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Date: Fri, 24 Apr 2009 00:02:33 +0200
From: Eric Dumazet <dada1@...mosbay.com>
To: Christoph Lameter <cl@...ux-foundation.org>,
"David S. Miller" <davem@...emloft.net>
CC: Linux Netdev List <netdev@...r.kernel.org>,
Michael Chan <mchan@...adcom.com>,
Ben Hutchings <bhutchings@...arflare.com>
Subject: about latencies
Hmmm
I think I might found something about these latencies...
An UDP frame is sent, queued to device (bnx2 for example)
Application calls recvfrom() to get next request and sleeps.
Some time later, NIC tells us TX was completed.
We free skb().
1) dst_release() (might dirty one cache line, that was increased by application cpu)
2) and more important... since UDP is now doing memory accounting...
sock_wfree()
-> sock_def_write_space()
-> _read_lock()
-> __wake_up_sync_key()
and lot of functions calls to wakeup the task, for nothing since it
will just schedule again. Lot of cache lines dirtied...
We could improve this.
1) dst_release at xmit time, should save a cache line ping-pong on general case
2) sock_wfree() in advance, done at transmit time (generally the thread/cpu doing the send)
3) changing bnx2_poll_work() to first call bnx2_rx_int(), then bnx2_tx_int() to consume tx.
What do you think ?
function ftrace of one "tx completion, extra wakeup, incoming udp, outgoing udp"
CPU0 : handles NIC interrupts
CPU1 : udpping process/application
<idle>-0 [000] 1647.998423: do_IRQ <-common_interrupt
<idle>-0 [000] 1647.998423: irq_enter <-do_IRQ
<idle>-0 [000] 1647.998423: rcu_irq_enter <-irq_enter
<idle>-0 [000] 1647.998423: idle_cpu <-irq_enter
<idle>-0 [000] 1647.998423: tick_check_idle <-irq_enter
<idle>-0 [000] 1647.998424: tick_check_oneshot_broadcast <-tick_check_idle
<idle>-0 [000] 1647.998424: tick_nohz_stop_idle <-tick_check_idle
<idle>-0 [000] 1647.998424: ktime_get <-tick_nohz_stop_idle
<idle>-0 [000] 1647.998424: ktime_get_ts <-ktime_get
<idle>-0 [000] 1647.998424: getnstimeofday <-ktime_get_ts
<idle>-0 [000] 1647.998425: set_normalized_timespec <-ktime_get_ts
<idle>-0 [000] 1647.998425: ktime_get <-sched_clock_tick
<idle>-0 [000] 1647.998425: ktime_get_ts <-ktime_get
<idle>-0 [000] 1647.998425: getnstimeofday <-ktime_get_ts
<idle>-0 [000] 1647.998426: set_normalized_timespec <-ktime_get_ts
<idle>-0 [000] 1647.998426: touch_softlockup_watchdog <-sched_clock_idle_wakeup_event
<idle>-0 [000] 1647.998426: handle_irq <-do_IRQ
<idle>-0 [000] 1647.998426: irq_to_desc <-handle_irq
<idle>-0 [000] 1647.998427: handle_edge_irq <-handle_irq
<idle>-0 [000] 1647.998427: _spin_lock <-handle_edge_irq
<idle>-0 [000] 1647.998427: ack_apic_edge <-handle_edge_irq
<idle>-0 [000] 1647.998427: irq_to_desc <-ack_apic_edge
<idle>-0 [000] 1647.998427: irq_complete_move <-ack_apic_edge
<idle>-0 [000] 1647.998428: move_native_irq <-ack_apic_edge
<idle>-0 [000] 1647.998428: irq_to_desc <-move_native_irq
<idle>-0 [000] 1647.998428: native_apic_mem_write <-ack_apic_edge
<idle>-0 [000] 1647.998428: handle_IRQ_event <-handle_edge_irq
<idle>-0 [000] 1647.998428: bnx2_msi <-handle_IRQ_event
<idle>-0 [000] 1647.998429: __napi_schedule <-bnx2_msi
<idle>-0 [000] 1647.998429: note_interrupt <-handle_edge_irq
<idle>-0 [000] 1647.998429: _spin_lock <-handle_edge_irq
<idle>-0 [000] 1647.998429: irq_exit <-do_IRQ
<idle>-0 [000] 1647.998429: do_softirq <-irq_exit
<idle>-0 [000] 1647.998430: __do_softirq <-do_softirq
<idle>-0 [000] 1647.998430: net_rx_action <-__do_softirq
<idle>-0 [000] 1647.998430: bnx2_poll <-net_rx_action
<idle>-0 [000] 1647.998430: bnx2_poll_work <-bnx2_poll
<idle>-0 [000] 1647.998431: skb_dma_unmap <-bnx2_poll_work
<idle>-0 [000] 1647.998431: consume_skb <-bnx2_poll_work
<idle>-0 [000] 1647.998431: __kfree_skb <-consume_skb
<idle>-0 [000] 1647.998432: skb_release_head_state <-__kfree_skb
<idle>-0 [000] 1647.998432: dst_release <-skb_release_head_state
<idle>-0 [000] 1647.998432: sock_wfree <-skb_release_head_state
<idle>-0 [000] 1647.998433: sock_def_write_space <-sock_wfree
<idle>-0 [000] 1647.998433: _read_lock <-sock_def_write_space
<idle>-0 [000] 1647.998433: __wake_up_sync_key <-sock_def_write_space
<idle>-0 [000] 1647.998433: _spin_lock_irqsave <-__wake_up_sync_key
<idle>-0 [000] 1647.998434: __wake_up_common <-__wake_up_sync_key
<idle>-0 [000] 1647.998434: autoremove_wake_function <-__wake_up_common
<idle>-0 [000] 1647.998434: default_wake_function <-autoremove_wake_function
<idle>-0 [000] 1647.998434: try_to_wake_up <-default_wake_function
<idle>-0 [000] 1647.998435: task_rq_lock <-try_to_wake_up
<idle>-0 [000] 1647.998435: _spin_lock <-task_rq_lock
<idle>-0 [000] 1647.998436: select_task_rq_fair <-try_to_wake_up
<idle>-0 [000] 1647.998436: activate_task <-try_to_wake_up
<idle>-0 [000] 1647.998436: enqueue_task <-activate_task
<idle>-0 [000] 1647.998437: enqueue_task_fair <-enqueue_task
<idle>-0 [000] 1647.998437: update_curr <-enqueue_task_fair
<idle>-0 [000] 1647.998437: place_entity <-enqueue_task_fair
<idle>-0 [000] 1647.998437: __enqueue_entity <-enqueue_task_fair
<idle>-0 [000] 1647.998438: hrtick_update <-enqueue_task_fair
<idle>-0 [000] 1647.998438: check_preempt_curr_idle <-try_to_wake_up
<idle>-0 [000] 1647.998438: resched_task <-check_preempt_curr_idle
<idle>-0 [000] 1647.998439: _spin_unlock_irqrestore <-try_to_wake_up
<idle>-0 [001] 1647.998439: tick_nohz_restart_sched_tick <-cpu_idle
