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SubjectRe: [patch] voluntary-preempt-2.6.8.1-P4
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Date
When logging into my Fedora Core 2 box on the console (normal vga text console),
I get the following latency trace:

(preempt=1 voluntary-preempt=3 elevator=cfq)


preemption latency trace v1.0.1
-------------------------------
latency: 3568 us, entries: 137 (137)
-----------------
| task: setfont/2209, uid:500 nice:0 policy:0 rt_prio:0
-----------------
=> started at: voluntary_resched+0x31/0x60
=> ended at: voluntary_resched+0x31/0x60
=======>
0.000ms (+0.000ms): touch_preempt_timing (voluntary_resched)
0.000ms (+0.000ms): vgacon_font_set (con_font_set)
0.000ms (+0.000ms): vgacon_do_font_op (vgacon_font_set)
0.057ms (+0.056ms): smp_apic_timer_interrupt (vgacon_do_font_op)
0.057ms (+0.000ms): profile_hook (smp_apic_timer_interrupt)
0.057ms (+0.000ms): notifier_call_chain (profile_hook)
0.120ms (+0.063ms): do_IRQ (vgacon_do_font_op)
0.121ms (+0.000ms): ack_edge_ioapic_irq (do_IRQ)
0.121ms (+0.000ms): generic_redirect_hardirq (do_IRQ)
0.121ms (+0.000ms): generic_handle_IRQ_event (do_IRQ)
0.121ms (+0.000ms): timer_interrupt (generic_handle_IRQ_event)
0.121ms (+0.000ms): mark_offset_pmtmr (timer_interrupt)
0.128ms (+0.006ms): do_timer (timer_interrupt)
0.128ms (+0.000ms): update_process_times (do_timer)
0.128ms (+0.000ms): update_one_process (update_process_times)
0.128ms (+0.000ms): run_local_timers (update_process_times)
0.128ms (+0.000ms): raise_softirq (update_process_times)
0.128ms (+0.000ms): scheduler_tick (update_process_times)
0.128ms (+0.000ms): sched_clock (scheduler_tick)
0.128ms (+0.000ms): rcu_check_callbacks (scheduler_tick)
0.128ms (+0.000ms): idle_cpu (rcu_check_callbacks)
0.129ms (+0.000ms): __tasklet_schedule (scheduler_tick)
0.129ms (+0.000ms): update_wall_time (do_timer)
0.129ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
0.129ms (+0.000ms): generic_note_interrupt (do_IRQ)
0.129ms (+0.000ms): end_edge_ioapic_irq (do_IRQ)
0.130ms (+0.000ms): do_softirq (do_IRQ)
0.130ms (+0.000ms): __do_softirq (do_softirq)
0.130ms (+0.000ms): wake_up_process (do_softirq)
0.130ms (+0.000ms): try_to_wake_up (wake_up_process)
0.130ms (+0.000ms): task_rq_lock (try_to_wake_up)
0.130ms (+0.000ms): activate_task (try_to_wake_up)
0.130ms (+0.000ms): sched_clock (activate_task)
0.130ms (+0.000ms): recalc_task_prio (activate_task)
0.130ms (+0.000ms): effective_prio (recalc_task_prio)
0.130ms (+0.000ms): enqueue_task (activate_task)
1.058ms (+0.927ms): smp_apic_timer_interrupt (vgacon_do_font_op)
1.058ms (+0.000ms): profile_hook (smp_apic_timer_interrupt)
1.058ms (+0.000ms): notifier_call_chain (profile_hook)
1.058ms (+0.000ms): preempt_schedule (smp_apic_timer_interrupt)
1.058ms (+0.000ms): do_softirq (smp_apic_timer_interrupt)
1.058ms (+0.000ms): __do_softirq (do_softirq)
1.122ms (+0.063ms): do_IRQ (vgacon_do_font_op)
1.122ms (+0.000ms): ack_edge_ioapic_irq (do_IRQ)
1.122ms (+0.000ms): generic_redirect_hardirq (do_IRQ)
1.122ms (+0.000ms): preempt_schedule (do_IRQ)
1.122ms (+0.000ms): generic_handle_IRQ_event (do_IRQ)
1.122ms (+0.000ms): timer_interrupt (generic_handle_IRQ_event)
1.123ms (+0.000ms): mark_offset_pmtmr (timer_interrupt)
1.129ms (+0.006ms): do_timer (timer_interrupt)
1.129ms (+0.000ms): update_process_times (do_timer)
1.129ms (+0.000ms): update_one_process (update_process_times)
1.129ms (+0.000ms): run_local_timers (update_process_times)
1.129ms (+0.000ms): raise_softirq (update_process_times)
1.129ms (+0.000ms): scheduler_tick (update_process_times)
1.129ms (+0.000ms): sched_clock (scheduler_tick)
1.129ms (+0.000ms): rcu_check_callbacks (scheduler_tick)
1.129ms (+0.000ms): idle_cpu (rcu_check_callbacks)
1.130ms (+0.000ms): update_wall_time (do_timer)
1.130ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
1.130ms (+0.000ms): generic_note_interrupt (do_IRQ)
1.130ms (+0.000ms): end_edge_ioapic_irq (do_IRQ)
1.130ms (+0.000ms): preempt_schedule (do_IRQ)
1.130ms (+0.000ms): do_softirq (do_IRQ)
1.130ms (+0.000ms): __do_softirq (do_softirq)
2.059ms (+0.928ms): smp_apic_timer_interrupt (vgacon_do_font_op)
2.059ms (+0.000ms): profile_hook (smp_apic_timer_interrupt)
