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Date: Mon, 27 Aug 2018 09:16:05 +0200
From: Daniel Wagner <wagi@...om.org>
To: LKML <linux-kernel@...r.kernel.org>,
linux-rt-users <linux-rt-users@...r.kernel.org>,
Steven Rostedt <rostedt@...dmis.org>,
Thomas Gleixner <tglx@...utronix.de>,
Carsten Emde <C.Emde@...dl.org>,
John Kacur <jkacur@...hat.com>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
Daniel Wagner <daniel.wagner@...mens.com>,
Tom Zanussi <tom.zanussi@...ux.intel.com>,
Julia Cartwright <julia@...com>
Subject: Re: [ANNOUNCE] 4.4.148-rt165
Hi,
> Known issues:
>
> - 'stress-ng --ptrace 4' is able to trigger a latency spike of
> several ms. Usually around 2 - 3ms on two different x86_64 boxes I can
> test on. 4.9-rt seems to have the same problem. 4.14-rt and 4.16-rt
> work just fine. Still debugging the issue.
I have a good reproducer for this problem.
- start 'stress-ng --ptrace 4' in the background
- start 'cyclictest -P 80 -n -m -S -b 2000' (*)
- start 'trace-cmd start -e all -p function -l '*mutex*'
Few observations:
- Running cyclictest with '-i 1000 -d 0' -> no latency spikes
- Tracing spinlocks via "-l '*locks'*" -> no latency spikes
In the trace below the latency spike is on CPU0. It looks like it
doesn't make any progress after signal_generate:
stress-n-1931 0d..11 5060.891219: function: __try_to_take_rt_mutex
stress-n-1931 0d..11 5060.891219: function: rt_mutex_dequeue
stress-n-1931 0d..21 5060.891220: function: rt_mutex_enqueue_pi
stress-n-1931 0....2 5060.891220: signal_generate: sig=17 errno=0 code=262148 comm=stress-ng-ptrac pid=1928 grp=1 res=1
stress-n-1931 0d..21 5060.894114: function: rt_mutex_dequeue_pi
stress-n-1931 0d.h11 5060.894115: local_timer_entry: vector=239
While on CPU1 at the same time this happens:
stress-n-1928 1....0 5060.891215: sys_enter: NR 101 (18, 78b, 0, 0, 17, 788)
stress-n-1928 1d..11 5060.891216: function: __try_to_take_rt_mutex
stress-n-1928 1d..21 5060.891216: function: rt_mutex_enqueue_pi
stress-n-1928 1d..21 5060.891217: function: rt_mutex_dequeue_pi
stress-n-1928 1....1 5060.891217: function: rt_mutex_adjust_prio
stress-n-1928 1d..11 5060.891218: function: __rt_mutex_adjust_prio
stress-n-1928 1d.h10 5060.894114: local_timer_entry: vector=239
That is what I have at this point. I looks like rt_mutex could be
involved in this problem.
Thanks,
Daniel
(*) In the trace below I am using my rewrite of cyclictest called
jitterdebugger. Does the same thing just without all the
whistle and bells. For example it doesn't play with the
tracer, which allows my to write something like
cnt=0
while true ; do
trace-cmd start -e all -p function -l '*mutex*' > /dev/null
~/jitterdebugger -b 1000 -f jt-$cnt.json -v
trace-cmd extract -o trace-$cnt.dat > /dev/null
cnt=$(($cnt + 1))
done
cpu 0: only
stress-n-1931 0d..20 5060.891195: sched_stat_runtime: comm=stress-ng-ptrac pid=1931 runtime=6708 [ns] vruntime=1977715609843 [ns]
stress-n-1931 0d..20 5060.891196: sched_stat_wait: comm=stress-ng-ptrac pid=1927 delay=17045 [ns]
