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migration/postcopy: Update the bandwidth during postcopy 

The recently added max-postcopy-bandwidth parameter is only read
at the transition from precopy->postcopy where as the older
max-bandwidth parameter updates the migration bandwidth when changed
even if the migration is already running.

Fix this discrepency so that:
  a) You can change the bandwidth during postcopy by setting
     max-postcopy-bandwidth

  b) Changing max-bandwidth during postcopy has no effect
     (it currently changes the postcopy bandwidth which isn't
     expected).

Fixes: 7e555c6c
bz: https://bugzilla.redhat.com/show_bug.cgi?id=1686321
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2019-03-08 10:12:10 +00:00 committed by Juan Quintela
parent 5ed0deca41
commit c38c1c142e
1 changed files with 5 additions and 1 deletions
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6
migration/migration.c
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@ -1341,7 +1341,7 @@ static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
if (params->has_max_bandwidth) {
s->parameters.max_bandwidth = params->max_bandwidth;
if (s->to_dst_file) {
if (s->to_dst_file && !migration_in_postcopy()) {
qemu_file_set_rate_limit(s->to_dst_file,
s->parameters.max_bandwidth / XFER_LIMIT_RATIO);
}
@ -1370,6 +1370,10 @@ static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
}
if (params->has_max_postcopy_bandwidth) {
s->parameters.max_postcopy_bandwidth = params->max_postcopy_bandwidth;
if (s->to_dst_file && migration_in_postcopy()) {
qemu_file_set_rate_limit(s->to_dst_file,
s->parameters.max_postcopy_bandwidth / XFER_LIMIT_RATIO);
}
}
if (params->has_max_cpu_throttle) {
s->parameters.max_cpu_throttle = params->max_cpu_throttle;