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
>
>
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