Demonstrations of vfscount, the Linux eBPF/bcc version.


This counts VFS calls  during time, by tracing all kernel functions beginning 
with "vfs_", By defaults, the time is 99999999s
# ./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

Here we are using an output in 10 seconds, and printing 10 seconds summaries
# ./vfscount 10
Tracing... Ctrl-C to end.

ADDR             FUNC                          COUNT
ffffffffa1283671 vfs_rename                        1
ffffffffa129f471 vfs_setxattr                      1
ffffffffa12831c1 vfs_mkdir                         1
ffffffffa1282a51 vfs_rmdir                        10
ffffffffa1283f31 vfs_unlink                       28
ffffffffa1273e61 vfs_writev                       53
ffffffffa12ae061 vfs_statfs                       55
ffffffffa129e971 vfs_getxattr                    138
ffffffffa1288561 vfs_readlink                    157
ffffffffa12d6311 vfs_lock_file                   223
ffffffffa1274da1 vfs_write                       537
ffffffffa12798f1 vfs_statx_fd                   2337
ffffffffa1279971 vfs_statx                      3064
ffffffffa1271ba1 vfs_open                       4334
ffffffffa12798b1 vfs_getattr                    4823
ffffffffa1279821 vfs_getattr_nosec              4823
ffffffffa1274af1 vfs_read                       9060


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.

Full usage:

# ./vfscount.py -h
USAGE: ./vfscount.py [time]