It has, and it is used less and less. Not sure if any OS never does it anywhere, but the important part is to remove it from all "hot paths", not to remove it w

It has, and it is used less and less. Not sure if any OS never does it anywhere, but the important part is to remove it from all "hot paths", not to remove it where its not relevant. Can't say if they still do, but FreeBSD for the longest time used to list the floppy driver being one of the modules using GiantLock and that was a problem for what I guess was about zero people. But if one asks fbsd devs if they still have it, they would have to answer yes, even if the rest of the OS runs super great without locks anywhere else, so the binary question of "is there somewhere something that for some time could possibly call the giant lock" isn't very interesting, but rather "will it do it for the tasks I imagine I will run on my machine?" and that would have to be a more fine-grained question with some research, just like the locks in the kernels are getting more and more fine-grained.