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lib
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drwxr-xr-x
2025-11-05 21:34
argdist_example.txt
22.49
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2023-12-08 15:36
bashreadline_example.txt
882
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2023-12-08 15:36
bindsnoop_example.txt
4.42
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2023-12-08 15:36
biolatency_example.txt
23.46
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2023-12-08 15:36
biolatpcts_example.txt
2.97
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2023-12-08 15:36
biopattern_example.txt
1.37
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biosnoop_example.txt
3.47
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2023-12-08 15:36
biotop_example.txt
9.11
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2023-12-08 15:36
bitesize_example.txt
4.98
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2023-12-08 15:36
bpflist_example.txt
2.13
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2023-12-08 15:36
btrfsdist_example.txt
9.32
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2023-12-08 15:36
btrfsslower_example.txt
6.65
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2023-12-08 15:36
cachestat_example.txt
3.92
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cachetop_example.txt
3.83
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2023-12-08 15:36
capable_example.txt
6.5
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2023-12-08 15:36
cobjnew_example.txt
2.97
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2023-12-08 15:36
compactsnoop_example.txt
9.92
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2023-12-08 15:36
cpudist_example.txt
16.48
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2023-12-08 15:36
cpuunclaimed_example.txt
15.2
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2023-12-08 15:36
criticalstat_example.txt
4.81
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2023-12-08 15:36
cthreads_example.txt
2.08
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2023-12-08 15:36
dbslower_example.txt
3.89
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2023-12-08 15:36
dbstat_example.txt
6.5
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2023-12-08 15:36
dcsnoop_example.txt
4.27
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2023-12-08 15:36
dcstat_example.txt
3.26
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2023-12-08 15:36
deadlock_example.txt
16.25
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2023-12-08 15:36
dirtop_example.txt
4.98
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2023-12-08 15:36
drsnoop_example.txt
5
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2023-12-08 15:36
execsnoop_example.txt
6.64
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2023-12-08 15:36
exitsnoop_example.txt
6.22
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2023-12-08 15:36
ext4dist_example.txt
8.78
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2023-12-08 15:36
ext4slower_example.txt
11.07
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2023-12-08 15:36
filegone_example.txt
743
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2023-12-08 15:36
filelife_example.txt
2.04
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2023-12-08 15:36
fileslower_example.txt
5.58
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filetop_example.txt
6.8
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2023-12-08 15:36
funccount_example.txt
13.29
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2023-12-08 15:36
funcinterval_example.txt
15.28
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funclatency_example.txt
20.98
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2023-12-08 15:36
funcslower_example.txt
6.63
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2023-12-08 15:36
gethostlatency_example.txt
1.29
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2023-12-08 15:36
hardirqs_example.txt
37.05
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2023-12-08 15:36
inject_example.txt
6.67
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2023-12-08 15:36
javacalls_example.txt
3.91
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javaflow_example.txt
5.88
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2023-12-08 15:36
javagc_example.txt
3.78
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2023-12-08 15:36
javaobjnew_example.txt
2.97
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2023-12-08 15:36
javastat_example.txt
2.98
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2023-12-08 15:36
javathreads_example.txt
2.08
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2023-12-08 15:36
killsnoop_example.txt
1.31
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2023-12-08 15:36
klockstat_example.txt
8.34
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2023-12-08 15:36
kvmexit_example.txt
11.63
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2023-12-08 15:36
llcstat_example.txt
3.24
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2023-12-08 15:36
mdflush_example.txt
1.74
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2023-12-08 15:36
