Name	Size	Mode	Actions
bashreadline_example.txt	722	0644	editdlrm
biolatency_example.txt	1790	0644	editdlrm
biosnoop_example.txt	2056	0644	editdlrm
biostacks_example.txt	1914	0644	editdlrm
bitesize_example.txt	3003	0644	editdlrm
capable_example.txt	2659	0644	editdlrm
cpuwalk_example.txt	4919	0644	editdlrm
dcsnoop_example.txt	4612	0644	editdlrm
execsnoop_example.txt	1535	0644	editdlrm
gethostlatency_example.txt	923	0644	editdlrm
killsnoop_example.txt	846	0644	editdlrm
loads_example.txt	864	0644	editdlrm
mdflush_example.txt	1866	0644	editdlrm
naptime_example.txt	844	0644	editdlrm
oomkill_example.txt	1668	0644	editdlrm
opensnoop_example.txt	2528	0644	editdlrm
pidpersec_example.txt	1504	0644	editdlrm
runqlat_example.txt	8632	0644	editdlrm
runqlen_example.txt	980	0644	editdlrm
setuids_example.txt	2441	0644	editdlrm
ssllatency_example.txt	4510	0644	editdlrm
sslsnoop_example.txt	1916	0644	editdlrm
statsnoop_example.txt	2738	0644	editdlrm
swapin_example.txt	549	0644	editdlrm
syncsnoop_example.txt	541	0644	editdlrm
syscount_example.txt	1144	0644	editdlrm
tcpaccept_example.txt	1350	0644	editdlrm
tcpconnect_example.txt	1085	0644	editdlrm
tcpdrop_example.txt	1256	0644	editdlrm
tcplife_example.txt	1597	0644	editdlrm
tcpretrans_example.txt	1153	0644	editdlrm
tcpsynbl_example.txt	940	0644	editdlrm
threadsnoop_example.txt	1182	0644	editdlrm
undump_example.txt	680	0644	editdlrm
vfscount_example.txt	1199	0644	editdlrm
vfsstat_example.txt	929	0644	editdlrm
writeback_example.txt	1962	0644	editdlrm
xfsdist_example.txt	3419	0644	editdlrm

Demonstrations of gethostlatency, the Linux bpftrace/eBPF version. This traces host name lookup calls (getaddrinfo(), gethostbyname(), and gethostbyname2()), and shows the PID and command performing the lookup, the latency (duration) of the call in milliseconds, and the host string: # ./gethostlatency.bt Attaching 7 probes... Tracing getaddr/gethost calls... Hit Ctrl-C to end. TIME PID COMM LATms HOST 02:52:05 19105 curl 81 www.netflix.com 02:52:12 19111 curl 17 www.netflix.com 02:52:19 19116 curl 9 www.facebook.com 02:52:23 19118 curl 3 www.facebook.com In this example, the first call to lookup "www.netflix.com" took 81 ms, and the second took 17 ms (sounds like some caching). There is another version of this tool in bcc: https://github.com/iovisor/bcc The bcc version provides options to customize the output.