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46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: tan0H4rz5cY1KgayHw0FvTxcCIVC07/nRAeADps5t9CxX0CkLlPac9/+iYJLEWLmPpJdK5VW28H5VdIwkAPyOg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR11MB6907 X-OriginatorOrg: intel.com Hello, kernel test robot noticed a 3.1% improvement of stress-ng.sem.sem_wait_calls_per_sec on: commit: abc850e7616c91ebaa3f5ba3617ab0a104d45039 ("rseq: Provide and use rseq_update_user_cs()") 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: 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/20251209/202512092342.3ee2de77-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: 9c37cb6e80 ("rseq: Provide static branch for runtime debugging") abc850e761 ("rseq: Provide and use rseq_update_user_cs()") 9c37cb6e80b8fcdd abc850e7616c91ebaa3f5ba3617 ---------------- --------------------------- %stddev %change %stddev \ | \ 713480 ± 29% -24.9% 536114 ± 28% meminfo.Mapped 19261235 ± 14% -28.3% 13815751 ± 45% perf-sched.total_wait_and_delay.count.ms 19261235 ± 14% -28.3% 13815751 ± 45% perf-sched.wait_and_delay.count.[unknown].[unknown].[unknown].[unknown].[unknown] 209285 ± 4% -3.8% 201417 ± 3% proc-vmstat.nr_anon_pages 179839 ± 29% -25.3% 134393 ± 28% proc-vmstat.nr_mapped 0.21 +0.0 0.22 perf-stat.i.branch-miss-rate% 3.044e+08 +3.6% 3.154e+08 perf-stat.i.branch-misses 1.933e+08 +3.5% 2.001e+08 perf-stat.i.context-switches 0.93 ± 3% +6.7% 0.99 perf-stat.i.metric.M/sec 0.20 +0.0 0.21 perf-stat.overall.branch-miss-rate% 2.996e+08 +3.6% 3.104e+08 perf-stat.ps.branch-misses 1.903e+08 +3.5% 1.97e+08 perf-stat.ps.context-switches 1.341e+10 +2.6% 1.377e+10 stress-ng.sem.ops 2.235e+08 +2.6% 2.294e+08 stress-ng.sem.ops_per_sec 374680 +3.1% 386364 stress-ng.sem.sem_timedwait_calls_per_sec 374638 +3.2% 386525 stress-ng.sem.sem_trywait_calls_per_sec 374649 +3.1% 386331 stress-ng.sem.sem_wait_calls_per_sec 1.178e+10 +3.5% 1.219e+10 stress-ng.time.involuntary_context_switches 7623 -1.2% 7530 stress-ng.time.system_time 3803 +2.8% 3908 stress-ng.time.user_time 8.44 -2.8 5.65 perf-profile.calltrace.cycles-pp.__rseq_handle_notify_resume.exit_to_user_mode_loop.do_syscall_64.entry_SYSCALL_64_after_hwframe.__sched_yield 9.62 -2.6 7.02 perf-profile.calltrace.cycles-pp.exit_to_user_mode_loop.do_syscall_64.entry_SYSCALL_64_after_hwframe.__sched_yield 59.80 -1.0 58.80 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.__sched_yield 60.34 -1.0 59.38 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.__sched_yield 0.83 +0.0 0.86 perf-profile.calltrace.cycles-pp._raw_spin_lock.raw_spin_rq_lock_nested.__schedule.schedule.__x64_sys_sched_yield 0.65 +0.0 0.68 perf-profile.calltrace.cycles-pp.__update_load_avg_se.update_load_avg.put_prev_entity.pick_next_task_fair.__pick_next_task 1.00 +0.0 1.03 perf-profile.calltrace.cycles-pp.update_load_avg.set_next_entity.pick_next_task_fair.