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    SubjectRe: [patch] voluntary-preempt-2.6.9-rc2-mm4-S7
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    On Sun, 2004-10-03 at 02:50, Lee Revell wrote:
    > On Sun, 2004-10-03 at 02:37, Lee Revell wrote:
    > > On Mon, 2004-09-27 at 20:05, Ingo Molnar wrote:
    > > > i've released the -S7 VP patch:
    > > >
    > > > http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.9-rc2-mm4-S7
    > > >
    > >
    > > This one was caused by amlat:
    >
    > And here's another produced by "lsof /foo":
    >

    Finally, there's this one which makes no sense to me:

    preemption latency trace v1.0.7 on 2.6.9-rc2-mm4-VP-S7
    -------------------------------------------------------
    latency: 507 us, entries: 45 (45) | [VP:1 KP:1 SP:1 HP:1 #CPUS:1]
    -----------------
    | task: events/0/3, uid:0 nice:-10 policy:0 rt_prio:0
    -----------------
    => started at: kernel_fpu_begin+0x15/0x70
    => ended at: _mmx_memcpy+0x13a/0x180
    =======>
    00000001 0.000ms (+0.002ms): kernel_fpu_begin (_mmx_memcpy)
    00010001 0.002ms (+0.000ms): do_IRQ (_mmx_memcpy)
    00010001 0.002ms (+0.000ms): do_IRQ (<00000000>)

    [ timer interrupt stuff ]

    00010001 0.024ms (+0.000ms): preempt_schedule (do_IRQ)
    00000002 0.025ms (+0.000ms): do_softirq (do_IRQ)
    00000002 0.025ms (+0.000ms): __do_softirq (do_softirq)
    00000002 0.025ms (+0.000ms): wake_up_process (do_softirq)
    00000002 0.026ms (+0.000ms): try_to_wake_up (wake_up_process)
    00000002 0.026ms (+0.000ms): task_rq_lock (try_to_wake_up)
    00000003 0.026ms (+0.000ms): activate_task (try_to_wake_up)
    00000003 0.027ms (+0.000ms): sched_clock (activate_task)
    00000003 0.027ms (+0.000ms): recalc_task_prio (activate_task)
    00000003 0.028ms (+0.000ms): effective_prio (recalc_task_prio)
    00000003 0.028ms (+0.000ms): enqueue_task (activate_task)
    00000002 0.028ms (+0.478ms): preempt_schedule (try_to_wake_up)
    00000001 0.507ms (+0.000ms): sub_preempt_count (_mmx_memcpy)
    00000001 0.508ms (+0.000ms): update_max_trace (check_preempt_timing)
    00000001 0.508ms (+0.000ms): _mmx_memcpy (update_max_trace)
    00000001 0.508ms (+0.000ms): kernel_fpu_begin (_mmx_memcpy)

    478 usecs in try_to_wake_up?

    Lee

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