On Fri, 2005-10-07 at 10:47 -0700, Mark Knecht wrote:
> On 10/7/05, Lee Revell <[email protected]> wrote:
> > On Fri, 2005-10-07 at 09:44 -0700, Mark Knecht wrote:
> > > Hi Ingo,
> > > OK, I've been running -rt10 for the last couple of hours on a new
> > > kernel without SMP. No xruns so far at 64/2. I'm doing all the normal
> > > stuff. emerge sync, building some code outside of portage, playing
> > > music. Very good so far, but it will likely take 4-6 hours for me to
> > > be more sure saying it was just SMP latencies.
> >
> > IIRC you posted some traces that implied the migration thread was
> > involved.
> >
> > Lee
>
> No Lee, I don't think I've posted any traces myself. Possibly someone else?
>
I was thinking of this trace that Fernando posted on 9/26 in the LKML
thread "jack, PREEMPT_DESKTOP, delayed interrupts?". Note move_tasks
and load_balance_newidle near the end. I never saw an explanation of
this:
# cat /proc/latency_trace
preemption latency trace v1.1.5 on 2.6.13-0.3.rdtd.rhfc4.ccrmasmp
--------------------------------------------------------------------
latency: 10852 us, #70/70, CPU#0 | (M:preempt VP:0, KP:1, SP:1 HP:1
#P:2)
-----------------
| task: qjackctl-4797 (uid:743 nice:0 policy:1 rt_prio:61)
-----------------
_------=> CPU#
/ _-----=> irqs-off
| / _----=> need-resched
|| / _---=> hardirq/softirq
||| / _--=> preempt-depth
|||| /
||||| delay
cmd pid ||||| time | caller
\ / ||||| \ | /
<...>-4593 1Dnh3 0us : MacPrivateStat (SkPnmiGetStruct)
<...>-4593 1Dnh3 0us : MacPrivateStat (SkPnmiGetStruct)
<...>-4593 1Dnh3 0us : MacUpdate (MacPrivateStat)
<...>-4593 1Dnh3 0us : GetStatVal (MacPrivateStat)
<...>-4593 1Dnh3 0us : GetPhysStatVal (GetStatVal)
<...>-4593 1Dnh3 1us+: SkGmMacStatistic (GetPhysStatVal)
<...>-4593 1Dnh3 3us : MacPrivateStat (SkPnmiGetStruct)
<...>-4593 1Dnh3 3us : MacUpdate (MacPrivateStat)
<...>-4593 1Dnh3 3us : GetStatVal (MacPrivateStat)
<...>-4593 1Dnh3 3us : GetPhysStatVal (GetStatVal)
<...>-4593 1Dnh3 3us+: SkGmMacStatistic (GetPhysStatVal)
<...>-4593 1Dnh3 5us : MacPrivateStat (SkPnmiGetStruct)
<...>-4593 1Dnh3 6us : MacPrivateStat (SkPnmiGetStruct)
<...>-4593 1Dnh3 6us : MacUpdate (MacPrivateStat)
<...>-4593 1Dnh3 6us : GetStatVal (MacPrivateStat)
<...>-4593 1Dnh3 6us : GetPhysStatVal (GetStatVal)
<...>-4593 1Dnh3 6us+: SkGmMacStatistic (GetPhysStatVal)
<...>-4593 1Dnh3 8us : MacPrivateStat (SkPnmiGetStruct)
<...>-4593 1Dnh3 9us : MacUpdate (MacPrivateStat)
<...>-4593 1Dnh3 9us : GetStatVal (MacPrivateStat)
<...>-4593 1Dnh3 9us : GetPhysStatVal (GetStatVal)
<...>-4593 1Dnh3 9us+: SkGmMacStatistic (GetPhysStatVal)
<...>-4593 1Dnh3 11us : MacPrivateStat (SkPnmiGetStruct)
