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McKenney, similar to b41f5a411f report we just made out. we make this report based on stable data. please educate us if this report is less meaningful. thanks Hello, kernel test robot noticed a 3.4% improvement of stress-ng.memfd.ops_per_sec on: commit: 1ac50ec62874025381a864f784583dbdc30dcc7c ("rcu: Re-implement RCU Tasks Trace in terms of SRCU-fast") https://github.com/paulmckrcu/linux dev.2025.12.16a 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: memfd cpufreq_governor: performance Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260107/202601071316.992a1d32-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-2sp2/memfd/stress-ng/60s commit: 43c23963b3 ("tracing: Guard __DECLARE_TRACE() use of __DO_TRACE_CALL() with SRCU-fast") 1ac50ec628 ("rcu: Re-implement RCU Tasks Trace in terms of SRCU-fast") 43c23963b3c549da 1ac50ec62874025381a864f7845 ---------------- --------------------------- %stddev %change %stddev \ | \ 203232 ± 22% -21.8% 158902 ± 18% numa-meminfo.node1.Mapped 50977 ± 22% -21.8% 39853 ± 18% numa-vmstat.node1.nr_mapped 7039 +1.6% 7152 vmstat.system.cs 107613 -3.9% 103453 stress-ng.memfd.nanosecs_per_memfd_create_call 193537 +3.4% 200175 stress-ng.memfd.ops 3226 +3.4% 3337 stress-ng.memfd.ops_per_sec 187908 +1.6% 190921 stress-ng.time.involuntary_context_switches 99134672 +3.4% 1.025e+08 stress-ng.time.minor_page_faults 61965 ± 3% -6.2% 58116 proc-vmstat.nr_mapped 1.526e+08 +3.4% 1.578e+08 proc-vmstat.numa_hit 1.524e+08 +3.4% 1.576e+08 proc-vmstat.numa_local 1.631e+08 +3.4% 1.687e+08 proc-vmstat.pgalloc_normal 99574028 +3.4% 1.03e+08 proc-vmstat.pgfault 1.624e+08 +3.4% 1.679e+08 proc-vmstat.pgfree 2.26 +1.1% 2.28 perf-stat.i.MPKI 1.646e+10 +1.8% 1.675e+10 perf-stat.i.branch-instructions 0.24 +0.0 0.25 perf-stat.i.branch-miss-rate% 38660390 +6.8% 41301381 perf-stat.i.branch-misses 1.714e+08 +3.1% 1.768e+08 perf-stat.i.cache-misses 2.884e+08 +3.3% 2.979e+08 perf-stat.i.cache-references 6758 +1.3% 6846 perf-stat.i.context-switches 7.88 -2.0% 7.73 perf-stat.i.cpi 3504 -3.1% 3397 perf-stat.i.cycles-between-cache-misses 7.628e+10 +2.0% 7.783e+10 perf-stat.i.instructions 0.13 +2.0% 0.13 perf-stat.i.ipc 17.01 +3.5% 17.59 perf-stat.i.metric.K/sec 1632582 +3.5% 1689088 perf-stat.i.minor-faults 1632582 +3.5% 1689088 perf-stat.i.page-faults 2.25 +1.1% 2.27 perf-stat.overall.MPKI 0.23 +0.0 0.25 perf-stat.overall.branch-miss-rate% 7.91 -2.0% 7.76 perf-stat.overall.cpi 3519 -3.1% 3411 perf-stat.overall.cycles-between-cache-misses 0.13 +2.0% 0.13 perf-stat.overall.ipc 1.619e+10 +1.8% 1.648e+10 perf-stat.ps.branch-instructions 37927942 +6.8% 40525278 perf-stat.ps.branch-misses 1.687e+08 +3.1% 1.74e+08 perf-stat.ps.cache-misses 2.841e+08 +3.3% 2.933e+08 perf-stat.ps.cache-references 6638 +1.4% 6729 perf-stat.ps.context-switches 7.503e+10 +2.0% 7.654e+10 perf-stat.ps.instructions 1606108 +3.5% 1661536 perf-stat.ps.minor-faults 1606108 +3.5% 1661536 perf-stat.ps.page-faults 4.564e+12 +1.8% 4.647e+12 perf-stat.total.instructions 46.05 -0.3 45.79 perf-profile.calltrace.cycles-pp._raw_spin_lock.inode_sb_list_add.new_inode.