[no subject]

      Normally, the kernel uses a stock readahead logic that is well
      understood and well tuned. This option enables a much complex and
      feature rich one. It is more aggressive and memory efficient in
      doing readahead, and supports some less-common access patterns such
      as reading backward and reading sparsely. However, due to the great
      diversity of real world applications, it might not fit everyone.

- Luke