Re: [PATCH 2/6] vkd3d: Implement support for persistently mapped HOST_VISIBLE heaps.

[Henri Verbeet]

On Mon, 30 Sep 2019 at 17:48, Hans-Kristian Arntzen
 wrote:
> Greatly reduces number of maps for applications which do not do this
> themselves. Also add a config option to use older map-on-demand
> behavior, which might be nice for debugging tools.

I don't want to just say no, but this does seem to go against the
spirit of an "explicit" API like d3d12 somewhat. My other concern with
this is that while on 64-bit we typically have plenty of address
space, things can be a bit more tight on 32-bit. I assume the main
justification for this patch is performance; do you have some numbers?