5% 19511 ± 2% stress-ng.session.ops_per_sec 682208 +23.9% 845283 ± 2% stress-ng.time.involuntary_context_switches 9315 ± 36% +196.0% 27570 ± 46% stress-ng.time.major_page_faults 74894407 ± 3% +91.4% 1.433e+08 ± 4% stress-ng.time.minor_page_faults 13490 -2.5% 13152 stress-ng.time.percent_of_cpu_this_job_got 8076 -3.1% 7829 stress-ng.time.system_time 33.20 ± 2% +130.4% 76.48 ± 3% stress-ng.time.user_time 3019455 +147.5% 7471743 ± 2% stress-ng.time.voluntary_context_switches 2.619e+09 ± 6% +41.1% 3.697e+09 ± 3% cpuidle..time 4789881 +106.5% 9891495 ± 2% cpuidle..usage 22.08 ± 4% +44.9% 31.98 ± 3% vmstat.cpu.id 4955056 +9.8% 5439814 vmstat.memory.cache 169.44 ± 2% -13.4% 146.67 ± 2% vmstat.procs.r 124532 +120.7% 274835 ± 2% vmstat.system.cs 455602 +21.4% 553218 vmstat.system.in 19.73 ± 5% +10.0 29.75 ± 4% mpstat.cpu.all.idle% 0.03 ± 8% -0.0 0.00 ± 81% mpstat.cpu.all.iowait% 0.37 +0.2 0.56 ± 3% mpstat.cpu.all.irq% 11.52 -9.3 2.22 ± 2% mpstat.cpu.all.soft% 0.89 +0.3 1.16 mpstat.cpu.all.usr% 87.80 -6.3% 82.23 mpstat.max_utilization_pct 23158413 ± 2% +91.2% 44277233 ± 3% numa-numastat.node0.local_node 23346017 ± 2% +95.5% 45639044 ± 3% numa-numastat.node0.numa_hit 187646 ± 17% +625.7% 1361768 ± 6% numa-numastat.node0.other_node 21382055 ± 2% +87.6% 40123301 ± 6% numa-numastat.node1.local_node 21639867 ± 2% +92.2% 41600375 ± 6% numa-numastat.node1.numa_hit 257307 ± 11% +474.1% 1477073 ± 6% numa-numastat.node1.other_node 2540 -12.4% 2225 turbostat.Avg_MHz 79.44 -9.9 69.53 turbostat.Busy% 22.02 ± 5% +9.2 31.19 ± 3% turbostat.C1% 20.36 ± 5% +48.8% 30.30 ± 3% turbostat.CPU%c1 0.15 +60.0% 0.24 turbostat.IPC 30697679 +24.4% 38174002 turbostat.IRQ 313.32 +2.6% 321.34 turbostat.PkgWatt 24.18 +18.1% 28.56 turbostat.RAMWatt 1537143 +32.6% 2038945 meminfo.Active 1537110 +32.6% 2038912 meminfo.Active(anon) 4808401 +9.8% 5281769 meminfo.Cached 5073192 +8.4% 5498934 meminfo.Committed_AS 391992 -15.3% 332050 meminfo.Mapped 93966 ± 4% +21.0% 113702 ± 5% meminfo.PageTables 172086 ± 7% +325.6% 732317 meminfo.Percpu 1095287 -56.6% 475325 meminfo.SUnreclaim 716648 +66.1% 1190009 meminfo.Shmem 1237725 -50.0% 618879 meminfo.Slab 0.23 -66.5% 0.08 perf-sched.sch_delay.avg.ms.[unknown].[unknown].[unknown].[unknown].[unknown] 56.29 ± 20% -37.3% 35.30 ± 13% perf-sched.sch_delay.max.ms.[unknown].[unknown].[unknown].[unknown].[unknown] 0.23 -66.5% 0.08 perf-sched.total_sch_delay.average.ms 56.29 ± 20% -37.3% 35.30 ± 13% perf-sched.total_sch_delay.max.ms 9.88 -51.7% 4.78 perf-sched.total_wait_and_delay.average.ms 399971 +106.1% 824497 perf-sched.total_wait_and_delay.count.ms 9.65 -51.3% 4.70 perf-sched.total_wait_time.average.ms 9.88 -51.7% 4.78 perf-sched.wait_and_delay.avg.ms.