[PATCH v5 0/8] Eliminate multifd flush

[Juan Quintela <quintela@redhat.com>]

Hi

In this v5:
- Remove RAM Flags documentation (already on PULL request)
- rebase on top of PULL request.

Please review.

Based-on: <20230213025150.71537-1-quintela@redhat.com>
          Migration 20230213 patches

In this v4:
- Rebased on top of migration-20230209 PULL request
- Integrate two patches in that pull request
- Rebase
- Address Eric reviews.

Please review.

In this v3:
- update to latest upstream.
- fix checkpatch errors.

Please, review.

In this v2:
- update to latest upstream
- change 0, 1, 2 values to defines
- Add documentation for SAVE_VM_FLAGS
- Add missing qemu_fflush(), it made random hangs for migration test
  (only for tls, no clue why).

Please, review.

[v1]
Upstream multifd code synchronize all threads after each RAM section.  This is suboptimal.
Change it to only flush after we go trough all ram.

Preserve all semantics for old machine types.

Juan Quintela (4):
  ram: Document migration ram flags
  multifd: Create property multifd-sync-after-each-section
  multifd: Protect multifd_send_sync_main() calls
  multifd: Only sync once each full round of memory

Leonardo Bras (4):
  migration/multifd: Change multifd_load_cleanup() signature and usage
  migration/multifd: Remove unnecessary assignment on
    multifd_load_cleanup()
  migration/multifd: Join all multifd threads in order to avoid leaks
  migration/multifd: Move load_cleanup inside incoming_state_destroy

 qapi/migration.json   | 10 +++++++-
 migration/migration.h |  1 +
 migration/multifd.h   |  3 ++-
 hw/core/machine.c     |  1 +
 migration/migration.c | 29 ++++++++++++---------
 migration/multifd.c   | 17 +++++++-----
 migration/ram.c       | 60 ++++++++++++++++++++++++++++++++++---------
 7 files changed, 89 insertions(+), 32 deletions(-)

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2.39.1