A (one-off) bpftrace script to look for the top 10 userspace callers of the following:

• vfs_statfs
• Variants of stat(2): newstat, newlstat, newfstat, newfstatat
• nfs4_getattr
• nfs4_xdr_enc_getattr

To use:

1. Download stat.bt
2. Run bpftrace stat.bt|tee stat_out.txt, and hit Ctrl-C after a few minutes.
3. stat_out.txt can later be processed to get the statistics we need.