Comment by rockwotj

IIRC (it’s been awhile) this was an optimization that was inspired by someone noticing all of Google spent a lot of time in vDSO using https://research.google/pubs/google-wide-profiling-a-continu... Google generally doesn’t have any (well that I have ever heard of) hard realtime requirements like the high frequency trading or HPC systems do.

Cool stuff thanks for sharing!