This series provides an asynchronous means of reporting free guest pages to QEMU through virtio-balloon so that the memory associated with those pages can be dropped and reused by other processes and/or guests on the host. Using this it is possible to avoid unnecessary I/O to disk and greatly improve performance in the case of memory overcommit on the host.
I originally submitted this patch series[1] back on February 11th 2020, but at that time I was focused primarily on the kernel portion of this patch set. However as of April 7th those patches are now included in Linus's kernel tree[2] and so I thought I should resubmit the QEMU side of this for inclusion so that the feature will be available in QEMU hopefully by the time the 5.7 kernel tree is released. [1]: https://lore.kernel.org/lkml/20200211224416.29318.44077.stgit@localhost.localdomain/ [2]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b0c504f154718904ae49349147e3b7e6ae91ffdc Changes from v17: Fixed typo in patch 1 title Addressed white-space issues reported via checkpatch Added braces {} for two if statements to match expected coding style --- Alexander Duyck (3): virtio-balloon: Implement support for page poison tracking feature virtio-balloon: Add support for providing free page reports to host virtio-balloon: Provide a interface for free page reporting hw/virtio/virtio-balloon.c | 70 ++++++++++++++++++++++- include/hw/virtio/virtio-balloon.h | 3 + include/standard-headers/linux/virtio_balloon.h | 1 3 files changed, 69 insertions(+), 5 deletions(-) --
