i think the key issue here is managing the asynchrony. which is sadly still a bit of a pain. you're absolutely right that you shouldn't have two page caches. b

i think the key issue here is managing the asynchrony. which is sadly still a bit of a pain. you're absolutely right that you shouldn't have two page caches. but its entirely likely that the database has explicit lifetime and policy information that would make it a more effective cache owner. but sure, if you're just going to do a blind LRU, by all means leave it to the kernel.