If I am interpreting the ftrace output correctly, I seem to be having a
problem with migrating ksoftirqd threads. I've attached a trace below
but the following line illustrates the issue:
# TASK-PID CPU# TIMESTAMP FUNCTION
# | | | | |
...
ksoftirqd/1-15 [000] 413.997630: dmvl_debug0 <-run_ksoftirqd
I would expect ksoftirqd/1 to remain on CPU 1. If migration is actually
happening, I think explains the strange msleep_interruptible() behavior
I'm seeing--ksoftirqd only runs the timer queue for the processor on which
it's running, and no ksoftirqd is running on the processor on which the
timer_list entry was added.
[Note: dmvl_debug0() is a dummy function I inserted at the top of the loop
in run_ksoftirqd so I could verify with ftrace that it actually got there]
--------------------------------- cut here ------------------------------------
# tracer: function
#
# TASK-PID CPU# TIMESTAMP FUNCTION
# | | | | |
ksoftirqd/1-15 [001] 413.985590: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.985596: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.985603: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.985613: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.986585: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.986595: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.986600: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.986613: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.987581: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.987595: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.987596: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.987607: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.988581: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.988594: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.988596: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.988605: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.989581: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.989597: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.989601: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.989603: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.990581: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.990589: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.990594: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.990607: dmvl_debug0 <-run_ksoftirqd
rcuc/0-8 [000] 413.990630: __do_softirq <-local_bh_enable
rcuc/0-8 [000] 413.990642: __do_softirq <-local_bh_enable
ksoftirqd/0-3 [000] 413.990650: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.991580: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.991586: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.991592: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.991598: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.992579: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.992593: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.992597: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.992599: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.993579: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.993586: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.993591: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.993604: dmvl_debug0 <-run_ksoftirqd
rcuc/0-8 [000] 413.993623: __do_softirq <-local_bh_enable
rcuc/0-8 [000] 413.993635: __do_softirq <-local_bh_enable
rcuc/0-8 [000] 413.993644: __do_softirq <-local_bh_enable
ksoftirqd/0-3 [000] 413.993652: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.994584: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.994590: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.994593: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.994603: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.995583: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.995589: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.995590: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.995600: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.996582: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.996590: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.996592: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.996598: dmvl_debug0 <-run_ksoftirqd
rcuc/0-8 [000] 413.996616: __do_softirq <-local_bh_enable
rcuc/0-8 [000] 413.996629: __do_softirq <-local_bh_enable
rcuc/0-8 [000] 413.996639: __do_softirq <-local_bh_enable
rcuc/0-8 [000] 413.996648: __do_softirq <-local_bh_enable
rcuc/0-8 [000] 413.996658: __do_softirq <-local_bh_enable
rcuc/0-8 [000] 413.996667: __do_softirq <-local_bh_enable
ksoftirqd/0-3 [000] 413.996675: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.997584: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.997592: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.997601: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.997603: dmvl_debug0 <-run_ksoftirqd
rcuc/1-14 [001] 413.997627: __do_softirq <-local_bh_enable
ksoftirqd/1-15 [000] 413.997630: dmvl_debug0 <-run_ksoftirqd
rcuc/1-14 [001] 413.997643: __do_softirq <-local_bh_enable
ksoftirqd/1-15 [000] 413.997644: dmvl_debug0 <-run_ksoftirqd
rcuc/1-14 [001] 413.997655: __do_softirq <-local_bh_enable
ksoftirqd/1-15 [000] 413.997657: dmvl_debug0 <-run_ksoftirqd
rcuc/1-14 [001] 413.997668: __do_softirq <-local_bh_enable
ksoftirqd/1-15 [000] 413.997670: dmvl_debug0 <-run_ksoftirqd
rcuc/1-14 [001] 413.997681: __do_softirq <-local_bh_enable
ksoftirqd/1-15 [000] 413.997682: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.998596: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.998607: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.998608: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.998616: dmvl_debug0 <-run_ksoftirqd
ksoftirqd/0-3 [000] 413.999583: ksoftirqd_do_softirq <-run_ksoftirqd
ksoftirqd/1-15 [001] 413.999590: ksoftirqd_do_softirq <-run_ksoftirqd
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