Hi, Thank you, this is a very interesting read. I will share this with friends as soon as this is publicly available in the TUHS archives. We see premices of the Linux Copy-On-Write forking method! I also note that they decided to avoid a global kernel lock. Sebastien Le 19/07/2023 à 03:08, Tom Lyon a écrit : > This is perhaps the first significant document I wrote at Amdahl. > Although undated, I believe this was written in August 1979, after I > had attended a 2 week class at IBM Chicago about VM//370(CP) > internals and performance. > > The paper makes reference to V7 UNIX being "on order", so this is > when the V6 UNIX system was in use.  IIRC, V7 UNIX was released in > Nov. of 1979. > > https://drive.google.com/file/d/1cB2eqTwmicj1AQOiULDZjED5Rq-_V4N4/view?usp=… > > > Huge thanks to my friend Karl D. for hanging on to this for 44 years.