__shmem_get_inode.__shmem_file_setup 45.93 -0.3 45.68 perf-profile.calltrace.cycles-pp.native_queued_spin_lock_slowpath._raw_spin_lock.inode_sb_list_add.new_inode.__shmem_get_inode 46.36 -0.3 46.10 perf-profile.calltrace.cycles-pp.__shmem_get_inode.__shmem_file_setup.__x64_sys_memfd_create.do_syscall_64.entry_SYSCALL_64_after_hwframe 46.12 -0.3 45.87 perf-profile.calltrace.cycles-pp.inode_sb_list_add.new_inode.__shmem_get_inode.__shmem_file_setup.__x64_sys_memfd_create 46.26 -0.3 46.01 perf-profile.calltrace.cycles-pp.new_inode.__shmem_get_inode.__shmem_file_setup.__x64_sys_memfd_create.do_syscall_64 46.57 -0.2 46.32 perf-profile.calltrace.cycles-pp.__shmem_file_setup.__x64_sys_memfd_create.do_syscall_64.entry_SYSCALL_64_after_hwframe.memfd_create 46.62 -0.2 46.38 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.memfd_create 46.61 -0.2 46.37 perf-profile.calltrace.cycles-pp.__x64_sys_memfd_create.do_syscall_64.entry_SYSCALL_64_after_hwframe.memfd_create 46.64 -0.2 46.40 perf-profile.calltrace.cycles-pp.memfd_create 46.62 -0.2 46.37 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.memfd_create 45.57 -0.2 45.38 perf-profile.calltrace.cycles-pp._raw_spin_lock.evict.__dentry_kill.finish_dput.__fput 45.40 -0.2 45.22 perf-profile.calltrace.cycles-pp.native_queued_spin_lock_slowpath._raw_spin_lock.evict.__dentry_kill.finish_dput 46.69 -0.2 46.53 perf-profile.calltrace.cycles-pp.__fput.task_work_run.exit_to_user_mode_loop.do_syscall_64.entry_SYSCALL_64_after_hwframe 46.61 -0.2 46.45 perf-profile.calltrace.cycles-pp.finish_dput.__fput.task_work_run.exit_to_user_mode_loop.do_syscall_64 46.73 -0.2 46.57 perf-profile.calltrace.cycles-pp.close_range 46.71 -0.2 46.55 perf-profile.calltrace.cycles-pp.exit_to_user_mode_loop.do_syscall_64.entry_SYSCALL_64_after_hwframe.close_range 46.71 -0.2 46.55 perf-profile.calltrace.cycles-pp.task_work_run.exit_to_user_mode_loop.do_syscall_64.entry_SYSCALL_64_after_hwframe.close_range 46.73 -0.2 46.57 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.close_range 46.73 -0.2 46.57 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.close_range 46.60 -0.2 46.45 perf-profile.calltrace.cycles-pp.__dentry_kill.finish_dput.__fput.task_work_run.exit_to_user_mode_loop 46.40 -0.2 46.24 perf-profile.calltrace.cycles-pp.evict.__dentry_kill.finish_dput.__fput.task_work_run 0.59 +0.0 0.60 perf-profile.calltrace.cycles-pp.__x64_sys_munmap.do_syscall_64.entry_SYSCALL_64_after_hwframe.__munmap 0.56 +0.0 0.57 perf-profile.calltrace.cycles-pp.do_vmi_align_munmap.do_vmi_munmap.__vm_munmap.__x64_sys_munmap.do_syscall_64 0.62 +0.0 0.64 perf-profile.calltrace.cycles-pp.__munmap 0.59 +0.0 0.60 perf-profile.calltrace.cycles-pp.__vm_munmap.__x64_sys_munmap.do_syscall_64.entry_SYSCALL_64_after_hwframe.__munmap 0.57 +0.0 0.59 perf-profile.calltrace.cycles-pp.do_vmi_munmap.__vm_munmap.__x64_sys_munmap.do_syscall_64.entry_SYSCALL_64_after_hwframe 0.59 +0.0 0.61 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.__munmap 0.59 +0.0 0.61 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.__munmap 0.98 +0.0 1.01 perf-profile.calltrace.cycles-pp.__handle_mm_fault.handle_mm_fault.do_user_addr_fault.exc_page_fault.asm_exc_page_fault 0.94 +0.0 0.97 perf-profile.calltrace.cycles-pp.do_fault.__handle_mm_fault.handle_mm_fault.do_user_addr_fault.exc_page_fault 0.94 +0.0 0.97 perf-profile.calltrace.cycles-pp.do_shared_fault.do_fault.__handle_mm_fault.handle_mm_fault.do_user_addr_fault 1.01 +0.0 1.04 perf-profile.calltrace.cycles-pp.handle_mm_fault.do_user_addr_fault.exc_page_fault.asm_exc_page_fault.stress_memfd_child 0.83 +0.0 0.86 perf-profile.calltrace.cycles-pp.shmem_get_folio_gfp.shmem_fault.__do_fault.do_shared_fault.do_fault 0.84 +0.0 0.87 perf-profile.calltrace.cycles-pp.shmem_fault.__do_fault.do_shared_fault.do_fault.__handle_mm_fault 0.84 +0.0 0.88 perf-profile.calltrace.cycles-pp.__do_fault.do_shared_fault.do_fault.__handle_mm_fault.handle_mm_fault 1.08 +0.0 1.12 perf-profile.calltrace.cycles-pp.do_user_addr_fault.exc_page_fault.asm_exc_page_fault.stress_memfd_child 1.09 +0.0 1.14 perf-profile.calltrace.cycles-pp.exc_page_fault.asm_exc_page_fault.stress_memfd_child 1.25 +0.1 1.30 perf-profile.calltrace.cycles-pp.asm_exc_page_fault.stress_memfd_child 1.26 +0.1 1.32 perf-profile.calltrace.cycles-pp.stress_memfd_child 0.81 ± 2% +0.1 0.91 ± 2% perf-profile.calltrace.cycles-pp.mmap_region.do_mmap.vm_mmap_pgoff.ksys_mmap_pgoff.do_syscall_64 0.80 ± 3% +0.1 0.90 ± 2% perf-profile.calltrace.cycles-pp.__mmap_region.mmap_region.do_mmap.vm_mmap_pgoff.ksys_mmap_pgoff 0.99 ± 2% +0.1 1.11 perf-profile.calltrace.cycles-pp.do_mmap.vm_mmap_pgoff.ksys_mmap_pgoff.do_syscall_64.entry_SYSCALL_64_after_hwframe 1.00 ± 2% +0.1 1.13 perf-profile.calltrace.cycles-pp.vm_mmap_pgoff.ksys_mmap_pgoff.do_syscall_64.entry_SYSCALL_64_after_hwframe.__mmap 1.03 ± 2% +0.1 1.16 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.__mmap 1.02 ± 2% +0.1 1.15 perf-profile.calltrace.cycles-pp.ksys_mmap_pgoff.do_syscall_64.entry_SYSCALL_64_after_hwframe.__mmap 1.03 ± 2% +0.1 1.16 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.__mmap 1.21 +0.1 1.35 perf-profile.calltrace.cycles-pp.