Huge Mono-repositories in Git/Hg

Very valuable article about mono-repositories in Git/Hg: 
http://blog.ffwll.ch/2017/08/github-why-cant-host-the-kernel.html

In nutshell:

• There is two ways of scaling big-fat project if single repository going slow you down:

1. Split project on SUB-project with its own repos. As result - you will have splitting problem, dependency-hell, wide refactoring become hard, unsupported version mixes with “please upgrade everything first” suggestions in bug-tickets.
2. Keep all in same repo but create separate repos for separate functionality/work, with very active pull-requests between repos.
• Current GitHub don't really support "advanced" pull requests and bug-tracking across repositories as required in #2.
• Linux kernel and Windows OS use #2 because #1 is not an option.
• Windows https://www.visualstudio.com/learn/gvfs-design-history/ 

Links:

• https://medium.com/@maoberlehner/monorepos-in-the-wild-33c6eb246cb9
• https://developer.atlassian.com/blog/2015/10/monorepos-in-git/