From: Prasad Pandit <p...@fedoraproject.org> Hello,
* Currently Multifd and Postcopy migration can not be used together. QEMU shows "Postcopy is not yet compatible with multifd" message. When migrating guests with large (100's GB) RAM, Multifd threads help to accelerate migration, but inability to use it with the Postcopy mode delays guest start up on the destination side. * This patch series allows to enable both Multifd and Postcopy migration together. Precopy and Multifd threads work during the initial guest (RAM) transfer. When migration moves to the Postcopy phase, Multifd threads are restrained and the Postcopy threads start to request pages from the source side. * This series removes magic value (4-bytes) introduced in the previous series for the Postcopy channel. And refactoring of the 'ram_save_target_page' function is made independent of the multifd & postcopy change. v1: https://lore.kernel.org/qemu-devel/20241126115748.118683-1-ppan...@redhat.com/T/#u v0: https://lore.kernel.org/qemu-devel/20241029150908.1136894-1-ppan...@redhat.com/T/#u Thank you. --- Prasad Pandit (3): migration/multifd: move macros to multifd header migration: refactor ram_save_target_page functions migration: enable multifd and postcopy together migration/migration.c | 90 +++++++++++++++++++++++--------------- migration/multifd-nocomp.c | 3 +- migration/multifd.c | 5 --- migration/multifd.h | 5 +++ migration/options.c | 5 --- migration/ram.c | 73 +++++++++---------------------- 6 files changed, 82 insertions(+), 99 deletions(-) -- 2.47.1
