Not perfect but suitable book considering the small number of books about linux internals. IMHO most useful is chapter 10, so below is brief summary of the presented tools
- vfsstat, VFS, eBPF-based
- vfscount, VFS, eBPF-based
- fsrwstat, VFS, eBPF-based, can aggregate stat for each filesystem
- filetop, eBPF-based
- cachestat Cache, from perf-tools
- cachetop, Cache, eBPF-based
- btrfsslower, ext4slower, xfsslower etc - eBPF-based
- biotop, eBPF-based, for block layer
- biosnoop, eBPF-based, for block layer
- blktrace, for block layer
- iostat, iotop & vmstat are well-known