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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: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Amit Shah <amit.shah@redhat.com> Message-Id: <1450266458-3178-5-git-send-email-dgilbert@redhat.com> Signed-off-by: Amit Shah <amit.shah@redhat.com>
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@ -496,6 +496,20 @@ Example:
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{"timestamp": {"seconds": 1432121972, "microseconds": 744001},
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"event": "MIGRATION", "data": {"status": "completed"}}
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MIGRATION_PASS
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--------------
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Emitted from the source side of a migration at the start of each pass
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(when it syncs the dirty bitmap)
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Data: None.
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- "pass": An incrementing count (starting at 1 on the first pass)
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Example:
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{"timestamp": {"seconds": 1449669631, "microseconds": 239225},
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"event": "MIGRATION_PASS", "data": {"pass": 2}}
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STOP
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----
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@ -27,6 +27,7 @@
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*/
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#include <stdint.h>
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#include <zlib.h>
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#include "qapi-event.h"
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#include "qemu/bitops.h"
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#include "qemu/bitmap.h"
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#include "qemu/timer.h"
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@ -682,6 +683,9 @@ static void migration_bitmap_sync(void)
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num_dirty_pages_period = 0;
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}
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s->dirty_sync_count = bitmap_sync_count;
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if (migrate_use_events()) {
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qapi_event_send_migration_pass(bitmap_sync_count, NULL);
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}
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}
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/**
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@ -254,6 +254,19 @@
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{ 'event': 'MIGRATION',
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'data': {'status': 'MigrationStatus'}}
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##
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# @MIGRATION_PASS
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#
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# Emitted from the source side of a migration at the start of each pass
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# (when it syncs the dirty bitmap)
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#
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# @pass: An incrementing count (starting at 1 on the first pass)
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#
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# Since: 2.6
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##
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{ 'event': 'MIGRATION_PASS',
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'data': { 'pass': 'int' } }
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##
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# @ACPI_DEVICE_OST
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#
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