vfscount_example.txt

Demonstrations of vfscount, the Linux eBPF/bcc version.


This counts VFS calls, by tracing all kernel functions beginning with "vfs_":

# ./vfscount
Tracing... Ctrl-C to end.
^C
ADDR             FUNC                          COUNT
ffffffff811f3c01 vfs_create                        1
ffffffff8120be71 vfs_getxattr                      2
ffffffff811f5f61 vfs_unlink                        2
ffffffff81236ca1 vfs_lock_file                     6
ffffffff81218fb1 vfs_fsync_range                   6
ffffffff811ecaf1 vfs_fstat                       319
ffffffff811e6f01 vfs_open                        475
ffffffff811ecb51 vfs_fstatat                     488
ffffffff811ecac1 vfs_getattr                     704
ffffffff811ec9f1 vfs_getattr_nosec               704
ffffffff811e80a1 vfs_write                      1764
ffffffff811e7f71 vfs_read                       2283

This can be useful for workload characterization, to see what types of
operations are in use.

You can edit the script to customize what kernel functions are matched.