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46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: HRxU3V/FZpZRLNsZB2Klg34y/VkxfmvMAZafXGTPG2f1A8yoNyWy+ZRCm6b8F7lQpyu2SkxqiBIIDNNszx/y/w== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR11MB8206 X-OriginatorOrg: intel.com Hello, kernel test robot noticed a 2.3% improvement of stress-ng.sem.sem_wait_calls_per_sec on: commit: e2d4f42271155045a49b89530f2c06ad8e9f1a1e ("rseq: Rework the TIF_NOTIFY handler") https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git core/rseq 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: sem cpufreq_governor: performance Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20251125/202511251654.c89d08f7-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/sem/stress-ng/60s commit: 9f6ffd4ceb ("rseq: Separate the signal delivery path") e2d4f42271 ("rseq: Rework the TIF_NOTIFY handler") 9f6ffd4cebda8684 e2d4f42271155045a49b89530f2 ---------------- --------------------------- %stddev %change %stddev \ | \ 796.49 ± 5% +15.3% 918.13 ± 12% sched_debug.cpu.curr->pid.stddev 19498 ± 3% +18.9% 23177 ± 5% numa-meminfo.node0.KernelStack 22517 ± 2% -15.5% 19034 ± 7% numa-meminfo.node1.KernelStack 41569 ± 58% +192.9% 121756 ± 44% numa-numastat.node0.other_node 156472 ± 15% -51.3% 76228 ± 70% numa-numastat.node1.other_node 17079533 ± 7% -23.7% 13033056 ± 45% perf-sched.total_wait_and_delay.count.ms 17079533 ± 7% -23.7% 13033056 ± 45% perf-sched.wait_and_delay.count.[unknown].[unknown].[unknown].[unknown].[unknown] 385459 +2.3% 394214 stress-ng.sem.sem_timedwait_calls_per_sec 385418 +2.3% 394172 stress-ng.sem.sem_wait_calls_per_sec 3947 +2.2% 4035 stress-ng.time.user_time 19505 ± 3% +18.8% 23176 ± 5% numa-vmstat.node0.nr_kernel_stack 41569 ± 58% +192.9% 121756 ± 44% numa-vmstat.node0.numa_other 22534 ± 2% -15.5% 19034 ± 7% numa-vmstat.node1.nr_kernel_stack 156472 ± 15% -51.3% 76228 ± 70% numa-vmstat.node1.numa_other 1.51e+11 +1.9% 1.538e+11 perf-stat.i.branch-instructions 0.88 -1.9% 0.87 perf-stat.i.cpi 81367 ± 10% +58.9% 129281 ± 30% perf-stat.i.cycles-between-cache-misses 6.983e+11 +1.7% 7.105e+11 perf-stat.i.instructions 1.15 +1.7% 1.17 perf-stat.i.ipc 0.87 -1.7% 0.85 perf-stat.overall.cpi 1.16 +1.8% 1.18 perf-stat.overall.ipc 1.484e+11 +1.9% 1.513e+11 perf-stat.ps.branch-instructions 6.864e+11 +1.8% 6.986e+11 perf-stat.ps.instructions 4.197e+13 +2.1% 4.284e+13 perf-stat.total.instructions 5.09 -2.0 3.14 ± 2% perf-profile.calltrace.cycles-pp.__rseq_handle_notify_resume.exit_to_user_mode_loop.do_syscall_64.entry_SYSCALL_64_after_hwframe.__sched_yield 6.22 -1.9 4.29 ± 2% perf-profile.calltrace.cycles-pp.exit_to_user_mode_loop.do_syscall_64.entry_SYSCALL_64_after_hwframe.__sched_yield 58.07 -0.9 57.21 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.__sched_yield 58.59 -0.9 57.74 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.__sched_yield 2.45 +0.2 2.67 ± 2% perf-profile.calltrace.cycles-pp.rseq_set_ids_get_csaddr.__rseq_handle_notify_resume.exit_to_user_mode_loop.do_syscall_64.entry_SYSCALL_64_after_hwframe 9.50 +0.3 9.76 perf-profile.calltrace.cycles-pp.pick_next_task_fair.__pick_next_task.__schedule.schedule.__x64_sys_sched_yield 9.71 +0.3 9.98 perf-profile.calltrace.cycles-pp.__pick_next_task.__schedule.schedule.__x64_sys_sched_yield.do_syscall_64 18.18 +0.4 18.57 perf-profile.calltrace.cycles-pp.__schedule.schedule.__x64_sys_sched_yield.do_syscall_64.entry_SYSCALL_64_after_hwframe 18.37 +0.4 18.77 perf-profile.calltrace.cycles-pp.schedule.__x64_sys_sched_yield.do_syscall_64.entry_SYSCALL_64_after_hwframe.__sched_yield 25.20 +0.5 25.71 perf-profile.calltrace.cycles-pp.__x64_sys_sched_yield.do_syscall_64.entry_SYSCALL_64_after_hwframe.__sched_yield 5.12 -2.0 3.16 ± 2% perf-profile.children.cycles-pp.__rseq_handle_notify_resume 6.24 -1.9 4.31 ± 2% perf-profile.children.cycles-pp.exit_to_user_mode_loop 58.27 -0.8 57.44 perf-profile.children.cycles-pp.do_syscall_64 58.78 -0.8 57.96 perf-profile.children.cycles-pp.entry_SYSCALL_64_after_hwframe 0.05 +0.0 0.06 ± 6% perf-profile.children.cycles-pp.sem_wait@plt 1.16 ± 2% +0.0 1.20 ± 2% perf-profile.children.cycles-pp.__pick_eevdf 2.45 +0.2 2.68 ± 2% perf-profile.children.cycles-pp.rseq_set_ids_get_csaddr 9.54 +0.3 9.80 perf-profile.children.cycles-pp.pick_next_task_fair 9.73 +0.3 10.00 perf-profile.children.cycles-pp.__pick_next_task 18.26 +0.4 18.66 perf-profile.children.cycles-pp.__schedule 18.39 +0.4 18.80 perf-profile.children.cycles-pp.schedule 25.22 +0.5 25.73 perf-profile.children.cycles-pp.__x64_sys_sched_yield 0.58 -0.1 0.48 ± 3% perf-profile.self.cycles-pp.__rseq_handle_notify_resume 0.96 +0.0 0.98 perf-profile.self.cycles-pp.update_curr 2.43 +0.2 2.67 ± 2% perf-profile.self.cycles-pp.rseq_set_ids_get_csaddr 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