There's no one keeping track of that as far as I know, but the group picture of kernel maintainers (just picked the first one google brought up) is fairly infor

There's no one keeping track of that as far as I know, but the group picture of kernel maintainers (just picked the first one google brought up) is fairly informative on your questions. https://lwn.net/Articles/705244/ https://lwn.net/Articles/705244/ I wouldn't say that the kernel community is a success storie in this regard ...