It is invalid in the sense described in the Principles of Operation paragraph about the "Page-Invalid Bit (I)" found in the discussion of the "Page-Table Entry": "the page-table entry cannot be used for translation." The fact that the operating system can resolve the invalidity by performing a page-in and then turning off the Page-Invalid Bit is not relevant to the invalidity of the page at the time of the S0C4 interrupt. DAT is unaware of operating system functions that may or may not occur long after the interrupt is generated. If the operating system cannot page-in the invalid page, then the invalidity changes from possibly temporary to seriously permanent.
Bill Fairchild Programmer Rocket Software 408 Chamberlain Park Lane * Franklin, TN 37069-2526 * USA t: +1.617.614.4503 * e: [email protected] * w: www.rocketsoftware.com -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Binyamin Dissen Sent: Tuesday, April 24, 2012 8:24 AM To: [email protected] Subject: Re: Explination of S0C4 reason code 4 and related data areas If the "invalid" page can be paged-in, in what way is it "invalid"? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
