I don’t believe the paging implications would be any different from an XC.

Sent from my iPhone

> On Apr 14, 2022, at 1:26 PM, Paul Gilmartin 
> <00000014e0e4a59b-dmarc-requ...@listserv.uga.edu> wrote:
> 
> On Apr 14, 2022, at 11:06:09, Tom Harper wrote:
>> 
>> IMHO, the next instruction to add to z/Architecture would be an instruction 
>> to clear storage to zeros. 
>> 
> Would that cause a Lot of paging I/O?  Would it be better to mark all pages as
> invalid, to be cleared automatically when referenced, if ever?
> 
> That would be an O/S function, not hardware.
> 
> -- 
> gil


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