stress-n-1931 0d..20 5060.891196: sched_switch: stress-ng-ptrac:1931 [120] D ==> stress-ng-ptrac:1927 [120]
stress-n-1931 0d..20 5060.891197: tlb_flush: pages=-1 reason=flush on task switch (0)
stress-n-1927 0d..21 5060.891198: function: rt_mutex_dequeue_pi
stress-n-1927 0d..11 5060.891199: sched_waking: comm=stress-ng-ptrac pid=1928 prio=120 target_cpu=001
stress-n-1927 0d..21 5060.891200: sched_stat_runtime: comm=stress-ng-ptrac pid=1932 runtime=3621 [ns] vruntime=2068053558563 [ns]
stress-n-1927 0d..21 5060.891201: sched_stat_blocked: comm=stress-ng-ptrac pid=1928 delay=14885 [ns]
stress-n-1927 0d..21 5060.891202: sched_wakeup: stress-ng-ptrac:1928 [120] success=1 CPU:001
stress-n-1927 0....1 5060.891202: function: rt_mutex_adjust_prio
stress-n-1927 0d..11 5060.891203: function: __rt_mutex_adjust_prio
stress-n-1927 0d..20 5060.891203: sched_wait_task: comm=stress-ng-ptrac pid=1930 prio=120
stress-n-1927 0d..10 5060.891204: sched_waking: comm=stress-ng-ptrac pid=1930 prio=120 target_cpu=000
stress-n-1927 0d..20 5060.891204: sched_stat_runtime: comm=stress-ng-ptrac pid=1927 runtime=9515 [ns] vruntime=1977720093354 [ns]
stress-n-1927 0d..20 5060.891205: sched_wakeup: stress-ng-ptrac:1930 [120] success=1 CPU:000
stress-n-1927 0...10 5060.891205: rcu_utilization: Start context switch
stress-n-1927 0...10 5060.891206: rcu_utilization: End context switch
stress-n-1927 0d..20 5060.891206: sched_stat_runtime: comm=stress-ng-ptrac pid=1927 runtime=2013 [ns] vruntime=1977720095367 [ns]
stress-n-1927 0d..20 5060.891207: sched_stat_wait: comm=stress-ng-ptrac pid=1930 delay=2013 [ns]
stress-n-1927 0d..20 5060.891207: sched_switch: stress-ng-ptrac:1927 [120] R ==> stress-ng-ptrac:1930 [120]
stress-n-1927 0d..20 5060.891208: tlb_flush: pages=-1 reason=flush on task switch (0)
stress-n-1930 0d..11 5060.891210: function: __try_to_take_rt_mutex
stress-n-1930 0d..21 5060.891211: function: rt_mutex_enqueue_pi
stress-n-1930 0....2 5060.891211: signal_generate: sig=17 errno=0 code=262148 comm=stress-ng-ptrac pid=1927 grp=1 res=1
stress-n-1930 0d..21 5060.891212: function: rt_mutex_dequeue_pi
stress-n-1930 0....1 5060.891213: function: rt_mutex_adjust_prio
stress-n-1930 0d..11 5060.891214: function: __rt_mutex_adjust_prio
stress-n-1930 0...10 5060.891214: rcu_utilization: Start context switch
stress-n-1930 0...10 5060.891214: rcu_utilization: End context switch
stress-n-1930 0d..20 5060.891215: sched_stat_runtime: comm=stress-ng-ptrac pid=1930 runtime=3639 [ns] vruntime=1977714643707 [ns]
stress-n-1930 0d..20 5060.891216: sched_stat_wait: comm=stress-ng-ptrac pid=1931 delay=3639 [ns]
stress-n-1930 0d..20 5060.891217: sched_switch: stress-ng-ptrac:1930 [120] t|W ==> stress-ng-ptrac:1931 [120]
stress-n-1930 0d..20 5060.891217: tlb_flush: pages=-1 reason=flush on task switch (0)
stress-n-1931 0d..11 5060.891219: function: __try_to_take_rt_mutex
stress-n-1931 0d..11 5060.891219: function: rt_mutex_dequeue
stress-n-1931 0d..21 5060.891220: function: rt_mutex_enqueue_pi
