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[v1,0/4] Allow to enable multifd and postcopy migration together

Message ID 20241126115748.118683-1-ppandit@redhat.com (mailing list archive)
Headers show
Series Allow to enable multifd and postcopy migration together | expand

Message

Prasad Pandit Nov. 26, 2024, 11:57 a.m. UTC 
From: Prasad Pandit <pjp@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.

  v0 -> https://lore.kernel.org/qemu-devel/20241029150908.1136894-1-ppandit@redhat.com/T/#u

Thank you.
---
Prasad Pandit (4):
  migration/multifd: move macros to multifd header
  migration: remove multifd check with postcopy
  migration: refactor ram_save_target_page functions
  migration: enable multifd and postcopy together

 migration/migration.c      | 95 ++++++++++++++++++++++++--------------
 migration/multifd-nocomp.c |  3 +-
 migration/multifd.c        |  5 --
 migration/multifd.h        |  5 ++
 migration/options.c        |  5 --
 migration/ram.c            | 74 +++++++++--------------------
 6 files changed, 89 insertions(+), 98 deletions(-)