<idle>-0 [001] 1647.998439: tick_nohz_stop_idle <-tick_nohz_restart_sched_tick
<idle>-0 [000] 1647.998439: _spin_unlock_irqrestore <-__wake_up_sync_key
<idle>-0 [001] 1647.998439: ktime_get <-tick_nohz_stop_idle
<idle>-0 [001] 1647.998439: ktime_get_ts <-ktime_get
<idle>-0 [000] 1647.998439: smp_apic_timer_interrupt <-apic_timer_interrupt
<idle>-0 [000] 1647.998440: native_apic_mem_write <-smp_apic_timer_interrupt
<idle>-0 [001] 1647.998440: getnstimeofday <-ktime_get_ts
<idle>-0 [001] 1647.998440: set_normalized_timespec <-ktime_get_ts
<idle>-0 [000] 1647.998440: irq_enter <-smp_apic_timer_interrupt
<idle>-0 [001] 1647.998440: ktime_get <-sched_clock_tick
<idle>-0 [001] 1647.998440: ktime_get_ts <-ktime_get
<idle>-0 [000] 1647.998440: rcu_irq_enter <-irq_enter
<idle>-0 [001] 1647.998441: getnstimeofday <-ktime_get_ts
<idle>-0 [000] 1647.998441: idle_cpu <-irq_enter
<idle>-0 [001] 1647.998441: set_normalized_timespec <-ktime_get_ts
<idle>-0 [000] 1647.998441: hrtimer_interrupt <-smp_apic_timer_interrupt
<idle>-0 [000] 1647.998441: ktime_get <-hrtimer_interrupt
<idle>-0 [000] 1647.998441: ktime_get_ts <-ktime_get
<idle>-0 [001] 1647.998441: touch_softlockup_watchdog <-sched_clock_idle_wakeup_event
<idle>-0 [000] 1647.998441: getnstimeofday <-ktime_get_ts
<idle>-0 [001] 1647.998441: rcu_exit_nohz <-tick_nohz_restart_sched_tick
<idle>-0 [000] 1647.998442: set_normalized_timespec <-ktime_get_ts
<idle>-0 [001] 1647.998442: select_nohz_load_balancer <-tick_nohz_restart_sched_tick
<idle>-0 [001] 1647.998442: ktime_get <-tick_nohz_restart_sched_tick
<idle>-0 [000] 1647.998442: _spin_lock <-hrtimer_interrupt
<idle>-0 [001] 1647.998442: ktime_get_ts <-ktime_get
<idle>-0 [000] 1647.998442: _spin_lock <-hrtimer_interrupt
<idle>-0 [001] 1647.998442: getnstimeofday <-ktime_get_ts
<idle>-0 [000] 1647.998442: __run_hrtimer <-hrtimer_interrupt
<idle>-0 [001] 1647.998443: set_normalized_timespec <-ktime_get_ts
<idle>-0 [000] 1647.998443: __remove_hrtimer <-__run_hrtimer
<idle>-0 [001] 1647.998443: tick_do_update_jiffies64 <-tick_nohz_restart_sched_tick
<idle>-0 [000] 1647.998443: timer_stats_update_stats <-__run_hrtimer
<idle>-0 [001] 1647.998443: _spin_lock <-tick_do_update_jiffies64
<idle>-0 [000] 1647.998443: tick_sched_timer <-__run_hrtimer
<idle>-0 [000] 1647.998443: ktime_get <-tick_sched_timer
<idle>-0 [001] 1647.998443: do_timer <-tick_do_update_jiffies64
<idle>-0 [000] 1647.998443: ktime_get_ts <-ktime_get
<idle>-0 [001] 1647.998444: update_wall_time <-do_timer
<idle>-0 [001] 1647.998444: clocksource_get_next <-update_wall_time
<idle>-0 [001] 1647.998444: _spin_lock_irqsave <-clocksource_get_next
<idle>-0 [001] 1647.998445: _spin_unlock_irqrestore <-clocksource_get_next
<idle>-0 [000] 1647.998445: getnstimeofday <-ktime_get_ts
<idle>-0 [001] 1647.998445: account_idle_ticks <-tick_nohz_restart_sched_tick
<idle>-0 [001] 1647.998446: account_idle_time <-account_idle_ticks
<idle>-0 [000] 1647.998446: set_normalized_timespec <-ktime_get_ts
<idle>-0 [001] 1647.998446: touch_softlockup_watchdog <-tick_nohz_restart_sched_tick
<idle>-0 [000] 1647.998446: update_process_times <-tick_sched_timer
<idle>-0 [001] 1647.998446: hrtimer_cancel <-tick_nohz_restart_sched_tick
<idle>-0 [000] 1647.998446: account_process_tick <-update_process_times
<idle>-0 [001] 1647.998446: hrtimer_try_to_cancel <-hrtimer_cancel
<idle>-0 [000] 1647.998446: account_idle_time <-account_process_tick
<idle>-0 [001] 1647.998447: lock_hrtimer_base <-hrtimer_try_to_cancel
<idle>-0 [000] 1647.998447: run_local_timers <-update_process_times
<idle>-0 [001] 1647.998447: _spin_lock_irqsave <-lock_hrtimer_base
<idle>-0 [000] 1647.998447: hrtimer_run_queues <-run_local_timers
<idle>-0 [001] 1647.998447: __remove_hrtimer <-hrtimer_try_to_cancel
<idle>-0 [000] 1647.998447: raise_softirq <-run_local_timers
<idle>-0 [001] 1647.998447: hrtimer_force_reprogram <-__remove_hrtimer
<idle>-0 [000] 1647.998447: softlockup_tick <-run_local_timers
<idle>-0 [001] 1647.998447: tick_program_event <-hrtimer_force_reprogram
<idle>-0 [000] 1647.998447: __touch_softlockup_watchdog <-softlockup_tick
<idle>-0 [001] 1647.998448: tick_dev_program_event <-tick_program_event
<idle>-0 [001] 1647.998448: ktime_get <-tick_dev_program_event
<idle>-0 [000] 1647.998448: rcu_pending <-update_process_times
<idle>-0 [001] 1647.998448: ktime_get_ts <-ktime_get
<idle>-0 [001] 1647.998448: getnstimeofday <-ktime_get_ts
<idle>-0 [000] 1647.998448: printk_tick <-update_process_times
<idle>-0 [000] 1647.998448: scheduler_tick <-update_process_times
<idle>-0 [001] 1647.998448: set_normalized_timespec <-ktime_get_ts
<idle>-0 [000] 1647.998449: ktime_get <-sched_clock_tick
<idle>-0 [001] 1647.998449: clockevents_program_event <-tick_dev_program_event
<idle>-0 [000] 1647.998449: ktime_get_ts <-ktime_get
<idle>-0 [001] 1647.998449: lapic_next_event <-clockevents_program_event
<idle>-0 [000] 1647.998449: getnstimeofday <-ktime_get_ts
<idle>-0 [001] 1647.998449: native_apic_mem_write <-lapic_next_event
<idle>-0 [000] 1647.998449: set_normalized_timespec <-ktime_get_ts
<idle>-0 [001] 1647.998449: _spin_unlock_irqrestore <-hrtimer_try_to_cancel
<idle>-0 [000] 1647.998449: _spin_lock <-scheduler_tick
<idle>-0 [001] 1647.998450: hrtimer_forward <-tick_nohz_restart_sched_tick
<idle>-0 [000] 1647.998450: task_tick_idle <-scheduler_tick
<idle>-0 [001] 1647.998450: hrtimer_start_range_ns <-tick_nohz_restart_sched_tick
