On 10/19/2016 3:35 PM, Greg Dyck wrote:
On 10/19/2016 7:51 AM, Peter Hunkeler wrote:
But the net seems to be, my assumption is wrong. If an area >4k is
PGFIXed, then I need to find the real address of every page and
cannot assume the real storage is contiguous.
This is a correct statement. PGFIXing storage guarantees the page is
assigned to a real frame and the real address of the frame can not
change. But the real frames used for this will only be contiguous by
chance.
Current GA z/VM _still_ has no support for large guest pages! So, while
the world waits for EDAT support to be implemented by the z/VM
developers, we have code that briefly fixes a large virtual storage area
and then inspects it (using LRAG) to find the largest contiguous area we
can get (up to a max of 16 4K pages I think) where both virtual and real
addresses are contiguous. We unfix and free everything else but this area...
--
Edward E Jaffe
Phoenix Software International, Inc
831 Parkview Drive North
El Segundo, CA 90245
http://www.phoenixsoftware.com/
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