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migration/postcopy: Add max-postcopy-bandwidth parameter

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Limit the background transfer bandwidth during the postcopy
phase to the value set on this new parameter.  The default, 0,
corresponds to the existing behaviour which is unlimited bandwidth.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20180613102642.23995-2-dgilbert@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2018-06-13 11:26:40 +01:00
parent b734035b61
commit 7e555c6c58
3 changed files with 57 additions and 4 deletions
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7
hmp.c
View File

@ -370,6 +370,9 @@ void hmp_info_migrate_parameters(Monitor *mon, const QDict *qdict)
monitor_printf(mon, "%s: %" PRIu64 "\n",
MigrationParameter_str(MIGRATION_PARAMETER_XBZRLE_CACHE_SIZE),
params->xbzrle_cache_size);
monitor_printf(mon, "%s: %" PRIu64 "\n",
MigrationParameter_str(MIGRATION_PARAMETER_MAX_POSTCOPY_BANDWIDTH),
params->max_postcopy_bandwidth);
}
qapi_free_MigrationParameters(params);
@ -1676,6 +1679,10 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict)
}
p->xbzrle_cache_size = cache_size;
break;
case MIGRATION_PARAMETER_MAX_POSTCOPY_BANDWIDTH:
p->has_max_postcopy_bandwidth = true;
visit_type_size(v, param, &p->max_postcopy_bandwidth, &err);
break;
default:
assert(0);
}

35
migration/migration.c
View File

@ -82,6 +82,11 @@
#define DEFAULT_MIGRATE_MULTIFD_CHANNELS 2
#define DEFAULT_MIGRATE_MULTIFD_PAGE_COUNT 16
/* Background transfer rate for postcopy, 0 means unlimited, note
* that page requests can still exceed this limit.
*/
#define DEFAULT_MIGRATE_MAX_POSTCOPY_BANDWIDTH 0
static NotifierList migration_state_notifiers =
NOTIFIER_LIST_INITIALIZER(migration_state_notifiers);
@ -659,6 +664,8 @@ MigrationParameters *qmp_query_migrate_parameters(Error **errp)
params->x_multifd_page_count = s->parameters.x_multifd_page_count;
params->has_xbzrle_cache_size = true;
params->xbzrle_cache_size = s->parameters.xbzrle_cache_size;
params->has_max_postcopy_bandwidth = true;
params->max_postcopy_bandwidth = s->parameters.max_postcopy_bandwidth;
return params;
}
@ -1066,6 +1073,9 @@ static void migrate_params_test_apply(MigrateSetParameters *params,
if (params->has_xbzrle_cache_size) {
dest->xbzrle_cache_size = params->xbzrle_cache_size;
}
if (params->has_max_postcopy_bandwidth) {
dest->max_postcopy_bandwidth = params->max_postcopy_bandwidth;
}
}
static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
@ -1138,6 +1148,9 @@ static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
s->parameters.xbzrle_cache_size = params->xbzrle_cache_size;
xbzrle_cache_resize(params->xbzrle_cache_size, errp);
}
if (params->has_max_postcopy_bandwidth) {
s->parameters.max_postcopy_bandwidth = params->max_postcopy_bandwidth;
}
}
void qmp_migrate_set_parameters(MigrateSetParameters *params, Error **errp)
@ -1887,6 +1900,16 @@ int64_t migrate_xbzrle_cache_size(void)
return s->parameters.xbzrle_cache_size;
}
static int64_t migrate_max_postcopy_bandwidth(void)
{
MigrationState *s;
s = migrate_get_current();
return s->parameters.max_postcopy_bandwidth;
}
bool migrate_use_block(void)
{
MigrationState *s;
@ -2226,6 +2249,7 @@ static int postcopy_start(MigrationState *ms)
QIOChannelBuffer *bioc;
QEMUFile *fb;
int64_t time_at_stop = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
int64_t bandwidth = migrate_max_postcopy_bandwidth();
bool restart_block = false;
int cur_state = MIGRATION_STATUS_ACTIVE;
if (!migrate_pause_before_switchover()) {
@ -2280,7 +2304,12 @@ static int postcopy_start(MigrationState *ms)
* will notice we're in POSTCOPY_ACTIVE and not actually
* wrap their state up here
*/
qemu_file_set_rate_limit(ms->to_dst_file, INT64_MAX);
/* 0 max-postcopy-bandwidth means unlimited */
if (!bandwidth) {
qemu_file_set_rate_limit(ms->to_dst_file, INT64_MAX);
} else {
qemu_file_set_rate_limit(ms->to_dst_file, bandwidth / XFER_LIMIT_RATIO);
}
if (migrate_postcopy_ram()) {
/* Ping just for debugging, helps line traces up */
qemu_savevm_send_ping(ms->to_dst_file, 2);
@ -3042,6 +3071,9 @@ static Property migration_properties[] = {
DEFINE_PROP_SIZE("xbzrle-cache-size", MigrationState,
parameters.xbzrle_cache_size,
DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE),
DEFINE_PROP_SIZE("max-postcopy-bandwidth", MigrationState,
parameters.max_postcopy_bandwidth,
DEFAULT_MIGRATE_MAX_POSTCOPY_BANDWIDTH),
/* Migration capabilities */
DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE),
@ -3110,6 +3142,7 @@ static void migration_instance_init(Object *obj)
params->has_x_multifd_channels = true;
params->has_x_multifd_page_count = true;
params->has_xbzrle_cache_size = true;
params->has_max_postcopy_bandwidth = true;
qemu_sem_init(&ms->postcopy_pause_sem, 0);
qemu_sem_init(&ms->postcopy_pause_rp_sem, 0);

