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Demonstrations of klockstat, the Linux eBPF/bcc version.
klockstat traces kernel mutex lock events and display locks statistics
# klockstat.py
Tracing lock events... Hit Ctrl-C to end.
^C
Caller Avg Spin Count Max spin Total spin
psi_avgs_work+0x2e 3675 5 5468 18379
flush_to_ldisc+0x22 2833 2 4210 5667
n_tty_write+0x30c 3914 1 3914 3914
isig+0x5d 2390 1 2390 2390
tty_buffer_flush+0x2a 1604 1 1604 1604
commit_echoes+0x22 1400 1 1400 1400
n_tty_receive_buf_common+0x3b9 1399 1 1399 1399
Caller Avg Hold Count Max hold Total hold
flush_to_ldisc+0x22 42558 2 76135 85116
psi_avgs_work+0x2e 14821 5 20446 74106
n_tty_receive_buf_common+0x3b9 12300 1 12300 12300
n_tty_write+0x30c 10712 1 10712 10712
isig+0x5d 3362 1 3362 3362
tty_buffer_flush+0x2a 3078 1 3078 3078
commit_echoes+0x22 3017 1 3017 3017
Every caller to using kernel's mutex is displayed on every line.
First portion of lines show the lock acquiring data, showing the
amount of time it took to acquired given lock.
'Caller' - symbol acquiring the mutex
'Average Spin' - average time to acquire the mutex
'Count' - number of times mutex was acquired
'Max spin' - maximum time to acquire the mutex
'Total spin' - total time spent in acquiring the mutex
Second portion of lines show the lock holding data, showing the
amount of time it took to hold given lock.
'Caller' - symbol holding the mutex
'Average Hold' - average time mutex was held
'Count' - number of times mutex was held
'Max hold' - maximum time mutex was held
'Total hold' - total time spent in holding the mutex
This works by tracing mutex_lock/unlock kprobes, updating the
lock stats in maps and processing them in the python part.
An -i option can be used to display stats in interval (5 seconds in example below):
# klockstat.py -i 5
Tracing lock events... Hit Ctrl-C to end.
Caller Avg Spin Count Max spin Total spin
psi_avgs_work+0x2e 3822 15 5650 57338
flush_to_ldisc+0x22 4630 1 4630 4630
work_fn+0x4f 4185 1 4185 4185
Caller Avg Hold Count Max hold Total hold
psi_avgs_work+0x2e 12155 15 15739 182329
flush_to_ldisc+0x22 13809 1 13809 13809
work_fn+0x4f 5274 1 5274 5274
Caller Avg Spin Count Max spin Total spin
psi_avgs_work+0x2e 3715 17 4374 63163
Caller Avg Hold Count Max hold Total hold
psi_avgs_work+0x2e 13141 17 19510 223399
^C
A -p option can be used to trace only selected process:
# klockstat.py -p 883
Tracing lock events... Hit Ctrl-C to end.
^C
Caller Avg Spin Count Max spin Total spin
pipe_wait+0xa9 625 412686 16930 258277958
pipe_read+0x3f 420 413425 16872 174017649
pipe_write+0x35 471 413425 16765 194792253
Caller Avg Hold Count Max hold Total hold
pipe_read+0x3f 473 413425 20063 195773647
pipe_wait+0xa9 604 412686 16972 249598153
pipe_write+0x35 481 413425 16944 199008064
A -c option can be used to display only callers with specific substring:
# klockstat.py -c pipe_
Tracing lock events... Hit Ctrl-C to end.
^C
Caller Avg Spin Count Max spin Total spin
pipe_read+0x3f 422 469554 18665 198354705
pipe_wait+0xa9 679 469536 17196 319017069
pipe_write+0x35 469 469554 17057 220338525
Caller Avg Hold Count Max hold Total hold
pipe_write+0x35 638 469554 17330 299857180
pipe_wait+0xa9 779 469535 16912 366047392
pipe_read+0x3f 575 469554 13251 270005394
An -n option can be used to display only specific number of callers:
# klockstat.py -n 3
Tracing lock events... Hit Ctrl-C to end.
^C
Caller Avg Spin Count Max spin Total spin
pipe_read+0x3f 420 334120 16964 140632284
pipe_wait+0xa9 688 334116 16876 229957062
pipe_write+0x35 463 334120 16791 154981747
Caller Avg Hold Count Max hold Total hold
flush_to_ldisc+0x22 27754 3 63270 83264
pipe_read+0x3f 571 334120 17123 190976463
pipe_wait+0xa9 759 334115 17068 253747213
An -s option can be used to display number of callers backtrace entries:
# klockstat.py -n 1 -s 3
Tracing lock events... Hit Ctrl-C to end.
^C
Caller Avg Spin Count Max spin Total spin
pipe_wait+0xa9 685 811947 17376 556542328
pipe_wait+0xa9
pipe_read+0x206
Caller Avg Hold Count Max hold Total hold
flush_to_ldisc+0x22 28145 3 63872 84437
flush_to_ldisc+0x22
process_one_work+0x1b0
Output can be sorted by using -S <fields> option on various
fields, the acq_total will force the acquired table to be
sorted on 'Total spin' column:
# klockstat.py -S acq_total
Tracing lock events... Hit Ctrl-C to end.
^C
Caller Avg Spin Count Max spin Total spin
pipe_wait+0xa9 691 269343 17190 186263983
pipe_write+0x35 464 269351 11730 125205417
pipe_read+0x3f 422 269351 17107 113724697
psi_avgs_work+0x2e 2499 11 4454 27494
flush_to_ldisc+0x22 3111 3 5096 9334
n_tty_write+0x30c 2764 1 2764 2764
isig+0x5d 1287 1 1287 1287
tty_buffer_flush+0x2a 961 1 961 961
commit_echoes+0x22 892 1 892 892
n_tty_receive_buf_common+0x3b9 868 1 868 868
Caller Avg Hold Count Max hold Total hold
pipe_wait+0xa9 788 269343 17128 212496240
pipe_write+0x35 637 269351 17209 171596811
pipe_read+0x3f 585 269351 11834 157606323
psi_avgs_work+0x2e 8726 11 19177 95996
flush_to_ldisc+0x22 22158 3 43731 66474
n_tty_write+0x30c 9770 1 9770 9770
n_tty_receive_buf_common+0x3b9 6830 1 6830 6830
isig+0x5d 3114 1 3114 3114
tty_buffer_flush+0x2a 2032 1 2032 2032
commit_echoes+0x22 1616 1 1616 1616