Linus Torvalds (torvalds.delete@this.linux-foundation.org) on July 29, 2022 11:20 am wrote:
>
> You simply don't want a situation where all your memory is your long-term image. The whole "if
> you lose power, you reboot and just continue" thing is mindless blathering. Exactly because it
> makes a fundamental mistake in assuming that everything is always perfect and bug-free.

I have developed small embedded systems which could do that with critical state stored in either EEPROM or CMOS SRAM with backup power. Some old test instrumentation used battery backed up SRAM as main memory, and would pick up exactly where it lost power, but I do not think that would be practical now at least in that way. At the time, common CMOS SRAM was fast enough to be treated as main memory.

It is not quite the same thing, but I have done some application programming where it was convenient to keep state on mass storage which allowed the program to be modified and then restarted without interrupting operation. This required an entire section of code for loading external state at startup, and then continuously updating state as required.