19
qapi/migration.json
View File

@ -517,6 +517,9 @@
# and a power of 2
# (Since 2.11)
#
# @max-postcopy-bandwidth: Background transfer bandwidth during postcopy.
# Defaults to 0 (unlimited). In bytes per second.
# (Since 3.0)
# Since: 2.4
##
{ 'enum': 'MigrationParameter',
@ -525,7 +528,7 @@
'tls-creds', 'tls-hostname', 'max-bandwidth',
'downtime-limit', 'x-checkpoint-delay', 'block-incremental',
'x-multifd-channels', 'x-multifd-page-count',
'xbzrle-cache-size' ] }
'xbzrle-cache-size', 'max-postcopy-bandwidth' ] }
##
# @MigrateSetParameters:
@ -593,6 +596,10 @@
# needs to be a multiple of the target page size
# and a power of 2
# (Since 2.11)
#
# @max-postcopy-bandwidth: Background transfer bandwidth during postcopy.
# Defaults to 0 (unlimited). In bytes per second.
# (Since 3.0)
# Since: 2.4
##
# TODO either fuse back into MigrationParameters, or make
@ -611,7 +618,8 @@
'*block-incremental': 'bool',
'*x-multifd-channels': 'int',
'*x-multifd-page-count': 'int',
'*xbzrle-cache-size': 'size' } }
'*xbzrle-cache-size': 'size',
'*max-postcopy-bandwidth': 'size' } }
##
# @migrate-set-parameters:
@ -694,6 +702,10 @@
# needs to be a multiple of the target page size
# and a power of 2
# (Since 2.11)
#
# @max-postcopy-bandwidth: Background transfer bandwidth during postcopy.
# Defaults to 0 (unlimited). In bytes per second.
# (Since 3.0)
# Since: 2.4
##
{ 'struct': 'MigrationParameters',
@ -710,7 +722,8 @@
'*block-incremental': 'bool' ,
'*x-multifd-channels': 'uint8',
'*x-multifd-page-count': 'uint32',
'*xbzrle-cache-size': 'size' } }
'*xbzrle-cache-size': 'size',
'*max-postcopy-bandwidth': 'size' } }
##
# @query-migrate-parameters: