Add a new field, VIRTIO_BALLOON_S_AVAIL, to virtio_balloon memory statistics protocol, corresponding to 'Available' in /proc/meminfo.
It indicates to the hypervisor how big the balloon can be inflated without pushing the guest system to swap. This metric would be very useful in VM orchestration software to improve memory management of different VMs under overcommit. Signed-off-by: Igor Redko <red...@virtuozzo.com> Reviewed-by: Roman Kagan <rka...@virtuozzo.com> Signed-off-by: Denis V. Lunev <d...@openvz.org> CC: Michael S. Tsirkin <m...@redhat.com> CC: Andrew Morton <a...@linux-foundation.org> Igor Redko (2): calculate 'available' memory in the separate function virtio_balloon: export 'available' memory to balloon statistics drivers/virtio/virtio_balloon.c | 6 ++++++ fs/proc/meminfo.c | 31 +------------------------- include/linux/mm.h | 1 + include/uapi/linux/virtio_balloon.h | 3 ++- mm/page_alloc.c | 43 +++++++++++++++++++++++++++++++++++++ 5 files changed, 53 insertions(+), 31 deletions(-) -- 2.5.0