2.059ms (+0.000ms): notifier_call_chain (profile_hook)
2.059ms (+0.000ms): preempt_schedule (smp_apic_timer_interrupt)
2.059ms (+0.000ms): do_softirq (smp_apic_timer_interrupt)
2.059ms (+0.000ms): __do_softirq (do_softirq)
2.123ms (+0.063ms): do_IRQ (vgacon_do_font_op)
2.123ms (+0.000ms): ack_edge_ioapic_irq (do_IRQ)
2.123ms (+0.000ms): generic_redirect_hardirq (do_IRQ)
2.123ms (+0.000ms): preempt_schedule (do_IRQ)
2.123ms (+0.000ms): generic_handle_IRQ_event (do_IRQ)
2.123ms (+0.000ms): timer_interrupt (generic_handle_IRQ_event)
2.123ms (+0.000ms): mark_offset_pmtmr (timer_interrupt)
2.130ms (+0.006ms): do_timer (timer_interrupt)
2.130ms (+0.000ms): update_process_times (do_timer)
2.130ms (+0.000ms): update_one_process (update_process_times)
2.130ms (+0.000ms): run_local_timers (update_process_times)
2.130ms (+0.000ms): raise_softirq (update_process_times)
2.130ms (+0.000ms): scheduler_tick (update_process_times)
2.130ms (+0.000ms): sched_clock (scheduler_tick)
2.130ms (+0.000ms): rcu_check_callbacks (scheduler_tick)
2.131ms (+0.000ms): idle_cpu (rcu_check_callbacks)
2.131ms (+0.000ms): dequeue_task (scheduler_tick)
2.131ms (+0.000ms): effective_prio (scheduler_tick)
2.131ms (+0.000ms): task_timeslice (scheduler_tick)
2.131ms (+0.000ms): enqueue_task (scheduler_tick)
2.131ms (+0.000ms): update_wall_time (do_timer)
2.131ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
2.131ms (+0.000ms): generic_note_interrupt (do_IRQ)
2.132ms (+0.000ms): end_edge_ioapic_irq (do_IRQ)
2.132ms (+0.000ms): preempt_schedule (do_IRQ)
2.132ms (+0.000ms): do_softirq (do_IRQ)
2.132ms (+0.000ms): __do_softirq (do_softirq)
3.060ms (+0.927ms): smp_apic_timer_interrupt (vgacon_do_font_op)
3.060ms (+0.000ms): profile_hook (smp_apic_timer_interrupt)
3.060ms (+0.000ms): notifier_call_chain (profile_hook)
3.060ms (+0.000ms): preempt_schedule (smp_apic_timer_interrupt)
3.060ms (+0.000ms): do_softirq (smp_apic_timer_interrupt)
3.060ms (+0.000ms): __do_softirq (do_softirq)
3.124ms (+0.063ms): do_IRQ (vgacon_do_font_op)
3.124ms (+0.000ms): ack_edge_ioapic_irq (do_IRQ)
3.124ms (+0.000ms): generic_redirect_hardirq (do_IRQ)
3.124ms (+0.000ms): preempt_schedule (do_IRQ)
3.124ms (+0.000ms): generic_handle_IRQ_event (do_IRQ)
3.124ms (+0.000ms): timer_interrupt (generic_handle_IRQ_event)
3.124ms (+0.000ms): mark_offset_pmtmr (timer_interrupt)
3.131ms (+0.006ms): do_timer (timer_interrupt)
3.131ms (+0.000ms): update_process_times (do_timer)
3.131ms (+0.000ms): update_one_process (update_process_times)
3.131ms (+0.000ms): run_local_timers (update_process_times)
3.131ms (+0.000ms): raise_softirq (update_process_times)
3.131ms (+0.000ms): scheduler_tick (update_process_times)
3.131ms (+0.000ms): sched_clock (scheduler_tick)
3.131ms (+0.000ms): rcu_check_callbacks (scheduler_tick)
3.131ms (+0.000ms): idle_cpu (rcu_check_callbacks)
3.131ms (+0.000ms): update_wall_time (do_timer)
3.131ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
3.132ms (+0.000ms): generic_note_interrupt (do_IRQ)
3.132ms (+0.000ms): end_edge_ioapic_irq (do_IRQ)
3.132ms (+0.000ms): preempt_schedule (do_IRQ)
3.132ms (+0.000ms): do_softirq (do_IRQ)
3.132ms (+0.000ms): __do_softirq (do_softirq)
3.485ms (+0.353ms): preempt_schedule (vgacon_do_font_op)
3.486ms (+0.000ms): vgacon_adjust_height (vgacon_font_set)
3.486ms (+0.000ms): release_console_sem (con_font_set)
3.486ms (+0.000ms): preempt_schedule (release_console_sem)
3.486ms (+0.000ms): kfree (con_font_set)
3.487ms (+0.000ms): copy_to_user (vt_ioctl)
3.487ms (+0.000ms): __might_sleep (copy_to_user)
3.487ms (+0.000ms): voluntary_resched (copy_to_user)
3.487ms (+0.000ms): __might_sleep (voluntary_resched)
3.487ms (+0.000ms): touch_preempt_timing (voluntary_resched)


$ cat /proc/interrupts
CPU0
0: 1286100 IO-APIC-edge timer
1: 4572 IO-APIC-edge i8042
8: 1 IO-APIC-edge rtc
9: 10 IO-APIC-level acpi
12: 86351 IO-APIC-edge i8042
14: 14089 IO-APIC-edge ide0
15: 477 IO-APIC-edge ide1
19: 13568 IO-APIC-level eth0
20: 94 IO-APIC-level ehci_hcd, ohci_hcd
21: 0 IO-APIC-level ohci_hcd
22: 593 IO-APIC-level NVidia nForce3
NMI: 0
LOC: 1286057
ERR: 0
MIS: 0


Machine is an ACER Aspire 1510 notebook
(AMD64 processor running a 32-bit kernel)
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