stress-n-1931 0....2 5060.891220: signal_generate: sig=17 errno=0 code=262148 comm=stress-ng-ptrac pid=1928 grp=1 res=1
stress-n-1931 0d..21 5060.894114: function: rt_mutex_dequeue_pi
stress-n-1931 0d.h11 5060.894115: local_timer_entry: vector=239
stress-n-1931 0d.h21 5060.894115: hrtimer_cancel: hrtimer=0xffff8800c7fabe38
stress-n-1931 0d.h11 5060.894115: hrtimer_expire_entry: hrtimer=0xffff8800c7fabe38 now=5061028001164 function=hrtimer_wakeup/0x0
stress-n-1931 0d.h21 5060.894116: sched_waking: comm=jitterdebugger pid=2530 prio=19 target_cpu=000
stress-n-1931 0dNh31 5060.894117: sched_wakeup: jitterdebugger:2530 [19] success=1 CPU:000
stress-n-1931 0dNh11 5060.894117: hrtimer_expire_exit: hrtimer=0xffff8800c7fabe38
stress-n-1931 0dNh21 5060.894117: hrtimer_cancel: hrtimer=0xffff88012fc10d80
stress-n-1931 0dNh11 5060.894118: hrtimer_expire_entry: hrtimer=0xffff88012fc10d80 now=5061028001164 function=tick_sched_timer/0x0
stress-n-1931 0dNh21 5060.894119: sched_stat_runtime: comm=stress-ng-ptrac pid=1931 runtime=2904713 [ns] vruntime=1977718514556 [ns]
stress-n-1931 0dNh11 5060.894121: softirq_raise: vec=7 [action=SCHED]
stress-n-1931 0dNh11 5060.894121: softirq_raise: vec=1 [action=TIMER]
stress-n-1931 0dNh11 5060.894122: rcu_utilization: Start scheduler-tick
stress-n-1931 0dNh11 5060.894122: rcu_utilization: End scheduler-tick
stress-n-1931 0dNh11 5060.894123: hrtimer_expire_exit: hrtimer=0xffff88012fc10d80
stress-n-1931 0dNh21 5060.894123: hrtimer_start: hrtimer=0xffff88012fc10d80 function=tick_sched_timer/0x0 expires=5061032000000 softexpires=5061032000000
stress-n-1931 0dNh11 5060.894124: local_timer_exit: vector=239
stress-n-1931 0dN.21 5060.894124: sched_waking: comm=ksoftirqd/0 pid=3 prio=120 target_cpu=000
stress-n-1931 0dN.31 5060.894125: sched_stat_sleep: comm=ksoftirqd/0 pid=3 delay=3977690 [ns]
stress-n-1931 0dN.31 5060.894125: sched_wakeup: ksoftirqd/0:3 [120] success=1 CPU:000
stress-n-1931 0dN.21 5060.894126: sched_waking: comm=ktimersoftd/0 pid=4 prio=98 target_cpu=000
stress-n-1931 0dN.31 5060.894127: sched_wakeup: ktimersoftd/0:4 [98] success=1 CPU:000
stress-n-1931 0.N.11 5060.894127: rcu_utilization: Start context switch
stress-n-1931 0.N.11 5060.894128: rcu_utilization: End context switch
stress-n-1931 0dN.21 5060.894128: sched_stat_runtime: comm=stress-ng-ptrac pid=1931 runtime=7046 [ns] vruntime=1977718521602 [ns]
stress-n-1931 0d..21 5060.894129: sched_switch: stress-ng-ptrac:1931 [120] R ==> jitterdebugger:2530 [19]
stress-n-1931 0d..21 5060.894130: tlb_flush: pages=-1 reason=flush on task switch (0)
jitterde-2530 0....0 5060.894131: sys_exit: NR 230 = 0
jitterde-2530 0....0 5060.894140: sys_enter: NR 1 (5, 7f25ae652eb0, 10, 75, 1, 10)
jitterde-2530 0....0 5060.894140: function: _mutex_lock
jitterde-2530 0....0 5060.894141: function: rt_mutex_lock
jitterde-2530 0....1 5060.894144: print: tracing_mark_write: Hit latency 2696
jitterde-2530 0....0 5060.894145: function: _mutex_unlock
jitterde-2530 0....0 5060.894145: function: rt_mutex_unlock
