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X-OriginatorOrg: intel.com Hello, kernel test robot noticed a 5.8% improvement of stress-ng.priv-instr.ops_per_sec on: commit: 698a86a85c4db4b800faa8a2890810ff9cec2f79 ("x86/vdso: Implement __vdso_futex_robust_try_unlock()") https://git.kernel.org/cgit/linux/kernel/git/tglx/devel.git locking/futex 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: priv-instr cpufreq_governor: performance we notice the config diff which seems reasonable: --- /pkg/linux/x86_64-rhel-9.4/gcc-14/35b728574c5b70b8223b53787bdbc40e55ca8ac4/.config 2026-05-25 13:01:14.615107724 +0800 +++ /pkg/linux/x86_64-rhel-9.4/gcc-14/698a86a85c4db4b800faa8a2890810ff9cec2f79/.config 2026-05-25 11:39:09.283994568 +0800 @@ -281,6 +281,8 @@ CONFIG_FUTEX=y CONFIG_FUTEX_PI=y CONFIG_FUTEX_PRIVATE_HASH=y CONFIG_FUTEX_MPOL=y +CONFIG_HAVE_FUTEX_ROBUST_UNLOCK=y +CONFIG_FUTEX_ROBUST_UNLOCK=y CONFIG_EPOLL=y CONFIG_SIGNALFD=y CONFIG_TIMERFD=y Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260527/202605271217.16dfca4d-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/priv-instr/stress-ng/60s commit: 35b728574c ("x86/vdso: Prepare for robust futex unlock support") 698a86a85c ("x86/vdso: Implement __vdso_futex_robust_try_unlock()") 35b728574c5b70b8 698a86a85c4db4b800faa8a2890 ---------------- --------------------------- %stddev %change %stddev \ | \ 28468 -5.6% 26878 stress-ng.priv-instr.nanosecs_per_privileged_op_trap 3.983e+08 +5.8% 4.214e+08 stress-ng.priv-instr.ops 6643685 +5.8% 7028732 stress-ng.priv-instr.ops_per_sec 60.10 +0.0% 60.10 stress-ng.time.elapsed_time 60.10 +0.0% 60.10 stress-ng.time.elapsed_time.max 47894 -0.0% 47889 stress-ng.time.involuntary_context_switches 7847 +0.0% 7848 stress-ng.time.maximum_resident_set_size 18927 ± 2% +0.7% 19061 ± 2% stress-ng.time.minor_page_faults 4096 +0.0% 4096 stress-ng.time.page_size 19086 +0.0% 19087 stress-ng.time.percent_of_cpu_this_job_got 11320 -0.1% 11312 stress-ng.time.system_time 150.74 +5.9% 159.68 stress-ng.time.user_time 671.60 +1.0% 678.17 ± 3% stress-ng.time.voluntary_context_switches 0.00 +3e+102% 3.00 ±107% perf-c2c.DRAM.local 0.00 +8.5e+103% 85.33 ±111% perf-c2c.DRAM.remote 0.00 +6.6e+104% 660.17 ±100% perf-c2c.HITM.local 0.00 +8.2e+103% 81.83 ±110% perf-c2c.HITM.remote 0.00 +7.4e+104% 742.00 ±101% perf-c2c.HITM.total 247011 ± 28% -8.9% 225103 ± 35% numa-numastat.node0.local_node 373383 ± 15% -1.0% 369611 ± 13% numa-numastat.node0.numa_hit 126371 ± 47% +14.4% 144508 ± 30% numa-numastat.node0.other_node 367783 ± 18% +5.5% 387890 ± 20% numa-numastat.node1.local_node 440260 ± 12% +0.5% 442288 ± 11% numa-numastat.node1.numa_hit 72476 ± 81% -24.9% 54397 ± 80% numa-numastat.node1.other_node 3.27 -0.0 3.26 mpstat.cpu.all.idle% 0.09 +0.0 0.09 ± 3% mpstat.cpu.all.irq% 0.00 ± 52% +0.0 0.00 ± 31% mpstat.cpu.all.soft% 95.15 -0.1 95.08 mpstat.cpu.all.sys% 1.49 +0.1 1.56 mpstat.cpu.all.usr% 3.00 +0.0% 3.00 mpstat.max_utilization.seconds 100.00 +0.0% 100.00 mpstat.max_utilization_pct 60.10 +0.0% 60.10 time.elapsed_time 60.10 +0.0% 60.10 time.elapsed_time.max 47894 -0.0% 47889 time.involuntary_context_switches 7847 +0.0% 7848 time.maximum_resident_set_size 18927 ± 2% +0.7% 19061 ± 2% time.minor_page_faults 4096 +0.0% 4096 