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offcputime_example.txt
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offcputime_example.txt
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Demonstrations of offcputime, the Linux eBPF/bcc version.
This program shows stack traces that were blocked, and the total duration they
were blocked. It works by tracing when threads block and when they return to
CPU, measuring both the time they were blocked (aka the "off-CPU time") and the
blocked stack trace and the task name. This data is summarized in kernel by
summing the blocked time by unique stack trace and task name.
Here is some example output. The -K option was used to only match kernel stacks.
To explain what we are seeing: the very first stack trace looks like a page
fault (do_page_fault() etc) from the "chmod" command, and in total was off-CPU
for 13 microseconds.
# ./offcputime -K
Tracing off-CPU time (us) of all threads by kernel stack... Hit Ctrl-C to end.
^C
schedule
schedule_timeout
io_schedule_timeout
bit_wait_io
__wait_on_bit
wait_on_page_bit_killable
__lock_page_or_retry
filemap_fault
__do_fault
handle_mm_fault
__do_page_fault
do_page_fault
page_fault
chmod
13
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rcu_nocb_kthread
kthread
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ddebug_tables
rcuos/0
22
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page_fault
run
27
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search_binary_handler
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do_execveat_common.isra.27
run
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run
82
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pipe_wait
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6630
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supervise
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16036
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24085
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entry_SYSCALL_64_fastpath
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iput
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entry_SYSCALL_64_fastpath
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bash
1789866
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3310763
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3999989
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watchdog/5
3999995
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3999996
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3999996
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watchdog/3
3999998
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watchdog/7
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watchdog/2
4000001
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watchdog/6
4000001
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4039675
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8212100
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8270305
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8371514
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8384013
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8405428
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8406930
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8409575
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8415062
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offcputime
8421478
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ret_from_fork