Hi Michael, Could you help to review this version when you have time? Thanks! Liang > -----Original Message----- > From: Li, Liang Z > Sent: Monday, August 08, 2016 2:35 PM > To: linux-kernel@xxxxxxxxxxxxxxx > Cc: virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx; linux-mm@xxxxxxxxx; virtio- > dev@xxxxxxxxxxxxxxxxxxxx; kvm@xxxxxxxxxxxxxxx; qemu-devel@xxxxxxxxxx; > quintela@xxxxxxxxxx; dgilbert@xxxxxxxxxx; Hansen, Dave; Li, Liang Z > Subject: [PATCH v3 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. > > Dave Hansen suggested a new scheme to encode the data structure, > because of additional complexity, it's not implemented in v3. > > Changes from v2 to v3: > * Change the name of 'free page' to 'unused page'. > * Use the scatter & gather bitmap instead of a 1MB page bitmap. > * Fix overwriting the page bitmap after kicking. > * Some of MST's comments for v2. > > 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 > mm: add the related functions to get unused page > virtio-balloon: define feature bit and head for misc virt queue > virtio-balloon: tell host vm's unused page info > > drivers/virtio/virtio_balloon.c | 390 > ++++++++++++++++++++++++++++++++---- > include/linux/mm.h | 3 + > include/uapi/linux/virtio_balloon.h | 41 ++++ > mm/page_alloc.c | 94 +++++++++ > 4 files changed, 485 insertions(+), 43 deletions(-) > > -- > 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
