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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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bashreadline_example.txt
882
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bindsnoop_example.txt
4.42
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biolatency_example.txt
23.46
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biolatpcts_example.txt
2.97
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biopattern_example.txt
1.37
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biosnoop_example.txt
3.47
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biotop_example.txt
9.11
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bitesize_example.txt
4.98
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bpflist_example.txt
2.13
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btrfsdist_example.txt
9.32
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btrfsslower_example.txt
6.65
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cachestat_example.txt
3.92
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cachetop_example.txt
3.83
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capable_example.txt
6.5
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cobjnew_example.txt
2.97
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compactsnoop_example.txt
9.92
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cpudist_example.txt
16.48
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cpuunclaimed_example.txt
15.2
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criticalstat_example.txt
4.81
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cthreads_example.txt
2.08
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dbslower_example.txt
3.89
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dbstat_example.txt
6.5
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dcsnoop_example.txt
4.27
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dcstat_example.txt
3.26
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deadlock_example.txt
16.25
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dirtop_example.txt
4.98
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drsnoop_example.txt
5
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execsnoop_example.txt
6.64
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exitsnoop_example.txt
6.22
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ext4dist_example.txt
8.78
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ext4slower_example.txt
11.07
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filegone_example.txt
743
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filelife_example.txt
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fileslower_example.txt
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filetop_example.txt
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funccount_example.txt
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funcinterval_example.txt
15.28
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funclatency_example.txt
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funcslower_example.txt
6.63
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gethostlatency_example.txt
1.29
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hardirqs_example.txt
37.05
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inject_example.txt
6.67
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javacalls_example.txt
3.91
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javaflow_example.txt
5.88
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javagc_example.txt
3.78
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javaobjnew_example.txt
2.97
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javastat_example.txt
2.98
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javathreads_example.txt
2.08
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killsnoop_example.txt
1.31
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klockstat_example.txt
8.34
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kvmexit_example.txt
11.63
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llcstat_example.txt
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mdflush_example.txt
1.74
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memleak_example.txt
10.02
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mountsnoop_example.txt
1.45
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mysqld_qslower_example.txt
2.3
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netqtop_example.txt
12.2
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nfsdist_example.txt
8.31
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nfsslower_example.txt
7.68
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nodegc_example.txt
3.78
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nodestat_example.txt
2.98
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offcputime_example.txt
19.2
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offwaketime_example.txt
37.36
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oomkill_example.txt
1.88
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opensnoop_example.txt
10.33
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perlcalls_example.txt
3.91
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perlflow_example.txt
5.88
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perlstat_example.txt
2.98
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phpcalls_example.txt
3.91
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phpflow_example.txt
5.88
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phpstat_example.txt
2.98
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pidpersec_example.txt
677
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ppchcalls_example.txt
6.93
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profile_example.txt
31.08
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pythoncalls_example.txt
3.91
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pythonflow_example.txt
5.88
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pythongc_example.txt
3.78
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pythonstat_example.txt
2.98
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rdmaucma_example.txt
1.94
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readahead_example.txt
3.17
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reset-trace_example.txt
9.15
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rubycalls_example.txt
3.91
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rubyflow_example.txt
5.88
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rubygc_example.txt
3.78
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rubyobjnew_example.txt
2.97
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rubystat_example.txt
2.98
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runqlat_example.txt
31.3
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runqlen_example.txt
11.85
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runqslower_example.txt
2.13
