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Message-ID: <1406792228.6348.22.camel@marge.simpson.net>
Date: Thu, 31 Jul 2014 09:37:08 +0200
From: Mike Galbraith <umgwanakikbuti@...il.com>
To: paulmck@...ux.vnet.ibm.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 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...)
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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