Linux on s390 as a guest under z/VM has been using the guest page hinting interface (alias collaborative memory management) for a long time. The full version with volatile states has been deemed to be too complicated (see the old discussion about guest page hinting e.g. on http://marc.info/?l=linux-mm&m=123816662017742&w=2). What is currently implemented for the guest is the unused and stable states to mark unallocated pages as freely available to the host. This works just fine with z/VM as the host. The two patches in this series implement the guest page hinting interface for the unused and stable states in the KVM host. Most of the code specific to s390 but there is a common memory management part as well, see patch #1. The circus is back ;-) Konstantin Weitz (2): mm: add support for discard of unused ptes s390/kvm: support collaborative memory management arch/s390/include/asm/kvm_host.h | 8 +++- arch/s390/include/asm/pgtable.h | 24 ++++++++++++ arch/s390/kvm/kvm-s390.c | 24 ++++++++++++ arch/s390/kvm/kvm-s390.h | 2 + arch/s390/kvm/priv.c | 37 ++++++++++++++++++ arch/s390/mm/pgtable.c | 77 ++++++++++++++++++++++++++++++++++++++ include/asm-generic/pgtable.h | 13 +++++++ include/linux/rmap.h | 1 + mm/rmap.c | 28 +++++++++++++- mm/vmscan.c | 3 ++ 10 files changed, 214 insertions(+), 3 deletions(-) -- 1.7.9.5 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>