qemu/include/migration
Wei Wang 6eeb63f740 migration/ram.c: add the free page optimization enable flag
This patch adds the free page optimization enable flag, and a function
to set this flag. When the free page optimization is enabled, not all
the pages are needed to be sent in the bulk stage.

Why using a new flag, instead of directly disabling ram_bulk_stage when
the optimization is running?
Thanks for Peter Xu's reminder that disabling ram_bulk_stage will affect
the use of compression. Please see save_page_use_compression. When
xbzrle and compression are used, if free page optimizaion causes the
ram_bulk_stage to be disabled, save_page_use_compression will return
false, which disables the use of compression. That is, if free page
optimization avoids the sending of half of the guest pages, the other
half of pages loses the benefits of compression in the meantime. Using a
new flag to let migration_bitmap_find_dirty skip the free pages in the
bulk stage will avoid the above issue.

Signed-off-by: Wei Wang <wei.w.wang@intel.com>
CC: Dr. David Alan Gilbert <dgilbert@redhat.com>
CC: Juan Quintela <quintela@redhat.com>
CC: Michael S. Tsirkin <mst@redhat.com>
CC: Peter Xu <peterx@redhat.com>
Message-Id: <1544516693-5395-7-git-send-email-wei.w.wang@intel.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2019-03-06 10:49:18 +00:00
..
blocker.h migration: Create migration/blocker.h 2017-05-17 12:04:59 +02:00
colo.h COLO: Remove colo_state migration struct 2018-10-19 11:15:03 +08:00
cpu.h migration: Add VMSTATE_UINTTL_2DARRAY() 2017-05-04 09:39:01 +09:00
failover.h Include less of the generated modular QAPI headers 2018-03-02 13:45:50 -06:00
global_state.h Include less of the generated modular QAPI headers 2018-03-02 13:45:50 -06:00
misc.h migration/ram.c: add the free page optimization enable flag 2019-03-06 10:49:18 +00:00
qemu-file-types.h migration: Split qemu-file.h 2017-06-01 18:49:22 +02:00
register.h vmstate: constify SaveVMHandlers 2019-01-23 15:51:47 +00:00
snapshot.h migration: Create include for migration snapshots 2017-06-01 18:49:23 +02:00
vmstate.h migration: Add a VMSTATE_BOOL_TEST() macro 2019-02-27 21:06:08 -06:00