__mmap 92.36 -0.4 91.92 perf-profile.children.cycles-pp._raw_spin_lock 92.52 -0.3 92.17 perf-profile.children.cycles-pp.native_queued_spin_lock_slowpath 46.12 -0.3 45.87 perf-profile.children.cycles-pp.inode_sb_list_add 46.26 -0.3 46.01 perf-profile.children.cycles-pp.new_inode 46.36 -0.3 46.10 perf-profile.children.cycles-pp.__shmem_get_inode 46.57 -0.2 46.32 perf-profile.children.cycles-pp.__shmem_file_setup 46.61 -0.2 46.37 perf-profile.children.cycles-pp.__x64_sys_memfd_create 46.65 -0.2 46.41 perf-profile.children.cycles-pp.memfd_create 47.18 -0.2 47.01 perf-profile.children.cycles-pp.__fput 47.10 -0.2 46.94 perf-profile.children.cycles-pp.finish_dput 46.73 -0.2 46.57 perf-profile.children.cycles-pp.close_range 47.09 -0.2 46.93 perf-profile.children.cycles-pp.__dentry_kill 46.88 -0.2 46.72 perf-profile.children.cycles-pp.evict 46.71 -0.2 46.55 perf-profile.children.cycles-pp.exit_to_user_mode_loop 46.71 -0.2 46.55 perf-profile.children.cycles-pp.task_work_run 97.60 -0.1 97.51 perf-profile.children.cycles-pp.do_syscall_64 97.61 -0.1 97.53 perf-profile.children.cycles-pp.entry_SYSCALL_64_after_hwframe 0.14 +0.0 0.15 perf-profile.children.cycles-pp.xas_create 0.11 +0.0 0.12 perf-profile.children.cycles-pp.__alloc_frozen_pages_noprof 0.11 +0.0 0.12 perf-profile.children.cycles-pp.folio_alloc_mpol_noprof 0.07 +0.0 0.08 perf-profile.children.cycles-pp.mas_rev_awalk 0.12 +0.0 0.13 perf-profile.children.cycles-pp.alloc_pages_mpol 0.12 +0.0 0.13 perf-profile.children.cycles-pp.native_flush_tlb_one_user 0.29 +0.0 0.30 perf-profile.children.cycles-pp.kmem_cache_free 0.09 ± 5% +0.0 0.10 ± 4% perf-profile.children.cycles-pp.xas_expand 0.17 ± 2% +0.0 0.18 ± 2% perf-profile.children.cycles-pp.kmem_cache_alloc_lru_noprof 0.22 +0.0 0.24 ± 2% perf-profile.children.cycles-pp.xas_store 0.13 ± 3% +0.0 0.15 ± 3% perf-profile.children.cycles-pp.flush_tlb_func 0.47 +0.0 0.49 perf-profile.children.cycles-pp.kthread 0.47 +0.0 0.49 perf-profile.children.cycles-pp.ret_from_fork 0.47 +0.0 0.49 perf-profile.children.cycles-pp.ret_from_fork_asm 0.23 +0.0 0.25 perf-profile.children.cycles-pp.shmem_add_to_page_cache 0.12 ± 4% +0.0 0.14 perf-profile.children.cycles-pp.shmem_alloc_folio 0.46 +0.0 0.48 perf-profile.children.cycles-pp.run_ksoftirqd 0.14 ± 3% +0.0 0.16 perf-profile.children.cycles-pp.arch_get_unmapped_area_topdown 0.13 ± 3% +0.0 0.15 perf-profile.children.cycles-pp.vm_unmapped_area 0.15 ± 3% +0.0 0.17 perf-profile.children.cycles-pp.flush_tlb_mm_range 0.08 ± 5% +0.0 0.10 perf-profile.children.cycles-pp.mas_empty_area_rev 0.59 +0.0 0.60 perf-profile.children.cycles-pp.__vm_munmap 0.53 +0.0 0.55 perf-profile.children.cycles-pp.handle_softirqs 0.52 +0.0 0.54 perf-profile.children.cycles-pp.rcu_do_batch 0.56 +0.0 0.57 perf-profile.children.cycles-pp.do_vmi_align_munmap 0.59 +0.0 0.61 perf-profile.children.cycles-pp.