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shmsnoop_example.txt
2.73
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slabratetop_example.txt
5.22
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sofdsnoop_example.txt
3.14
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softirqs_example.txt
11.02
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solisten_example.txt
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sslsniff_example.txt
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stackcount_example.txt
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statsnoop_example.txt
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swapin.txt
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swapin_example.txt
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syncsnoop_example.txt
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syscount_example.txt
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tclcalls_example.txt
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tclflow_example.txt
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tclobjnew_example.txt
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tclstat_example.txt
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tcpaccept_example.txt
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tcpcong_example.txt
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tcpconnect_example.txt
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tcpconnlat_example.txt
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tcpdrop_example.txt
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tcplife_example.txt
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tcpretrans_example.txt
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tcprtt_example.txt
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tcpstates_example.txt
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tcpsubnet_example.txt
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tcpsynbl_example.txt
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tcptop_example.txt
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tcptracer_example.txt
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threadsnoop_example.txt
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tplist_example.txt
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trace_example.txt
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ttysnoop_example.txt
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vfscount_example.txt
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vfsstat_example.txt
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virtiostat_example.txt
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wakeuptime_example.txt
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xfsdist_example.txt
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xfsslower_example.txt
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zfsdist_example.txt
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zfsslower_example.txt
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Save
Rename
Demonstrations of xfsdist, the Linux eBPF/bcc version. xfsdist traces XFS reads, writes, opens, and fsyncs, and summarizes their latency as a power-of-2 histogram. For example: # ./xfsdist Tracing XFS operation latency... Hit Ctrl-C to end. ^C operation = 'read' usecs : count distribution 0 -> 1 : 0 | | 2 -> 3 : 362 | | 4 -> 7 : 807 |* | 8 -> 15 : 20686 |****************************************| 16 -> 31 : 512 | | 32 -> 63 : 4 | | 64 -> 127 : 2744 |***** | 128 -> 255 : 7127 |************* | 256 -> 511 : 2483 |**** | 512 -> 1023 : 1281 |** | 1024 -> 2047 : 39 | | 2048 -> 4095 : 5 | | 4096 -> 8191 : 1 | | operation = 'open' usecs : count distribution 0 -> 1 : 0 | | 2 -> 3 : 3 |****************************************| This output shows a bi-modal distribution for read latency, with a faster mode of 20,686 reads that took between 8 and 15 microseconds, and a slower mode of over 10,000 reads that took between 64 and 1023 microseconds. It's likely that the faster mode was a hit from the in-memory file system cache, and the slower mode is a read from a storage device (disk). This "latency" is measured from when the operation was issued from the VFS interface to the file system, to when it completed. This spans everything: block device I/O (disk I/O), file system CPU cycles, file system locks, run queue latency, etc. This is a better measure of the latency suffered by applications reading from the file system than measuring this down at the block device interface. Note that this only traces the common file system operations previously listed: other file system operations (eg, inode operations including getattr()) are not traced. An optional interval and a count can be provided, as well as -m to show the distributions in milliseconds. For example: # ./xfsdist -m 1 5 Tracing XFS operation latency... Hit Ctrl-C to end. 10:14:15: operation = 'read' msecs : count distribution 0 -> 1 : 1366 |****************************************| 2 -> 3 : 86 |** | 4 -> 7 : 95 |** | 8 -> 15 : 132 |*** | 16 -> 31 : 72 |** | operation = 'write' msecs : count distribution 0 -> 1 : 685 |****************************************| 10:14:16: operation = 'read' msecs : count distribution 0 -> 1 : 984 |****************************************| 2 -> 3 : 66 |** | 4 -> 7 : 67 |** | 8 -> 15 : 104 |**** | 16 -> 31 : 70 |** | 32 -> 63 : 12 | | operation = 'write' msecs : count distribution 0 -> 1 : 536 |****************************************| 10:14:17: operation = 'read' msecs : count distribution 0 -> 1 : 1262 |****************************************| 2 -> 3 : 75 |** | 4 -> 7 : 80 |** | 8 -> 15 : 119 |*** | 16 -> 31 : 75 |** | 32 -> 63 : 3 | | operation = 'write' msecs : count distribution 0 -> 1 : 639 |****************************************| 10:14:18: operation = 'read' msecs : count distribution 0 -> 1 : 1070 |****************************************| 2 -> 3 : 58 |** | 4 -> 7 : 74 |** | 8 -> 15 : 140 |***** | 16 -> 31 : 60 |** | 32 -> 63 : 5 | | operation = 'write' msecs : count distribution 0 -> 1 : 556 |****************************************| 10:14:19: operation = 'read' msecs : count distribution 0 -> 1 : 1176 |****************************************| 2 -> 3 : 53 |* | 4 -> 7 : 94 |*** | 8 -> 15 : 112 |*** | 16 -> 31 : 77 |** | 32 -> 63 : 3 | | operation = 'write' msecs : count distribution 0 -> 1 : 613 |****************************************| This shows a mixed read/write workload, where the slower read mode was around 10 ms. USAGE message: # ./xfsdist -h usage: xfsdist [-h] [-T] [-m] [-p PID] [interval] [count] Summarize XFS operation latency positional arguments: interval output interval, in seconds count number of outputs optional arguments: -h, --help show this help message and exit -T, --notimestamp don't include timestamp on interval output -m, --milliseconds output in milliseconds -p PID, --pid PID trace this PID only examples: ./xfsdist # show operation latency as a histogram ./xfsdist -p 181 # trace PID 181 only ./xfsdist 1 10 # print 1 second summaries, 10 times ./xfsdist -m 5 # 5s summaries, milliseconds