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Fri, 19 Dec 2025 06:22:12 +0000 Date: Fri, 19 Dec 2025 14:21:49 +0800 From: kernel test robot To: Lorenzo Stoakes CC: , , , Andrew Morton , Jason Gunthorpe , Alexander Gordeev , Al Viro , Andreas Larsson , "Andrey Konovalov" , Arnd Bergmann , Baolin Wang , Baoquan He , "Chatre, Reinette" , Christian Borntraeger , Christian Brauner , "Dan Williams" , Dave Jiang , "Dave Martin" , Dave Young , "David Hildenbrand" , "David S. 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LV3PR11MB8603.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Dec 2025 06:22:12.1212 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: swR1ZfE75OU+kC7mgsTom4XUA6OLCKTBIDXZj/RecMttqAoGlG6Jns5NAR0a1TQJ0efkuaeWPM8BuiWpLV+vig== X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR11MB6516 X-OriginatorOrg: intel.com Hello, kernel test robot noticed a 3.4% improvement of stress-ng.fd-abuse.ops_per_sec on: commit: ab04945f91bcad1668af57bbb575771e794aea8d ("mm: update mem char driver to use mmap_prepare") 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 4 sockets INTEL(R) XEON(R) PLATINUM 8592+ (Emerald Rapids) with 256G memory parameters: nr_threads: 100% testtime: 60s test: fd-abuse cpufreq_governor: performance Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20251218/202512181616.16b76cde-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-emr-2sp1/fd-abuse/stress-ng/60s commit: 89646d9c74 ("mm: add shmem_zero_setup_desc()") ab04945f91 ("mm: update mem char driver to use mmap_prepare") 89646d9c748c0902 ab04945f91bcad1668af57bbb57 ---------------- --------------------------- %stddev %change %stddev \ | \ 19.28 +2.8% 19.82 turbostat.RAMWatt 2438603 ± 3% -13.5% 2109471 ± 7% numa-numastat.node1.local_node 2517328 ± 4% -11.9% 2217162 ± 5% numa-numastat.node1.numa_hit 72858 ± 6% +91.5% 139519 ± 3% proc-vmstat.nr_slab_reclaimable 339884 +107.0% 703398 proc-vmstat.nr_slab_unreclaimable 20261925 ± 2% -25.3% 15142663 proc-vmstat.pgalloc_normal 18968240 ± 2% -31.6% 12978914 ± 2% proc-vmstat.pgfree 3.706e+09 +3.4% 3.833e+09 stress-ng.fd-abuse.ops 61777966 +3.4% 63895149 stress-ng.fd-abuse.ops_per_sec 285.34 +4.4% 297.95 stress-ng.time.user_time 16701 +2.7% 17144 stress-ng.time.voluntary_context_switches 8804549 +61.4% 14208934 meminfo.Committed_AS 291574 ± 6% +91.1% 557114 ± 3% meminfo.KReclaimable 12991379 ± 3% +16.6% 15149678 ± 2% meminfo.Memused 291574 ± 6% +91.1% 557114 ± 3% meminfo.SReclaimable 1353499 +107.7% 2811130 meminfo.SUnreclaim 1645073 +104.7% 3368244 meminfo.Slab 13335448 ± 3% +15.9% 15450436 ± 2% meminfo.max_used_kB 17516 ± 34% +97.4% 34572 ± 6% numa-vmstat.node0.nr_slab_reclaimable 88462 ± 6% +102.5% 179171 ± 2% numa-vmstat.node0.nr_slab_unreclaimable 66.79 ± 54% +106.9% 138.19 ± 33% numa-vmstat.node1.nr_anon_transparent_hugepages 16982 ± 18% +94.3% 32997 ± 19% numa-vmstat.node1.nr_slab_reclaimable 81860 ± 3% +113.2% 174536 ± 2% numa-vmstat.node1.nr_slab_unreclaimable 2521117 ± 4% -12.0% 2218931 ± 5% numa-vmstat.node1.numa_hit 2442392 ± 3% -13.6% 2111240 ± 7% numa-vmstat.node1.numa_local 19931 ± 28% +90.9% 38056 ± 7% numa-vmstat.node2.nr_slab_reclaimable 86088 ± 5% +99.7% 171897 numa-vmstat.node2.nr_slab_unreclaimable 18146 ± 12% +82.8% 33181 ± 13% numa-vmstat.node3.nr_slab_reclaimable 83060 ± 4% +111.5% 175660 ± 2% numa-vmstat.node3.nr_slab_unreclaimable 2.679e+10 +1.5% 2.718e+10 perf-stat.i.branch-instructions 43.06 +0.9 44.01 perf-stat.i.cache-miss-rate% 88883420 +5.0% 93333404 perf-stat.i.cache-misses 6.01 -1.2% 5.94 perf-stat.i.cpi 8654 -5.3% 8192 perf-stat.i.cycles-between-cache-misses 1.211e+11 +1.6% 1.23e+11 perf-stat.i.instructions 0.73 +3.5% 0.76 perf-stat.overall.MPKI 42.85 +0.9 43.75 perf-stat.overall.cache-miss-rate% 6.03 -1.3% 5.95 perf-stat.overall.cpi 8266 -4.7% 7879 perf-stat.overall.cycles-between-cache-misses 0.17 +1.3% 0.17 perf-stat.overall.ipc 2.635e+10 +1.4% 2.673e+10 perf-stat.ps.branch-instructions 86986582 +5.1% 91435274 perf-stat.ps.cache-misses 2.03e+08 +2.9% 2.09e+08 perf-stat.ps.cache-references 1.191e+11 +1.6% 1.21e+11 perf-stat.ps.instructions 7.248e+12 +1.6% 7.363e+12 perf-stat.total.instructions 70689 ± 34% +96.6% 138955 ± 6% numa-meminfo.node0.KReclaimable 70689 ± 34% +96.6% 138955 ± 6% numa-meminfo.node0.SReclaimable 356946 ± 6% +101.3% 718428 ± 3% numa-meminfo.node0.SUnreclaim 427635 ± 10% +100.5% 857383 ± 2% numa-meminfo.node0.Slab 139096 ± 54% +104.6% 284523 ± 33% numa-meminfo.node1.AnonHugePages 68643 ± 18% +93.3% 132663 ± 19% numa-meminfo.node1.KReclaimable 2076019 ± 6% +57.0% 3258377 ± 43% numa-meminfo.node1.MemUsed 68643 ± 18% +93.3% 132663 ± 19% numa-meminfo.node1.SReclaimable 330581 ± 3% +111.7% 699874 ± 2% numa-meminfo.node1.SUnreclaim 399224 ± 3% +108.5% 832538 ± 4% numa-meminfo.node1.Slab 80254 ± 27% +90.6% 152941 ± 7% numa-meminfo.node2.KReclaimable 80254 ± 27% +90.6% 152941 ± 7% numa-meminfo.node2.SReclaimable 347619 ± 4% +98.2% 689115 numa-meminfo.node2.SUnreclaim 427873 ± 7% +96.8% 842056 numa-meminfo.node2.Slab 73141 ± 11% +82.0% 133137 ± 13% numa-meminfo.node3.KReclaimable 3108062 ± 11% +41.5% 4398558 ± 26% numa-meminfo.node3.MemUsed 73141 ± 11% +82.0% 133137 ± 13% numa-meminfo.node3.SReclaimable 335184 ± 5% +110.2% 704492 ± 2% numa-meminfo.node3.SUnreclaim 408326 ± 5% +105.1% 837630 ± 3% numa-meminfo.node3.Slab 5.23 -1.9 3.31 perf-profile.calltrace.cycles-pp.stress_fd_lseek 46.32 -1.3 45.05 perf-profile.calltrace.cycles-pp.inode_sb_list_add.new_inode.__shmem_get_inode.__shmem_file_setup.shmem_zero_setup 46.38 -1.3 45.12 perf-profile.calltrace.cycles-pp.task_work_run.exit_to_user_mode_loop.do_syscall_64.entry_SYSCALL_64_after_hwframe.