> -----Original Message----- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On > Behalf Of Gord Tomlin > Sent: 14 December, 2017 14:45 > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Re: RSM Freemained Frames - When do they apply? > > 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. > > -- >
What does this exactly mean: "freemained frames"? Is it just a counter or do they refer to specific frames, that are kept at hand in the address space for faster assignment of new frame requests? I am not surprised that those frames, if they are "available" at all, are not accessible anymore and access is punished with the same 0C4 as any other not getmained frame. Kees. ******************************************************** For information, services and offers, please visit our web site: http://www.klm.com. This e-mail and any attachment may contain confidential and privileged material intended for the addressee only. If you are not the addressee, you are notified that no part of the e-mail or any attachment may be disclosed, copied or distributed, and that any other action related to this e-mail or attachment is strictly prohibited, and may be unlawful. If you have received this e-mail by error, please notify the sender immediately by return e-mail, and delete this message. Koninklijke Luchtvaart Maatschappij NV (KLM), its subsidiaries and/or its employees shall not be liable for the incorrect or incomplete transmission of this e-mail or any attachments, nor responsible for any delay in receipt. Koninklijke Luchtvaart Maatschappij N.V. (also known as KLM Royal Dutch Airlines) is registered in Amstelveen, The Netherlands, with registered number 33014286 ******************************************************** ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