<idle>-0 [001] 1647.998450: __hrtimer_start_range_ns <-hrtimer_start_range_ns
<idle>-0 [000] 1647.998450: run_posix_cpu_timers <-update_process_times
<idle>-0 [001] 1647.998450: lock_hrtimer_base <-__hrtimer_start_range_ns
<idle>-0 [000] 1647.998450: profile_tick <-tick_sched_timer
<idle>-0 [001] 1647.998450: _spin_lock_irqsave <-lock_hrtimer_base
<idle>-0 [001] 1647.998451: ktime_add_safe <-__hrtimer_start_range_ns
<idle>-0 [000] 1647.998451: hrtimer_forward <-tick_sched_timer
<idle>-0 [001] 1647.998451: enqueue_hrtimer <-__hrtimer_start_range_ns
<idle>-0 [000] 1647.998451: ktime_add_safe <-hrtimer_forward
<idle>-0 [000] 1647.998451: ktime_add_safe <-hrtimer_forward
<idle>-0 [001] 1647.998451: tick_program_event <-__hrtimer_start_range_ns
<idle>-0 [001] 1647.998451: tick_dev_program_event <-tick_program_event
<idle>-0 [000] 1647.998451: _spin_lock <-__run_hrtimer
<idle>-0 [001] 1647.998452: ktime_get <-tick_dev_program_event
<idle>-0 [000] 1647.998452: enqueue_hrtimer <-__run_hrtimer
<idle>-0 [001] 1647.998452: ktime_get_ts <-ktime_get
<idle>-0 [000] 1647.998452: tick_program_event <-hrtimer_interrupt
<idle>-0 [001] 1647.998452: getnstimeofday <-ktime_get_ts
<idle>-0 [000] 1647.998452: tick_dev_program_event <-tick_program_event
<idle>-0 [001] 1647.998452: set_normalized_timespec <-ktime_get_ts
<idle>-0 [000] 1647.998452: ktime_get <-tick_dev_program_event
<idle>-0 [001] 1647.998452: clockevents_program_event <-tick_dev_program_event
<idle>-0 [000] 1647.998452: ktime_get_ts <-ktime_get
<idle>-0 [001] 1647.998453: lapic_next_event <-clockevents_program_event
<idle>-0 [000] 1647.998453: getnstimeofday <-ktime_get_ts
<idle>-0 [001] 1647.998453: native_apic_mem_write <-lapic_next_event
<idle>-0 [000] 1647.998453: set_normalized_timespec <-ktime_get_ts
<idle>-0 [001] 1647.998453: _spin_unlock_irqrestore <-__hrtimer_start_range_ns
<idle>-0 [000] 1647.998453: clockevents_program_event <-tick_dev_program_event
<idle>-0 [001] 1647.998453: schedule <-cpu_idle
<idle>-0 [001] 1647.998453: __schedule <-schedule
<idle>-0 [000] 1647.998454: lapic_next_event <-clockevents_program_event
<idle>-0 [001] 1647.998454: rcu_qsctr_inc <-__schedule
<idle>-0 [000] 1647.998454: native_apic_mem_write <-lapic_next_event
<idle>-0 [000] 1647.998454: irq_exit <-smp_apic_timer_interrupt
<idle>-0 [001] 1647.998454: _spin_lock_irq <-__schedule
<idle>-0 [000] 1647.998454: rcu_irq_exit <-irq_exit
<idle>-0 [000] 1647.998454: idle_cpu <-irq_exit
<idle>-0 [001] 1647.998455: put_prev_task_idle <-__schedule
<idle>-0 [001] 1647.998455: pick_next_task_fair <-__schedule
<idle>-0 [000] 1647.998455: skb_release_data <-__kfree_skb
<idle>-0 [001] 1647.998455: __dequeue_entity <-pick_next_task_fair
<idle>-0 [000] 1647.998455: kfree <-skb_release_data
<idle>-0 [000] 1647.998456: __slab_free <-kfree
udpping-4847 [001] 1647.998456: finish_task_switch <-__schedule
<idle>-0 [000] 1647.998456: kmem_cache_free <-__kfree_skb
<idle>-0 [000] 1647.998456: __slab_free <-kmem_cache_free
udpping-4847 [001] 1647.998456: finish_wait <-__skb_recv_datagram
udpping-4847 [001] 1647.998457: _spin_lock_irqsave <-__skb_recv_datagram
udpping-4847 [001] 1647.998457: _spin_unlock_irqrestore <-__skb_recv_datagram
<idle>-0 [000] 1647.998457: __netdev_alloc_skb <-bnx2_poll_work
<idle>-0 [000] 1647.998457: __alloc_skb <-__netdev_alloc_skb
udpping-4847 [001] 1647.998457: prepare_to_wait_exclusive <-__skb_recv_datagram
<idle>-0 [000] 1647.998457: kmem_cache_alloc <-__alloc_skb
udpping-4847 [001] 1647.998457: _spin_lock_irqsave <-prepare_to_wait_exclusive
<idle>-0 [000] 1647.998458: __kmalloc_track_caller <-__alloc_skb
udpping-4847 [001] 1647.998458: _spin_unlock_irqrestore <-prepare_to_wait_exclusive
<idle>-0 [000] 1647.998458: get_slab <-__kmalloc_track_caller
<idle>-0 [000] 1647.998458: __slab_alloc <-__kmalloc_track_caller
udpping-4847 [001] 1647.998458: schedule_timeout <-__skb_recv_datagram
<idle>-0 [000] 1647.998458: deactivate_slab <-__slab_alloc
udpping-4847 [001] 1647.998458: schedule <-schedule_timeout
<idle>-0 [000] 1647.998459: _spin_lock <-__slab_alloc
udpping-4847 [001] 1647.998459: __schedule <-schedule
udpping-4847 [001] 1647.998459: rcu_qsctr_inc <-__schedule
udpping-4847 [001] 1647.998459: _spin_lock_irq <-__schedule
<idle>-0 [000] 1647.998459: nommu_map_page <-bnx2_poll_work
udpping-4847 [001] 1647.998459: deactivate_task <-__schedule
udpping-4847 [001] 1647.998460: dequeue_task <-deactivate_task
<idle>-0 [000] 1647.998460: skb_put <-bnx2_poll_work
udpping-4847 [001] 1647.998460: dequeue_task_fair <-dequeue_task
<idle>-0 [000] 1647.998460: eth_type_trans <-bnx2_poll_work
udpping-4847 [001] 1647.998460: update_curr <-dequeue_task_fair
<idle>-0 [000] 1647.998460: skb_pull <-eth_type_trans
udpping-4847 [001] 1647.998461: hrtick_update <-dequeue_task_fair
<idle>-0 [000] 1647.998461: __vlan_hwaccel_rx <-bnx2_poll_work
udpping-4847 [001] 1647.998461: msecs_to_jiffies <-__schedule
<idle>-0 [000] 1647.998461: netif_receive_skb <-__vlan_hwaccel_rx
udpping-4847 [001] 1647.998461: msecs_to_jiffies <-__schedule
<idle>-0 [000] 1647.998461: vlan_hwaccel_do_receive <-netif_receive_skb
udpping-4847 [001] 1647.998461: put_prev_task_fair <-__schedule
<idle>-0 [000] 1647.998461: netif_nit_deliver <-vlan_hwaccel_do_receive
udpping-4847 [001] 1647.998461: pick_next_task_fair <-__schedule
