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migrate: move max-bandwidth and downtime-limit to migrate_set_parameter 

Mark the old commands 'migrate_set_speed' and 'migrate_set_downtime' as
deprecated.
Move max-bandwidth and downtime-limit into migrate-set-parameters for
setting maximum migration speed and expected downtime limit parameters
respectively.
Change downtime units to milliseconds (only for new-command) and set
its upper bound limit to 2000 seconds.
Update the query part in both hmp and qmp qemu control interfaces.

Signed-off-by: Ashijeet Acharya <ashijeetacharya@gmail.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Ashijeet Acharya 2016-09-15 21:50:28 +05:30 committed by Juan Quintela
parent 9308ae5485
commit 2ff3025797
5 changed files with 107 additions and 40 deletions
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13
docs/qmp-commands.txt
View File

@ -2910,7 +2910,9 @@ 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 (in bytes/sec) (json-int)
- "downtime-limit": set maximum tolerated downtime (in milliseconds) for
migrations (json-int)
Arguments:
Example:
@ -2931,7 +2933,10 @@ Query current migration parameters
throttled (json-int)
- "cpu-throttle-increment" : throttle increasing percentage for
auto-converge (json-int)
- "max-bandwidth" : maximium migration speed in bytes per second
(json-int)
- "downtime-limit" : maximum tolerated downtime of migration in
milliseconds (json-int)
Arguments:
Example:
@ -2943,7 +2948,9 @@ Example:
"cpu-throttle-increment": 10,
"compress-threads": 8,
"compress-level": 1,
"cpu-throttle-initial": 20
"cpu-throttle-initial": 20,
"max-bandwidth": 33554432,
"downtime-limit": 300
}
}

27
hmp.c
View File

@ -310,6 +310,14 @@ void hmp_info_migrate_parameters(Monitor *mon, const QDict *qdict)
monitor_printf(mon, " %s: '%s'",
MigrationParameter_lookup[MIGRATION_PARAMETER_TLS_HOSTNAME],
params->has_tls_hostname ? params->tls_hostname : "");
assert(params->has_max_bandwidth);
monitor_printf(mon, " %s: %" PRId64 " bytes/second",
MigrationParameter_lookup[MIGRATION_PARAMETER_MAX_BANDWIDTH],
params->max_bandwidth);
assert(params->has_downtime_limit);
monitor_printf(mon, " %s: %" PRId64 " milliseconds",
MigrationParameter_lookup[MIGRATION_PARAMETER_DOWNTIME_LIMIT],
params->downtime_limit);
monitor_printf(mon, "\n");
}
@ -1265,6 +1273,7 @@ void hmp_migrate_incoming(Monitor *mon, const QDict *qdict)
hmp_handle_error(mon, &err);
}
/* Kept for backwards compatibility */
void hmp_migrate_set_downtime(Monitor *mon, const QDict *qdict)
{
double value = qdict_get_double(qdict, "value");
@ -1283,6 +1292,7 @@ void hmp_migrate_set_cache_size(Monitor *mon, const QDict *qdict)
}
}
/* Kept for backwards compatibility */
void hmp_migrate_set_speed(Monitor *mon, const QDict *qdict)
{
int64_t value = qdict_get_int(qdict, "value");
@ -1323,7 +1333,9 @@ 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;
long valueint = 0;
char *endp;
Error *err = NULL;
bool use_int_value = false;
int i;
@ -1360,6 +1372,20 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict)
p.has_tls_hostname = true;
p.tls_hostname = (char *) valuestr;
break;
case MIGRATION_PARAMETER_MAX_BANDWIDTH:
p.has_max_bandwidth = true;
valuebw = qemu_strtosz(valuestr, &endp);
if (valuebw < 0 || (size_t)valuebw != valuebw
|| *endp != '\0') {
error_setg(&err, "Invalid size %s", valuestr);
goto cleanup;
}
p.max_bandwidth = valuebw;
break;
case MIGRATION_PARAMETER_DOWNTIME_LIMIT:
p.has_downtime_limit = true;
use_int_value = true;
break;
}
if (use_int_value) {
@ -1375,6 +1401,7 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict)
p.decompress_threads = valueint;
p.cpu_throttle_initial = valueint;
p.cpu_throttle_increment = valueint;
p.downtime_limit = valueint;
}
qmp_migrate_set_parameters(&p, &err);

1
include/migration/migration.h
View File

@ -129,7 +129,6 @@ struct MigrationSrcPageRequest {
struct MigrationState
{
int64_t bandwidth_limit;
size_t bytes_xfer;
size_t xfer_limit;
QemuThread thread;