__x64_sys_munmap 0.52 +0.0 0.54 perf-profile.children.cycles-pp.rcu_core 0.31 +0.0 0.33 perf-profile.children.cycles-pp.unmap_page_range 0.13 ± 2% +0.0 0.15 perf-profile.children.cycles-pp.unmapped_area_topdown 0.15 ± 2% +0.0 0.17 perf-profile.children.cycles-pp.__get_unmapped_area 0.28 +0.0 0.30 perf-profile.children.cycles-pp.zap_pte_range 0.63 +0.0 0.65 perf-profile.children.cycles-pp.__munmap 0.57 +0.0 0.59 perf-profile.children.cycles-pp.do_vmi_munmap 0.15 ± 2% +0.0 0.17 perf-profile.children.cycles-pp.shmem_get_unmapped_area 0.21 +0.0 0.23 perf-profile.children.cycles-pp.zap_page_range_single 0.36 +0.0 0.38 perf-profile.children.cycles-pp.__mmap_new_vma 0.29 +0.0 0.31 perf-profile.children.cycles-pp.zap_pmd_range 0.19 +0.0 0.22 ± 2% perf-profile.children.cycles-pp.zap_page_range_single_batched 0.23 +0.0 0.26 perf-profile.children.cycles-pp.unmap_mapping_range 0.05 +0.0 0.08 perf-profile.children.cycles-pp.perf_iterate_sb 0.51 +0.0 0.54 perf-profile.children.cycles-pp.shmem_alloc_and_add_folio 0.98 +0.0 1.02 perf-profile.children.cycles-pp.__handle_mm_fault 0.94 +0.0 0.97 perf-profile.children.cycles-pp.do_fault 0.94 +0.0 0.97 perf-profile.children.cycles-pp.do_shared_fault 1.01 +0.0 1.04 perf-profile.children.cycles-pp.handle_mm_fault 0.84 +0.0 0.87 perf-profile.children.cycles-pp.shmem_fault 1.09 +0.0 1.12 perf-profile.children.cycles-pp.do_user_addr_fault 0.84 +0.0 0.88 perf-profile.children.cycles-pp.__do_fault 1.09 +0.0 1.14 perf-profile.children.cycles-pp.exc_page_fault 0.14 ± 3% +0.0 0.18 perf-profile.children.cycles-pp.perf_event_mmap 0.13 ± 3% +0.0 0.17 perf-profile.children.cycles-pp.perf_event_mmap_event 1.02 +0.0 1.06 perf-profile.children.cycles-pp.shmem_get_folio_gfp 0.00 +0.1 0.05 perf-profile.children.cycles-pp.fault_dirty_shared_page 0.00 +0.1 0.05 perf-profile.children.cycles-pp.perf_event_mmap_output 1.40 +0.1 1.46 perf-profile.children.cycles-pp.asm_exc_page_fault 1.53 +0.1 1.60 perf-profile.children.cycles-pp.stress_memfd_child 0.81 ± 2% +0.1 0.91 ± 2% perf-profile.children.cycles-pp.mmap_region 0.80 ± 2% +0.1 0.90 ± 2% perf-profile.children.cycles-pp.__mmap_region 0.99 ± 2% +0.1 1.11 perf-profile.children.cycles-pp.do_mmap 1.00 ± 2% +0.1 1.13 perf-profile.children.cycles-pp.vm_mmap_pgoff 1.02 ± 2% +0.1 1.15 perf-profile.children.cycles-pp.ksys_mmap_pgoff 1.22 +0.1 1.36 perf-profile.children.cycles-pp.__mmap 92.16 -0.4 91.80 perf-profile.self.cycles-pp.native_queued_spin_lock_slowpath 0.05 +0.0 0.06 perf-profile.self.cycles-pp.mas_rev_awalk 0.12 +0.0 0.13 perf-profile.self.cycles-pp.native_flush_tlb_one_user 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