One possibility that occurred to me that would cause this "page in only to release" behavior is if Linux has the pages to be released on a linked list, and the linked list is maintained with pointers in the pages themselves, rather than an outside structure. If that's the case, then Linux has to reference the forward pointer in the page, causing it to be read in, before it can be released. I've asked our Linux folks if this is possibly the case, and if so, what might be done to address it. But it's definitely not z/VM CP reading in guest data pages only to release them, that's just not what the code does.
- Bill Holder, z/VM Development, IBM "Much that once was is lost, for none now live who remember it." - Galadriel "He that breaks a thing to find out what it is has left the path of wisdom" - Gandalf (JRR Tolkein) ---------------------------------------------------------------------- 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/
