It can learn. If you take ZFS as an example, it has both MRU (most recently used) and MFU (most frequently used) caches. Thus it can adapt to retaining memory

It can learn. If you take ZFS as an example, it has both MRU (most recently used) and MFU (most frequently used) caches. Thus it can adapt to retaining memory data which is accessed repeatedly as well as data which was just read which might get reused. It's not perfect, but it should do a good job with a sufficiently sized cache.