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X-OriginatorOrg: intel.com Hello, kernel test robot noticed a 2.8% regression of will-it-scale.per_process_ops on: commit: 96d1610e0b20b5a627773874b4514ae922ad98f6 ("sched: Optimize hrtimer handling") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master [still regression on linus/master 1d51b370a0f8f642f4fc84c795fbedac0fcdbbd2] [still regression on linux-next/master 936c21068d7ade00325e40d82bfd2f3f29d9f659] [still regression on fix commit eef9f648fb0e92618041f019d4bdcf7ae17cb743] testcase: will-it-scale config: x86_64-rhel-9.4 compiler: gcc-14 test machine: 48 threads 2 sockets Intel(R) Xeon(R) CPU E5-2697 v2 @ 2.70GHz (Ivy Bridge-EP) with 64G memory parameters: nr_task: 100% mode: process test: context_switch1 cpufreq_governor: performance If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-lkp/202604241448.365c92f9-lkp@intel.com Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260424/202604241448.365c92f9-lkp@intel.com ========================================================================================= compiler/cpufreq_governor/kconfig/mode/nr_task/rootfs/tbox_group/test/testcase: gcc-14/performance/x86_64-rhel-9.4/process/100%/debian-13-x86_64-20250902.cgz/lkp-ivb-2ep2/context_switch1/will-it-scale commit: c3a92213eb ("sched: Use hrtimer_highres_enabled()") 96d1610e0b ("sched: Optimize hrtimer handling") c3a92213eb3dd8ea 96d1610e0b20b5a627773874b45 ---------------- --------------------------- %stddev %change %stddev \ | \ 11427219 -2.8% 11104140 will-it-scale.48.processes 238066 -2.8% 231335 will-it-scale.per_process_ops 11427219 -2.8% 11104140 will-it-scale.workload 11248988 -2.7% 10943054 vmstat.system.cs 1.394e+10 -2.3% 1.362e+10 perf-stat.i.branch-instructions 1.94e+08 -1.8% 1.906e+08 perf-stat.i.branch-misses 98548808 ± 5% +24.2% 1.224e+08 ± 5% perf-stat.i.cache-references 11359604 -2.7% 11053971 perf-stat.i.context-switches 6.86e+10 -2.3% 6.705e+10 perf-stat.i.instructions 0.49 -2.4% 0.48 perf-stat.i.ipc 236.66 -2.7% 230.29 perf-stat.i.metric.K/sec 2.04 +2.5% 2.09 perf-stat.overall.cpi 0.49 -2.5% 0.48 perf-stat.overall.ipc 1.389e+10 -2.3% 1.357e+10 perf-stat.ps.branch-instructions 1.933e+08 -1.8% 1.899e+08 perf-stat.ps.branch-misses 98259743 ± 5% +24.2% 1.22e+08 ± 5% perf-stat.ps.cache-references 11321664 -2.7% 11016986 perf-stat.ps.context-switches 6.837e+10 -2.3% 6.683e+10 perf-stat.ps.instructions 2.077e+13 -2.4% 2.028e+13 perf-stat.total.instructions 3.02 -0.1 2.90 perf-profile.calltrace.cycles-pp.pick_task_fair.pick_next_task_fair.__pick_next_task.__schedule.schedule 3.79 -0.1 3.68 perf-profile.calltrace.cycles-pp.perf_pmu_sched_task.__perf_event_task_sched_out.prepare_task_switch.__schedule.schedule 5.13 -0.1 5.04 perf-profile.calltrace.cycles-pp.pick_next_task_fair.__pick_next_task.__schedule.schedule.exit_to_user_mode_loop 2.72 -0.1 2.64 perf-profile.calltrace.cycles-pp.put_prev_entity.pick_next_task_fair.__pick_next_task.