> > > > Normally swapping mechanism choose the Least Recently Used(LRU) pages > > of a process to be swapped out. When KVM uses MMU notifier in linux > > kernel to implement swapping for VM, could KVM choose LRU pages of a > > VM to swap out? If so, could you give a brief description about how > > this is implemented? > > > > The Linux memory manager approximates LRU by scanning pages for the > accessed bit, which is set in the pte by the processor when a page is > accessed through that pte. mmu notifiers provide a callback for the > check, so that kvm can check the accessed bit on the shadow ptes.
Linux kernel maintains a reverse mapping from a page frame to all page tables pointing to this page frame. Does KVM need to maintain a similar reverse mapping from a page frame to all shadow page tables pointing to this page frame? I should have read the code to find the answer. But it's appreciated if you could give a quick answer :) Thanks, Forrest ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
