67vc33-b1a78eb8b39a7a2f.ithost.pongsawadi.ac.th

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/usr/share/doc/bpftrace/examples/

Edit File: biosnoop_example.txt

Demonstrations of biosnoop, the Linux BPF/bpftrace version.

This traces block I/O, and shows the issuing process (at least, the process
that was on-CPU at the time of queue insert) and the latency of the I/O:

# ./biosnoop.bt
Attaching 4 probes...
TIME(ms)     DISK             COMM             PID    LAT(ms)
611          nvme0n1          bash             4179        10
611          nvme0n1          cksum            4179         0
627          nvme0n1          cksum            4179        15
641          nvme0n1          cksum            4179        13
644          nvme0n1          cksum            4179         3
658          nvme0n1          cksum            4179        13
673          nvme0n1          cksum            4179        14
686          nvme0n1          cksum            4179        13
701          nvme0n1          cksum            4179        14
710          nvme0n1          cksum            4179         8
717          nvme0n1          cksum            4179         6
728          nvme0n1          cksum            4179        10
735          nvme0n1          cksum            4179         6
751          nvme0n1          cksum            4179        10
758          nvme0n1          cksum            4179        17
783          nvme0n1          cksum            4179        12
796          nvme0n1          cksum            4179        25
802          nvme0n1          cksum            4179        32
[...]

This output shows the cksum process was issuing block I/O, which were
completing with around 12 milliseconds of latency. Each block I/O event is
printed out, with a completion time as the first column, measured from
program start.

An example of some background flushing:

# ./biosnoop.bt
Attaching 4 probes...
TIME(ms)     DISK             COMM             PID    LAT(ms)
2966         nvme0n1          jbd2/nvme0n1-8   615          0
2967         nvme0n1          jbd2/nvme0n1-8   615          0
[...]

There is another version of this tool in bcc: https://github.com/iovisor/bcc
The bcc version provides more fields.

Cancel

Listing directory:

Name	Size	Modify	Owner/Group	Perms	Action	Select
bashreadline_example.txt	722 B	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
biolatency_example.txt	1.75 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
biosnoop_example.txt	2.01 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
biostacks_example.txt	1.87 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
bitesize_example.txt	2.93 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
capable_example.txt	2.6 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
cpuwalk_example.txt	4.8 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
dcsnoop_example.txt	4.5 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
execsnoop_example.txt	1.5 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
gethostlatency_example.txt	923 B	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
killsnoop_example.txt	846 B	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
loads_example.txt	864 B	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
mdflush_example.txt	1.82 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
naptime_example.txt	844 B	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
oomkill_example.txt	1.63 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
opensnoop_example.txt	2.47 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
pidpersec_example.txt	1.47 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
runqlat_example.txt	8.43 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
runqlen_example.txt	980 B	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
setuids_example.txt	2.38 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
ssllatency_example.txt	4.4 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
sslsnoop_example.txt	1.87 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
statsnoop_example.txt	2.67 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
swapin_example.txt	549 B	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
syncsnoop_example.txt	541 B	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
syscount_example.txt	1.12 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
tcpaccept_example.txt	1.32 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
tcpconnect_example.txt	1.06 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
tcpdrop_example.txt	1.23 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
tcplife_example.txt	1.56 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
tcpretrans_example.txt	1.13 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
tcpsynbl_example.txt	940 B	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
threadsnoop_example.txt	1.15 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
undump_example.txt	680 B	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
vfscount_example.txt	1.17 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
vfsstat_example.txt	929 B	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
writeback_example.txt	1.92 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download
xfsdist_example.txt	3.34 KB	07.03.2024 22:14:52	0/0	-rw-r--r--	Edit Rename Download

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