Commit 4addcd4f authored by Dr. David Alan Gilbert's avatar Dr. David Alan Gilbert Committed by Amit Shah
Browse files

Migration: Emit event at start of pass 



Emit an event each time we sync the dirty bitmap on the source;
this helps libvirt use postcopy by giving it a kick when it
might be a good idea to start the postcopy.

Signed-off-by: default avatarDr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: default avatarJuan Quintela <quintela@redhat.com>
Reviewed-by: default avatarEric Blake <eblake@redhat.com>
Reviewed-by: default avatarAmit Shah <amit.shah@redhat.com>
Message-Id: <1450266458-3178-5-git-send-email-dgilbert@redhat.com>
Signed-off-by: default avatarAmit Shah <amit.shah@redhat.com>
parent 6ba996bb

docs/qmp-events.txt

+14 −0
Original line number Diff line number Diff line
@@ -496,6 +496,20 @@ Example: 
{"timestamp": {"seconds": 1432121972, "microseconds": 744001},

 "event": "MIGRATION", "data": {"status": "completed"}}



MIGRATION_PASS

--------------



Emitted from the source side of a migration at the start of each pass

(when it syncs the dirty bitmap)



Data: None.



  - "pass": An incrementing count (starting at 1 on the first pass)



Example:

{"timestamp": {"seconds": 1449669631, "microseconds": 239225},

 "event": "MIGRATION_PASS", "data": {"pass": 2}}



STOP

----

migration/ram.c

+4 −0
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ 
 */

#include <stdint.h>

#include <zlib.h>

#include "qapi-event.h"

#include "qemu/bitops.h"

#include "qemu/bitmap.h"

#include "qemu/timer.h"
@@ -682,6 +683,9 @@ static void migration_bitmap_sync(void) 
        num_dirty_pages_period = 0;

    }

    s->dirty_sync_count = bitmap_sync_count;

    if (migrate_use_events()) {

        qapi_event_send_migration_pass(bitmap_sync_count, NULL);

    }

}



/**

qapi/event.json

+13 −0
Original line number Diff line number Diff line
@@ -254,6 +254,19 @@ 
{ 'event': 'MIGRATION',

  'data': {'status': 'MigrationStatus'}}



##

# @MIGRATION_PASS

#

# Emitted from the source side of a migration at the start of each pass

# (when it syncs the dirty bitmap)

#

# @pass: An incrementing count (starting at 1 on the first pass)

#

# Since: 2.6

##

{ 'event': 'MIGRATION_PASS',

  'data': { 'pass': 'int' } }



##

# @ACPI_DEVICE_OST

#