On Wed, Jun 29, 2016 at 06:32:13PM +0800, Liang Li wrote: > 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. So I'm fine with this patchset, but I noticed it was not yet reviewed by MM people. And that is not surprising since you did not copy memory management mailing list on it. I added linux-mm@xxxxxxxxx Cc on this mail but this might not be enough. Please repost (e.g. [PATCH v2 repost]) copying the relevant mailing list so we can get some reviews. > > 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 -- 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