[unknown].[unknown].[unknown].[unknown].[unknown] 399971 +106.1% 824497 perf-sched.wait_and_delay.count.[unknown].[unknown].[unknown].[unknown].[unknown] 9.65 -51.3% 4.70 perf-sched.wait_time.avg.ms.[unknown].[unknown].[unknown].[unknown].[unknown] 133243 +116.4% 288278 ± 3% perf-stat.i.context-switches 194336 -1.1% 192149 perf-stat.i.cpu-clock 27884 +91.6% 53428 ± 3% perf-stat.i.cpu-migrations 158.09 ± 37% +185.5% 451.31 ± 46% perf-stat.i.major-faults 1256057 ± 3% +88.1% 2362437 ± 4% perf-stat.i.minor-faults 1256215 ± 3% +88.1% 2362888 ± 4% perf-stat.i.page-faults 194336 -1.1% 192149 perf-stat.i.task-clock 128658 +118.2% 280754 ± 3% perf-stat.ps.context-switches 26831 +93.3% 51879 ± 3% perf-stat.ps.cpu-migrations 150.27 ± 37% +193.4% 440.89 ± 46% perf-stat.ps.major-faults 1212558 ± 3% +89.3% 2295418 ± 3% perf-stat.ps.minor-faults 1212708 ± 3% +89.3% 2295859 ± 3% perf-stat.ps.page-faults 167364 ± 66% +787.8% 1485853 ± 18% numa-meminfo.node0.Active 167345 ± 66% +787.9% 1485838 ± 18% numa-meminfo.node0.Active(anon) 49987 ± 92% +324.2% 212032 ± 19% numa-meminfo.node0.Mapped 619973 ± 6% -58.1% 259551 ± 26% numa-meminfo.node0.SUnreclaim 29716 ± 78% +3008.8% 923832 ± 4% numa-meminfo.node0.Shmem 705775 ± 7% -54.1% 323802 ± 30% numa-meminfo.node0.Slab 1370362 ± 8% -59.5% 555194 ± 51% numa-meminfo.node1.Active 1370348 ± 8% -59.5% 555175 ± 51% numa-meminfo.node1.Active(anon) 362187 ± 10% -74.2% 93542 ±159% numa-meminfo.node1.AnonHugePages 341339 ± 12% -64.6% 120912 ± 35% numa-meminfo.node1.Mapped 45901 ± 16% +23.8% 56827 ± 4% numa-meminfo.node1.PageTables 476900 ± 10% -54.7% 215830 ± 31% numa-meminfo.node1.SUnreclaim 686948 ± 3% -61.1% 267149 ± 15% numa-meminfo.node1.Shmem 533533 ± 10% -44.7% 295138 ± 33% numa-meminfo.node1.Slab 383948 +32.8% 509815 proc-vmstat.nr_active_anon 206513 +3.4% 213464 proc-vmstat.nr_anon_pages 1201861 +9.9% 1320471 proc-vmstat.nr_file_pages 97614 ± 2% -14.9% 83031 proc-vmstat.nr_mapped 23581 ± 3% +20.7% 28463 ± 4% proc-vmstat.nr_page_table_pages 178922 +66.3% 297531 proc-vmstat.nr_shmem 274192 -56.7% 118831 proc-vmstat.nr_slab_unreclaimable 80759 +3.2% 83318 proc-vmstat.nr_vmalloc 383948 +32.8% 509815 proc-vmstat.nr_zone_active_anon 44989050 ± 2% +93.9% 87242239 ± 2% proc-vmstat.numa_hit 44543635 ± 2% +89.5% 84403353 ± 2% proc-vmstat.numa_local 444953 ± 3% +538.0% 2838842 proc-vmstat.numa_other 48904767 ± 2% +85.6% 90766237 ± 2% proc-vmstat.pgalloc_normal 75424210 ± 3% +90.8% 1.439e+08 ± 4% proc-vmstat.pgfault 48116497 ± 2% +86.5% 89739194 ± 2% proc-vmstat.pgfree 4261223 ± 10% +96.1% 8358094 ± 6% proc-vmstat.pgreuse 41819 ± 66% +788.2% 371430 ± 