__pick_next_task.__schedule 1.11 +0.0 1.15 perf-profile.calltrace.cycles-pp.__enqueue_entity.put_prev_entity.pick_next_task_fair.__pick_next_task.__schedule 1.56 +0.1 1.62 perf-profile.calltrace.cycles-pp.update_load_avg.put_prev_entity.pick_next_task_fair.__pick_next_task.__schedule 1.73 +0.1 1.79 perf-profile.calltrace.cycles-pp.native_sched_clock.sched_clock.sched_clock_cpu.update_rq_clock.yield_task_fair 1.77 +0.1 1.84 perf-profile.calltrace.cycles-pp.sched_clock.sched_clock_cpu.update_rq_clock.yield_task_fair.do_sched_yield 2.13 +0.1 2.20 perf-profile.calltrace.cycles-pp.__rdgsbase_inactive.__sched_yield 1.84 +0.1 1.90 perf-profile.calltrace.cycles-pp.sched_clock_cpu.update_rq_clock.yield_task_fair.do_sched_yield.__x64_sys_sched_yield 1.95 +0.1 2.02 perf-profile.calltrace.cycles-pp.set_next_entity.pick_next_task_fair.__pick_next_task.__schedule.schedule 2.06 +0.1 2.14 perf-profile.calltrace.cycles-pp.update_rq_clock.yield_task_fair.do_sched_yield.__x64_sys_sched_yield.do_syscall_64 2.38 +0.1 2.46 perf-profile.calltrace.cycles-pp.prepare_task_switch.__schedule.schedule.__x64_sys_sched_yield.do_syscall_64 2.98 +0.1 3.08 perf-profile.calltrace.cycles-pp.__wrgsbase_inactive.__sched_yield 3.26 +0.1 3.38 perf-profile.calltrace.cycles-pp.put_prev_entity.pick_next_task_fair.__pick_next_task.__schedule.schedule 5.15 +0.2 5.32 perf-profile.calltrace.cycles-pp.yield_task_fair.do_sched_yield.__x64_sys_sched_yield.do_syscall_64.entry_SYSCALL_64_after_hwframe 6.45 +0.2 6.66 perf-profile.calltrace.cycles-pp.do_sched_yield.__x64_sys_sched_yield.do_syscall_64.entry_SYSCALL_64_after_hwframe.__sched_yield 3.28 +0.2 3.50 perf-profile.calltrace.cycles-pp.rseq_update_cpu_node_id.__rseq_handle_notify_resume.exit_to_user_mode_loop.do_syscall_64.entry_SYSCALL_64_after_hwframe 9.21 +0.3 9.50 perf-profile.calltrace.cycles-pp.pick_next_task_fair.__pick_next_task.__schedule.schedule.__x64_sys_sched_yield 9.41 +0.3 9.70 perf-profile.calltrace.cycles-pp.__pick_next_task.__schedule.schedule.__x64_sys_sched_yield.do_syscall_64 17.41 +0.5 17.88 perf-profile.calltrace.cycles-pp.__schedule.schedule.__x64_sys_sched_yield.do_syscall_64.entry_SYSCALL_64_after_hwframe 17.59 +0.5 18.07 perf-profile.calltrace.cycles-pp.schedule.__x64_sys_sched_yield.do_syscall_64.entry_SYSCALL_64_after_hwframe.__sched_yield 16.02 +0.6 16.60 perf-profile.calltrace.cycles-pp.os_xsave.__sched_yield 24.16 +0.7 24.86 perf-profile.calltrace.cycles-pp.__x64_sys_sched_yield.do_syscall_64.entry_SYSCALL_64_after_hwframe.__sched_yield 20.98 +0.7 21.71 perf-profile.calltrace.cycles-pp.restore_fpregs_from_fpstate.switch_fpu_return.arch_exit_to_user_mode_prepare.do_syscall_64.entry_SYSCALL_64_after_hwframe 23.42 +0.8 24.26 perf-profile.calltrace.cycles-pp.switch_fpu_return.arch_exit_to_user_mode_prepare.do_syscall_64.entry_SYSCALL_64_after_hwframe.