Thomas Gleixner wrote:
Please bzip2 it and upload it somewhere as it's probably too large for
the mailinglist.
Please find 3 realizations at:
http://www.proyectoradio.com/webdocs/rtkernel/trace.bz2
http://www.proyectoradio.com/webdocs/rtkernel/trace2.bz2
http://www.proyectoradio.com/webdocs/rtkernel/trace3.bz2
Just in case they get lost sometime in the future, at the end of this
email is the result of "tail -30 trace3", hopefully it is enough of that
file.
Having read the three of them, regardless of the last process before the
"NOHZ...", there is always a call to the FPE emulator. I am going to do
some tests changing the FPE emulator, in case it helps.
Thanks a lot,
Iratxo.
Thanks,
tglx
-------------->
Subject: debug-nohz-issue.patch
From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Date: Thu, 18 Jun 2009 01:41:01 +0200
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
kernel/time/tick-sched.c | 2 ++
1 file changed, 2 insertions(+)
Index: linux-2.6-tip/kernel/time/tick-sched.c
===================================================================
--- linux-2.6-tip.orig/kernel/time/tick-sched.c
+++ linux-2.6-tip/kernel/time/tick-sched.c
@@ -250,6 +250,8 @@ void tick_nohz_stop_sched_tick(int inidl
if (unlikely(local_softirq_pending() && cpu_online(cpu))) {
static int ratelimit;
+ tracing_off();
+
if (ratelimit < 10) {
printk(KERN_ERR "NOHZ: local_softirq_pending %02x\n",
local_softirq_pending());
sh-1162 [000] 4154504576.502616: n_tty_set_room <-n_tty_read
sh-1162 [000] 4154504576.502616: schedule_timeout
<-n_tty_read
sh-1162 [000] 4154504576.502616: schedule <-schedule_timeout
sh-1162 [000] 4154504576.502616: __schedule <-schedule
sh-1162 [000] 4154504576.502616: rcu_qsctr_inc <-__schedule
sh-1162 [000] 4154504576.502616: deactivate_task <-__schedule
sh-1162 [000] 4154504576.502616: dequeue_task
<-deactivate_task
sh-1162 [000] 4154504576.502616: update_avg <-dequeue_task
sh-1162 [000] 4154504576.502616: dequeue_task_fair
<-dequeue_task
sh-1162 [000] 4154504576.502616: update_curr
<-dequeue_task_fair
sh-1162 [000] 4154504576.502616: clear_buddies
<-dequeue_task_fair
sh-1162 [000] 4154504576.502616: __clear_buddies
<-clear_buddies
sh-1162 [000] 4154504576.502616: update_min_vruntime
<-dequeue_task_fair
sh-1162 [000] 4154504576.502616: put_prev_task_fair
<-__schedule
sh-1162 [000] 4154504576.502616: check_spread
<-put_prev_task_fair
sh-1162 [000] 4154504576.502616: pick_next_task_rt
<-__schedule
sh-1162 [000] 4154504576.502616: pick_next_task_fair
<-__schedule
sh-1162 [000] 4154504576.502616: pick_next_task_idle
<-__schedule
sh-1162 [000] 4154504576.502616: calc_load_account_active
<-pick_next_task_idle
sh-1162 [000] 4154504576.502616: __rcu_read_lock
<-__atomic_notifier_call_chain
sh-1162 [000] 4154504576.502616: nwfpe_notify
<-notifier_call_chain
sh-1162 [000] 4154504576.502616: dsp_do <-notifier_call_chain
sh-1162 [000] 4154504576.502616: __rcu_read_unlock
<-__atomic_notifier_call_chain
<idle>-0 [000] 4154504576.502616: finish_task_switch
<-__schedule
<idle>-0 [000] 4154504576.502616:
tick_nohz_stop_sched_tick <-cpu_idle
<idle>-0 [000] 4154504576.502616: ktime_get
<-tick_nohz_stop_sched_tick
<idle>-0 [000] 4154504576.502616: ktime_get_ts <-ktime_get
<idle>-0 [000] 4154504576.502616: getnstimeofday
<-ktime_get_ts
<idle>-0 [000] 4154504576.502616: ixp4xx_get_cycles
<-getnstimeofday
<idle>-0 [000] 4154504576.502616: set_normalized_timespec
<-ktime_get_ts
--
Iratxo Pichel Ortiz
Software Development Manager
Albentia Systems S.A.
http://www.albentia.com
Tel: +34 914400567
Cel: +34 663808405
Fax: +34 914400569
C\Margarita Salas 22
Parque Tecnológico de Leganés
Leganés (28918)
Madrid
Spain
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