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migration: discard non-dirty ram pages after the start of postcopy

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After the start of postcopy migration there are some non-dirty pages which have
already been migrated. These pages are no longer needed on the source vm so that
we can free them and it doen't hurt to complete the migration.

Signed-off-by: Pavel Butsykin <pbutsykin@virtuozzo.com>
Message-Id: <20170203152321.19739-4-pbutsykin@virtuozzo.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Pavel Butsykin
2017-02-03 18:23:21 +03:00
committed by Dr. David Alan Gilbert
parent 53f09a1076
commit ced1c6166e
3 changed files with 24 additions and 0 deletions
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4
migration/migration.c
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@@ -1722,6 +1722,10 @@ static int postcopy_start(MigrationState *ms, bool *old_vm_running)
*/
qemu_savevm_send_ping(ms->to_dst_file, 4);
if (migrate_release_ram()) {
ram_postcopy_migrated_memory_release(ms);
}
ret = qemu_file_get_error(ms->to_dst_file);
if (ret) {
error_report("postcopy_start: Migration stream errored");