Ping ... Liang > -----Original Message----- > From: kvm-owner@xxxxxxxxxxxxxxx [mailto:kvm-owner@xxxxxxxxxxxxxxx] > On Behalf Of Liang Li > Sent: Friday, July 15, 2016 10:47 AM > To: qemu-devel@xxxxxxxxxx > Cc: mst@xxxxxxxxxx; pbonzini@xxxxxxxxxx; quintela@xxxxxxxxxx; > amit.shah@xxxxxxxxxx; kvm@xxxxxxxxxxxxxxx; dgilbert@xxxxxxxxxx; > thuth@xxxxxxxxxx; Li, Liang Z > Subject: [QEMU v2 0/9] Fast (de)inflating & fast live migration > > This patch set intends to do two optimizations, one is to speed up the > (de)inflating process of virtio balloon, and another one which is to speed up > the live migration process. We put them together because both of them are > required to change the virtio balloon spec. > > The main idea of speeding up the (de)inflating process 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%. > > The idea of speeding up live migration is to skip 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 get guest's > free page information through the virt queue of virtio-balloon, and filter out > these free pages during live migration. 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. > * Get a struct from vq instead of separate variables. > * Use two separate APIs to request free pages and query the status. > * Changed the virtio balloon interface. > * Addressed some of the comments of v1. > > Liang Li (9): > virtio-balloon: Remove needless precompiled directive > virtio-balloon: update linux head file > virtio-balloon: speed up inflating & deflating process > virtio-balloon: update linux head file for new feature > balloon: get free page info from guest > balloon: migrate vq elem to destination > bitmap: Add a new bitmap_move function > kvm: Add two new arch specific functions > migration: skip free pages during live migration > > balloon.c | 47 +++- > hw/virtio/virtio-balloon.c | 304 ++++++++++++++++++++++-- > include/hw/virtio/virtio-balloon.h | 18 +- > include/qemu/bitmap.h | 13 + > include/standard-headers/linux/virtio_balloon.h | 41 ++++ > include/sysemu/balloon.h | 18 +- > include/sysemu/kvm.h | 18 ++ > migration/ram.c | 86 +++++++ > target-arm/kvm.c | 14 ++ > target-i386/kvm.c | 37 +++ > target-mips/kvm.c | 14 ++ > target-ppc/kvm.c | 14 ++ > target-s390x/kvm.c | 14 ++ > 13 files changed, 608 insertions(+), 30 deletions(-) > > -- > 1.9.1 > > -- > 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 -- 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