__sched_yield 25.22 +0.9 26.11 perf-profile.calltrace.cycles-pp.arch_exit_to_user_mode_prepare.do_syscall_64.entry_SYSCALL_64_after_hwframe.__sched_yield 8.52 -2.6 5.88 perf-profile.children.cycles-pp.__rseq_handle_notify_resume 9.64 -2.6 7.04 perf-profile.children.cycles-pp.exit_to_user_mode_loop 59.97 -1.0 58.99 perf-profile.children.cycles-pp.do_syscall_64 60.46 -1.0 59.50 perf-profile.children.cycles-pp.entry_SYSCALL_64_after_hwframe 0.09 +0.0 0.10 perf-profile.children.cycles-pp.propagate_entity_load_avg 0.12 ± 4% +0.0 0.14 ± 3% perf-profile.children.cycles-pp.clock_gettime 1.12 +0.0 1.16 perf-profile.children.cycles-pp.__enqueue_entity 1.14 +0.0 1.18 perf-profile.children.cycles-pp.__update_load_avg_se 1.97 +0.1 2.04 perf-profile.children.cycles-pp.set_next_entity 2.38 +0.1 2.46 perf-profile.children.cycles-pp.prepare_task_switch 2.41 +0.1 2.49 perf-profile.children.cycles-pp.__rdgsbase_inactive 2.67 +0.1 2.77 perf-profile.children.cycles-pp.update_load_avg 3.26 +0.1 3.37 perf-profile.children.cycles-pp.__wrgsbase_inactive 3.30 +0.1 3.41 perf-profile.children.cycles-pp.put_prev_entity 5.17 +0.2 5.34 perf-profile.children.cycles-pp.yield_task_fair 6.49 +0.2 6.70 perf-profile.children.cycles-pp.do_sched_yield 3.45 +0.2 3.68 perf-profile.children.cycles-pp.rseq_update_cpu_node_id 9.24 +0.3 9.54 perf-profile.children.cycles-pp.pick_next_task_fair 9.43 +0.3 9.73 perf-profile.children.cycles-pp.__pick_next_task 17.48 +0.5 17.96 perf-profile.children.cycles-pp.__schedule 17.61 +0.5 18.09 perf-profile.children.cycles-pp.schedule 16.04 +0.6 16.61 perf-profile.children.cycles-pp.os_xsave 24.18 +0.7 24.88 perf-profile.children.cycles-pp.__x64_sys_sched_yield 21.01 +0.7 21.75 perf-profile.children.cycles-pp.restore_fpregs_from_fpstate 23.44 +0.8 24.28 perf-profile.children.cycles-pp.switch_fpu_return 25.24 +0.9 26.15 perf-profile.children.cycles-pp.arch_exit_to_user_mode_prepare 0.67 +0.0 0.70 perf-profile.self.cycles-pp.___perf_sw_event 0.92 +0.0 0.95 perf-profile.self.cycles-pp.update_curr 1.11 +0.0 1.15 perf-profile.self.cycles-pp.__enqueue_entity 0.80 +0.0 0.84 perf-profile.self.cycles-pp.update_load_avg 0.70 +0.0 0.73 perf-profile.self.cycles-pp.pick_next_task_fair 1.04 +0.0 1.08 perf-profile.self.cycles-pp.exit_to_user_mode_loop 1.12 +0.1 1.17 perf-profile.self.cycles-pp.__update_load_avg_se 1.78 +0.1 1.84 perf-profile.self.cycles-pp.arch_exit_to_user_mode_prepare 1.48 +0.1 1.54 perf-profile.self.cycles-pp.prepare_task_switch 0.69 +0.1 0.75 perf-profile.self.cycles-pp.do_syscall_64 2.40 +0.1 2.48 perf-profile.self.cycles-pp.__rdgsbase_inactive 3.12 +0.1 3.23 perf-profile.self.cycles-pp.__wrgsbase_inactive 16.02 +0.6 16.61 perf-profile.self.cycles-pp.os_xsave 21.00 +0.7 21.74 perf-profile.self.cycles-pp.restore_fpregs_from_fpstate 0.37 +2.0 2.40 perf-profile.self.cycles-pp.__rseq_handle_notify_resume 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