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Date: Thu, 31 Jul 2014 09:38:19 -0700 From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> To: Mike Galbraith <umgwanakikbuti@...il.com> Cc: Peter Zijlstra <peterz@...radead.org>, linux-kernel@...r.kernel.org, mingo@...nel.org, laijs@...fujitsu.com, dipankar@...ibm.com, akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com, josh@...htriplett.org, tglx@...utronix.de, rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com, dvhart@...ux.intel.com, fweisbec@...il.com, oleg@...hat.com, bobby.prani@...il.com Subject: Re: [PATCH RFC tip/core/rcu 1/9] rcu: Add call_rcu_tasks() On Thu, Jul 31, 2014 at 09:37:08AM +0200, Mike Galbraith wrote: > On Wed, 2014-07-30 at 07:23 -0700, Paul E. McKenney wrote: > > > So the delta accounting is much of the pain. Hmmm... > > (overhead picture was incomplete, just fixing that...) Thank you again!!! And I have to ask... Does building with CONFIG_NO_HZ_FULL_SYSIDLE=y slow things down even more? If so, that would give me a rough idea of the cost of RCU's dyntick-idle handling. Thanx, Paul > executive summary: > nohz_full=NA cpu=3 604.2 KHz 1.000 > nohz_full=3, cpu=3 303.5 KHz .502 > nohz_full=3, cpu=2 460.4 KHz .761 > > boring details: > nohz_full=NA, pipe-test cpu=3 nohz_full=3, pipe-test cpu=3 nohz_full=3, pipe-test cpu=2 > 10.45% __schedule 8.74% native_sched_clock 9.22% __schedule > 10.03% system_call 5.63% __schedule 5.29% system_call > 4.86% _raw_spin_lock_irqsave 4.75% _raw_spin_lock 4.79% context_tracking_user_exit > 4.51% __switch_to 4.35% reschedule_interrupt 3.81% _raw_spin_lock_irqsave > 4.31% copy_user_generic_string 3.91% _raw_spin_unlock_irqrestore 3.57% __switch_to > 3.50% pipe_read 3.35% system_call 3.45% copy_user_generic_string > 3.02% pipe_write 2.73% context_tracking_user_exit 2.90% context_tracking_user_enter > 2.76% mutex_lock 2.30% _raw_spin_lock_irqsave 2.86% pipe_read > 2.30% native_sched_clock 2.08% context_tracking_user_enter 2.33% mutex_lock > 2.27% copy_page_to_iter_iovec 1.94% __switch_to 2.14% pipe_write > 2.16% mutex_unlock 1.88% copy_user_generic_string 1.89% copy_page_to_iter_iovec > 2.15% _raw_spin_unlock_irqrestore 1.80% account_system_time 1.88% tracesys > 1.86% copy_page_from_iter_iovec 1.77% rcu_eqs_enter_common.isra.42 1.78% native_sched_clock > 1.85% vfs_write 1.60% pipe_read 1.70% mutex_unlock > 1.67% new_sync_read 1.58% pipe_write 1.68% _raw_spin_unlock_irqrestore > 1.61% new_sync_write 1.39% mutex_lock 1.67% int_check_syscall_exit_work > 1.49% vfs_read 1.37% enqueue_task_fair 1.54% __context_tracking_task_switch > 1.47% fsnotify 1.25% rcu_eqs_exit_common.isra.43 1.39% copy_page_from_iter_iovec > 1.43% __fget_light 1.14% get_vtime_delta 1.38% new_sync_read > 1.36% enqueue_task_fair 1.11% flat_send_IPI_mask 1.38% __tick_nohz_task_switch > 1.28% finish_task_switch 1.07% tracesys 1.37% syscall_trace_leave > 1.26% dequeue_task_fair 1.03% dequeue_task_fair 1.35% vfs_write > 1.25% __sb_start_write 1.01% copy_page_to_iter_iovec 1.34% new_sync_write > 1.22% _raw_spin_lock_irq 1.01% int_check_syscall_exit_work 1.31% int_ret_from_sys_call > 1.20% try_to_wake_up 0.97% vfs_write 1.30% enqueue_task_fair > 1.16% update_curr 0.94% __context_tracking_task_switch 1.23% fsnotify > 1.05% __fsnotify_parent 0.93% mutex_unlock 1.22% finish_task_switch > 1.03% pick_next_task_fair 0.88% copy_page_from_iter_iovec 1.14% vfs_read > 1.02% sys_write 0.87% new_sync_write 1.12% _raw_spin_lock_irq > 1.01% sys_read 0.86% __fget_light 1.08% dequeue_task_fair > 1.00% __wake_up_sync_key 0.85% __sb_start_write 1.06% sys_read > 0.93% __wake_up_common 0.85% int_ret_from_sys_call 1.04% int_with_check > 0.92% copy_page_to_iter 0.83% syscall_trace_leave 1.02% update_curr > 0.90% check_preempt_wakeup 0.78% new_sync_read 0.99% syscall_trace_enter > 0.90% __srcu_read_lock 0.78% account_user_time 0.96% __fget_light > 0.89% put_prev_task_fair 0.76% update_curr 0.93% __sb_start_write > 0.88% copy_page_from_iter 0.74% fsnotify 0.89% copy_page_to_iter > 0.82% __sb_end_write 0.73% try_to_wake_up 0.87% try_to_wake_up > 0.76% __percpu_counter_add 0.71% finish_task_switch 0.86% check_preempt_wakeup > 0.74% prepare_to_wait 0.70% _raw_spin_lock_irq 0.86% sys_write > 0.72% touch_atime 0.69% __wake_up_sync_key 0.83% __fsnotify_parent > 0.71% pipe_wait 0.69% __tick_nohz_task_switch 0.81% __wake_up_sync_key > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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