IBM Mainframe Discussion List <[email protected]> wrote on 06/04/2009
04:31:36 PM:
> Allocate a one-MB object above the bar, page fix it, get the 64-bit
> real address of the starting virtual address, the 64-bit real
> address of the starting virtual address +4K, and off bits 51-63
> (with a mask of X'FFFFFFFFFFFFE000') of both addresses, and compare
> the two real addresses that are left after the and operation. If
> they are equal, then you have large page support.
>
Not necessarily. You could have happened to get sequential real frames
assigned to your sequential 4K pages.
You may be able to infer something from:
BROWSE SYS1.MODGEN(IARRCE)
RCEReconLFASize DS 0D Size of the Reconfigurable @M2A
* Large Frame Area in Megabytes @M2A
DS F @M2A
RCEReconLFASize31 DS F @M2A
RCENonReconLFASize DS 0D Size of the Non-Reconfigurable @M2A
* Large Frame Area in Megabytes @M2A
DS F @M2A
RCENonReconLFASize31 DS F @M2A
RCEReconLFAUsed DS 0D Number of 1MB frames in the @M2A
* Reconfigurable Large Frame @M2A
* Area that are allocated @M2A
DS F @M2A
RCEReconLFAUsed31 DS F @M2A
RCENonReconLFAUsed DS 0D Number of 1MB frames in the @M2A
* Non-Reconfigurable Large Frame @M2A
* Area that are allocated @M2A
DS F @M2A
RCENonReconLFAUsed31 DS F @M2A
RCELFTHR DS F Threshhold number of available
* large frames needed in order to
* satisfy non-pref requests from
* the large frame area @M3A
RCELFAvailGroups DS F Count of available large frames
* groups @M3A
RCELSAFC DS F Count of available single large
* frames @PKC
Jim Mulder z/OS System Test IBM Corp. Poughkeepsie, NY
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