[Qemu-devel] [RFC v2] Migration thread

[Juan Quintela <quintela@redhat.com>]

Hi

here is v2 of the migration thread series.  There is still some "issues"
with locking in the error paths (they are at 54 patches now).

Changes from v1:
- migration stats series are included
- migration bitmap sync trace-events to know how long it takes
- file->last_error use almost removed
  reworked functions to return real error codes and work with that.
  Some more work needed here.
- new savevm for live migration pending method.  see last commit for
details.

Please test and comment.

Later, Juan.

The following changes since commit 6e4c0d1f03d6ab407509c32fab7cb4b8230f57ff:

  hw/pl110: Fix spelling of 'palette' (2012-09-06 17:04:33 +0200)

are available in the git repository at:

  http://repo.or.cz/r/qemu/quintela.git migration-thread-v2

for you to fetch changes up to 688feac0fbc287920dff537ed13fb8483c064f7f:

  savem: Add calculating a new save_live migration method: pending (2012-09-07 14:00:35 +0200)

----------------------------------------------------------------
Juan Quintela (49):
      buffered_file: g_realloc() can't fail
      fix migration sync
      migration: store end_time in a local variable
      migration: print total downtime for final phase of migration
      migration: rename expected_time to expected_downtime
      migration: export migrate_get_current()
      migration: print expected downtime in info migrate
      savevm: Factorize ram globals reset in its own function
      ram: introduce migration_bitmap_set_dirty()
      ram: Introduce migration_bitmap_test_and_reset_dirty()
      ram: Export last_ram_offset()
      ram: introduce migration_bitmap_sync()
      ram: create trace event for migration sync bitmap
      Separate migration bitmap
      migration: Add dirty_pages_rate to query migrate output
      buffered_file: rename opaque to migration_state
      buffered_file: opaque is MigrationState
      buffered_file: unfold migrate_fd_put_buffer
      buffered_file: unfold migrate_fd_put_ready
      buffered_file: unfold migrate_fd_put_buffer
      buffered_file: unfold migrate_fd_put_buffer
      buffered_file: We can access directly to bandwidth_limit
      buffered_file: callers of buffered_flush() already check for errors
      buffered_file: make buffered_flush return the error code
      migration: make migrate_fd_wait_for_unfreeze() return errors
      savevm: unexport qemu_fflush
      viritio-net: use qemu_get_buffer() in a temp buffer
      savevm: Remove qemu_fseek()
      savevm: make qemu_fflush() return an error code
      savevm: unfold qemu_fclose_internal()
      savevm: unexport qemu_ftell()
      savevm: make qemu_fill_buffer() be consistent
      savevm: Only qemu_fflush() can generate errors
      buffered_file: buffered_put_buffer() don't need to set last_error
      block-migration: make flush_blks() return errors
      block-migration:  Switch meaning of return value
      block-migration: handle errors with the return codes correctly
      savevm: un-export qemu_file_set_error()
      savevm: make qemu_file_put_notify() return errors
      buffered_file: Move from using a timer to use a thread
      migration: make qemu_fopen_ops_buffered() return void
      migration: stop all cpus correctly
      migration: make writes blocking
      migration: remove unfreeze logic
      migration: take finer locking
      buffered_file: Unfold the trick to restart generating migration data
      buffered_file: don't flush on put buffer
      buffered_file: unfold buffered_append in buffered_put_buffer
      savem: Add calculating a new save_live migration method: pending

Paolo Bonzini (2):
      split MRU ram list
      BufferedFile: append, then flush

Umesh Deshpande (2):
      add a version number to ram_list
      protect the ramlist with a separate mutex

 arch_init.c       | 174 ++++++++++++++++++++++++++++++++------------
 block-migration.c | 100 +++++++++----------------
 buffered_file.c   | 213 +++++++++++++++++++++---------------------------------
 buffered_file.h   |  12 +--
 cpu-all.h         |  17 ++++-
 exec-obsolete.h   |  10 ---
 exec.c            |  45 ++++++++++--
 hmp.c             |  12 +++
 hw/virtio-net.c   |   4 +-
 migration-exec.c  |   2 -
 migration-fd.c    |   6 --
 migration-tcp.c   |   2 +-
 migration-unix.c  |   2 -
 migration.c       | 151 +++++++++++++++++++-------------------
 migration.h       |  10 +++
 qapi-schema.json  |  18 ++++-
 qemu-file.h       |  11 ---
 qmp-commands.hx   |   9 +++
 savevm.c          | 144 ++++++++++++++++++------------------
 sysemu.h          |   1 +
 trace-events      |   4 +
 vmstate.h         |   1 +
 22 files changed, 498 insertions(+), 450 deletions(-)