Messages in this thread | | | Subject | Re: clock_nanosleep: cyclic POSIX thread freezes during time setting | Date | Wed, 7 Oct 2009 16:13:26 +0200 | From | "Mehlan, Markus" <> |
| |
Thomas Gleixner wrote: > I don't remember whether the older -rt kernels had ftrace support for > powerpc. > > Can you verify whether later -rt versions (29-rt or 31-rt) have the > same problem ? > > Thanks, > > tglx > I tried the ftrace (linux-2.6.26.8-rt16).
line 11347 in attached file: trace6.txt Is this a problem? <idle> 0 0 1 00000001 00002c49 [06b367e8] 42514.699ms (+2053.955ms): rcu_needs_cpu (tick_nohz_stop_sched_tick)
I created the file with: # echo verbose > /debug/tracing/iter_ctrl
When the "freeze" happened, I stopped the trace immediately and wrote the trace to the log file. # echo 0 > /debug/tracing/tracing_enabled # cat /debug/tracing/latency_trace > /home/trace6.txt
Regards, Markus
Hello Thomas,
please disgard the last mails, the trace was to large. (Message size exceeding 100 000 characters causes blocking.)
Extract of the trace: # tracer: ftrace # ftrace latency trace v1.1.5 on 2.6.26.8-rt16-el392 -------------------------------------------------------------------- latency: 0 us, #16425/12444805, CPU#0 | (M:preempt VP:0, KP:0, SP:0 HP:0) ----------------- | task: -0 (uid:0 nice:0 policy:0 rt_prio:0) -----------------
date 605 0 5 00000000 00000000 [06b2230d] 42431.537ms (+0.002ms): try_to_wake_up (wake_up_process) date 605 0 5 00000000 00000001 [06b2230f] 42431.539ms (+0.002ms): task_rq_lock (try_to_wake_up) date 605 0 5 00000000 00000002 [06b22311] 42431.541ms (+0.003ms): add_preempt_count (task_rq_lock)
...
<idle> 0 0 1 00000001 00002c40 [06b367c7] 42514.667ms (+0.006ms): getnstimeofday (ktime_get_ts) <idle> 0 0 1 00000001 00002c41 [06b367cd] 42514.673ms (+0.005ms): set_normalized_timespec (ktime_get_ts) <idle> 0 0 1 00000001 00002c42 [06b367d3] 42514.678ms (+0.002ms): get_next_timer_interrupt (tick_nohz_stop_sched_tick) <idle> 0 0 1 00000001 00002c43 [06b367d5] 42514.680ms (+0.002ms): rt_spin_trylock (get_next_timer_interrupt) <idle> 0 0 1 00000001 00002c44 [06b367d7] 42514.682ms (+0.007ms): rt_mutex_trylock (rt_spin_trylock) <idle> 0 0 1 00000001 00002c45 [06b367dd] 42514.689ms (+0.003ms): rt_spin_unlock (get_next_timer_interrupt) <idle> 0 0 1 00000001 00002c46 [06b367e0] 42514.692ms (+0.002ms): hrtimer_get_next_event (get_next_timer_interrupt) <idle> 0 0 1 00000001 00002c47 [06b367e2] 42514.694ms (+0.002ms): add_preempt_count (hrtimer_get_next_event) <idle> 0 0 1 00000002 00002c48 [06b367e5] 42514.696ms (+0.003ms): sub_preempt_count (hrtimer_get_next_event)
<idle> 0 0 1 00000001 00002c49 [06b367e8] 42514.699ms (+2053.955ms): rcu_needs_cpu (tick_nohz_stop_sched_tick)
<idle> 0 0 1 00000001 00002c4a [06d2bf2a] 44568.654ms (+0.002ms): do_IRQ (ret_from_except) <idle> 0 0 1 00000001 00002c4b [06d2bf2d] 44568.656ms (+0.002ms): irq_enter (do_IRQ) <idle> 0 0 1 00000001 00002c4c [06d2bf2f] 44568.658ms (+0.002ms): debug_smp_processor_id (irq_enter) <idle> 0 0 1 00000001 00002c4d [06d2bf31] 44568.660ms (+0.003ms): idle_cpu (irq_enter) <idle> 0 0 1 00000001 00002c4e [06d2bf34] 44568.663ms (+0.002ms): tick_nohz_stop_idle (irq_enter) <idle> 0 0 1 00000001 00002c4f [06d2bf36] 44568.666ms (+0.002ms): ktime_get (tick_nohz_stop_idle) <idle> 0 0 1 00000001 00002c50 [06d2bf38] 44568.668ms (+0.003ms): ktime_get_ts (ktime_get) <idle> 0 0 1 00000001 00002c51 [06d2bf3b] 44568.670ms (+0.002ms): getnstimeofday (ktime_get_ts) <idle> 0 0 1 00000001 00002c52 [06d2bf3d] 44568.673ms (+0.003ms): set_normalized_timespec (ktime_get_ts) <idle> 0 0 1 00000001 00002c53 [06d2bf40] 44568.675ms (+0.002ms): rcu_irq_enter (irq_enter) <idle> 0 0 1 00000001 00002c54 [06d2bf42] 44568.677ms (+0.003ms): debug_smp_processor_id (rcu_irq_enter) <idle> 0 0 1 00000001 00002c55 [06d2bf45] 44568.680ms (+0.002ms): add_preempt_count (irq_enter) <idle> 0 0 5 00000001 00002c56 [06d2bf47] 44568.682ms (+0.002ms): idle_cpu (irq_enter) <idle> 0 0 5 00000001 00002c57 [06d2bf48] 44568.684ms (+0.002ms): tick_nohz_update_jiffies (irq_enter) <idle> 0 0 5 00000001 00002c58 [06d2bf4a] 44568.686ms (+0.003ms): debug_smp_processor_id (tick_nohz_update_jiffies) <idle> 0 0 5 00000001 00002c59 [06d2bf4d] 44568.689ms (+0.003ms): mpc52xx_get_irq (do_IRQ)
Sitz der Gesellschaft: Oberhausen Handelsregister Amtsgericht Duisburg HRB-Nr. 17168 UST ID-Nr. DE 814009849 Geschaftsfuehrer: Manfred A. Wagner und Dr. Uwe Baader
| |