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Edit File: vfsstat_example.txt

Demonstrations of vfsstat, the Linux bpftrace/eBPF version. This traces some common VFS calls (see the script for the list) and prints per-second summaries. # ./vfsstat.bt Attaching 8 probes... Tracing key VFS calls... Hit Ctrl-C to end. 21:30:38 @[vfs_write]: 1274 @[vfs_open]: 8675 @[vfs_read]: 11515 21:30:39 @[vfs_write]: 1155 @[vfs_open]: 8077 @[vfs_read]: 10398 21:30:40 @[vfs_write]: 1222 @[vfs_open]: 8554 @[vfs_read]: 11011 21:30:41 @[vfs_write]: 1230 @[vfs_open]: 8605 @[vfs_read]: 11077 21:30:42 @[vfs_write]: 1229 @[vfs_open]: 8591 @[vfs_read]: 11061 ^C Each second, a timestamp is printed ("HH:MM:SS") followed by common VFS functions and the number of calls for that second. While tracing, the vfs_read() kernel function was most frequent, occurring over 10,000 times per second. There is another version of this tool in bcc: https://github.com/iovisor/bcc The bcc version provides command line options.