__munmap 46.32 -1.3 45.06 perf-profile.calltrace.cycles-pp.dput.__fput.task_work_run.exit_to_user_mode_loop.do_syscall_64 46.34 -1.3 45.08 perf-profile.calltrace.cycles-pp.__fput.task_work_run.exit_to_user_mode_loop.do_syscall_64.entry_SYSCALL_64_after_hwframe 46.44 -1.3 45.18 perf-profile.calltrace.cycles-pp.new_inode.__shmem_get_inode.__shmem_file_setup.shmem_zero_setup.__mmap_new_vma 46.54 -1.3 45.28 perf-profile.calltrace.cycles-pp.__shmem_get_inode.__shmem_file_setup.shmem_zero_setup.__mmap_new_vma.__mmap_region 46.30 -1.3 45.04 perf-profile.calltrace.cycles-pp.__dentry_kill.dput.__fput.task_work_run.exit_to_user_mode_loop 46.14 -1.3 44.88 perf-profile.calltrace.cycles-pp.evict.__dentry_kill.dput.__fput.task_work_run 45.84 -1.2 44.60 perf-profile.calltrace.cycles-pp.native_queued_spin_lock_slowpath._raw_spin_lock.evict.__dentry_kill.dput 45.99 -1.2 44.74 perf-profile.calltrace.cycles-pp._raw_spin_lock.evict.__dentry_kill.dput.__fput 0.67 +0.0 0.70 perf-profile.calltrace.cycles-pp.llseek 2.40 +0.0 2.44 perf-profile.calltrace.cycles-pp.mmap_region.do_mmap.vm_mmap_pgoff.ksys_mmap_pgoff.do_syscall_64 2.38 +0.0 2.43 perf-profile.calltrace.cycles-pp.__mmap_region.mmap_region.do_mmap.vm_mmap_pgoff.ksys_mmap_pgoff 2.54 +0.1 2.60 perf-profile.calltrace.cycles-pp.do_mmap.vm_mmap_pgoff.ksys_mmap_pgoff.do_syscall_64.entry_SYSCALL_64_after_hwframe 0.75 ± 2% +0.1 0.81 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe 2.58 +0.1 2.64 perf-profile.calltrace.cycles-pp.ksys_mmap_pgoff.do_syscall_64.entry_SYSCALL_64_after_hwframe.__mmap 0.77 ± 2% +0.1 0.83 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe 2.56 +0.1 2.62 perf-profile.calltrace.cycles-pp.vm_mmap_pgoff.ksys_mmap_pgoff.do_syscall_64.entry_SYSCALL_64_after_hwframe.__mmap 1.02 +0.1 1.09 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.stress_fd_lseek 1.06 +0.1 1.14 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.stress_fd_lseek 44.33 +0.8 45.15 perf-profile.calltrace.cycles-pp.exit_to_user_mode_loop.do_syscall_64.entry_SYSCALL_64_after_hwframe.__munmap 46.28 +0.8 47.11 perf-profile.calltrace.cycles-pp._raw_spin_lock.inode_sb_list_add.new_inode.__shmem_get_inode.__shmem_file_setup 46.20 +0.8 47.04 perf-profile.calltrace.cycles-pp.native_queued_spin_lock_slowpath._raw_spin_lock.inode_sb_list_add.new_inode.__shmem_get_inode 44.63 +0.8 45.47 perf-profile.calltrace.cycles-pp.shmem_zero_setup.__mmap_new_vma.__mmap_region.do_mmap.vm_mmap_pgoff 44.62 +0.8 45.47 perf-profile.calltrace.cycles-pp.__shmem_file_setup.shmem_zero_setup.__mmap_new_vma.__mmap_region.do_mmap 44.66 +0.8 45.51 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.__munmap 44.66 +0.8 45.51 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.__munmap 44.69 +0.8 45.53 perf-profile.calltrace.cycles-pp.__munmap 44.78 +0.9 45.63 perf-profile.calltrace.cycles-pp.__mmap_new_vma.