Intelligent caching

[Lukas Fleischer]

Hi,

Reading through our caching code, I wondered why we don't make it a bit
more clever. For every dynamically created page, we could just store a
fingerprint that can be computed quite fast and indicates whether the
cache slot is still up-to-date or not.

For example, on the log pages, we could save the commit the
corresponding ref points to and invalidate the cache slot when the ref
has changed. Using that, we could use the power of caching and never
deliver outdated pages at the same time.

What do you think about that?

Regards,
Lukas