Hello, where i can found the patch in git.kernel.org ? Am Samstag, den 30.09.2017, 12:05 +0800 schrieb Wei Wang: > 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 array each time; and > 2) free page block reporting: a new virtqueue to report guest free > pages > to the host. > > The second feature can be used to accelerate live migration of VMs. > Here > are some details: > > Live migration needs to transfer the VM's memory from the source > machine > to the destination round by round. For the 1st round, all the VM's > memory > is transferred. From the 2nd round, only the pieces of memory that > were > written by the guest (after the 1st round) are transferred. One > method > that is popularly used by the hypervisor to track which part of > memory is > written is to write-protect all the guest memory. > > The second feature enables the optimization of the 1st round memory > transfer - the hypervisor can skip the transfer of guest free pages > in the > 1st round. It is not concerned that the memory pages are used after > they > are given to the hypervisor as a hint of the free pages, because they > will > be tracked by the hypervisor and transferred in the next round if > they are > used and written. > > Change Log: > v15->v16: > 1) mm: stop reporting the free pfn range if the callback returns > false; > 2) mm: move some implementaion of walk_free_mem_block into a function > to > make the code layout looks better; > 3) xbitmap: added some optimizations suggested by Matthew, please > refer to > the ChangLog in the xbitmap patch for details. > 4) xbitmap: added a test suite > 5) virtio-balloon: bail out with a warning when virtqueue_add_inbuf > returns > an error > 6) virtio-balloon: some small code re-arrangement, e.g. detachinf > used buf > from the vq before adding a new buf > > v14->v15: > 1) mm: make the report callback return a bool value - returning 1 to > stop > walking through the free page list. > 2) virtio-balloon: batching sgs of balloon pages till the vq is full > 3) virtio-balloon: create a new workqueue, rather than using the > default > system_wq, to queue the free page reporting work item. > 4) virtio-balloon: add a ctrl_vq to be a central control plane which > will > handle all the future control related commands between the host and > guest. > Add free page report as the first feature controlled under ctrl_vq, > and > the free_page_vq is a data plane vq dedicated to the transmission of > free > page blocks. > > v13->v14: > 1) xbitmap: move the code from lib/radix-tree.c to lib/xbitmap.c. > 2) xbitmap: consolidate the implementation of xb_bit_set/clear/test > into > one xb_bit_ops. > 3) xbitmap: add documents for the exported APIs. > 4) mm: rewrite the function to walk through free page blocks. > 5) virtio-balloon: when reporting a free page blcok to the device, if > the > vq is full (less likey to happen in practice), just skip reporting > this > block, instead of busywaiting till an entry gets released. > 6) virtio-balloon: fail the probe function if adding the signal buf > in > init_vqs fails. > > v12->v13: > 1) mm: use a callback function to handle the the free page blocks > from the > report function. This avoids exposing the zone internal to a kernel > module. > 2) virtio-balloon: send balloon pages or a free page block using a > single > sg each time. This has the benefits of simpler implementation with no > new > APIs. > 3) virtio-balloon: the free_page_vq is used to report free pages only > (no > multiple usages interleaving) > 4) virtio-balloon: Balloon pages and free page blocks are sent via > input > sgs, and the completion signal to the host is sent via an output sg. > > 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 > > Matthew Wilcox (2): > lib/xbitmap: Introduce xbitmap > radix tree test suite: add tests for xbitmap > > Wei Wang (3): > virtio-balloon: VIRTIO_BALLOON_F_SG > mm: support reporting free page blocks > virtio-balloon: VIRTIO_BALLOON_F_CTRL_VQ > > drivers/virtio/virtio_balloon.c | 437 > +++++++++++++++++++++++++++++--- > include/linux/mm.h | 6 + > include/linux/radix-tree.h | 2 + > include/linux/xbitmap.h | 66 +++++ > include/uapi/linux/virtio_balloon.h | 16 ++ > lib/Makefile | 2 +- > lib/radix-tree.c | 42 ++- > lib/xbitmap.c | 264 +++++++++++++++++++ > mm/page_alloc.c | 91 +++++++ > tools/include/linux/bitmap.h | 34 +++ > tools/include/linux/kernel.h | 2 + > tools/testing/radix-tree/Makefile | 7 +- > tools/testing/radix-tree/linux/kernel.h | 2 - > tools/testing/radix-tree/main.c | 5 + > tools/testing/radix-tree/test.h | 1 + > tools/testing/radix-tree/xbitmap.c | 269 ++++++++++++++++++++ > 16 files changed, 1203 insertions(+), 43 deletions(-) > create mode 100644 include/linux/xbitmap.h > create mode 100644 lib/xbitmap.c > create mode 100644 tools/testing/radix-tree/xbitmap.c >
