You're correct, Marty, there are no back pointers from the allocation structures for a particular paging "slot" or volume back to the virtual p age or pages that reside there.
The problem with scanning the PGMBKs is, of course (in addition to there being lots and lots of them), that PGMBKs are themselves pageable, and so are not all in storage. A new routine could be written to scan all PGMBK s, including bringing in any that are paged out (or at least, copies of them ), but it's not exactly a small undertaking. If it were easy, we'd have add ed the "active DASD Drain / Migrate" function to find and migrate such pages long ago. Also, it's not at all a safe assumption that the "offending" page is a us er or guest page, it could just as easily be a CP page for some pageable CP utility space. - Bill Holder z/VM Development, IBM On Wed, 7 May 2008 21:44:45 -0400, Marty Zimelis <[EMAIL PROTECTED]> wrote: >Martha, > My recollection is that there's only an allocation bit map on a >page-extent basis. The only way I can think of to track down the page i s to >figure out what the CCPV value* is for the page, then traverse all the >PGMBKs for the suspect users, looking for a matching DASD slot "address" in >an ASATE. It's distinctly brute force and requires a lot of control blo ck >chasing, but another approach does not immediately come to mind. > >* CCPV= 2 bytes of cylinder number within the page extent, one byte of page >number within the cylinder, and one byte of index into the CPOWN list >(V=volume). > > Marty >____________________ >Martin Zimelis >Principal >maz/Consultancy > >> -----Original Message----- >> From: The IBM z/VM Operating System >> [mailto:[EMAIL PROTECTED] On Behalf Of Martha McConaghy >> Sent: Wednesday, May 07, 2008 12:49 PM >> To: IBMVM@LISTSERV.UARK.EDU >> Subject: Owner of a page >> >> I faintly recall that there is a way to find out who owns a >> page out on >> disk PAGE space, but can't recall how. I've got a page allocation out >> on an old disk that is set to be turned off. Its been >> drained for about >> 3 months, but there is 1 page allocated that never goes away. >> Something >> that doesn't get recycled obviously owns it, but I have a lot >> of virtual >> machines that never get recycled. It would help if I could figure out >> which owns it and just recycle that one. >> >> Any bright ideas? >> >> Martha >> >======================== ========================= ========================