__mmap_region.do_mmap.vm_mmap_pgoff.do_syscall_64 44.98 +0.9 45.84 perf-profile.calltrace.cycles-pp.__mmap_region.do_mmap.vm_mmap_pgoff.do_syscall_64.entry_SYSCALL_64_after_hwframe 45.11 +0.9 45.97 perf-profile.calltrace.cycles-pp.vm_mmap_pgoff.do_syscall_64.entry_SYSCALL_64_after_hwframe.__mmap 45.09 +0.9 45.96 perf-profile.calltrace.cycles-pp.do_mmap.vm_mmap_pgoff.do_syscall_64.entry_SYSCALL_64_after_hwframe.__mmap 47.74 +0.9 48.66 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.__mmap 47.74 +0.9 48.67 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.__mmap 47.80 +0.9 48.73 perf-profile.calltrace.cycles-pp.__mmap 0.00 +2.1 2.11 perf-profile.calltrace.cycles-pp.inode_sb_list_add.new_inode.__shmem_get_inode.__shmem_file_setup.shmem_zero_setup_desc 0.00 +2.1 2.12 perf-profile.calltrace.cycles-pp.new_inode.__shmem_get_inode.__shmem_file_setup.shmem_zero_setup_desc.__mmap_region 0.00 +2.1 2.12 perf-profile.calltrace.cycles-pp.__shmem_get_inode.__shmem_file_setup.shmem_zero_setup_desc.__mmap_region.mmap_region 0.00 +2.1 2.13 perf-profile.calltrace.cycles-pp.__shmem_file_setup.shmem_zero_setup_desc.__mmap_region.mmap_region.do_mmap 0.00 +2.1 2.13 perf-profile.calltrace.cycles-pp.shmem_zero_setup_desc.__mmap_region.mmap_region.do_mmap.vm_mmap_pgoff 5.24 -1.9 3.32 perf-profile.children.cycles-pp.stress_fd_lseek 46.39 -1.3 45.13 perf-profile.children.cycles-pp.task_work_run 46.73 -1.3 45.47 perf-profile.children.cycles-pp.shmem_zero_setup 46.30 -1.3 45.04 perf-profile.children.cycles-pp.__dentry_kill 46.48 -1.3 45.22 perf-profile.children.cycles-pp.exit_to_user_mode_loop 46.36 -1.3 45.11 perf-profile.children.cycles-pp.dput 46.14 -1.3 44.88 perf-profile.children.cycles-pp.evict 46.44 -1.2 45.20 perf-profile.children.cycles-pp.__fput 47.02 -1.2 45.78 perf-profile.children.cycles-pp.__mmap_new_vma 46.96 -1.2 45.72 perf-profile.children.cycles-pp.__munmap 92.11 -0.4 91.71 perf-profile.children.cycles-pp.native_queued_spin_lock_slowpath 92.39 -0.4 91.99 perf-profile.children.cycles-pp._raw_spin_lock 97.69 -0.1 97.58 perf-profile.children.cycles-pp.do_syscall_64 97.82 -0.1 97.71 perf-profile.children.cycles-pp.entry_SYSCALL_64_after_hwframe 0.08 -0.0 0.07 perf-profile.children.cycles-pp.__destroy_inode 0.11 +0.0 0.12 perf-profile.children.cycles-pp.kthread 0.11 +0.0 0.12 perf-profile.children.cycles-pp.ret_from_fork 0.11 +0.0 0.12 perf-profile.children.cycles-pp.ret_from_fork_asm 0.13 +0.0 0.14 perf-profile.children.cycles-pp.__fstat64 0.17 +0.0 0.18 perf-profile.children.cycles-pp.