Re: [patch] voluntary-preempt-2.6.9-rc1-bk4-Q9

[Thomas Charbonnel]

Ingo Molnar wrote :
> i've released the -Q9 patch:
> 
>   http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.9-rc1-bk4-Q9

With ACPI compiled in and booting with acpi=off (which again doesn't
seem to be honoured), here's another weird one :

preemption latency trace v1.0.5 on 2.6.9-rc1-VP-Q9
--------------------------------------------------
 latency: 2888 us, entries: 37 (37)
    -----------------
    | task: swapper/0, uid:0 nice:0 policy:0 rt_prio:0
    -----------------
 => started at: do_IRQ+0x19/0x1a0
 => ended at:   do_IRQ+0x14d/0x1a0
=======>
00010000 0.000ms (+0.000ms): do_IRQ (common_interrupt)
00010000 0.000ms (+0.000ms): do_IRQ (default_idle)
00010000 0.000ms (+0.000ms): do_IRQ (<00000000>)
00010001 0.000ms (+0.002ms): mask_and_ack_8259A (do_IRQ)
00010001 0.002ms (+0.000ms): generic_redirect_hardirq (do_IRQ)
00010000 0.002ms (+0.000ms): generic_handle_IRQ_event (do_IRQ)
00010000 0.003ms (+0.000ms): timer_interrupt (generic_handle_IRQ_event)
00010001 0.003ms (+2.878ms): mark_offset_tsc (timer_interrupt)
00010001 2.882ms (+0.000ms): do_timer (timer_interrupt)
00010001 2.882ms (+0.000ms): update_process_times (do_timer)
00010001 2.882ms (+0.000ms): update_one_process (update_process_times)
00010001 2.882ms (+0.000ms): run_local_timers (update_process_times)
00010001 2.882ms (+0.000ms): raise_softirq (update_process_times)
00010001 2.882ms (+0.000ms): scheduler_tick (update_process_times)
00010001 2.883ms (+0.000ms): sched_clock (scheduler_tick)
00010001 2.883ms (+0.000ms): update_wall_time (do_timer)
00010001 2.883ms (+0.000ms): update_wall_time_one_tick
(update_wall_time)
00010001 2.883ms (+0.000ms): profile_tick (timer_interrupt)
00010001 2.884ms (+0.000ms): profile_hook (profile_tick)
00010002 2.884ms (+0.000ms): notifier_call_chain (profile_hook)
00010001 2.884ms (+0.000ms): profile_hit (timer_interrupt)
00010001 2.884ms (+0.000ms): generic_note_interrupt (do_IRQ)
00010001 2.884ms (+0.000ms): end_8259A_irq (do_IRQ)
00010001 2.885ms (+0.000ms): enable_8259A_irq (do_IRQ)
00000001 2.886ms (+0.000ms): do_softirq (do_IRQ)
00000001 2.886ms (+0.000ms): __do_softirq (do_softirq)
00000001 2.886ms (+0.000ms): wake_up_process (do_softirq)
00000001 2.886ms (+0.000ms): try_to_wake_up (wake_up_process)
00000001 2.886ms (+0.000ms): task_rq_lock (try_to_wake_up)
00000002 2.886ms (+0.000ms): activate_task (try_to_wake_up)
00000002 2.886ms (+0.000ms): sched_clock (activate_task)
00000002 2.887ms (+0.000ms): recalc_task_prio (activate_task)
00000002 2.887ms (+0.000ms): effective_prio (recalc_task_prio)
00000002 2.887ms (+0.000ms): enqueue_task (activate_task)
00000001 2.887ms (+0.000ms): preempt_schedule (try_to_wake_up)
00000001 2.888ms (+0.000ms): sub_preempt_count (do_IRQ)
00000001 2.888ms (+0.000ms): update_max_trace (check_preempt_timing)

Thomas


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