Account time spent in sys_futex using Babeltrace
You need to have LTTng installed, and Babeltrace installed with Python bindings.
lttng create -o .
lttng enable-channel --num-subbuf 16 --subbuf-size 2M -k c0
lttng enable-event sched_switch -k -c c0
lttng enable-event --syscall futex -k -c c0
lttng start
# do stuff..
lttng stop
lttng destroy
$> python3 count_futex.py kernel/
PROCESS_NAME (TID): LOCK_TIME ns
git (17550): 2,122
git (17551): 8,124
example (17554): 80,690,708
example (17555): 80,020,536
example (17556): 367,010,253
example (17557): 459,009,153
example (17558): 199,676,209
example (17559): 108,401
example (17560): 475,562,084
example (17561): 80,549,102
example (17562): 468,002,252
example (17564): 92,108,616
example (17566): 450,655,745
example (17567): 49,904,388
libvirtd (3772): 2,389
libvirtd (3773): 2,839
libvirtd (3775): 2,417
libvirtd (3776): 3,577
libvirtd (3777): 2,492