__x64_sys_pselect6 0.16 +0.0 0.17 perf-profile.children.cycles-pp.entry_SYSCALL_64_safe_stack 0.08 +0.0 0.09 perf-profile.children.cycles-pp.generic_perform_write 0.13 +0.0 0.14 perf-profile.children.cycles-pp.inet_listen 0.13 +0.0 0.14 perf-profile.children.cycles-pp.mas_store_gfp 0.08 +0.0 0.09 perf-profile.children.cycles-pp.mas_store_prealloc 0.11 ± 3% +0.0 0.12 perf-profile.children.cycles-pp.generic_file_write_iter 0.14 ± 2% +0.0 0.15 perf-profile.children.cycles-pp.mas_wr_node_store 0.15 +0.0 0.16 ± 2% perf-profile.children.cycles-pp.perf_event_mmap_event 0.38 +0.0 0.39 perf-profile.children.cycles-pp.arch_exit_to_user_mode_prepare 0.21 +0.0 0.22 perf-profile.children.cycles-pp.__x64_sys_fcntl 0.08 ± 5% +0.0 0.10 ± 4% perf-profile.children.cycles-pp.do_iter_readv_writev 0.10 +0.0 0.12 ± 4% perf-profile.children.cycles-pp.run_ksoftirqd 0.21 +0.0 0.23 ± 2% perf-profile.children.cycles-pp.kmem_cache_alloc_noprof 0.10 +0.0 0.12 ± 4% perf-profile.children.cycles-pp.smpboot_thread_fn 0.13 +0.0 0.15 ± 3% perf-profile.children.cycles-pp.handle_softirqs 0.12 ± 3% +0.0 0.14 ± 2% perf-profile.children.cycles-pp.rcu_core 0.12 +0.0 0.14 ± 3% perf-profile.children.cycles-pp.alloc_inode 0.12 +0.0 0.14 ± 3% perf-profile.children.cycles-pp.rcu_do_batch 0.67 +0.0 0.69 perf-profile.children.cycles-pp.entry_SYSCALL_64 0.46 +0.0 0.48 perf-profile.children.cycles-pp.do_vmi_munmap 0.44 +0.0 0.46 perf-profile.children.cycles-pp.do_vmi_align_munmap 0.48 +0.0 0.51 perf-profile.children.cycles-pp.entry_SYSRETQ_unsafe_stack 0.47 +0.0 0.50 perf-profile.children.cycles-pp.__vm_munmap 0.47 +0.0 0.50 perf-profile.children.cycles-pp.__x64_sys_munmap 0.05 +0.0 0.08 perf-profile.children.cycles-pp.inode_init_always_gfp 0.31 ± 4% +0.0 0.34 ± 4% perf-profile.children.cycles-pp.do_filp_open 0.31 ± 5% +0.0 0.34 ± 4% perf-profile.children.cycles-pp.path_openat 0.37 ± 4% +0.0 0.40 ± 3% perf-profile.children.cycles-pp.__x64_sys_openat 0.37 ± 4% +0.0 0.40 ± 3% perf-profile.children.cycles-pp.do_sys_openat2 0.85 +0.0 0.89 perf-profile.children.cycles-pp.llseek 2.40 +0.0 2.44 perf-profile.children.cycles-pp.mmap_region 2.59 +0.1 2.64 perf-profile.children.cycles-pp.ksys_mmap_pgoff 46.32 +0.8 47.16 perf-profile.children.cycles-pp.inode_sb_list_add 46.44 +0.9 47.30 perf-profile.children.cycles-pp.new_inode 46.54 +0.9 47.40 perf-profile.children.cycles-pp.__shmem_get_inode 46.73 +0.9 47.60 perf-profile.children.cycles-pp.__shmem_file_setup 47.37 +0.9 48.28 perf-profile.children.cycles-pp.__mmap_region 47.64 +0.9 48.56 perf-profile.children.cycles-pp.do_mmap 47.68 +0.9 48.60 perf-profile.children.cycles-pp.vm_mmap_pgoff 47.83 +0.9 48.76 perf-profile.children.cycles-pp.__mmap 0.00 +2.1 2.13 perf-profile.children.cycles-pp.shmem_zero_setup_desc 91.71 -0.4 91.31 perf-profile.self.cycles-pp.native_queued_spin_lock_slowpath 0.22 +0.0 0.23 perf-profile.self.cycles-pp.entry_SYSCALL_64 0.30 +0.0 0.31 perf-profile.self.cycles-pp.do_syscall_64 0.35 +0.0 0.36 perf-profile.self.cycles-pp.arch_exit_to_user_mode_prepare 0.47 +0.0 0.50 perf-profile.self.cycles-pp.entry_SYSRETQ_unsafe_stack 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