This patch series enhances the existing virtio-balloon with the following new features: 1) fast ballooning: transfer ballooned pages between the guest and host in chunks using sgs, instead of one by one; and 2) cmdq: a new virtqueue to send commands between the device and driver. Currently, it supports commands to report memory stats (replace the old statq mechanism) and report guest unused pages. Change Log: v11->v12: 1) xbitmap: use the xbitmap from Matthew Wilcox to record ballooned pages. 2) virtio-ring: enable the driver to build up a desc chain using vring desc. 3) virtio-ring: Add locking to the existing START_USE() and END_USE() macro to lock/unlock the vq when a vq operation starts/ends. 4) virtio-ring: add virtqueue_kick_sync() and virtqueue_kick_async() 5) virtio-balloon: describe chunks of ballooned pages and free pages blocks directly using one or more chains of desc from the vq. v10->v11: 1) virtio_balloon: use vring_desc to describe a chunk; 2) virtio_ring: support to add an indirect desc table to virtqueue; 3) virtio_balloon: use cmdq to report guest memory statistics. v9->v10: 1) mm: put report_unused_page_block() under CONFIG_VIRTIO_BALLOON; 2) virtio-balloon: add virtballoon_validate(); 3) virtio-balloon: msg format change; 4) virtio-balloon: move miscq handling to a task on system_freezable_wq; 5) virtio-balloon: code cleanup. v8->v9: 1) Split the two new features, VIRTIO_BALLOON_F_BALLOON_CHUNKS and VIRTIO_BALLOON_F_MISC_VQ, which were mixed together in the previous implementation; 2) Simpler function to get the free page block. v7->v8: 1) Use only one chunk format, instead of two. 2) re-write the virtio-balloon implementation patch. 3) commit changes 4) patch re-org Liang Li (1): virtio-balloon: deflate via a page list Matthew Wilcox (1): Introduce xbitmap Wei Wang (6): virtio-balloon: coding format cleanup xbitmap: add xb_find_next_bit() and xb_zero() virtio-balloon: VIRTIO_BALLOON_F_SG mm: support reporting free page blocks mm: export symbol of next_zone and first_online_pgdat virtio-balloon: VIRTIO_BALLOON_F_CMD_VQ drivers/virtio/virtio_balloon.c | 414 ++++++++++++++++++++++++++++++++---- drivers/virtio/virtio_ring.c | 224 +++++++++++++++++-- include/linux/mm.h | 5 + include/linux/radix-tree.h | 2 + include/linux/virtio.h | 22 ++ include/linux/xbitmap.h | 53 +++++ include/uapi/linux/virtio_balloon.h | 11 + lib/radix-tree.c | 164 +++++++++++++- mm/mmzone.c | 2 + mm/page_alloc.c | 96 +++++++++ 10 files changed, 926 insertions(+), 67 deletions(-) create mode 100644 include/linux/xbitmap.h -- 2.7.4
