(Dropping oprofile-list@xxxxxxxxxxxxxxxxxxxxx)
Ingo Molnar wrote:
John Sigler wrote:
With a pair of the following in the middle:
softirq--4 0.... 670us : call_rcu (rt_run_flush)
softirq--4 0D..1 670us : __rcu_advance_callbacks (call_rcu)
Any idea what went wrong in the above function trace? Why is the
kernel spinning in circles that way?
does your test-app have higher priority than softirq--4 ?
PID 4 is [softirq-timer/0] and has priority 50 in SCHED_FIFO.
My process has priority 80 in SCHED_RR. It is waiting for IRQ10.
My user-space app has higher priority than everything except
PID 2 which is [posix_cpu_timer]
Is this a priority inversion issue?
Regards.
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