<...>-4593 1Dnh3 11us : MacPrivateStat (SkPnmiGetStruct)
<...>-4593 1Dnh3 12us : MacUpdate (MacPrivateStat)
<...>-4593 1Dnh3 12us : GetStatVal (MacPrivateStat)
<...>-4593 1Dnh3 12us : GetPhysStatVal (GetStatVal)
<...>-4593 1Dnh3 12us : MacPrivateStat (SkPnmiGetStruct)
<...>-4593 1Dnh3 12us : MacUpdate (MacPrivateStat)
<...>-4593 1Dnh3 12us : GetStatVal (MacPrivateStat)
<...>-4593 1Dnh3 13us : GetPhysStatVal (GetStatVal)
<...>-4593 1Dnh3 13us : MacPrivateStat (SkPnmiGetStruct)
<...>-4593 1Dnh3 13us : MacPrivateStat (SkPnmiGetStruct)
<...>-4593 1Dnh3 13us : MacUpdate (MacPrivateStat)
<...>-4593 1Dnh3 13us : GetStatVal (MacPrivateStat)
<...>-4593 1Dnh3 13us : GetPhysStatVal (GetStatVal)
<...>-4593 1Dnh3 13us : MacPrivateStat (SkPnmiGetStruct)
<...>-4593 1Dnh3 13us : MacUpdate (MacPrivateStat)
<...>-4593 1Dnh3 13us : GetStatVal (MacPrivateStat)
<...>-4593 1Dnh3 14us : GetPhysStatVal (GetStatVal)
<...>-4593 1Dnh3 14us : MacPrivateStat (SkPnmiGetStruct)
<...>-4593 1Dnh3 14us : MacPrivateStat (SkPnmiGetStruct)
<...>-4593 1Dnh3 14us : MacUpdate (MacPrivateStat)
<...>-4593 1Dnh3 14us : GetStatVal (MacPrivateStat)
<...>-4593 1Dnh3 14us : GetPhysStatVal (GetStatVal)
<...>-4593 1Dnh3 14us+: SkGmMacStatistic (GetPhysStatVal)
<...>-4593 1Dnh3 17us : GetStatVal (MacPrivateStat)
<...>-4593 1Dnh3 18us : GetPhysStatVal (GetStatVal)
<...>-4593 1Dnh3 18us : SkGmMacStatistic (GetPhysStatVal)
<...>-4593 1Dnh3 20us : GetStatVal (MacPrivateStat)
<...>-4593 1Dnh3 20us : GetPhysStatVal (GetStatVal)
<...>-4593 1Dnh3 20us+: SkGmMacStatistic (GetPhysStatVal)
<...>-4593 1Dnh3 22us : GetStatVal (MacPrivateStat)
<...>-4593 1Dnh3 22us : GetPhysStatVal (GetStatVal)
<...>-4593 1Dnh3 22us+: SkGmMacStatistic (GetPhysStatVal)
<...>-4593 1Dnh3 24us!: MacPrivateStat (SkPnmiGetStruct)
softirq--8 0Dnh4 9901us : trace_change_sched_cpu (1 0 0)
softirq--8 0Dnh4 9901us : _raw_spin_unlock (trace_change_sched_cpu)
softirq--8 0Dnh3 9902us : enqueue_task (move_tasks)
softirq--8 0Dnh3 9902us : resched_task (move_tasks)
softirq--8 0Dnh3 9902us : _raw_spin_unlock (load_balance_newidle)
softirq--8 0Dnh2 9902us : preempt_schedule (_raw_spin_unlock)
<...>-4797 0Dnh2 9903us : __switch_to (__schedule)
<...>-4797 0Dnh2 9904us : __schedule <softirq--8> (62 26)
<...>-4797 0Dnh2 9904us : _raw_spin_unlock_irq (__schedule)
<...>-4797 0...1 9904us : trace_stop_sched_switched (__schedule)
<...>-4797 0Dnh1 9905us : _raw_spin_lock (trace_stop_sched_switched)
<...>-4797 0Dnh2 9905us : trace_stop_sched_switched <<...>-4797> (26
0)
<...>-4797 0Dnh2 9905us : trace_stop_sched_switched (__schedule)
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