18% numa-vmstat.node0.nr_active_anon 12503 ± 92% +324.2% 53034 ± 19% numa-vmstat.node0.nr_mapped 7429 ± 78% +3008.7% 230968 ± 4% numa-vmstat.node0.nr_shmem 155024 ± 6% -58.1% 64888 ± 26% numa-vmstat.node0.nr_slab_unreclaimable 41818 ± 66% +788.2% 371428 ± 18% numa-vmstat.node0.nr_zone_active_anon 23345970 ± 2% +95.5% 45639379 ± 3% numa-vmstat.node0.numa_hit 23158366 ± 2% +91.2% 44277567 ± 3% numa-vmstat.node0.numa_local 187646 ± 17% +625.7% 1361768 ± 6% numa-vmstat.node0.numa_other 342699 ± 8% -59.5% 138864 ± 51% numa-vmstat.node1.nr_active_anon 176.85 ± 10% -74.2% 45.68 ±159% numa-vmstat.node1.nr_anon_transparent_hugepages 85411 ± 12% -64.6% 30246 ± 35% numa-vmstat.node1.nr_mapped 11500 ± 16% +23.8% 14240 ± 4% numa-vmstat.node1.nr_page_table_pages 171755 ± 3% -61.1% 66798 ± 15% numa-vmstat.node1.nr_shmem 119206 ± 10% -54.7% 53962 ± 31% numa-vmstat.node1.nr_slab_unreclaimable 342698 ± 8% -59.5% 138863 ± 51% numa-vmstat.node1.nr_zone_active_anon 21639864 ± 2% +92.2% 41600300 ± 6% numa-vmstat.node1.numa_hit 21382052 ± 2% +87.6% 40123226 ± 6% numa-vmstat.node1.numa_local 257307 ± 11% +474.1% 1477073 ± 6% numa-vmstat.node1.numa_other 0.50 ± 10% -16.4% 0.42 ± 8% sched_debug.cfs_rq:/.h_nr_queued.avg 0.49 ± 11% -15.5% 0.41 ± 8% sched_debug.cfs_rq:/.h_nr_runnable.avg 32477 ± 11% -20.0% 25967 ± 15% sched_debug.cfs_rq:/.left_deadline.max 32462 ± 11% -20.1% 25950 ± 15% sched_debug.cfs_rq:/.left_vruntime.max 495516 ± 11% -18.3% 404915 ± 9% sched_debug.cfs_rq:/.load.avg 1675 ± 12% -22.9% 1291 ± 24% sched_debug.cfs_rq:/.load_avg.avg 17.83 ± 37% +73.3% 30.90 ± 29% sched_debug.cfs_rq:/.load_avg.min 0.50 ± 10% -16.5% 0.42 ± 8% sched_debug.cfs_rq:/.nr_queued.avg 32462 ± 11% -20.1% 25950 ± 15% sched_debug.cfs_rq:/.right_vruntime.max 8.253e+11 ± 46% -68.5% 2.6e+11 ± 44% sched_debug.cfs_rq:/.sum_w_vruntime.max -1.142e+12 -79.2% -2.372e+11 sched_debug.cfs_rq:/.sum_w_vruntime.min 1.641e+11 ± 14% -80.5% 3.196e+10 ± 30% sched_debug.cfs_rq:/.sum_w_vruntime.stddev 562.81 ± 4% -6.3% 527.61 ± 6% sched_debug.cpu.clock_task.stddev 408623 ± 13% +44.3% 589658 ± 7% sched_debug.cpu.curr->pid.avg 609584 +90.0% 1157918 ± 2% sched_debug.cpu.curr->pid.max 278101 ± 6% +106.4% 574007 ± 2% sched_debug.cpu.curr->pid.stddev 0.50 ± 10% -16.5% 0.42 ± 8% sched_debug.cpu.nr_running.avg 22206 +111.3% 46925 ± 3% sched_debug.cpu.nr_switches.avg 59463 ± 30% +66.6% 99041 ± 11% sched_debug.cpu.nr_switches.max 16171 ± 11% +62.8% 26329 ± 21% sched_debug.cpu.nr_switches.min -115.25 +180.9% -323.70 sched_debug.cpu.nr_uninterruptible.min 47.53 ± 13% +134.1% 111.26 ± 21% sched_debug.cpu.nr_uninterruptible.stddev 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