jitterde-2530 0....0 5060.894145: sys_exit: NR 1 = 16
jitterde-2530 0....0 5060.894146: sys_enter: NR 1 (4, 402194, 2, 75, 1, 10)
jitterde-2530 0....0 5060.894147: function: _mutex_lock
jitterde-2530 0....0 5060.894147: function: rt_mutex_lock
jitterde-2530 0....0 5060.894149: function: _mutex_lock
jitterde-2530 0....0 5060.894149: function: rt_mutex_lock
cpu 1 only
stress-n-1929 1d..20 5060.891169: sched_stat_runtime: comm=stress-ng-ptrac pid=1929 runtime=5688 [ns] vruntime=2068054001980 [ns]
stress-n-1929 1d..20 5060.891170: sched_stat_wait: comm=stress-ng-ptrac pid=1928 delay=5688 [ns]
stress-n-1929 1d..20 5060.891170: sched_switch: stress-ng-ptrac:1929 [120] R ==> stress-ng-ptrac:1928 [120]
stress-n-1929 1d..20 5060.891171: tlb_flush: pages=-1 reason=flush on task switch (0)
stress-n-1928 1....0 5060.891172: sys_exit: NR 61 = 1931
stress-n-1928 1....0 5060.891173: sys_enter: NR 101 (18, 78b, 0, 0, 17, 788)
stress-n-1928 1d..20 5060.891174: sched_wait_task: comm=stress-ng-ptrac pid=1931 prio=120
stress-n-1928 1d..10 5060.891175: sched_waking: comm=stress-ng-ptrac pid=1931 prio=120 target_cpu=000
stress-n-1928 1d..20 5060.891176: sched_stat_runtime: comm=stress-ng-ptrac pid=1927 runtime=7937 [ns] vruntime=1977720081607 [ns]
stress-n-1928 1d..20 5060.891177: sched_wakeup: stress-ng-ptrac:1931 [120] success=1 CPU:000
stress-n-1928 1....0 5060.891178: sys_exit: NR 101 = 0
stress-n-1928 1....0 5060.891178: sys_enter: NR 61 (78b, 7fff38c319f4, 0, 0, 17, 788)
stress-n-1928 1....0 5060.891179: sched_process_wait: comm=stress-ng-ptrac pid=1931 prio=120
stress-n-1928 1d..11 5060.891179: function: __try_to_take_rt_mutex
stress-n-1928 1d..11 5060.891180: function: task_blocks_on_rt_mutex
stress-n-1928 1d..21 5060.891180: function: __rt_mutex_adjust_prio
stress-n-1928 1d..21 5060.891180: function: rt_mutex_enqueue
stress-n-1928 1d..21 5060.891180: function: rt_mutex_dequeue_pi
stress-n-1928 1d..21 5060.891181: function: rt_mutex_enqueue_pi
stress-n-1928 1d..21 5060.891181: function: __rt_mutex_adjust_prio
stress-n-1928 1d..11 5060.891181: function: __try_to_take_rt_mutex
stress-n-1928 1...10 5060.891184: rcu_utilization: Start context switch
stress-n-1928 1...10 5060.891184: rcu_utilization: End context switch
stress-n-1928 1d..20 5060.891185: sched_stat_runtime: comm=stress-ng-ptrac pid=1928 runtime=16814 [ns] vruntime=2068049707094 [ns]
stress-n-1928 1d..20 5060.891186: sched_stat_wait: comm=stress-ng-ptrac pid=1929 delay=16814 [ns]
stress-n-1928 1d..20 5060.891187: sched_switch: stress-ng-ptrac:1928 [120] D ==> stress-ng-ptrac:1929 [120]
stress-n-1928 1d..20 5060.891187: tlb_flush: pages=-1 reason=flush on task switch (0)
stress-n-1929 1d..20 5060.891188: sched_wait_task: comm=stress-ng-ptrac pid=1932 prio=120
stress-n-1929 1d..10 5060.891188: sched_waking: comm=stress-ng-ptrac pid=1932 prio=120 target_cpu=001
stress-n-1929 1d..20 5060.891189: sched_stat_runtime: comm=stress-ng-ptrac pid=1929 runtime=4262 [ns] vruntime=2068054006242 [ns]
