This series introduces a way to track memory used by balloon drivers. Add a NR_BALLOON_PAGES counter to track how many pages are reclaimed by the balloon drivers. First add the accounting, then updates the balloon drivers (virtio, Hyper-V, VMware, and Xen) to maintain this counter. This makes the information visible in memory reporting interfaces like /proc/meminfo, show_mem, and OOM reporting. This provides admins visibility into their VM balloon sizes without requiring different virtualization tooling. Furthermore, this information is helpful when debugging an OOM inside a VM. Tested: virtio_balloon, run stress-ng, inflate balloon, oom prints Signed-off-by: Nico Pache <npache@xxxxxxxxxx> Nico Pache (5): meminfo: add a per node counter for balloon drivers virtio_balloon: update the NR_BALLOON_PAGES state hv_balloon: update the NR_BALLOON_PAGES state vmx_balloon: update the NR_BALLOON_PAGES state xen: balloon: update the NR_BALLOON_PAGES state drivers/hv/hv_balloon.c | 2 ++ drivers/misc/vmw_balloon.c | 5 ++++- drivers/virtio/virtio_balloon.c | 4 ++++ drivers/xen/balloon.c | 4 ++++ fs/proc/meminfo.c | 2 ++ include/linux/mmzone.h | 1 + mm/memcontrol.c | 1 + mm/show_mem.c | 4 +++- mm/vmstat.c | 1 + 9 files changed, 22 insertions(+), 2 deletions(-) -- 2.48.1
