I quoted from this one, https://linux.die.net/man/2/readahead https://linux.die.net/man/2/readahead There is a second obstacle I have in mind, around the robus

I quoted from this one, https://linux.die.net/man/2/readahead https://linux.die.net/man/2/readahead There is a second obstacle I have in mind, around the robustness of this. Imagine if we had an implementation of that which reliably returned quickly. But we take our time doing the subsequent read. By the time we do, the value has already been chased out of the cache. It is an edge-case, and you could probably avoid it in practice, but it would be significant effort to to verify your mechanism, and would create cognitive load.