__schedule.schedule 2.87 -0.1 2.79 perf-profile.calltrace.cycles-pp.finish_task_switch.__schedule.schedule.anon_pipe_read.vfs_read 5.27 -0.1 5.19 perf-profile.calltrace.cycles-pp.__pick_next_task.__schedule.schedule.exit_to_user_mode_loop.do_syscall_64 1.82 -0.1 1.76 perf-profile.calltrace.cycles-pp.perf_pmu_sched_task.finish_task_switch.__schedule.schedule.anon_pipe_read 1.41 -0.1 1.35 perf-profile.calltrace.cycles-pp.__switch_to 0.84 -0.0 0.79 ± 2% perf-profile.calltrace.cycles-pp.anon_pipe_buf_release.anon_pipe_read.vfs_read.ksys_read.do_syscall_64 1.64 -0.0 1.59 perf-profile.calltrace.cycles-pp.intel_pmu_disable_all.perf_pmu_sched_task.__perf_event_task_sched_out.prepare_task_switch.__schedule 0.56 -0.0 0.52 ± 2% perf-profile.calltrace.cycles-pp.rw_verify_area.vfs_write.ksys_write.do_syscall_64.entry_SYSCALL_64_after_hwframe 1.38 -0.0 1.34 perf-profile.calltrace.cycles-pp.update_curr.pick_task_fair.pick_next_task_fair.__pick_next_task.__schedule 0.64 +0.0 0.67 perf-profile.calltrace.cycles-pp.os_xsave 1.25 +0.0 1.30 perf-profile.calltrace.cycles-pp.__switch_to_asm 2.62 +0.1 2.68 perf-profile.calltrace.cycles-pp.set_next_entity.pick_next_task_fair.__pick_next_task.__schedule.schedule 3.19 +0.1 3.27 perf-profile.calltrace.cycles-pp.prepare_task_switch.__schedule.schedule.exit_to_user_mode_loop.do_syscall_64 0.62 ± 3% +0.1 0.70 ± 3% perf-profile.calltrace.cycles-pp.___perf_sw_event.prepare_task_switch.__schedule.schedule.exit_to_user_mode_loop 0.65 ± 3% +0.1 0.73 ± 5% perf-profile.calltrace.cycles-pp.___perf_sw_event.prepare_task_switch.__schedule.schedule.anon_pipe_read 1.78 ± 2% +0.1 1.86 perf-profile.calltrace.cycles-pp.switch_fpu_return.arch_exit_to_user_mode_prepare.do_syscall_64.entry_SYSCALL_64_after_hwframe 0.58 ± 3% +0.1 0.67 ± 2% perf-profile.calltrace.cycles-pp._copy_from_iter.copy_page_from_iter.anon_pipe_write.vfs_write.ksys_write 3.27 +0.1 3.37 perf-profile.calltrace.cycles-pp.prepare_task_switch.__schedule.schedule.anon_pipe_read.vfs_read 1.38 +0.1 1.48 ± 2% perf-profile.calltrace.cycles-pp.copy_page_from_iter.anon_pipe_write.vfs_write.ksys_write.do_syscall_64 1.34 ± 3% +0.2 1.51 ± 7% perf-profile.calltrace.cycles-pp.update_curr.wakeup_preempt_fair.wakeup_preempt.try_to_wake_up.autoremove_wake_function 1.08 ± 7% +0.2 1.29 ± 10% perf-profile.calltrace.cycles-pp.update_se.update_curr.wakeup_preempt_fair.wakeup_preempt.try_to_wake_up 1.78 ± 3% +0.2 2.00 ± 6% perf-profile.calltrace.cycles-pp.update_curr.dequeue_entity.dequeue_entities.dequeue_task_fair.try_to_block_task 2.18 +0.2 2.41 ± 3% perf-profile.calltrace.cycles-pp.wakeup_preempt_fair.wakeup_preempt.try_to_wake_up.autoremove_wake_function.__wake_up_common 2.58 +0.2 2.82 ± 2% perf-profile.calltrace.cycles-pp.wakeup_preempt.try_to_wake_up.autoremove_wake_function.__wake_up_common.__wake_up_sync_key 1.33 ± 6% +0.3 1.59 ± 9% perf-profile.calltrace.cycles-pp.update_se.update_curr.dequeue_entity.dequeue_entities.dequeue_task_fair 3.38 ± 2% +0.3 3.65 ± 2% perf-profile.calltrace.cycles-pp.dequeue_entity.dequeue_entities.dequeue_task_fair.try_to_block_task.