memleak_example.txt
10.02
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2023-12-08 15:36
mountsnoop_example.txt
1.45
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2023-12-08 15:36
mysqld_qslower_example.txt
2.3
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2023-12-08 15:36
netqtop_example.txt
12.2
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2023-12-08 15:36
nfsdist_example.txt
8.31
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2023-12-08 15:36
nfsslower_example.txt
7.68
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2023-12-08 15:36
nodegc_example.txt
3.78
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2023-12-08 15:36
nodestat_example.txt
2.98
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2023-12-08 15:36
offcputime_example.txt
19.2
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2023-12-08 15:36
offwaketime_example.txt
37.36
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2023-12-08 15:36
oomkill_example.txt
1.88
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2023-12-08 15:36
opensnoop_example.txt
10.33
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2023-12-08 15:36
perlcalls_example.txt
3.91
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2023-12-08 15:36
perlflow_example.txt
5.88
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perlstat_example.txt
2.98
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2023-12-08 15:36
phpcalls_example.txt
3.91
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2023-12-08 15:36
phpflow_example.txt
5.88
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2023-12-08 15:36
phpstat_example.txt
2.98
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2023-12-08 15:36
pidpersec_example.txt
677
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2023-12-08 15:36
ppchcalls_example.txt
6.93
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2023-12-08 15:36
profile_example.txt
31.08
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2023-12-08 15:36
pythoncalls_example.txt
3.91
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2023-12-08 15:36
pythonflow_example.txt
5.88
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2023-12-08 15:36
pythongc_example.txt
3.78
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2023-12-08 15:36
pythonstat_example.txt
2.98
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2023-12-08 15:36
rdmaucma_example.txt
1.94
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2023-12-08 15:36
readahead_example.txt
3.17
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2023-12-08 15:36
reset-trace_example.txt
9.15
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2023-12-08 15:36
rubycalls_example.txt
3.91
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2023-12-08 15:36
rubyflow_example.txt
5.88
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2023-12-08 15:36
rubygc_example.txt
3.78
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2023-12-08 15:36
rubyobjnew_example.txt
2.97
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2023-12-08 15:36
rubystat_example.txt
2.98
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2023-12-08 15:36
runqlat_example.txt
31.3
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2023-12-08 15:36
runqlen_example.txt
11.85
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runqslower_example.txt
2.13
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2023-12-08 15:36
shmsnoop_example.txt
2.73
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2023-12-08 15:36
slabratetop_example.txt
5.22
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2023-12-08 15:36
sofdsnoop_example.txt
3.14
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2023-12-08 15:36
softirqs_example.txt
11.02
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2023-12-08 15:36
solisten_example.txt
2.3
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2023-12-08 15:36
sslsniff_example.txt
6.74
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2023-12-08 15:36
stackcount_example.txt
21.45
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2023-12-08 15:36
statsnoop_example.txt
3.02
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2023-12-08 15:36
swapin.txt
2.57
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2023-12-08 15:36
swapin_example.txt
1.39
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2023-12-08 15:36
syncsnoop_example.txt
387
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2023-12-08 15:36
syscount_example.txt
6.27
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2023-12-08 15:36
tclcalls_example.txt
3.91
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tclflow_example.txt
5.88
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tclobjnew_example.txt
2.97
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tclstat_example.txt
2.98
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tcpaccept_example.txt
2.76
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tcpcong_example.txt
33.31
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tcpconnect_example.txt
6.27
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tcpconnlat_example.txt
2.55
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tcpdrop_example.txt
1.95
