On Wednesday 06 June 2007, Jun Koi wrote: > About the balloon driver, I looked at the current code, and what I > dont like is its approach: it needs to be operated from inside the > guest, which is not the way we usually want to do. So something like > Xen balloon driver is certainly better.
There are multiple fundamentally different approaches. Three of these have been used on s390 with success, and they are not mutually exclusive: 1. Balloning: The guest voluntarily gives up pages using an hcall if it has free pages or is told to do so by the hypervisor. 2. pfault: The host takes away pages from the guest based on LRU. When the guest accesses a page that has been paged out by the host, it gets an exception and has the chance to switch the guest task. Another exception is delivered when the page is there, and the task gets marked runnable again. 3. "cmm2": The guest annotages every page as 'unused', 'stable', 'volatile' or 'potentially volatile', and the host memory management code can take these into consideration. See https://ols2006.108.redhat.com/reprints/schwidefsky-reprint.pdf for details. Arnd <>< ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
