Include migrate_set_speed and migrate_set_downtime inside
migrate_set_parameters for setting maximum migration speed and expected
downtime parameters respectively. Also update the query part for both in qmp
and hmp qemu control interfaces.
Signed-off-by: Ashijeet Acharya <ashijeetacha...@gmail.com>
---
hmp.c | 33 +++++++++++++++++++++++++++++++++
include/migration/migration.h | 1 -
migration/migration.c | 30 ++++++++++++++++++++++++++----
qapi-schema.json | 26 +++++++++++++++++++++++---
qmp-commands.hx | 13 ++++++++++---
5 files changed, 92 insertions(+), 11 deletions(-)
diff --git a/hmp.c b/hmp.c
index cc2056e..c92769b 100644
--- a/hmp.c
+++ b/hmp.c
@@ -304,6 +304,12 @@ void hmp_info_migrate_parameters(Monitor *mon, const QDict
*qdict)
monitor_printf(mon, " %s: '%s'",
MigrationParameter_lookup[MIGRATION_PARAMETER_TLS_HOSTNAME],
params->tls_hostname ? : "");
+ monitor_printf(mon, " %s: %" PRId64,
+ MigrationParameter_lookup[MIGRATION_PARAMETER_MAX_BANDWIDTH],
+ params->max_bandwidth);
+ monitor_printf(mon, " %s: %" PRId64,
+ MigrationParameter_lookup[MIGRATION_PARAMETER_DOWNTIME_LIMIT],
+ params->downtime_limit);
monitor_printf(mon, "\n");
}
@@ -1193,6 +1199,7 @@ void hmp_migrate_incoming(Monitor *mon, const QDict
*qdict)
hmp_handle_error(mon, &err);
}
+/* Kept for old-commands compatibility */
void hmp_migrate_set_downtime(Monitor *mon, const QDict *qdict)
{
double value = qdict_get_double(qdict, "value");
@@ -1211,6 +1218,7 @@ void hmp_migrate_set_cache_size(Monitor *mon, const QDict
*qdict)
}
}
+/* Kept for old-commands compatibility */
void hmp_migrate_set_speed(Monitor *mon, const QDict *qdict)
{
int64_t value = qdict_get_int(qdict, "value");
@@ -1251,7 +1259,10 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict
*qdict)
{
const char *param = qdict_get_str(qdict, "parameter");
const char *valuestr = qdict_get_str(qdict, "value");
+ int64_t valuebw = 0;
+ double valuedowntime = 0;
long valueint = 0;
+ char *endp;
Error *err = NULL;
bool has_compress_level = false;
bool has_compress_threads = false;
@@ -1260,6 +1271,8 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict
*qdict)
bool has_cpu_throttle_increment = false;
bool has_tls_creds = false;
bool has_tls_hostname = false;
+ bool has_max_bandwidth = false;
+ bool has_downtime_limit = false;
bool use_int_value = false;
int i;
@@ -1291,6 +1304,24 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict
*qdict)
case MIGRATION_PARAMETER_TLS_HOSTNAME:
has_tls_hostname = true;
break;
+ case MIGRATION_PARAMETER_MAX_BANDWIDTH:
+ has_max_bandwidth = true;
+ valuebw = qemu_strtosz(valuestr, &endp);
+ if (valuebw < 0 || (size_t)valuebw != valuebw || *endp != '\0'
+ || !is_power_of_2(valuebw)) {
+ error_setg(&err, "Invalid size %s", valuestr);
+ goto cleanup;
+ }
+ break;
+ case MIGRATION_PARAMETER_DOWNTIME_LIMIT:
+ has_downtime_limit = true;
+ valuedowntime = strtod(valuestr, &endp);
+ if (valuestr == endp) {
+ error_setg(&err, "Unable to parse '%s' as a number",
+ valuestr);
+ goto cleanup;
+ }
+ break;
}
if (use_int_value) {
@@ -1308,6 +1339,8 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict
*qdict)
has_cpu_throttle_increment, valueint,
has_tls_creds, valuestr,
has_tls_hostname, valuestr,
+ has_max_bandwidth, valuebw,
+ has_downtime_limit, valuedowntime,
&err);
break;
}
diff --git a/include/migration/migration.h b/include/migration/migration.h
index 3c96623..a5429ee 100644
--- a/include/migration/migration.h