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tcplife_example.txt
6.83
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tcpretrans_example.txt
3.85
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tcprtt_example.txt
9.83
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tcpstates_example.txt
2.84
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tcpsubnet_example.txt
5.37
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tcpsynbl_example.txt
1.15
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tcptop_example.txt
5.75
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tcptracer_example.txt
1.98
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threadsnoop_example.txt
1.07
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2023-12-08 15:36
tplist_example.txt
4.4
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trace_example.txt
21.62
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ttysnoop_example.txt
3.24
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2023-12-08 15:36
vfscount_example.txt
2.17
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2023-12-08 15:36
vfsstat_example.txt
1.66
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virtiostat_example.txt
2.62
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2023-12-08 15:36
wakeuptime_example.txt
33.25
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2023-12-08 15:36
xfsdist_example.txt
6.77
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xfsslower_example.txt
6.91
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zfsdist_example.txt
9.52
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zfsslower_example.txt
7.37
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2023-12-08 15:36
Save
Rename
Demonstrations of dcsnoop, the Linux eBPF/bcc version. dcsnoop traces directory entry cache (dcache) lookups, and can be used for further investigation beyond dcstat(8). The output is likely verbose, as dcache lookups are likely frequent. By default, only failed lookups are shown. For example: # ./dcsnoop.py TIME(s) PID COMM T FILE 0.002837 1643 snmpd M net/dev 0.002852 1643 snmpd M 1643 0.002856 1643 snmpd M net 0.002863 1643 snmpd M dev 0.002952 1643 snmpd M net/if_inet6 0.002964 1643 snmpd M if_inet6 0.003180 1643 snmpd M net/ipv4/neigh/eth0/retrans_time_ms 0.003192 1643 snmpd M ipv4/neigh/eth0/retrans_time_ms 0.003197 1643 snmpd M neigh/eth0/retrans_time_ms 0.003203 1643 snmpd M eth0/retrans_time_ms 0.003206 1643 snmpd M retrans_time_ms 0.003245 1643 snmpd M ipv6/neigh/eth0/retrans_time_ms 0.003249 1643 snmpd M neigh/eth0/retrans_time_ms 0.003252 1643 snmpd M eth0/retrans_time_ms 0.003255 1643 snmpd M retrans_time_ms 0.003287 1643 snmpd M conf/eth0/forwarding 0.003292 1643 snmpd M eth0/forwarding 0.003295 1643 snmpd M forwarding 0.003326 1643 snmpd M base_reachable_time_ms [...] I ran a drop caches at the same time as executing this tool. The output shows the processes, the type of event ("T" column: M == miss, R == reference), and the filename for the dcache lookup. The way the dcache is currently implemented, each component of a path is checked in turn. The first line, showing "net/dev" from snmp, will be a lookup for "net" in a directory (that isn't shown here). If it finds "net", it will then lookup "dev" inside net. You can see this sequence a little later, starting at time 0.003180, where a pathname is being searched directory by directory. The -a option will show all lookups, although be warned, the output will be very verbose. For example: # ./dcsnoop TIME(s) PID COMM T FILE 0.000000 20279 dcsnoop.py M p_lookup_fast 0.000010 20279 dcsnoop.py M enable 0.000013 20279 dcsnoop.py M id 0.000015 20279 dcsnoop.py M filter 0.000017 20279 dcsnoop.py M trigger 0.000019 20279 dcsnoop.py M format 0.006148 20279 dcsnoop.py R sys/kernel/debug/tracing/trace_pipe 0.006158 20279 dcsnoop.py R kernel/debug/tracing/trace_pipe 0.006161 20279 dcsnoop.py R debug/tracing/trace_pipe 0.006164 20279 dcsnoop.py R tracing/trace_pipe 0.006166 20279 dcsnoop.py R trace_pipe 0.015900 1643 snmpd R proc/sys/net/ipv6/conf/lo/forwarding 0.015901 1643 snmpd R sys/net/ipv6/conf/lo/forwarding 0.015901 1643 snmpd R net/ipv6/conf/lo/forwarding 0.015902 1643 snmpd R ipv6/conf/lo/forwarding 0.015903 1643 snmpd R conf/lo/forwarding 0.015904 1643 snmpd R lo/forwarding 0.015905 1643 snmpd M lo/forwarding 0.015908 1643 snmpd R forwarding 0.015909 1643 snmpd M forwarding 0.015937 1643 snmpd R proc/sys/net/ipv6/neigh/lo/base_reachable_time_ms 0.015937 1643 snmpd R sys/net/ipv6/neigh/lo/base_reachable_time_ms 0.015938 1643 snmpd R net/ipv6/neigh/lo/base_reachable_time_ms 0.015939 1643 snmpd R ipv6/neigh/lo/base_reachable_time_ms 0.015940 1643 snmpd R neigh/lo/base_reachable_time_ms 0.015941 1643 snmpd R lo/base_reachable_time_ms 0.015941 1643 snmpd R base_reachable_time_ms 0.015943 1643 snmpd M base_reachable_time_ms 0.043569 1876 supervise M 20281 0.043573 1886 supervise M 20280 0.043582 1886 supervise R supervise/status.new [...] USAGE message: # ./dcsnoop.py -h usage: dcsnoop.py [-h] [-a] Trace directory entry cache (dcache) lookups optional arguments: -h, --help show this help message and exit -a, --all trace all lookups (default is fails only) examples: ./dcsnoop # trace failed dcache lookups ./dcsnoop -a # trace all dcache lookups