udpping-4847 [001] 1647.998462: pick_next_task_rt <-__schedule
<idle>-0 [000] 1647.998462: ip_rcv <-netif_receive_skb
udpping-4847 [001] 1647.998462: pick_next_task_fair <-__schedule
<idle>-0 [000] 1647.998462: nf_hook_slow <-ip_rcv
udpping-4847 [001] 1647.998462: pick_next_task_idle <-__schedule
<idle>-0 [000] 1647.998462: nf_iterate <-nf_hook_slow
<idle>-0 [000] 1647.998462: ip_rcv_finish <-ip_rcv
<idle>-0 [001] 1647.998462: finish_task_switch <-__schedule
<idle>-0 [000] 1647.998463: ip_route_input <-ip_rcv_finish
<idle>-0 [001] 1647.998463: tick_nohz_stop_sched_tick <-cpu_idle
<idle>-0 [001] 1647.998463: ktime_get <-tick_nohz_stop_sched_tick
<idle>-0 [000] 1647.998463: ip_local_deliver <-ip_rcv_finish
<idle>-0 [001] 1647.998463: ktime_get_ts <-ktime_get
<idle>-0 [000] 1647.998463: nf_hook_slow <-ip_local_deliver
<idle>-0 [001] 1647.998463: getnstimeofday <-ktime_get_ts
<idle>-0 [000] 1647.998463: nf_iterate <-nf_hook_slow
<idle>-0 [001] 1647.998464: set_normalized_timespec <-ktime_get_ts
<idle>-0 [000] 1647.998464: ipt_local_in_hook <-nf_iterate
<idle>-0 [001] 1647.998464: get_next_timer_interrupt <-tick_nohz_stop_sched_tick
<idle>-0 [000] 1647.998464: ipt_do_table <-ipt_local_in_hook
<idle>-0 [001] 1647.998464: _spin_lock <-get_next_timer_interrupt
<idle>-0 [000] 1647.998464: local_bh_disable <-ipt_do_table
<idle>-0 [000] 1647.998464: _read_lock <-ipt_do_table
<idle>-0 [000] 1647.998465: _read_unlock_bh <-ipt_do_table
<idle>-0 [000] 1647.998465: local_bh_enable_ip <-_read_unlock_bh
<idle>-0 [001] 1647.998465: hrtimer_get_next_event <-get_next_timer_interrupt
<idle>-0 [001] 1647.998465: _spin_lock_irqsave <-hrtimer_get_next_event
<idle>-0 [000] 1647.998465: ip_local_deliver_finish <-ip_local_deliver
<idle>-0 [001] 1647.998465: _spin_unlock_irqrestore <-hrtimer_get_next_event
<idle>-0 [000] 1647.998465: raw_local_deliver <-ip_local_deliver_finish
<idle>-0 [001] 1647.998466: rcu_needs_cpu <-tick_nohz_stop_sched_tick
<idle>-0 [000] 1647.998466: udp_rcv <-ip_local_deliver_finish
<idle>-0 [001] 1647.998466: printk_needs_cpu <-tick_nohz_stop_sched_tick
<idle>-0 [000] 1647.998466: __udp4_lib_rcv <-udp_rcv
<idle>-0 [001] 1647.998466: select_nohz_load_balancer <-tick_nohz_stop_sched_tick
<idle>-0 [000] 1647.998466: __udp4_lib_lookup <-__udp4_lib_rcv
<idle>-0 [000] 1647.998466: udp_queue_rcv_skb <-__udp4_lib_rcv
<idle>-0 [001] 1647.998466: rcu_enter_nohz <-tick_nohz_stop_sched_tick
<idle>-0 [001] 1647.998467: hrtimer_start <-tick_nohz_stop_sched_tick
<idle>-0 [000] 1647.998467: _spin_lock <-udp_queue_rcv_skb
<idle>-0 [001] 1647.998467: __hrtimer_start_range_ns <-hrtimer_start
<idle>-0 [000] 1647.998467: __udp_queue_rcv_skb <-udp_queue_rcv_skb
<idle>-0 [001] 1647.998467: lock_hrtimer_base <-__hrtimer_start_range_ns
<idle>-0 [000] 1647.998467: sock_queue_rcv_skb <-__udp_queue_rcv_skb
<idle>-0 [001] 1647.998467: _spin_lock_irqsave <-lock_hrtimer_base
<idle>-0 [000] 1647.998467: sk_filter <-sock_queue_rcv_skb
<idle>-0 [001] 1647.998467: __remove_hrtimer <-__hrtimer_start_range_ns
<idle>-0 [000] 1647.998467: local_bh_disable <-sk_filter
<idle>-0 [001] 1647.998468: hrtimer_force_reprogram <-__remove_hrtimer
<idle>-0 [000] 1647.998468: local_bh_enable <-sk_filter
<idle>-0 [001] 1647.998468: tick_program_event <-hrtimer_force_reprogram
<idle>-0 [001] 1647.998468: tick_dev_program_event <-tick_program_event
<idle>-0 [000] 1647.998468: skb_queue_tail <-sock_queue_rcv_skb
<idle>-0 [001] 1647.998468: ktime_get <-tick_dev_program_event
<idle>-0 [000] 1647.998468: _spin_lock_irqsave <-skb_queue_tail
<idle>-0 [001] 1647.998468: ktime_get_ts <-ktime_get
<idle>-0 [000] 1647.998469: _spin_unlock_irqrestore <-skb_queue_tail
<idle>-0 [001] 1647.998469: getnstimeofday <-ktime_get_ts
<idle>-0 [000] 1647.998469: sock_def_readable <-sock_queue_rcv_skb
<idle>-0 [001] 1647.998469: set_normalized_timespec <-ktime_get_ts
<idle>-0 [000] 1647.998469: _read_lock <-sock_def_readable
<idle>-0 [001] 1647.998469: clockevents_program_event <-tick_dev_program_event
<idle>-0 [001] 1647.998469: lapic_next_event <-clockevents_program_event
<idle>-0 [000] 1647.998469: __wake_up_sync_key <-sock_def_readable
<idle>-0 [001] 1647.998469: native_apic_mem_write <-lapic_next_event
<idle>-0 [000] 1647.998470: _spin_lock_irqsave <-__wake_up_sync_key
<idle>-0 [001] 1647.998470: ktime_add_safe <-__hrtimer_start_range_ns
<idle>-0 [000] 1647.998470: __wake_up_common <-__wake_up_sync_key
<idle>-0 [001] 1647.998470: enqueue_hrtimer <-__hrtimer_start_range_ns
<idle>-0 [000] 1647.998470: autoremove_wake_function <-__wake_up_common
<idle>-0 [001] 1647.998470: tick_program_event <-__hrtimer_start_range_ns
<idle>-0 [000] 1647.998470: default_wake_function <-autoremove_wake_function
<idle>-0 [001] 1647.998470: tick_dev_program_event <-tick_program_event
<idle>-0 [000] 1647.998471: try_to_wake_up <-default_wake_function
<idle>-0 [001] 1647.998471: ktime_get <-tick_dev_program_event
<idle>-0 [000] 1647.998471: task_rq_lock <-try_to_wake_up
<idle>-0 [001] 1647.998471: ktime_get_ts <-ktime_get
<idle>-0 [001] 1647.998471: getnstimeofday <-ktime_get_ts
<idle>-0 [000] 1647.998471: _spin_lock <-task_rq_lock
<idle>-0 [001] 1647.998471: set_normalized_timespec <-ktime_get_ts
<idle>-0 [001] 1647.998472: clockevents_program_event <-tick_dev_program_event
<idle>-0 [001] 1647.998472: lapic_next_event <-clockevents_program_event
<idle>-0 [001] 1647.998472: native_apic_mem_write <-lapic_next_event