+++ b/include/migration/migration.h
@@ -129,7 +129,6 @@ struct MigrationSrcPageRequest {
struct MigrationState
{
- int64_t bandwidth_limit;
size_t bytes_xfer;
size_t xfer_limit;
QemuThread thread;
diff --git a/migration/migration.c b/migration/migration.c
index 955d5ee..4b54b58 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -44,6 +44,9 @@
#define BUFFER_DELAY 100
#define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY)
+/* Amount of nanoseconds we are willing to wait for migration to be down. */
+#define DEFAULT_MIGRATE_SET_DOWNTIME 300000000
+
/* Default compression thread count */
#define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8
/* Default decompression thread count, usually decompression is at
@@ -80,7 +83,6 @@ MigrationState *migrate_get_current(void)
static bool once;
static MigrationState current_migration = {
.state = MIGRATION_STATUS_NONE,
- .bandwidth_limit = MAX_THROTTLE,
.xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE,
.mbps = -1,
.parameters = {
@@ -89,6 +91,8 @@ MigrationState *migrate_get_current(void)
.decompress_threads = DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT,
.cpu_throttle_initial = DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL,
.cpu_throttle_increment = DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT,
+ .max_bandwidth = MAX_THROTTLE,
+ .downtime_limit = DEFAULT_MIGRATE_SET_DOWNTIME,
},
};
@@ -566,6 +570,8 @@ MigrationParameters *qmp_query_migrate_parameters(Error
**errp)
params->cpu_throttle_increment = s->parameters.cpu_throttle_increment;
params->tls_creds = g_strdup(s->parameters.tls_creds);
params->tls_hostname = g_strdup(s->parameters.tls_hostname);
+ params->max_bandwidth = s->parameters.max_bandwidth;
+ params->downtime_limit = s->parameters.downtime_limit;
return params;
}
@@ -773,6 +779,10 @@ void qmp_migrate_set_parameters(bool has_compress_level,
const char *tls_creds,
bool has_tls_hostname,
const char *tls_hostname,
+ bool has_max_bandwidth,
+ int64_t max_bandwidth,
+ bool has_downtime_limit,
+ double downtime_limit,
Error **errp)
{
MigrationState *s = migrate_get_current();
@@ -832,6 +842,12 @@ void qmp_migrate_set_parameters(bool has_compress_level,
g_free(s->parameters.tls_hostname);
s->parameters.tls_hostname = g_strdup(tls_hostname);
}
+ if (has_max_bandwidth) {
+ qmp_migrate_set_speed(max_bandwidth, NULL);
+ }
+ if (has_downtime_limit) {
+ qmp_migrate_set_downtime(downtime_limit, NULL);
+ }
}
@@ -1175,18 +1191,24 @@ void qmp_migrate_set_speed(int64_t value, Error **errp)
}
s = migrate_get_current();
- s->bandwidth_limit = value;
+ s->parameters.max_bandwidth = value;
if (s->to_dst_file) {
qemu_file_set_rate_limit(s->to_dst_file,
- s->bandwidth_limit / XFER_LIMIT_RATIO);
+ s->parameters.max_bandwidth / XFER_LIMIT_RATIO);
}
}
void qmp_migrate_set_downtime(double value, Error **errp)
{
+ MigrationState *s;
+
value *= 1e9;
value = MAX(0, MIN(UINT64_MAX, value));
+
+ s = migrate_get_current();
+
max_downtime = (uint64_t)value;
+ s->parameters.downtime_limit = max_downtime;
}
bool migrate_postcopy_ram(void)
@@ -1858,7 +1880,7 @@ void migrate_fd_connect(MigrationState *s)
qemu_file_set_blocking(s->to_dst_file, true);
qemu_file_set_rate_limit(s->to_dst_file,
- s->bandwidth_limit / XFER_LIMIT_RATIO);
+ s->parameters.max_bandwidth / XFER_LIMIT_RATIO);
/* Notify before starting migration thread */
notifier_list_notify(&migration_state_notifiers, s);
diff --git a/qapi-schema.json b/qapi-schema.json
