Should a new fresh GC for D store block metadata inside the page itself or in a (pool) structure separate from the page?

I'm already aware of Dmitry's suggestion to separate value-type pools from pools of types possibly containing addresses.

On Tuesday, 2 October 2018 at 07:25:36 UTC, Per Nordlöw wrote:
> Should a new fresh GC for D store block metadata inside the page itself or in a (pool) structure separate from the page?
>
> I'm already aware of Dmitry's suggestion to separate value-type pools from pools of types possibly containing addresses.

I guess you would want to scan the metadata without thrashing all the pages. Keeping metadata together compactly is good for cache. Of course it depends on how exactly it's going to be used.

On Tuesday, 2 October 2018 at 09:43:02 UTC, thedeemon wrote:
> I guess you would want to scan the metadata without thrashing all the pages. Keeping metadata together compactly is good for cache.

Can you briefly elaborate on what use case(s) you hade in mind when you wrote this?