<idle>-0 [000] 1647.998472: select_task_rq_fair <-try_to_wake_up
<idle>-0 [001] 1647.998472: _spin_unlock_irqrestore <-__hrtimer_start_range_ns
<idle>-0 [000] 1647.998472: activate_task <-try_to_wake_up
<idle>-0 [000] 1647.998473: enqueue_task <-activate_task
<idle>-0 [001] 1647.998473: mwait_idle <-cpu_idle
<idle>-0 [000] 1647.998473: enqueue_task_fair <-enqueue_task
<idle>-0 [000] 1647.998473: update_curr <-enqueue_task_fair
<idle>-0 [000] 1647.998473: place_entity <-enqueue_task_fair
<idle>-0 [000] 1647.998474: __enqueue_entity <-enqueue_task_fair
<idle>-0 [000] 1647.998474: hrtick_update <-enqueue_task_fair
<idle>-0 [000] 1647.998474: check_preempt_curr_idle <-try_to_wake_up
<idle>-0 [000] 1647.998474: resched_task <-check_preempt_curr_idle
<idle>-0 [000] 1647.998475: _spin_unlock_irqrestore <-try_to_wake_up
<idle>-0 [001] 1647.998475: tick_nohz_restart_sched_tick <-cpu_idle
<idle>-0 [001] 1647.998475: tick_nohz_stop_idle <-tick_nohz_restart_sched_tick
<idle>-0 [000] 1647.998475: _spin_unlock_irqrestore <-__wake_up_sync_key
<idle>-0 [001] 1647.998475: ktime_get <-tick_nohz_stop_idle
<idle>-0 [001] 1647.998476: ktime_get_ts <-ktime_get
<idle>-0 [000] 1647.998476: napi_complete <-bnx2_poll
<idle>-0 [001] 1647.998476: getnstimeofday <-ktime_get_ts
<idle>-0 [000] 1647.998476: napi_gro_flush <-napi_complete
<idle>-0 [001] 1647.998476: set_normalized_timespec <-ktime_get_ts
<idle>-0 [000] 1647.998476: __napi_complete <-napi_complete
<idle>-0 [001] 1647.998476: ktime_get <-sched_clock_tick
<idle>-0 [001] 1647.998476: ktime_get_ts <-ktime_get
<idle>-0 [000] 1647.998476: rcu_bh_qsctr_inc <-__do_softirq
<idle>-0 [001] 1647.998477: getnstimeofday <-ktime_get_ts
<idle>-0 [000] 1647.998477: run_timer_softirq <-__do_softirq
<idle>-0 [001] 1647.998477: set_normalized_timespec <-ktime_get_ts
<idle>-0 [000] 1647.998477: hrtimer_run_pending <-run_timer_softirq
<idle>-0 [000] 1647.998477: _spin_lock_irq <-run_timer_softirq
<idle>-0 [001] 1647.998477: touch_softlockup_watchdog <-sched_clock_idle_wakeup_event
<idle>-0 [000] 1647.998477: rcu_bh_qsctr_inc <-__do_softirq
<idle>-0 [000] 1647.998478: _local_bh_enable <-__do_softirq
<idle>-0 [001] 1647.998478: rcu_exit_nohz <-tick_nohz_restart_sched_tick
<idle>-0 [000] 1647.998478: rcu_irq_exit <-irq_exit
<idle>-0 [001] 1647.998478: select_nohz_load_balancer <-tick_nohz_restart_sched_tick
<idle>-0 [000] 1647.998478: idle_cpu <-irq_exit
<idle>-0 [000] 1647.998478: tick_nohz_stop_sched_tick <-irq_exit
<idle>-0 [001] 1647.998478: ktime_get <-tick_nohz_restart_sched_tick
<idle>-0 [000] 1647.998478: ktime_get <-tick_nohz_stop_sched_tick
<idle>-0 [001] 1647.998479: ktime_get_ts <-ktime_get
<idle>-0 [000] 1647.998479: ktime_get_ts <-ktime_get
<idle>-0 [001] 1647.998479: getnstimeofday <-ktime_get_ts
<idle>-0 [000] 1647.998479: getnstimeofday <-ktime_get_ts
<idle>-0 [001] 1647.998479: set_normalized_timespec <-ktime_get_ts
<idle>-0 [000] 1647.998479: set_normalized_timespec <-ktime_get_ts
<idle>-0 [001] 1647.998479: tick_do_update_jiffies64 <-tick_nohz_restart_sched_tick
<idle>-0 [000] 1647.998479: get_next_timer_interrupt <-tick_nohz_stop_sched_tick
<idle>-0 [001] 1647.998480: touch_softlockup_watchdog <-tick_nohz_restart_sched_tick
<idle>-0 [000] 1647.998480: _spin_lock <-get_next_timer_interrupt
<idle>-0 [001] 1647.998480: hrtimer_cancel <-tick_nohz_restart_sched_tick
<idle>-0 [001] 1647.998480: hrtimer_try_to_cancel <-hrtimer_cancel
<idle>-0 [000] 1647.998480: hrtimer_get_next_event <-get_next_timer_interrupt
<idle>-0 [001] 1647.998480: lock_hrtimer_base <-hrtimer_try_to_cancel
<idle>-0 [000] 1647.998480: _spin_lock_irqsave <-hrtimer_get_next_event
<idle>-0 [001] 1647.998480: _spin_lock_irqsave <-lock_hrtimer_base
<idle>-0 [000] 1647.998480: _spin_unlock_irqrestore <-hrtimer_get_next_event
<idle>-0 [001] 1647.998481: __remove_hrtimer <-hrtimer_try_to_cancel
<idle>-0 [000] 1647.998481: rcu_needs_cpu <-tick_nohz_stop_sched_tick
<idle>-0 [001] 1647.998481: hrtimer_force_reprogram <-__remove_hrtimer
<idle>-0 [001] 1647.998481: tick_program_event <-hrtimer_force_reprogram
<idle>-0 [000] 1647.998481: printk_needs_cpu <-tick_nohz_stop_sched_tick
<idle>-0 [001] 1647.998481: tick_dev_program_event <-tick_program_event
<idle>-0 [001] 1647.998481: ktime_get <-tick_dev_program_event
<idle>-0 [000] 1647.998481: select_nohz_load_balancer <-tick_nohz_stop_sched_tick
<idle>-0 [001] 1647.998482: ktime_get_ts <-ktime_get
<idle>-0 [001] 1647.998482: getnstimeofday <-ktime_get_ts
<idle>-0 [001] 1647.998482: set_normalized_timespec <-ktime_get_ts
<idle>-0 [000] 1647.998482: mwait_idle <-cpu_idle
<idle>-0 [001] 1647.998482: clockevents_program_event <-tick_dev_program_event
<idle>-0 [001] 1647.998483: lapic_next_event <-clockevents_program_event
<idle>-0 [001] 1647.998483: native_apic_mem_write <-lapic_next_event
<idle>-0 [001] 1647.998483: _spin_unlock_irqrestore <-hrtimer_try_to_cancel
<idle>-0 [001] 1647.998483: hrtimer_forward <-tick_nohz_restart_sched_tick
<idle>-0 [001] 1647.998484: hrtimer_start_range_ns <-tick_nohz_restart_sched_tick
<idle>-0 [001] 1647.998484: __hrtimer_start_range_ns <-hrtimer_start_range_ns
<idle>-0 [001] 1647.998484: lock_hrtimer_base <-__hrtimer_start_range_ns
<idle>-0 [001] 1647.998484: _spin_lock_irqsave <-lock_hrtimer_base
<idle>-0 [001] 1647.998485: ktime_add_safe <-__hrtimer_start_range_ns