index 5658723..250eac5 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -637,12 +637,18 @@
# hostname must be provided so that the server's x509
# certificate identity can be validated. (Since 2.7)
#
+# @max-bandwidth: to set maximum speed for migration. A value lesser than
+# zero will be automatically round upto zero. Since 2.8)
+#
+# @downtime-limit: set maximum tolerated downtime for migration. Since 2.8)
+#
# Since: 2.4
##
{ 'enum': 'MigrationParameter',
'data': ['compress-level', 'compress-threads', 'decompress-threads',
'cpu-throttle-initial', 'cpu-throttle-increment',
- 'tls-creds', 'tls-hostname'] }
+ 'tls-creds', 'tls-hostname', 'max-bandwidth',
+ 'downtime-limit'] }
#
# @migrate-set-parameters
@@ -678,6 +684,11 @@
# hostname must be provided so that the server's x509
# certificate identity can be validated. (Since 2.7)
#
+# @max-bandwidth: to set maximum speed for migration. A value lesser than
+# zero will be automatically round upto zero. Since 2.8)
+#
+# @downtime-limit: set maximum tolerated downtime for migration. Since 2.8)
+#
# Since: 2.4
##
{ 'command': 'migrate-set-parameters',
@@ -687,7 +698,9 @@
'*cpu-throttle-initial': 'int',
'*cpu-throttle-increment': 'int',
'*tls-creds': 'str',
- '*tls-hostname': 'str'} }
+ '*tls-hostname': 'str',
+ '*max-bandwidth': 'int',
+ '*downtime-limit': 'number'} }
#
# @MigrationParameters
@@ -721,6 +734,11 @@
# hostname must be provided so that the server's x509
# certificate identity can be validated. (Since 2.7)
#
+# @max-bandwidth: to set maximum speed for migration. A value lesser than
+# zero will be automatically round upto zero. (Since 2.8)
+#
+# @downtime-limit: set maximum tolerated downtime for migration. Since 2.8)
+#
# Since: 2.4
##
{ 'struct': 'MigrationParameters',
@@ -730,7 +748,9 @@
'cpu-throttle-initial': 'int',
'cpu-throttle-increment': 'int',
'tls-creds': 'str',
- 'tls-hostname': 'str'} }
+ 'tls-hostname': 'str',
+ 'max-bandwidth': 'int',
+ 'downtime-limit': 'int'} }
##
# @query-migrate-parameters
#
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 6866264..0418cab 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -3790,7 +3790,9 @@ Set migration parameters
throttled for auto-converge (json-int)
- "cpu-throttle-increment": set throttle increasing percentage for
auto-converge (json-int)
-
+- "max-bandwidth": set maximum speed for migrations (json-int)
+- "downtime-limit": set maximum tolerated downtime (in seconds) for
+ migrations (json-number)
Arguments:
Example:
@@ -3803,7 +3805,7 @@ EQMP
{
.name = "migrate-set-parameters",
.args_type =
-
"compress-level:i?,compress-threads:i?,decompress-threads:i?,cpu-throttle-initial:i?,cpu-throttle-increment:i?",
+
"compress-level:i?,compress-threads:i?,decompress-threads:i?,cpu-throttle-initial:i?,cpu-throttle-increment:i?,max-bandwidth:i?,downtime-limit:T?",
.mhandler.cmd_new = qmp_marshal_migrate_set_parameters,
},
SQMP
@@ -3820,6 +3822,9 @@ Query current migration parameters
throttled (json-int)
- "cpu-throttle-increment" : throttle increasing percentage for
auto-converge (json-int)
+ - "max-bandwidth" : maximium migration speed (json-int)
+ - "downtime-limit" : maximum tolerated downtime of migration
+ (json-int)
Arguments:
@@ -3832,7 +3837,9 @@ Example:
"cpu-throttle-increment": 10,
"compress-threads": 8,
"compress-level": 1,
- "cpu-throttle-initial": 20
+ "cpu-throttle-initial": 20,
+ "max-downtime": 33554432,
+ "downtime-limit": 300000000
}
}
--
2.6.2