time.page_size 19086 +0.0% 19087 time.percent_of_cpu_this_job_got 11320 -0.1% 11312 time.system_time 150.74 +5.9% 159.68 time.user_time 671.60 +1.0% 678.17 ± 3% time.voluntary_context_switches 6.08 ± 9% -7.8% 5.61 ± 13% vmstat.cpu.id 92.50 +0.5% 92.93 vmstat.cpu.sy 1.42 +2.0% 1.45 ± 2% vmstat.cpu.us 0.33 +0.5% 0.33 vmstat.io.bi 4.00 +0.0% 4.00 vmstat.memory.buff 4549331 -0.0% 4547648 vmstat.memory.cache 2.514e+08 -0.0% 2.514e+08 vmstat.memory.free 181.12 +0.9% 182.71 vmstat.procs.r 2505 ± 2% -3.0% 2430 ± 2% vmstat.system.cs 443254 +0.4% 445179 vmstat.system.in 0.07 ± 5% -3.7% 0.07 ± 4% perf-sched.sch_delay.avg.ms.[unknown].[unknown].[unknown].[unknown].[unknown] 10.80 ± 42% -6.8% 10.06 ± 38% perf-sched.sch_delay.max.ms.[unknown].[unknown].[unknown].[unknown].[unknown] 0.07 ± 5% -3.7% 0.07 ± 4% perf-sched.total_sch_delay.average.ms 10.80 ± 42% -6.8% 10.06 ± 38% perf-sched.total_sch_delay.max.ms 176.52 ± 2% -0.6% 175.50 ± 5% perf-sched.total_wait_and_delay.average.ms 7255 ± 2% +1.9% 7392 ± 6% perf-sched.total_wait_and_delay.count.ms 4979 +0.0% 4981 perf-sched.total_wait_and_delay.max.ms 176.45 ± 2% -0.6% 175.43 ± 5% perf-sched.total_wait_time.average.ms 4979 +0.0% 4981 perf-sched.total_wait_time.max.ms 176.52 ± 2% -0.6% 175.50 ± 5% perf-sched.wait_and_delay.avg.ms.[unknown].[unknown].[unknown].[unknown].[unknown] 7255 ± 2% +1.9% 7392 ± 6% perf-sched.wait_and_delay.count.[unknown].[unknown].[unknown].[unknown].[unknown] 4979 +0.0% 4981 perf-sched.wait_and_delay.max.ms.[unknown].[unknown].[unknown].[unknown].[unknown] 176.45 ± 2% -0.6% 175.43 ± 5% perf-sched.wait_time.avg.ms.[unknown].[unknown].[unknown].[unknown].[unknown] 4979 +0.0% 4981 perf-sched.wait_time.max.ms.[unknown].[unknown].[unknown].[unknown].[unknown] 2004 -0.3% 1999 perf-stat.i.context-switches 192058 -0.0% 192055 perf-stat.i.cpu-clock 311.00 -0.7% 308.78 perf-stat.i.cpu-migrations 0.02 ± 99% +23.7% 0.02 ± 93% perf-stat.i.major-faults 3937 ± 3% +2.8% 4049 ± 4% perf-stat.i.minor-faults 3937 ± 3% +2.8% 4049 ± 4% perf-stat.i.page-faults 192058 -0.0% 192055 perf-stat.i.task-clock 1972 -0.2% 1968 perf-stat.ps.context-switches 188859 -0.0% 188847 perf-stat.ps.cpu-clock 305.80 -0.7% 303.61 perf-stat.ps.cpu-migrations 0.02 ± 96% +25.7% 0.02 ± 92% perf-stat.ps.major-faults 3872 ± 3% +2.8% 3979 ± 4% perf-stat.ps.minor-faults 3872 ± 3% +2.8% 3979 ± 4% perf-stat.ps.page-faults 188859 -0.0% 188847 perf-stat.ps.task-clock 1852 ± 81% +66.9% 3093 turbostat.Avg_MHz 57.87 ± 81% +38.8 96.62 turbostat.Busy% 1920 ± 81% +66.7% 3201 turbostat.Bzy_MHz 1.99 ± 82% +1.2 3.15 ± 5% turbostat.C1% 1.99 ± 82% +58.0% 3.14 ± 5% turbostat.CPU%c1 30.20 ± 81% +68.3% 50.83 turbostat.CoreTmp 0.03 ± 81% +66.7% 0.05 turbostat.IPC 16893263 ± 81% +66.7% 28163412 turbostat.IRQ 4937639 ± 81% +66.8% 8234664 turbostat.NMI 30.60 ± 81% +66.1% 50.83 turbostat.PkgTmp 171.65 ± 81% +67.0% 286.58 turbostat.PkgWatt 9.03 ± 81% +66.6% 15.05 turbostat.RAMWatt 0.01 ± 81% +66.7% 0.02 turbostat.SysWatt 1440 ± 81% +66.7% 2400 turbostat.TSC_MHz 1584 ± 6% -8.7% 1447 sched_debug.cfs_rq:/.runnable_avg.max 162.28 ± 5% -8.7% 148.14 ± 4% sched_debug.cfs_rq:/.runnable_avg.stddev 1025 ± 4% +7.6% 1103 ± 4% sched_debug.cfs_rq:/.util_avg.max 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