On 6/10/2019 5:47 AM, John McKown wrote:
If I do a STORAGE OBTAIN,STARTBDY=20,LOC=(31,PAGEFRAMESIZE1M) is there any way to see if z/OS did indeed use a 1 Meg frame size? I am trying to get (and FIX) a contiguous area of real storage to use in communicating to z/VM via the DIAG X'08' (Virtual Console Function). In order to work, the entire area (and I want more than 4K) must be contiguous in real memory. I was hoping that PAGEFRAMESIZE1M would do that, but it appear to be a desire, not a demand.
Everyone has this same problem. Visibility to "is this fixed?" and/or "is this a 4K, 1M or 2G frame?" is frustratingly obscured for those not in supervisor state.
We run our code in supervisor state and look at the PFTE in the PFTCADS when we want to know if storage is fixed. We use LPTEA if we want to know which type of frame is in use.
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