stress-n-1929 1d..20 5060.891190: sched_wakeup: stress-ng-ptrac:1932 [120] success=1 CPU:001
stress-n-1929 1....0 5060.891191: sys_exit: NR 101 = 0
stress-n-1929 1....0 5060.891192: sys_enter: NR 61 (78c, 7fff38c319f4, 0, 0, 17, 789)
stress-n-1929 1....0 5060.891192: sched_process_wait: comm=stress-ng-ptrac pid=1932 prio=120
stress-n-1929 1d..11 5060.891194: function: __try_to_take_rt_mutex
stress-n-1929 1d..11 5060.891194: function: task_blocks_on_rt_mutex
stress-n-1929 1d..21 5060.891194: function: __rt_mutex_adjust_prio
stress-n-1929 1d..21 5060.891195: function: rt_mutex_enqueue
stress-n-1929 1d..11 5060.891195: function: __try_to_take_rt_mutex
stress-n-1929 1...10 5060.891195: rcu_utilization: Start context switch
stress-n-1929 1...10 5060.891196: rcu_utilization: End context switch
stress-n-1929 1d..20 5060.891196: sched_stat_runtime: comm=stress-ng-ptrac pid=1929 runtime=7002 [ns] vruntime=2068054013244 [ns]
stress-n-1929 1d..20 5060.891197: sched_stat_wait: comm=stress-ng-ptrac pid=1932 delay=7002 [ns]
stress-n-1929 1d..20 5060.891198: sched_switch: stress-ng-ptrac:1929 [120] D ==> stress-ng-ptrac:1932 [120]
stress-n-1929 1d..20 5060.891198: tlb_flush: pages=-1 reason=flush on task switch (0)
stress-n-1932 1d..11 5060.891200: function: __try_to_take_rt_mutex
stress-n-1932 1d..21 5060.891201: function: rt_mutex_enqueue_pi
stress-n-1932 1....2 5060.891201: signal_generate: sig=17 errno=0 code=262148 comm=stress-ng-ptrac pid=1929 grp=1 res=1
stress-n-1932 1d.h.3 5060.891202: reschedule_entry: vector=253
stress-n-1932 1d.h.3 5060.891202: reschedule_exit: vector=253
stress-n-1932 1d..21 5060.891203: function: rt_mutex_dequeue_pi
stress-n-1932 1....1 5060.891204: function: rt_mutex_adjust_prio
stress-n-1932 1d..11 5060.891204: function: __rt_mutex_adjust_prio
stress-n-1932 1...10 5060.891204: rcu_utilization: Start context switch
stress-n-1932 1...10 5060.891205: rcu_utilization: End context switch
stress-n-1932 1d..20 5060.891206: sched_stat_runtime: comm=stress-ng-ptrac pid=1932 runtime=5495 [ns] vruntime=2068053564058 [ns]
stress-n-1932 1d..20 5060.891206: sched_stat_wait: comm=stress-ng-ptrac pid=1928 delay=5495 [ns]
stress-n-1932 1d..20 5060.891207: sched_switch: stress-ng-ptrac:1932 [120] R ==> stress-ng-ptrac:1928 [120]
stress-n-1932 1d..20 5060.891207: tlb_flush: pages=-1 reason=flush on task switch (0)
stress-n-1928 1d..11 5060.891208: function: __try_to_take_rt_mutex
stress-n-1928 1d..11 5060.891208: function: rt_mutex_dequeue
stress-n-1928 1d..21 5060.891209: function: rt_mutex_enqueue_pi
stress-n-1928 1d..21 5060.891210: function: rt_mutex_dequeue_pi
stress-n-1928 1d..11 5060.891210: sched_waking: comm=stress-ng-ptrac pid=1931 prio=120 target_cpu=000
stress-n-1928 1d..21 5060.891211: sched_stat_runtime: comm=stress-ng-ptrac pid=1930 runtime=4893 [ns] vruntime=1977714640068 [ns]
stress-n-1928 1d..21 5060.891212: sched_stat_blocked: comm=stress-ng-ptrac pid=1931 delay=16421 [ns]
stress-n-1928 1d..21 5060.891213: sched_wakeup: stress-ng-ptrac:1931 [120] success=1 CPU:000
