Hi Michael, I know you are very busy. If you have time, could you help to take a look at this patch set?
Thanks! Liang > -----Original Message----- > From: Li, Liang Z > Sent: Thursday, August 18, 2016 9:06 AM > To: Michael S. Tsirkin > Cc: virtualizat...@lists.linux-foundation.org; linux...@kvack.org; virtio- > d...@lists.oasis-open.org; k...@vger.kernel.org; qemu-devel@nongnu.org; > quint...@redhat.com; dgilb...@redhat.com; Hansen, Dave; linux- > ker...@vger.kernel.org > Subject: RE: [PATCH v3 kernel 0/7] Extend virtio-balloon for fast > (de)inflating > & fast live migration > > 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-ker...@vger.kernel.org > > Cc: virtualizat...@lists.linux-foundation.org; linux...@kvack.org; > > virtio- d...@lists.oasis-open.org; k...@vger.kernel.org; > > qemu-devel@nongnu.org; quint...@redhat.com; dgilb...@redhat.com; > > 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