__schedule 4.35 ± 2% +0.3 4.66 ± 2% perf-profile.calltrace.cycles-pp.dequeue_entities.dequeue_task_fair.try_to_block_task.__schedule.schedule 5.12 +0.3 5.44 ± 2% perf-profile.calltrace.cycles-pp.try_to_block_task.__schedule.schedule.anon_pipe_read.vfs_read 4.79 ± 2% +0.3 5.12 ± 2% perf-profile.calltrace.cycles-pp.dequeue_task_fair.try_to_block_task.__schedule.schedule.anon_pipe_read 20.64 +0.4 21.01 perf-profile.calltrace.cycles-pp.schedule.anon_pipe_read.vfs_read.ksys_read.do_syscall_64 0.00 +0.6 0.57 ± 7% perf-profile.calltrace.cycles-pp.do_perf_trace_sched_stat_runtime.perf_trace_sched_stat_runtime.update_se.update_curr.wakeup_preempt_fair 0.00 +0.6 0.60 ± 7% perf-profile.calltrace.cycles-pp.perf_trace_sched_stat_runtime.update_se.update_curr.wakeup_preempt_fair.wakeup_preempt 0.00 +0.6 0.63 ± 12% perf-profile.calltrace.cycles-pp.read 0.00 +0.7 0.69 ± 2% perf-profile.calltrace.cycles-pp.do_perf_trace_sched_stat_runtime.perf_trace_sched_stat_runtime.update_se.update_curr.dequeue_entity 0.00 +0.7 0.71 ± 2% perf-profile.calltrace.cycles-pp.perf_trace_sched_stat_runtime.update_se.update_curr.dequeue_entity.dequeue_entities 7.45 -0.2 7.26 perf-profile.children.cycles-pp.perf_pmu_sched_task 9.62 -0.1 9.48 perf-profile.children.cycles-pp.__pick_next_task 3.09 -0.1 2.98 perf-profile.children.cycles-pp.pick_task_fair 5.78 -0.1 5.68 perf-profile.children.cycles-pp.finish_task_switch 2.88 -0.1 2.78 perf-profile.children.cycles-pp.put_prev_entity 1.03 -0.1 0.94 perf-profile.children.cycles-pp.__perf_event_task_sched_in 0.29 ± 3% -0.1 0.21 ± 4% perf-profile.children.cycles-pp.__rdgsbase_inactive 3.20 -0.1 3.12 perf-profile.children.cycles-pp.intel_pmu_disable_all 0.30 -0.1 0.22 ± 4% perf-profile.children.cycles-pp.propagate_entity_load_avg 0.40 -0.1 0.34 ± 5% perf-profile.children.cycles-pp._raw_spin_unlock_irqrestore 0.67 -0.1 0.60 ± 3% perf-profile.children.cycles-pp.security_file_permission 1.60 -0.1 1.54 perf-profile.children.cycles-pp.__switch_to 1.01 -0.1 0.96 ± 2% perf-profile.children.cycles-pp.rw_verify_area 1.18 -0.1 1.12 ± 2% perf-profile.children.cycles-pp.__pick_eevdf 1.73 ± 2% -0.1 1.67 perf-profile.children.cycles-pp.avg_vruntime 1.00 ± 2% -0.1 0.95 perf-profile.children.cycles-pp.__update_load_avg_cfs_rq 0.65 ± 4% -0.1 0.60 ± 2% perf-profile.children.cycles-pp.update_entity_lag 0.84 -0.0 0.80 ± 2% perf-profile.children.cycles-pp.anon_pipe_buf_release 0.60 ± 2% -0.0 0.56 perf-profile.children.cycles-pp.vruntime_eligible 0.42 ± 2% -0.0 0.39 ± 2% perf-profile.children.cycles-pp.