modules: add platformOptimizations

[RTUnreal]

These settings are taken from the steamos-customizations-jupiter package on SteamOS.

[fufexan]

Is this supposed to be used with https://github.com/Jovian-Experiments/Jovian-NixOS?

[RTUnreal]

No, it is just a standalone config for settings, some people might want to use

[fufexan]

Perhaps you could also add a section for the module in the readme, in the same manner as for pipewire low-latency.

[NotAShelf]

I'm not sure if I like the module name. Much rather give it a blanket name (e.g. programs.steam.platformOptimizations) that can be extended later on.

Also, I believe the vm map count is specific/optimized for x86_64 platforms so that might be worth setting based on host platform.

[RTUnreal]

I'm not sure if I like the module name. Much rather give it a blanket name (e.g. programs.steam.platformOptimizations) that can be extende later on.

Also, I believe the vm map count is specific/optimized for x86_64 platforms so that might be worth setting based on host platform.

I am not picky about the name. If you have a better suggestion, then please share it.

[RTUnreal]

But also after searching for a bit, It is not necesary as, like the comment says, the kernel uses an int. And from what I can tell, on all NixOS platforms int = 32bit integer

[fufexan]

I'm also in favor of renaming the option to programs.steam.platformOptimizations.enable, like raf said.

[fufexan]

LGTM

@NotAShelf do you have anything to add?

[NotAShelf]

I could nit the enable option description, but really not worth the trouble. LGTM.

[RTUnreal]

If it is described too confusingly, then go ahead and nit it. Descriptions are meant to be descriptive. 👍

[NotAShelf]

Nothing to do with descriptiveness. It's good enough, I'm just worried about future-proofing - e.g. we might want to add alternative/extra lines that are not set in SteamOS, but that's not too big of a deal. Worst case, we'll redo the description in the future.