Welp, back in college I wrote a virtual memory demand pager for IBM 370 mainframe. I also read the entire 4.3BSD kernel source, as well as the Minix kernel source, and hacked on both of them. Also ported NFS server and client to the mainframe. After college, wrote VMEbus device drivers for Sun4 SPARC/Solaris, and a couple drivers for Linux and Windows as well. I'm pretty familiar with what any given kernel does.
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