__x64_sys_read 0.56 -0.0 0.53 perf-profile.children.cycles-pp.update_rq_clock_task 0.18 ± 3% -0.0 0.15 ± 3% perf-profile.children.cycles-pp.perf_cgroup_switch 0.11 ± 6% -0.0 0.08 ± 5% perf-profile.children.cycles-pp.save_fpregs_to_fpstate 0.81 -0.0 0.78 perf-profile.children.cycles-pp._raw_spin_lock 0.60 ± 2% -0.0 0.57 perf-profile.children.cycles-pp.native_sched_clock 0.34 ± 2% -0.0 0.31 ± 4% perf-profile.children.cycles-pp.child 0.17 ± 4% -0.0 0.14 ± 3% perf-profile.children.cycles-pp.pick_next_task 0.97 -0.0 0.95 perf-profile.children.cycles-pp.update_rq_clock 0.16 ± 3% -0.0 0.14 ± 4% perf-profile.children.cycles-pp.dequeue_task 0.05 +0.0 0.06 ± 7% perf-profile.children.cycles-pp.__x86_indirect_thunk_rdx 0.27 ± 2% +0.0 0.29 ± 3% perf-profile.children.cycles-pp.place_entity 0.65 +0.0 0.67 ± 2% perf-profile.children.cycles-pp.os_xsave 0.08 ± 6% +0.0 0.10 ± 4% perf-profile.children.cycles-pp.raw_spin_rq_unlock 0.09 ± 5% +0.0 0.12 ± 4% perf-profile.children.cycles-pp.rb_next 0.11 ± 16% +0.0 0.15 ± 15% perf-profile.children.cycles-pp.perf_swevent_event 0.35 ± 2% +0.0 0.40 perf-profile.children.cycles-pp.__x86_indirect_thunk_rax 2.72 +0.1 2.77 perf-profile.children.cycles-pp.set_next_entity 1.18 +0.1 1.24 perf-profile.children.cycles-pp.update_load_avg 0.09 ± 6% +0.1 0.16 ± 6% perf-profile.children.cycles-pp.kill_fasync 1.31 +0.1 1.38 perf-profile.children.cycles-pp.__switch_to_asm 1.78 ± 2% +0.1 1.87 perf-profile.children.cycles-pp.switch_fpu_return 0.59 ± 3% +0.1 0.68 ± 2% perf-profile.children.cycles-pp._copy_from_iter 1.40 +0.1 1.49 ± 2% perf-profile.children.cycles-pp.copy_page_from_iter 1.04 +0.1 1.14 perf-profile.children.cycles-pp.__update_load_avg_se 1.29 ± 3% +0.2 1.45 ± 4% perf-profile.children.cycles-pp.___perf_sw_event 6.50 +0.2 6.69 perf-profile.children.cycles-pp.prepare_task_switch 2.34 +0.2 2.59 ± 2% perf-profile.children.cycles-pp.wakeup_preempt_fair 2.78 +0.3 3.03 ± 2% perf-profile.children.cycles-pp.wakeup_preempt 3.43 ± 2% +0.3 3.70 ± 2% perf-profile.children.cycles-pp.dequeue_entity 4.39 ± 2% +0.3 4.70 ± 2% perf-profile.children.cycles-pp.dequeue_entities 5.13 +0.3 5.45 ± 2% perf-profile.children.cycles-pp.try_to_block_task 4.80 ± 2% +0.3 5.14 ± 2% perf-profile.children.cycles-pp.dequeue_task_fair 5.64 +0.3 5.99 ± 4% perf-profile.children.cycles-pp.update_curr 0.34 ± 9% +0.3 0.68 ± 11% perf-profile.children.cycles-pp.read 0.64 +0.4 1.06 perf-profile.children.cycles-pp.strnlen 1.38 ± 4% +0.4 1.81 ± 3% perf-profile.children.cycles-pp.perf_trace_sched_stat_runtime 1.30 ± 4% +0.4 1.73 ± 3% perf-profile.children.cycles-pp.do_perf_trace_sched_stat_runtime 3.76 ± 5% +0.5 4.24 ± 7% perf-profile.children.cycles-pp.update_se 36.56 +0.5 37.10 perf-profile.children.cycles-pp.schedule 1.01 ± 3% -0.2 0.86 ± 7% perf-profile.self.cycles-pp.try_to_wake_up 1.82 ± 4% -0.1 1.68 ± 6% perf-profile.self.cycles-pp.vfs_write 0.60 -0.1 0.52 ± 2% perf-profile.self.cycles-pp.put_prev_entity 3.18 -0.1 3.10 perf-profile.self.cycles-pp.intel_pmu_disable_all 0.28 ± 3% -0.1 0.20 ± 3% perf-profile.self.cycles-pp.__rdgsbase_inactive 1.54 -0.1 1.46 perf-profile.self.cycles-pp.