stress-n-1928 1....1 5060.891213: function: rt_mutex_adjust_prio
stress-n-1928 1d..11 5060.891214: function: __rt_mutex_adjust_prio
stress-n-1928 1....0 5060.891214: sys_exit: NR 61 = 1931
stress-n-1928 1....0 5060.891215: sys_enter: NR 101 (18, 78b, 0, 0, 17, 788)
stress-n-1928 1d..11 5060.891216: function: __try_to_take_rt_mutex
stress-n-1928 1d..21 5060.891216: function: rt_mutex_enqueue_pi
stress-n-1928 1d..21 5060.891217: function: rt_mutex_dequeue_pi
stress-n-1928 1....1 5060.891217: function: rt_mutex_adjust_prio
stress-n-1928 1d..11 5060.891218: function: __rt_mutex_adjust_prio
stress-n-1928 1d.h10 5060.894114: local_timer_entry: vector=239
stress-n-1928 1d.h20 5060.894115: hrtimer_cancel: hrtimer=0xffff88012fc90d80
stress-n-1928 1d.h10 5060.894115: hrtimer_expire_entry: hrtimer=0xffff88012fc90d80 now=5061028000906 function=tick_sched_timer/0x0
stress-n-1928 1d.h20 5060.894116: sched_stat_runtime: comm=stress-ng-ptrac pid=1928 runtime=2911118 [ns] vruntime=2068052618212 [ns]
stress-n-1928 1d.h10 5060.894118: softirq_raise: vec=7 [action=SCHED]
stress-n-1928 1d.h10 5060.894118: softirq_raise: vec=1 [action=TIMER]
stress-n-1928 1d.h10 5060.894119: rcu_utilization: Start scheduler-tick
stress-n-1928 1d.h10 5060.894119: rcu_utilization: End scheduler-tick
stress-n-1928 1d.h10 5060.894120: hrtimer_expire_exit: hrtimer=0xffff88012fc90d80
stress-n-1928 1d.h20 5060.894120: hrtimer_start: hrtimer=0xffff88012fc90d80 function=tick_sched_timer/0x0 expires=5061032000000 softexpires=5061032000000
stress-n-1928 1d.h10 5060.894121: local_timer_exit: vector=239
stress-n-1928 1d..20 5060.894121: sched_waking: comm=ksoftirqd/1 pid=18 prio=120 target_cpu=001
stress-n-1928 1d..30 5060.894122: sched_stat_sleep: comm=ksoftirqd/1 pid=18 delay=3989353 [ns]
stress-n-1928 1d..30 5060.894123: sched_wakeup: ksoftirqd/1:18 [120] success=1 CPU:001
stress-n-1928 1d..20 5060.894123: sched_waking: comm=ktimersoftd/1 pid=17 prio=98 target_cpu=001
stress-n-1928 1dN.30 5060.894124: sched_wakeup: ktimersoftd/1:17 [98] success=1 CPU:001
stress-n-1928 1.N.10 5060.894125: rcu_utilization: Start context switch
stress-n-1928 1.N.10 5060.894125: rcu_utilization: End context switch
stress-n-1928 1dN.20 5060.894126: sched_stat_runtime: comm=stress-ng-ptrac pid=1928 runtime=7454 [ns] vruntime=2068052625666 [ns]
stress-n-1928 1d..20 5060.894127: sched_switch: stress-ng-ptrac:1928 [120] R ==> ktimersoftd/1:17 [98]
ktimerso-17 1....1 5060.894128: softirq_entry: vec=1 [action=TIMER]
ktimerso-17 1....1 5060.894129: softirq_exit: vec=1 [action=TIMER]
ktimerso-17 1...10 5060.894129: rcu_utilization: Start context switch
ktimerso-17 1...10 5060.894130: rcu_utilization: End context switch
ktimerso-17 1d..20 5060.894131: sched_stat_wait: comm=ksoftirqd/1 pid=18 delay=8463 [ns]
ktimerso-17 1d..20 5060.894131: sched_switch: ktimersoftd/1:17 [98] S ==> ksoftirqd/1:18 [120]
ksoftirq-18 1....1 5060.894132: softirq_entry: vec=7 [action=SCHED]
ksoftirq-18 1....1 5060.894133: softirq_exit: vec=7 [action=SCHED]