<idle>-0 [001] 1647.998485: enqueue_hrtimer <-__hrtimer_start_range_ns
<idle>-0 [001] 1647.998485: tick_program_event <-__hrtimer_start_range_ns
<idle>-0 [001] 1647.998485: tick_dev_program_event <-tick_program_event
<idle>-0 [001] 1647.998486: ktime_get <-tick_dev_program_event
<idle>-0 [001] 1647.998486: ktime_get_ts <-ktime_get
<idle>-0 [001] 1647.998486: getnstimeofday <-ktime_get_ts
<idle>-0 [001] 1647.998486: set_normalized_timespec <-ktime_get_ts
<idle>-0 [001] 1647.998487: clockevents_program_event <-tick_dev_program_event
<idle>-0 [001] 1647.998487: lapic_next_event <-clockevents_program_event
<idle>-0 [001] 1647.998487: native_apic_mem_write <-lapic_next_event
<idle>-0 [001] 1647.998487: _spin_unlock_irqrestore <-__hrtimer_start_range_ns
<idle>-0 [001] 1647.998488: schedule <-cpu_idle
<idle>-0 [001] 1647.998488: __schedule <-schedule
<idle>-0 [001] 1647.998488: rcu_qsctr_inc <-__schedule
<idle>-0 [001] 1647.998488: _spin_lock_irq <-__schedule
<idle>-0 [001] 1647.998489: put_prev_task_idle <-__schedule
<idle>-0 [001] 1647.998489: pick_next_task_fair <-__schedule
<idle>-0 [001] 1647.998490: __dequeue_entity <-pick_next_task_fair
udpping-4847 [001] 1647.998490: finish_task_switch <-__schedule
udpping-4847 [001] 1647.998491: finish_wait <-__skb_recv_datagram
udpping-4847 [001] 1647.998491: _spin_lock_irqsave <-__skb_recv_datagram
udpping-4847 [001] 1647.998492: _spin_unlock_irqrestore <-__skb_recv_datagram
udpping-4847 [001] 1647.998492: skb_copy_datagram_iovec <-udp_recvmsg
udpping-4847 [001] 1647.998493: memcpy_toiovec <-skb_copy_datagram_iovec
udpping-4847 [001] 1647.998493: copy_to_user <-memcpy_toiovec
udpping-4847 [001] 1647.998494: lock_sock_nested <-udp_recvmsg
udpping-4847 [001] 1647.998494: _spin_lock_bh <-lock_sock_nested
udpping-4847 [001] 1647.998494: local_bh_disable <-_spin_lock_bh
udpping-4847 [001] 1647.998494: local_bh_enable <-lock_sock_nested
udpping-4847 [001] 1647.998495: skb_free_datagram <-udp_recvmsg
udpping-4847 [001] 1647.998495: consume_skb <-skb_free_datagram
udpping-4847 [001] 1647.998495: __kfree_skb <-consume_skb
udpping-4847 [001] 1647.998495: skb_release_head_state <-__kfree_skb
udpping-4847 [001] 1647.998496: dst_release <-skb_release_head_state
udpping-4847 [001] 1647.998496: sock_rfree <-skb_release_head_state
udpping-4847 [001] 1647.998496: skb_release_data <-__kfree_skb
udpping-4847 [001] 1647.998497: kfree <-skb_release_data
udpping-4847 [001] 1647.998497: __slab_free <-kfree
udpping-4847 [001] 1647.998497: kmem_cache_free <-__kfree_skb
udpping-4847 [001] 1647.998498: __slab_free <-kmem_cache_free
udpping-4847 [001] 1647.998498: release_sock <-udp_recvmsg
udpping-4847 [001] 1647.998498: _spin_lock_bh <-release_sock
udpping-4847 [001] 1647.998498: local_bh_disable <-_spin_lock_bh
udpping-4847 [001] 1647.998499: _spin_unlock_bh <-release_sock
udpping-4847 [001] 1647.998499: local_bh_enable_ip <-_spin_unlock_bh
udpping-4847 [001] 1647.998499: move_addr_to_user <-sys_recvfrom
udpping-4847 [001] 1647.998499: smp_apic_timer_interrupt <-apic_timer_interrupt
udpping-4847 [001] 1647.998500: native_apic_mem_write <-smp_apic_timer_interrupt
udpping-4847 [001] 1647.998500: irq_enter <-smp_apic_timer_interrupt
udpping-4847 [001] 1647.998500: rcu_irq_enter <-irq_enter
udpping-4847 [001] 1647.998500: idle_cpu <-irq_enter
udpping-4847 [001] 1647.998501: hrtimer_interrupt <-smp_apic_timer_interrupt
udpping-4847 [001] 1647.998501: ktime_get <-hrtimer_interrupt
udpping-4847 [001] 1647.998501: ktime_get_ts <-ktime_get
udpping-4847 [001] 1647.998501: getnstimeofday <-ktime_get_ts
udpping-4847 [001] 1647.998502: set_normalized_timespec <-ktime_get_ts
udpping-4847 [001] 1647.998502: _spin_lock <-hrtimer_interrupt
udpping-4847 [001] 1647.998502: _spin_lock <-hrtimer_interrupt
udpping-4847 [001] 1647.998502: __run_hrtimer <-hrtimer_interrupt
udpping-4847 [001] 1647.998503: __remove_hrtimer <-__run_hrtimer
udpping-4847 [001] 1647.998503: timer_stats_update_stats <-__run_hrtimer
udpping-4847 [001] 1647.998503: tick_sched_timer <-__run_hrtimer
udpping-4847 [001] 1647.998503: ktime_get <-tick_sched_timer
udpping-4847 [001] 1647.998503: ktime_get_ts <-ktime_get
udpping-4847 [001] 1647.998504: getnstimeofday <-ktime_get_ts
udpping-4847 [001] 1647.998504: set_normalized_timespec <-ktime_get_ts
udpping-4847 [001] 1647.998504: update_process_times <-tick_sched_timer
udpping-4847 [001] 1647.998504: account_process_tick <-update_process_times
udpping-4847 [001] 1647.998505: account_system_time <-account_process_tick
udpping-4847 [001] 1647.998505: run_local_timers <-update_process_times
udpping-4847 [001] 1647.998505: hrtimer_run_queues <-run_local_timers
udpping-4847 [001] 1647.998505: raise_softirq <-run_local_timers
udpping-4847 [001] 1647.998505: softlockup_tick <-run_local_timers
udpping-4847 [001] 1647.998506: __touch_softlockup_watchdog <-softlockup_tick
udpping-4847 [001] 1647.998506: rcu_pending <-update_process_times
udpping-4847 [001] 1647.998506: rcu_check_callbacks <-update_process_times
udpping-4847 [001] 1647.998506: idle_cpu <-rcu_check_callbacks
udpping-4847 [001] 1647.998507: raise_softirq <-rcu_check_callbacks
udpping-4847 [001] 1647.998507: printk_tick <-update_process_times
udpping-4847 [001] 1647.998507: scheduler_tick <-update_process_times
udpping-4847 [001] 1647.998507: ktime_get <-sched_clock_tick
udpping-4847 [001] 1647.998508: ktime_get_ts <-ktime_get
