Ping ... Liang
> -----Original Message----- > From: Li, Liang Z > Sent: Wednesday, June 29, 2016 6:32 PM > To: m...@redhat.com > Cc: linux-ker...@vger.kernel.org; virtualizat...@lists.linux-foundation.org; > k...@vger.kernel.org; qemu-devel@nongnu.org; virtio-dev@lists.oasis- > open.org; dgilb...@redhat.com; quint...@redhat.com; Li, Liang Z > Subject: [PATCH v2 kernel 0/7] Extend virtio-balloon for fast (de)inflating & > fast live migration > > This patch set contains two parts of changes to the virtio-balloon. > > One is the change for speeding up the inflating & deflating process, the main > idea of this optimization is to use bitmap to send the page information to > host instead of the PFNs, to reduce the overhead of virtio data transmission, > address translation and madvise(). This can help to improve the performance > by about 85%. > > Another change is for speeding up live migration. By skipping process guest's > free pages in the first round of data copy, to reduce needless data > processing, > this can help to save quite a lot of CPU cycles and network bandwidth. We > put guest's free page information in bitmap and send it to host with the virt > queue of virtio-balloon. For an idle 8GB guest, this can help to shorten the > total live migration time from 2Sec to about 500ms in the 10Gbps network > environment. > > > Changes from v1 to v2: > * Abandon the patch for dropping page cache. > * Put some structures to uapi head file. > * Use a new way to determine the page bitmap size. > * Use a unified way to send the free page information with the bitmap > * Address the issues referred in MST's comments > > Liang Li (7): > virtio-balloon: rework deflate to add page to a list > virtio-balloon: define new feature bit and page bitmap head > mm: add a function to get the max pfn > virtio-balloon: speed up inflate/deflate process > virtio-balloon: define feature bit and head for misc virt queue > mm: add the related functions to get free page info > virtio-balloon: tell host vm's free page info > > drivers/virtio/virtio_balloon.c | 306 > +++++++++++++++++++++++++++++++----- > include/uapi/linux/virtio_balloon.h | 41 +++++ > mm/page_alloc.c | 52 ++++++ > 3 files changed, 359 insertions(+), 40 deletions(-) > > -- > 1.8.3.1
