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migration: do not transfer ram during bulk storage migration 

this patch makes the bulk phase of a block migration to take
place before we start transferring ram. As the bulk block migration
can take a long time its pointless to transfer ram during that phase.

Signed-off-by: Peter Lieven <pl@kamp.de>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <1520507908-16743-2-git-send-email-pl@kamp.de>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Peter Lieven 2018-03-08 12:18:24 +01:00 committed by Dr. David Alan Gilbert
parent ab105cc138
commit b255734531
1 changed files with 8 additions and 0 deletions
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8
migration/ram.c
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@ -2258,6 +2258,13 @@ static int ram_save_iterate(QEMUFile *f, void *opaque)
int64_t t0;
int done = 0;
if (blk_mig_bulk_active()) {
/* Avoid transferring ram during bulk phase of block migration as
* the bulk phase will usually take a long time and transferring
* ram updates during that time is pointless. */
goto out;
}
rcu_read_lock();
if (ram_list.version != rs->last_version) {
ram_state_reset(rs);
@ -2304,6 +2311,7 @@ static int ram_save_iterate(QEMUFile *f, void *opaque)
*/
ram_control_after_iterate(f, RAM_CONTROL_ROUND);
out:
qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
ram_counters.transferred += 8;