On 2017-12-14 07:04, Peter Hunkeler wrote:
Running z/OS V2.2 on a z13. "D DIAG" shows FREEMAINEDFRAMES(YES)
I'm not trying to solve any specific problem. I'm just curious.
I'd like to see the behaviour in different situations when real storage (frames) has been
kept as part of RSMs new "freemained frames" feature after the virtual storage
has been released (freemained).
Sample program is obtaining a couple of 10MiB areas, then assessing each page
so to make sure it is backed with real storage. Some of the areas are then
released again. I was expecting to be able to still access the released pages
because RSM decided to keep the frames. Am getting S0C4 instead.
Obviously, RSM considers it unnecessary to keep the frames as freemained frames.
What, if anything, can I do to have RSM keep the frames when the storage is
released?
--
Peter Hunkeler
I wouldn't think IBM would be in a hurry to reveal RSM's algorithm for
determining whether/when a freemained frame will be discarded. I know
you are just asking out of curiosity, but any reliance on a freemained
frame staying available would be like Russian roulette.
--
Regards, Gord Tomlin
Action Software International
(a division of Mazda Computer Corporation)
Tel: (905) 470-7113, Fax: (905) 470-6507
Support: https://actionsoftware.com/support/
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