On Mon, 21 Apr 2014 07:01:50 -0500, Tom Marchant wrote: >On Fri, 18 Apr 2014 14:07:29 -0500, Paul Gilmartin wrote: > >>Are there separate pools of real storage for above the bar and below the bar? > >Pools? No. Pools are a software concept. > >Real storage with real addresses < 2 GiB are below the bar. >Real storage with real addresses > 2 GiB are above the bar. > ITYM ">= 2 GiB"
But what do you call real storage with a real address = 3 GiB or thereabouts? I understand that for historic reasons, pertaining only to z/OS, not other OSes, 2 GiB <= virtual address < 4GiB is prohibited, and GETMAIN (STORAGE?) for even 64-bit addressable storage will not return storage in that area. But why? What harm would befall if it did? >A GETMAIN request can specify whether the storage is to be backed by real >storage < 16 M, <2 G, or anywhere. > Why should the application even care? Doesn't virtual storage appear the same regardless where it's physically backed? -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
