Re: [libvirt PATCH 5/6] qemu: Enable postcopy-preempt migration capability

During post-copy migration (once it actually switches to post-copy mode) dirty memory pages are continued to be migrated iteratively, while the destination can explicitly request a specific page to be migrated before the iterative process gets to it (which happens when a guest wants to read a page that was not migrated yet). Without the postcopy-preempt capability enabled such pages need to wait until all other pages already queued are transferred. Enabling this capability will instruct the hypervisor to create a separate migration channel for explicitly requested pages so that they can preempt the queue.

This is enabled for all post-copy migration as long as the capability is supported on both sides of migration. Signed-off-by: Jiri Denemark <jdenemar(a)redhat.com&gt; --- src/qemu/qemu_migration.c | 11 +++++++---- src/qemu/qemu_migration_params.c | 2 ++ src/qemu/qemu_migration_params.h | 1 + 3 files changed, 10 insertions(+), 4 deletions(-)