On Mon, 2002-11-25 at 19:46, Ferguson, Neale wrote: > On another, unrelated but equally newbie topic - while TRACEing around the > Linux guest, I saw what seemed an alarming number of PROG 4's (not the > expected page and segment translation exceptions, which I also see). In > systems with which I'm more familiar, this number of protection exceptions > (48 during a "who") would have meant a serious coding problem. But I see > no indication of any error. Should I assume this is just part of normal > Linux operation?
I'm not up on the S/390 architecture code but the standard Linux behaviour to generate page aging data in the absence of dirty flags is to force pages read only and take the protection fault internally.
