Hi, People. My cent to this discussion. We are talking about pages on dasd, not pages in memory. So, these pages already was swapped. Except some control pages, I think.
To free the dasd, VM will need: Know what pages are on the specific dasd. It can be done by "Page out" routines, updating one table. Drain the dasd, to prevent new allocation Put on the bit to force a "Page In" for the pages on that dasd. Returning to normal page process. After some time, no pages are on this dasd. It can be purged from the page tables, removing the control pages. Of course, it is not so simple to implement, but looks like viable. What do you, the experts, think about? ______________________________________________ Clovis From: Scott Rohling <scott.rohl...@gmail.com> To: LINUX-390@vm.marist.edu Date: 17/06/2011 12:59 Subject: Re: z/VM page space Sent by: Linux on 390 Port <LINUX-390@vm.marist.edu> > > > > Hi David - one further comment - although it is indeed typical to see some > CP owned pages written immediately after the system IPL, it's really not > safe to make the assumption that that is the only time it will happen, In > particular, the ISFC and Virtual Free Storage spaces are pageable, > and page reference activity, and therefore paging behavior, for them > can be driven at times other than system IPL. > > Bill Holder, Senior Software Engineer > > I'm curious about why CP would write pages immediately after IPL? At that point, there is likely sufficient memory and paging isn't needed.. so why not wait until it is? I'm sure there's a good explanation - just wondering... Scott Rohling ---------------------------------------------------------------------- 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/ ---------------------------------------------------------------------- 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/
