How to solve the 'boot storm' problem: BCACHE

Some solutions Way 1. Add more cpus.(ABANDONED) Way 2. Add a SSD as "boot cache" Way 3. Sort the boot process

POC: Way 2: Sometimes we need cache the boot section of the OS into a SSD, since no SSD on hand, let's try to use a block device made in /dev/shm

Way 3: Considering that the parallelization of the "boot action", we have to predict the action in the near future