Enabling some coopetition among caches by periodically adjusting their sizes, giving more RAM to the most efficient one (higher hit/miss ratio) while shrinking

Enabling some coopetition among caches by periodically adjusting their sizes, giving more RAM to the most efficient one (higher hit/miss ratio) while shrinking the least efficient one, may let the whole system 'walk' toward the soft point where all caches stay nearby their peak efficiency, or at least alleviate avoidable thrashing. A first model may lay on memory ballooning and a PID loop. I could not find any pertinent software. > We should not conflate the two use-cases Exactly the point! Most hints/principles aren't generic but are stated with insufficient description of their pertinent contexts, especially on online boards and chats channels. It impacts most 'best practices' and code snippets.