ksoftirq-18 1...10 5060.894134: rcu_utilization: Start context switch
ksoftirq-18 1...10 5060.894134: rcu_utilization: End context switch
ksoftirq-18 1d..20 5060.894134: sched_stat_runtime: comm=ksoftirqd/1 pid=18 runtime=4140 [ns] vruntime=8977334018960 [ns]
ksoftirq-18 1d..20 5060.894135: sched_stat_wait: comm=stress-ng-ptrac pid=1928 delay=10680 [ns]
ksoftirq-18 1d..20 5060.894136: sched_switch: ksoftirqd/1:18 [120] S ==> stress-ng-ptrac:1928 [120]
stress-n-1928 1d..20 5060.894137: sched_wait_task: comm=stress-ng-ptrac pid=1931 prio=120
stress-n-1928 1....0 5060.894137: hrtimer_init: hrtimer=0xffff8800c8043dc0 clockid=CLOCK_MONOTONIC mode=0x1
stress-n-1928 1d..10 5060.894137: hrtimer_start: hrtimer=0xffff8800c8043dc0 function=hrtimer_wakeup/0x0 expires=5061032023604 softexpires=5061032023604
stress-n-1928 1...10 5060.894138: rcu_utilization: Start context switch
stress-n-1928 1...10 5060.894138: rcu_utilization: End context switch
stress-n-1928 1d..20 5060.894139: sched_stat_runtime: comm=stress-ng-ptrac pid=1928 runtime=4271 [ns] vruntime=2068052629937 [ns]
stress-n-1928 1d..20 5060.894140: sched_stat_wait: comm=stress-ng-ptrac pid=1932 delay=2933523 [ns]
stress-n-1928 1d..20 5060.894140: sched_switch: stress-ng-ptrac:1928 [120] D ==> stress-ng-ptrac:1932 [120]
stress-n-1928 1d..20 5060.894141: tlb_flush: pages=-1 reason=flush on task switch (0)
stress-n-1932 1...10 5060.894142: rcu_utilization: Start context switch
stress-n-1932 1...10 5060.894142: rcu_utilization: End context switch
stress-n-1932 1d..20 5060.894142: sched_stat_runtime: comm=stress-ng-ptrac pid=1932 runtime=3690 [ns] vruntime=2068053567748 [ns]
stress-n-1932 1d..20 5060.894143: sched_switch: stress-ng-ptrac:1932 [120] t|W ==> swapper/1:0 [120]
<idle>-0 1d..10 5060.894145: cpu_idle: state=1 cpu_id=1
cpu 0 and 1:
stress-n-1932 1d..20 5060.891207: sched_switch: stress-ng-ptrac:1932 [120] R ==> stress-ng-ptrac:1928 [120]
stress-n-1927 0d..20 5060.891207: sched_stat_wait: comm=stress-ng-ptrac pid=1930 delay=2013 [ns]
stress-n-1927 0d..20 5060.891207b: sched_switch: stress-ng-ptrac:1927 [120] R ==> stress-ng-ptrac:1930 [120]
stress-n-1932 1d..20 5060.891207: tlb_flush: pages=-1 reason=flush on task switch (0)
stress-n-1927 0d..20 5060.891208: tlb_flush: pages=-1 reason=flush on task switch (0)
stress-n-1928 1d..11 5060.891208: function: __try_to_take_rt_mutex
stress-n-1928 1d..11 5060.891208: function: rt_mutex_dequeue
stress-n-1928 1d..21 5060.891209: function: rt_mutex_enqueue_pi
stress-n-1928 1d..21 5060.891210: function: rt_mutex_dequeue_pi
stress-n-1930 0d..11 5060.891210: function: __try_to_take_rt_mutex
stress-n-1928 1d..11 5060.891210: sched_waking: comm=stress-ng-ptrac pid=1931 prio=120 target_cpu=000
stress-n-1930 0d..21 5060.891211: function: rt_mutex_enqueue_pi
stress-n-1930 0....2 5060.891211: signal_generate: sig=17 errno=0 code=262148 comm=stress-ng-ptrac pid=1927 grp=1 res=1
stress-n-1928 1d..21 5060.891211: sched_stat_runtime: comm=stress-ng-ptrac pid=1930 runtime=4893 [ns] vruntime=1977714640068 [ns]
