How didn't I know vdso worked like this?: http://prefetch.net/blog/index.php/2017/12/05/speeding-up-frequently-accessed-system-calls-with-vdso/ …
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Hey
@marcan42! Your article was one of the best I've read in a long, long time. I guess I made an incorrect assumption when I read "Finding the vDSO" section in vdso(7). Have you found any good guides explaining how this is implemented under the covers? Thanks again for post!
I'm not aware of anything better than vdso(7) and Documentation/ABI/stable/vdso (which has even less info). It's pretty much just memory that appears magically mapped into all processes.