> Just a perhaps crazy idea. > - Add new page volumes > - drain all old page vlumes to stop adding new data there > - for each Linux, one at a time change the reserved memory to the same as m= > emsize > (for this to work, z/VM now must restore all paged memory into real memor= > y) > - wait until this is done (hehe, have no clue here about the time or how to= > check it out, sorry) > - remove that reserved memory (or is it dedicated?) > - and all new paging will we on the new page volumes > > Any chance this can work anyone ? :) > > Cordialement / Vriendelijke Groeten / Best Regards / Med V=E4nliga H=E4lsni= > ngar > Tore Agblad
Hi - there are (at least) two problems: First, issuing SET RESERVED does not cause z/VM to actively restore (page in) any paged-out pages (make them resident in storage), it merely prevents any more from being stolen. Second, the SET RESERVED protection is not absolute - if the Demand Scan (page replacement) function reaches the 3rd pass emergency scan, the SET RESERVED setting is not honored and the pages will be taken away anyway. z/VM provides no permanent way to dedicate storage. However, this approach might work (for user pages) if the CP LOCK command is used rather than SET RESERVED - LOCK will bring the pages in. However, there are various things the guest program may choose to do to defeat the LOCK command (any page release function such as Diag x'10'), and it also won't help with CP system-owned pages (including vdisk pages, for what it's worth), which cannot be locked via the CP LOCK command. Bill Holder, Senior Software Engineer IBM z/VM Development, Memory Management, Endicott, NY Phone: 607-429-3640 IBM TieLine: 620-3640 ---------------------------------------------------------------------- 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/
