No, I was going for Page Fault[1], which, if I recall my comp. arch. lectures, suspends the requesting process until the required page has been read from disk a

No, I was going for Page Fault[1], which, if I recall my comp. arch. lectures, suspends the requesting process until the required page has been read from disk and put in memory somewhere. So wall-clock time passes, but the process itself doesn't know about it until it resumes. Even then, I don't think it can know definitively why it was suspended - it could just as well have been pre-empted by some other task. [1] https://en.wikipedia.org/wiki/Page_fault https://en.wikipedia.org/wiki/Page_fault