* Pavel Butsykin (pbutsy...@virtuozzo.com) wrote: > On 07.03.2017 16:56, Dr. David Alan Gilbert wrote: > > * Pavel Butsykin (pbutsy...@virtuozzo.com) wrote: > > > On 14.02.2017 17:02, Dr. David Alan Gilbert wrote: > > > > Hi Pavel, > > > > I was curious, having merged this, how you're using postcopy; do > > > > you switch > > > > into postcopy mode immediately or wait until the first sync or what? > > > > Do you find yourself in postcopy mode long enough that it's worth > > > > doing the release? If so on what size VMs are you working with? > > > > > > > > Dave > > > > > > Hi Dave, > > > I'm sorry it took so long, I was on vacation. And thanks for the quick > > > review and merge! > > > > > > We want to use this function to update Qemu without rebooting VMs. It > > > looks like a local migration on the same host. Now, switching into > > > postcopy mode is done immediately, the size of VMs can be very > > > different. > > > > Thanks! Do you have libvirt magic to do that update? > > Yes, there are patches that add a flag "--local" for migration. The > flag adds start incoming VM and other magic about replacement source on > destination.
Nice; are those posted to libvirt's list somewhere? Dave > > Dave > > > > > > * Pavel Butsykin (pbutsy...@virtuozzo.com) wrote: > > > > > This feature frees the migrated memory on the source during > > > > > postcopy-ram > > > > > migration. In the second step of postcopy-ram migration when the > > > > > source vm > > > > > is put on pause we can free unnecessary memory. It will allow, in > > > > > particular, > > > > > to start relaxing the memory stress on the source host in a > > > > > load-balancing > > > > > scenario. > > > > > > > > > > Changes from v1: > > > > > - changed name of the interfaces (discard to release) > > > > > - fix make check error > > > > > - add more comments to qemu_iovec_release_ram() > > > > > - rebase on "Postcopy: Hugepage support" (David's patch series) > > > > > - removed ram_discard_page for xbzrle > > > > > - fix erroneous release memory in complete precopy (tie release-ram > > > > > to postcopy) > > > > > > > > > > Pavel Butsykin (3): > > > > > migration: add MigrationState arg for ram_save_/compressed_/page() > > > > > add 'release-ram' migrate capability > > > > > migration: discard non-dirty ram pages after the start of postcopy > > > > > > > > > > include/migration/migration.h | 2 ++ > > > > > include/migration/qemu-file.h | 3 ++- > > > > > migration/migration.c | 13 ++++++++++ > > > > > migration/qemu-file.c | 59 > > > > > ++++++++++++++++++++++++++++++++++++++----- > > > > > migration/ram.c | 56 > > > > > ++++++++++++++++++++++++++++++++++------ > > > > > qapi-schema.json | 5 +++- > > > > > 6 files changed, 121 insertions(+), 17 deletions(-) > > > > > > > > > > -- > > > > > 2.11.0 > > > > > > > > > > > > > > -- > > > > Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK > > > > > > -- > > Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK > > -- Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
