| Demonstrations of vfsstat, the Linux eBPF/bcc version. |
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| This traces some common VFS calls and prints per-second summaries. By default, |
| the output interval is one second: |
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| # ./vfsstat |
| TIME READ/s WRITE/s CREATE/s OPEN/s FSYNC/s |
| 18:35:32: 231 12 4 98 0 |
| 18:35:33: 274 13 4 106 0 |
| 18:35:34: 586 86 4 251 0 |
| 18:35:35: 241 15 4 99 0 |
| 18:35:36: 232 10 4 98 0 |
| 18:35:37: 244 10 4 107 0 |
| 18:35:38: 235 13 4 97 0 |
| 18:35:39: 6749 2633 4 1446 0 |
| 18:35:40: 277 31 4 115 0 |
| 18:35:41: 238 16 6 102 0 |
| 18:35:42: 284 50 8 114 0 |
| ^C |
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| Here we are using an output interval of five seconds, and printing three output |
| lines: |
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| # ./vfsstat 5 3 |
| TIME READ/s WRITE/s CREATE/s OPEN/s FSYNC/s |
| 18:35:55: 238 8 3 101 0 |
| 18:36:00: 962 233 4 247 0 |
| 18:36:05: 241 8 3 100 0 |
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| Full usage: |
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| # ./vfsstat -h |
| usage: vfsstat [-h] [-p PID] [interval] [count] |
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| Count some VFS calls. |
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| positional arguments: |
| interval output interval, in seconds |
| count number of outputs |
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| optional arguments: |
| -h, --help show this help message and exit |
| -p PID, --pid PID trace this PID only |
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| examples: |
| ./vfsstat # count some VFS calls per second |
| ./vfsstat -p 185 # trace PID 185 only |
| ./vfsstat 2 5 # print 2 second summaries, 5 times |