__switch_to 0.25 -0.1 0.18 ± 4% perf-profile.self.cycles-pp.propagate_entity_load_avg 0.30 ± 4% -0.1 0.23 ± 3% perf-profile.self.cycles-pp._raw_spin_unlock_irqrestore 0.65 -0.1 0.58 ± 4% perf-profile.self.cycles-pp.security_file_permission 1.70 -0.1 1.64 perf-profile.self.cycles-pp.avg_vruntime 0.82 -0.1 0.76 perf-profile.self.cycles-pp.__perf_event_task_sched_in 0.31 ± 3% -0.1 0.25 ± 2% perf-profile.self.cycles-pp.__wake_up_common 0.96 -0.0 0.91 perf-profile.self.cycles-pp.__update_load_avg_cfs_rq 0.70 -0.0 0.65 ± 2% perf-profile.self.cycles-pp.__pick_eevdf 0.80 -0.0 0.75 ± 2% perf-profile.self.cycles-pp.anon_pipe_buf_release 0.56 ± 2% -0.0 0.52 ± 2% perf-profile.self.cycles-pp.vruntime_eligible 0.59 ± 2% -0.0 0.55 perf-profile.self.cycles-pp.native_sched_clock 0.50 -0.0 0.46 perf-profile.self.cycles-pp.update_rq_clock_task 0.53 -0.0 0.50 ± 2% perf-profile.self.cycles-pp.pick_task_fair 0.88 -0.0 0.85 perf-profile.self.cycles-pp._raw_spin_lock_irqsave 0.18 ± 3% -0.0 0.15 ± 3% perf-profile.self.cycles-pp.perf_cgroup_switch 0.67 ± 2% -0.0 0.64 ± 2% perf-profile.self.cycles-pp.entry_SYSCALL_64_safe_stack 0.11 ± 6% -0.0 0.08 perf-profile.self.cycles-pp.save_fpregs_to_fpstate 0.40 -0.0 0.37 ± 2% perf-profile.self.cycles-pp.__x64_sys_read 0.30 ± 3% -0.0 0.27 ± 5% perf-profile.self.cycles-pp.child 0.18 ± 5% -0.0 0.15 ± 4% perf-profile.self.cycles-pp.update_rq_clock 0.15 ± 3% -0.0 0.13 ± 5% perf-profile.self.cycles-pp.pick_next_task 0.08 ± 5% -0.0 0.07 ± 7% perf-profile.self.cycles-pp.enqueue_entity 0.16 ± 3% -0.0 0.14 ± 4% perf-profile.self.cycles-pp.dequeue_task 0.07 ± 6% +0.0 0.10 ± 5% perf-profile.self.cycles-pp.rb_next 0.07 ± 7% +0.0 0.09 ± 6% perf-profile.self.cycles-pp.raw_spin_rq_unlock 0.24 ± 3% +0.0 0.27 ± 2% perf-profile.self.cycles-pp.ksys_read 0.64 +0.0 0.67 ± 2% perf-profile.self.cycles-pp.os_xsave 0.12 ± 6% +0.0 0.15 ± 4% perf-profile.self.cycles-pp.enqueue_task 0.71 ± 2% +0.0 0.75 perf-profile.self.cycles-pp.pick_next_task_fair 0.55 +0.0 0.59 ± 2% perf-profile.self.cycles-pp.__enqueue_entity 0.02 ±141% +0.0 0.06 ± 9% perf-profile.self.cycles-pp.__x86_indirect_thunk_rdx 0.10 ± 15% +0.0 0.14 ± 12% perf-profile.self.cycles-pp.perf_swevent_event 0.45 ± 3% +0.0 0.50 ± 3% perf-profile.self.cycles-pp.switch_fpu_return 0.30 ± 3% +0.0 0.35 ± 2% perf-profile.self.cycles-pp.__x86_indirect_thunk_rax 0.46 +0.1 0.51 perf-profile.self.cycles-pp.dequeue_entities 0.06 ± 7% +0.1 0.13 ± 6% perf-profile.self.cycles-pp.kill_fasync 1.30 +0.1 1.37 perf-profile.self.cycles-pp.__switch_to_asm 0.38 ± 4% +0.1 0.46 ± 2% perf-profile.self.cycles-pp._copy_from_iter 0.80 ± 4% +0.1 0.89 ± 2% perf-profile.self.cycles-pp.prepare_task_switch 0.67 ± 2% +0.1 0.78 ± 3% perf-profile.self.cycles-pp.dequeue_entity 1.01 +0.1 1.11 perf-profile.self.cycles-pp.__update_load_avg_se 0.57 ± 2% +0.1 0.68 ± 2% perf-profile.self.cycles-pp.wakeup_preempt_fair 0.48 ± 2% +0.2 0.70 ± 2% perf-profile.self.cycles-pp.schedule 0.21 ± 7% +0.3 0.52 ± 5% perf-profile.self.cycles-pp.read 0.63 +0.4 1.05 perf-profile.self.cycles-pp.strnlen 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