The undocumented TRAP name in DIAGxx was something I added at very low cost for my use. For documented things, we have a more extensive (and thus costly) process, including: - Design documents - Design document reviews - Formal testing - Interface Change Notification to software vendors - T3 Education for ESP customers - Service Education for Level2/Level3 And if we are changing a default behavior: - Migration Actions
If I wanted to spend some serious $$$ on protecting the partial pages, I would look into creating a new subpool specifically for REFR modules, and changing IEWFETCH and the PMLoader to use real addresses for doing relocation (as the PMLoader does during page fault processing for a program object which uses deferred loading). Do you know all of the places in the documentation that need to be updated when adding a new subpool? I don't. But I have come across places that were missed when other subpools were added. Jim Mulder z/OS Diagnosis, Design, Development, Test IBM Corp. Poughkeepsie NY "IBM Mainframe Discussion List" <IBM-MAIN@LISTSERV.UA.EDU> wrote on 08/30/2021 05:28:50 PM: > From: "Charles Mills" <charl...@mcn.org> > To: IBM-MAIN@LISTSERV.UA.EDU > Date: 08/30/2021 08:51 PM > Subject: Re: RENT binder option > Sent by: "IBM Mainframe Discussion List" <IBM-MAIN@LISTSERV.UA.EDU> > > > RoundUp is a suspected carcinogen. > > Should have referenced a bug killer rather than a weed killer, no? > CsvSP252BlackFlag? > > > Document it. What's IBM trying to protect via obscurantism? > > Not having to document it LOL. I suppose not having to provide it on > an ongoing, "upward compatible" basis. > > Seriously, I agree with @Gil. Wasting a few bytes should be the > default, not leaving a few bytes unprotected. > > Charles > > > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU > ] On Behalf Of Paul Gilmartin > Sent: Monday, August 30, 2021 1:41 PM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Re: RENT binder option > > On Mon, 30 Aug 2021 13:10:50 -0400, Jim Mulder wrote: > > > > On a test system, you may specify the undocumented > >CsvSP252RoundUp TRAPS name in DIAGxx. For a module > >being loaded into subpool 252, that will round the length up to > >a 4K multiple. > > > Document it. What's IBM trying to protect via obscurantism? > (Cf. Tom Brennan's ply.) > > What's the harm in specifying CsvSP252RoundUp TRAPS on a > production system? I suspect: > > o Squandering a couple slack KiB for each module loaded. > > o Possible program checks in poorly implemented vendor products. > Conscientious vendors should be willingly repair those (what > would IBM do?) > > o RoundUp is a suspected carcinogen. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