stress-n-1930 0d..21 5060.891212: function: rt_mutex_dequeue_pi
stress-n-1928 1d..21 5060.891212: sched_stat_blocked: comm=stress-ng-ptrac pid=1931 delay=16421 [ns]
stress-n-1928 1d..21 5060.891213: sched_wakeup: stress-ng-ptrac:1931 [120] success=1 CPU:000
stress-n-1928 1....1 5060.891213: function: rt_mutex_adjust_prio
stress-n-1930 0....1 5060.891213: function: rt_mutex_adjust_prio
stress-n-1928 1d..11 5060.891214: function: __rt_mutex_adjust_prio
stress-n-1930 0d..11 5060.891214: function: __rt_mutex_adjust_prio
stress-n-1930 0...10 5060.891214: rcu_utilization: Start context switch
stress-n-1930 0...10 5060.891214: rcu_utilization: End context switch
stress-n-1928 1....0 5060.891214: sys_exit: NR 61 = 1931
stress-n-1930 0d..20 5060.891215: sched_stat_runtime: comm=stress-ng-ptrac pid=1930 runtime=3639 [ns] vruntime=1977714643707 [ns]
stress-n-1928 1....0 5060.891215: sys_enter: NR 101 (18, 78b, 0, 0, 17, 788)
stress-n-1928 1d..11 5060.891216: function: __try_to_take_rt_mutex
stress-n-1930 0d..20 5060.891216: sched_stat_wait: comm=stress-ng-ptrac pid=1931 delay=3639 [ns]
stress-n-1928 1d..21 5060.891216: function: rt_mutex_enqueue_pi
stress-n-1930 0d..20 5060.891217: sched_switch: stress-ng-ptrac:1930 [120] t|W ==> stress-ng-ptrac:1931 [120]
stress-n-1928 1d..21 5060.891217: function: rt_mutex_dequeue_pi
stress-n-1930 0d..20 5060.891217: tlb_flush: pages=-1 reason=flush on task switch (0)
stress-n-1928 1....1 5060.891217: function: rt_mutex_adjust_prio
stress-n-1928 1d..11 5060.891218: function: __rt_mutex_adjust_prio
stress-n-1931 0d..11 5060.891219: function: __try_to_take_rt_mutex
stress-n-1931 0d..11 5060.891219: function: rt_mutex_dequeue
stress-n-1931 0d..21 5060.891220: function: rt_mutex_enqueue_pi
stress-n-1931 0....2 5060.891220: signal_generate: sig=17 errno=0 code=262148 comm=stress-ng-ptrac pid=1928 grp=1 res=1
stress-n-1931 0d..21 5060.894114: function: rt_mutex_dequeue_pi
stress-n-1928 1d.h10 5060.894114: local_timer_entry: vector=239
stress-n-1931 0d.h11 5060.894115: local_timer_entry: vector=239
stress-n-1928 1d.h20 5060.894115: hrtimer_cancel: hrtimer=0xffff88012fc90d80
stress-n-1931 0d.h21 5060.894115: hrtimer_cancel: hrtimer=0xffff8800c7fabe38
stress-n-1928 1d.h10 5060.894115: hrtimer_expire_entry: hrtimer=0xffff88012fc90d80 now=5061028000906 function=tick_sched_timer/0x0
stress-n-1931 0d.h11 5060.894115: hrtimer_expire_entry: hrtimer=0xffff8800c7fabe38 now=5061028001164 function=hrtimer_wakeup/0x0
stress-n-1931 0d.h21 5060.894116: sched_waking: comm=jitterdebugger pid=2530 prio=19 target_cpu=000
stress-n-1928 1d.h20 5060.894116: sched_stat_runtime: comm=stress-ng-ptrac pid=1928 runtime=2911118 [ns] vruntime=2068052618212 [ns]
stress-n-1931 0dNh31 5060.894117: sched_wakeup: jitterdebugger:2530 [19] success=1 CPU:000
stress-n-1931 0dNh11 5060.894117: hrtimer_expire_exit: hrtimer=0xffff8800c7fabe38
stress-n-1931 0dNh21 5060.894117: hrtimer_cancel: hrtimer=0xffff88012fc10d80
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