udpping-4847 [001] 1647.998508: getnstimeofday <-ktime_get_ts
udpping-4847 [001] 1647.998508: set_normalized_timespec <-ktime_get_ts
udpping-4847 [001] 1647.998508: _spin_lock <-scheduler_tick
udpping-4847 [001] 1647.998509: task_tick_fair <-scheduler_tick
udpping-4847 [001] 1647.998509: update_curr <-task_tick_fair
udpping-4847 [001] 1647.998509: run_posix_cpu_timers <-update_process_times
udpping-4847 [001] 1647.998510: profile_tick <-tick_sched_timer
udpping-4847 [001] 1647.998510: hrtimer_forward <-tick_sched_timer
udpping-4847 [001] 1647.998510: ktime_add_safe <-hrtimer_forward
udpping-4847 [001] 1647.998510: ktime_add_safe <-hrtimer_forward
udpping-4847 [001] 1647.998511: _spin_lock <-__run_hrtimer
udpping-4847 [001] 1647.998511: enqueue_hrtimer <-__run_hrtimer
udpping-4847 [001] 1647.998511: tick_program_event <-hrtimer_interrupt
udpping-4847 [001] 1647.998511: tick_dev_program_event <-tick_program_event
udpping-4847 [001] 1647.998512: ktime_get <-tick_dev_program_event
udpping-4847 [001] 1647.998512: ktime_get_ts <-ktime_get
udpping-4847 [001] 1647.998512: getnstimeofday <-ktime_get_ts
udpping-4847 [001] 1647.998512: set_normalized_timespec <-ktime_get_ts
udpping-4847 [001] 1647.998513: clockevents_program_event <-tick_dev_program_event
udpping-4847 [001] 1647.998513: lapic_next_event <-clockevents_program_event
udpping-4847 [001] 1647.998513: native_apic_mem_write <-lapic_next_event
udpping-4847 [001] 1647.998513: irq_exit <-smp_apic_timer_interrupt
udpping-4847 [001] 1647.998514: do_softirq <-irq_exit
udpping-4847 [001] 1647.998514: __do_softirq <-do_softirq
udpping-4847 [001] 1647.998514: run_timer_softirq <-__do_softirq
udpping-4847 [001] 1647.998514: hrtimer_run_pending <-run_timer_softirq
udpping-4847 [001] 1647.998515: _spin_lock_irq <-run_timer_softirq
udpping-4847 [001] 1647.998515: rcu_bh_qsctr_inc <-__do_softirq
udpping-4847 [001] 1647.998515: rcu_process_callbacks <-__do_softirq
udpping-4847 [001] 1647.998516: __rcu_process_callbacks <-rcu_process_callbacks
udpping-4847 [001] 1647.998516: cpu_quiet <-__rcu_process_callbacks
udpping-4847 [001] 1647.998516: _spin_lock_irqsave <-cpu_quiet
udpping-4847 [001] 1647.998517: cpu_quiet_msk <-cpu_quiet
udpping-4847 [001] 1647.998517: _spin_unlock_irqrestore <-cpu_quiet_msk
udpping-4847 [001] 1647.998517: __rcu_process_callbacks <-rcu_process_callbacks
udpping-4847 [001] 1647.998517: force_quiescent_state <-__rcu_process_callbacks
udpping-4847 [001] 1647.998518: cpu_quiet <-__rcu_process_callbacks
udpping-4847 [001] 1647.998518: _spin_lock_irqsave <-cpu_quiet
udpping-4847 [001] 1647.998518: _spin_unlock_irqrestore <-cpu_quiet
udpping-4847 [001] 1647.998518: rcu_bh_qsctr_inc <-__do_softirq
udpping-4847 [001] 1647.998519: _local_bh_enable <-__do_softirq
udpping-4847 [001] 1647.998519: rcu_irq_exit <-irq_exit
udpping-4847 [001] 1647.998519: idle_cpu <-irq_exit
udpping-4847 [001] 1647.998520: copy_to_user <-move_addr_to_user
udpping-4847 [001] 1647.998520: sys_socketcall <-sysenter_do_call
udpping-4847 [001] 1647.998520: copy_from_user <-sys_socketcall
udpping-4847 [001] 1647.998521: sys_sendto <-sys_socketcall
udpping-4847 [001] 1647.998521: sockfd_lookup_light <-sys_sendto
udpping-4847 [001] 1647.998521: fget_light <-sockfd_lookup_light
udpping-4847 [001] 1647.998521: move_addr_to_kernel <-sys_sendto
udpping-4847 [001] 1647.998522: copy_from_user <-move_addr_to_kernel
udpping-4847 [001] 1647.998522: sock_sendmsg <-sys_sendto
udpping-4847 [001] 1647.998522: inet_sendmsg <-sock_sendmsg
udpping-4847 [001] 1647.998522: udp_sendmsg <-inet_sendmsg
udpping-4847 [001] 1647.998523: sock_tx_timestamp <-udp_sendmsg
udpping-4847 [001] 1647.998523: ip_route_output_flow <-udp_sendmsg
udpping-4847 [001] 1647.998523: __ip_route_output_key <-ip_route_output_flow
udpping-4847 [001] 1647.998523: local_bh_disable <-__ip_route_output_key
udpping-4847 [001] 1647.998524: local_bh_enable <-__ip_route_output_key
udpping-4847 [001] 1647.998524: __xfrm_lookup <-ip_route_output_flow
udpping-4847 [001] 1647.998525: lock_sock_nested <-udp_sendmsg
udpping-4847 [001] 1647.998525: _spin_lock_bh <-lock_sock_nested
udpping-4847 [001] 1647.998525: local_bh_disable <-_spin_lock_bh
udpping-4847 [001] 1647.998526: local_bh_enable <-lock_sock_nested
udpping-4847 [001] 1647.998526: ip_append_data <-udp_sendmsg
udpping-4847 [001] 1647.998526: sock_alloc_send_skb <-ip_append_data
udpping-4847 [001] 1647.998527: sock_alloc_send_pskb <-sock_alloc_send_skb
udpping-4847 [001] 1647.998527: __alloc_skb <-sock_alloc_send_pskb
udpping-4847 [001] 1647.998527: kmem_cache_alloc <-__alloc_skb
udpping-4847 [001] 1647.998527: __kmalloc_track_caller <-__alloc_skb
udpping-4847 [001] 1647.998528: get_slab <-__kmalloc_track_caller
udpping-4847 [001] 1647.998528: skb_put <-ip_append_data
udpping-4847 [001] 1647.998528: ip_generic_getfrag <-ip_append_data
udpping-4847 [001] 1647.998529: csum_partial_copy_fromiovecend <-ip_generic_getfrag
udpping-4847 [001] 1647.998529: udp_push_pending_frames <-udp_sendmsg
udpping-4847 [001] 1647.998529: ip_push_pending_frames <-udp_push_pending_frames
udpping-4847 [001] 1647.998530: ip_local_out <-ip_push_pending_frames
udpping-4847 [001] 1647.998530: __ip_local_out <-ip_local_out
udpping-4847 [001] 1647.998530: nf_hook_slow <-__ip_local_out
udpping-4847 [001] 1647.998530: nf_iterate <-nf_hook_slow
udpping-4847 [001] 1647.998531: ipt_local_out_hook <-nf_iterate
udpping-4847 [001] 1647.998531: ipt_do_table <-ipt_local_out_hook
udpping-4847 [001] 1647.998531: local_bh_disable <-ipt_do_table
udpping-4847 [001] 1647.998531: _read_lock <-ipt_do_table
udpping-4847 [001] 1647.998532: _read_unlock_bh <-ipt_do_table
udpping-4847 [001] 1647.998532: local_bh_enable_ip <-_read_unlock_bh
udpping-4847 [001] 1647.998532: ip_output <-ip_local_out
udpping-4847 [001] 1647.998533: nf_hook_slow <-ip_output
udpping-4847 [001] 1647.998533: nf_iterate <-nf_hook_slow
udpping-4847 [001] 1647.998533: ip_finish_output <-ip_output
udpping-4847 [001] 1647.998533: skb_push <-ip_finish_output
udpping-4847 [001] 1647.998534: dev_queue_xmit <-ip_finish_output
udpping-4847 [001] 1647.998534: local_bh_disable <-dev_queue_xmit
udpping-4847 [001] 1647.998534: _spin_lock <-dev_queue_xmit
udpping-4847 [001] 1647.998534: pfifo_fast_enqueue <-dev_queue_xmit
udpping-4847 [001] 1647.998534: __qdisc_run <-dev_queue_xmit
udpping-4847 [001] 1647.998535: pfifo_fast_dequeue <-__qdisc_run
udpping-4847 [001] 1647.998535: _spin_lock <-__qdisc_run
udpping-4847 [001] 1647.998535: dev_hard_start_xmit <-__qdisc_run
udpping-4847 [001] 1647.998535: vlan_dev_hwaccel_hard_start_xmit <-dev_hard_start_xmit
udpping-4847 [001] 1647.998536: dev_queue_xmit <-vlan_dev_hwaccel_hard_start_xmit
udpping-4847 [001] 1647.998536: local_bh_disable <-dev_queue_xmit
udpping-4847 [001] 1647.998536: dev_hard_start_xmit <-dev_queue_xmit
udpping-4847 [001] 1647.998536: bond_start_xmit <-dev_hard_start_xmit
udpping-4847 [001] 1647.998537: _read_lock <-bond_start_xmit
udpping-4847 [001] 1647.998537: _read_lock <-bond_start_xmit
udpping-4847 [001] 1647.998537: bond_dev_queue_xmit <-bond_start_xmit
udpping-4847 [001] 1647.998537: dev_queue_xmit <-bond_dev_queue_xmit
udpping-4847 [001] 1647.998537: local_bh_disable <-dev_queue_xmit
udpping-4847 [001] 1647.998538: _spin_lock <-dev_queue_xmit
udpping-4847 [001] 1647.998538: pfifo_fast_enqueue <-dev_queue_xmit
udpping-4847 [001] 1647.998538: __qdisc_run <-dev_queue_xmit
udpping-4847 [001] 1647.998539: pfifo_fast_dequeue <-__qdisc_run
udpping-4847 [001] 1647.998539: _spin_lock <-__qdisc_run
udpping-4847 [001] 1647.998539: dev_hard_start_xmit <-__qdisc_run
udpping-4847 [001] 1647.998539: bnx2_start_xmit <-dev_hard_start_xmit
udpping-4847 [001] 1647.998540: skb_dma_map <-bnx2_start_xmit
udpping-4847 [001] 1647.998540: nommu_map_page <-skb_dma_map
udpping-4847 [001] 1647.998541: _spin_lock <-__qdisc_run
udpping-4847 [001] 1647.998541: local_bh_enable <-dev_queue_xmit
udpping-4847 [001] 1647.998541: local_bh_enable <-dev_queue_xmit
udpping-4847 [001] 1647.998542: _spin_lock <-__qdisc_run
udpping-4847 [001] 1647.998542: local_bh_enable <-dev_queue_xmit
udpping-4847 [001] 1647.998542: ip_cork_release <-ip_push_pending_frames
udpping-4847 [001] 1647.998542: kfree <-ip_cork_release
udpping-4847 [001] 1647.998543: dst_release <-ip_cork_release
udpping-4847 [001] 1647.998543: release_sock <-udp_sendmsg
udpping-4847 [001] 1647.998543: _spin_lock_bh <-release_sock
udpping-4847 [001] 1647.998543: local_bh_disable <-_spin_lock_bh
udpping-4847 [001] 1647.998543: _spin_unlock_bh <-release_sock
udpping-4847 [001] 1647.998544: local_bh_enable_ip <-_spin_unlock_bh
udpping-4847 [001] 1647.998544: sys_socketcall <-sysenter_do_call
udpping-4847 [001] 1647.998544: copy_from_user <-sys_socketcall
udpping-4847 [001] 1647.998545: sys_recvfrom <-sys_socketcall
udpping-4847 [001] 1647.998545: sockfd_lookup_light <-sys_recvfrom
udpping-4847 [001] 1647.998545: fget_light <-sockfd_lookup_light
udpping-4847 [001] 1647.998545: sock_recvmsg <-sys_recvfrom
udpping-4847 [001] 1647.998545: sock_common_recvmsg <-sock_recvmsg
udpping-4847 [001] 1647.998546: udp_recvmsg <-sock_common_recvmsg
udpping-4847 [001] 1647.998546: __skb_recv_datagram <-udp_recvmsg
udpping-4847 [001] 1647.998546: _spin_lock_irqsave <-__skb_recv_datagram
udpping-4847 [001] 1647.998546: _spin_unlock_irqrestore <-__skb_recv_datagram
udpping-4847 [001] 1647.998547: prepare_to_wait_exclusive <-__skb_recv_datagram
udpping-4847 [001] 1647.998547: _spin_lock_irqsave <-prepare_to_wait_exclusive
udpping-4847 [001] 1647.998547: _spin_unlock_irqrestore <-prepare_to_wait_exclusive
udpping-4847 [001] 1647.998547: schedule_timeout <-__skb_recv_datagram
udpping-4847 [001] 1647.998547: schedule <-schedule_timeout
udpping-4847 [001] 1647.998548: __schedule <-schedule
udpping-4847 [001] 1647.998548: rcu_qsctr_inc <-__schedule
udpping-4847 [001] 1647.998548: _spin_lock_irq <-__schedule
udpping-4847 [001] 1647.998548: deactivate_task <-__schedule
udpping-4847 [001] 1647.998549: dequeue_task <-deactivate_task
udpping-4847 [001] 1647.998549: dequeue_task_fair <-dequeue_task
udpping-4847 [001] 1647.998549: update_curr <-dequeue_task_fair
udpping-4847 [001] 1647.998550: hrtick_update <-dequeue_task_fair
udpping-4847 [001] 1647.998550: msecs_to_jiffies <-__schedule
udpping-4847 [001] 1647.998550: msecs_to_jiffies <-__schedule
udpping-4847 [001] 1647.998550: put_prev_task_fair <-__schedule
udpping-4847 [001] 1647.998550: pick_next_task_fair <-__schedule
udpping-4847 [001] 1647.998551: pick_next_task_rt <-__schedule
udpping-4847 [001] 1647.998551: pick_next_task_fair <-__schedule
udpping-4847 [001] 1647.998551: pick_next_task_idle <-__schedule
--
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