1Demonstrations of vfsstat, the Linux eBPF/bcc version. 2 3 4This traces some common VFS calls and prints per-second summaries. By default, 5the output interval is one second: 6 7# ./vfsstat 8TIME READ/s WRITE/s CREATE/s OPEN/s FSYNC/s 918:35:32: 231 12 4 98 0 1018:35:33: 274 13 4 106 0 1118:35:34: 586 86 4 251 0 1218:35:35: 241 15 4 99 0 1318:35:36: 232 10 4 98 0 1418:35:37: 244 10 4 107 0 1518:35:38: 235 13 4 97 0 1618:35:39: 6749 2633 4 1446 0 1718:35:40: 277 31 4 115 0 1818:35:41: 238 16 6 102 0 1918:35:42: 284 50 8 114 0 20^C 21 22 23Here we are using an output interval of five seconds, and printing three output 24lines: 25 26# ./vfsstat 5 3 27TIME READ/s WRITE/s CREATE/s OPEN/s FSYNC/s 2818:35:55: 238 8 3 101 0 2918:36:00: 962 233 4 247 0 3018:36:05: 241 8 3 100 0 31 32 33Full usage: 34 35# ./vfsstat -h 36usage: vfsstat [-h] [-p PID] [interval] [count] 37 38Count some VFS calls. 39 40positional arguments: 41 interval output interval, in seconds 42 count number of outputs 43 44optional arguments: 45 -h, --help show this help message and exit 46 -p PID, --pid PID trace this PID only 47 48examples: 49 ./vfsstat # count some VFS calls per second 50 ./vfsstat -p 185 # trace PID 185 only 51 ./vfsstat 2 5 # print 2 second summaries, 5 times 52