On Wednesday, 12/09/2015 at 08:15 GMT, Barton Robinson <bar...@velocitysoftware.com> wrote: > My request to get this fixed was rejected by ibm several years ago. The > problem is that even though linux doesn't have anything on the vdisk, > z/vm still has to back it. I asked for a diagnose as we do with real > storage - a way for Linux to tell z/vm the page no longer needs > backing. So after the swapoff, can you detach the vdisk? That's the > only way with current technology to tell CP to free it up.
The Linux community didn't like the memory state changes we asked for with CMM, so I don't see why they would assent to the change you describe. A disk is just another address space that would need the same information. And there's no such thing as "I'm done" with swapping. External software that is monitoring swapping patterns for a guest would need to determine that the need for swap space has passed, and take action. This might be a good reason to have a larger and smaller swapdisk. Leave the little one alone, and reset the larger one when appropriate. There's only so much a host can do. What I would say, however, is that there should be an easier way to reset the swap disk. E.g. possibly just re-formatting it could cause a formatted page to be released. We'd need some input from Bill Holder on that. Alan Altmark Senior Managing z/VM and Linux Consultant Lab Services System z Delivery Practice IBM Systems & Technology Group ibm.com/systems/services/labservices office: 607.429.3323 mobile; 607.321.7556 alan_altm...@us.ibm.com IBM Endicott ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