83
migration/migration.c
View File

@ -44,6 +44,10 @@
#define BUFFER_DELAY 100
#define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY)
/* Time in milliseconds we are allowed to stop the source,
* for sending the last part */
#define DEFAULT_MIGRATE_SET_DOWNTIME 300
/* Default compression thread count */
#define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8
/* Default decompression thread count, usually decompression is at
@ -80,7 +84,6 @@ 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 +92,8 @@ 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,
},
};
@ -517,17 +522,6 @@ void migrate_send_rp_pong(MigrationIncomingState *mis,
migrate_send_rp_message(mis, MIG_RP_MSG_PONG, sizeof(buf), &buf);
}
/* amount of nanoseconds we are willing to wait for migration to be down.
* the choice of nanoseconds is because it is the maximum resolution that
* get_clock() can achieve. It is an internal measure. All user-visible
* units must be in seconds */
static uint64_t max_downtime = 300000000;
uint64_t migrate_max_downtime(void)
{
return max_downtime;
}
MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp)
{
MigrationCapabilityStatusList *head = NULL;
@ -573,6 +567,10 @@ MigrationParameters *qmp_query_migrate_parameters(Error **errp)
params->tls_creds = g_strdup(s->parameters.tls_creds);
params->has_tls_hostname = !!s->parameters.tls_hostname;
params->tls_hostname = g_strdup(s->parameters.tls_hostname);
params->has_max_bandwidth = true;
params->max_bandwidth = s->parameters.max_bandwidth;
params->has_downtime_limit = true;
params->downtime_limit = s->parameters.downtime_limit;
return params;
}
@ -806,6 +804,19 @@ void qmp_migrate_set_parameters(MigrationParameters *params, Error **errp)
"an integer in the range of 1 to 99");
return;
}
if (params->has_max_bandwidth &&
(params->max_bandwidth < 0 || params->max_bandwidth > SIZE_MAX)) {
error_setg(errp, "Parameter 'max_bandwidth' expects an integer in the"
" range of 0 to %zu bytes/second", SIZE_MAX);
return;
}
if (params->has_downtime_limit &&
(params->downtime_limit < 0 || params->downtime_limit > 2000000)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
"downtime_limit",
"an integer in the range of 0 to 2000000 milliseconds");
return;
}
if (params->has_compress_level) {
s->parameters.compress_level = params->compress_level;
@ -830,6 +841,16 @@ void qmp_migrate_set_parameters(MigrationParameters *params, Error **errp)
g_free(s->parameters.tls_hostname);
s->parameters.tls_hostname = g_strdup(params->tls_hostname);
}
if (params->has_max_bandwidth) {
s->parameters.max_bandwidth = params->max_bandwidth;
if (s->to_dst_file) {
qemu_file_set_rate_limit(s->to_dst_file,
s->parameters.max_bandwidth / XFER_LIMIT_RATIO);
}
}
if (params->has_downtime_limit) {
s->parameters.downtime_limit = params->downtime_limit;
}
}
@ -1163,28 +1184,25 @@ int64_t qmp_query_migrate_cache_size(Error **errp)
void qmp_migrate_set_speed(int64_t value, Error **errp)
{
MigrationState *s;
MigrationParameters p = {
.has_max_bandwidth = true,
.max_bandwidth = value,
};
if (value < 0) {
value = 0;
}
if (value > SIZE_MAX) {
value = SIZE_MAX;
}
s = migrate_get_current();
s->bandwidth_limit = value;
if (s->to_dst_file) {
qemu_file_set_rate_limit(s->to_dst_file,
s->bandwidth_limit / XFER_LIMIT_RATIO);
}
qmp_migrate_set_parameters(&p, errp);
}
void qmp_migrate_set_downtime(double value, Error **errp)
{
value *= 1e9;
value = MAX(0, MIN(UINT64_MAX, value));
max_downtime = (uint64_t)value;
value *= 1000; /* Convert to milliseconds */
value = MAX(0, MIN(INT64_MAX, value));
MigrationParameters p = {
.has_downtime_limit = true,
.downtime_limit = value,
};
qmp_migrate_set_parameters(&p, errp);
}
bool migrate_postcopy_ram(void)
@ -1791,7 +1809,7 @@ static void *migration_thread(void *opaque)
initial_bytes;
uint64_t time_spent = current_time - initial_time;
double bandwidth = (double)transferred_bytes / time_spent;
max_size = bandwidth * migrate_max_downtime() / 1000000;
max_size = bandwidth * s->parameters.downtime_limit;
s->mbps = (((double) transferred_bytes * 8.0) /
((double) time_spent / 1000.0)) / 1000.0 / 1000.0;
@ -1850,13 +1868,12 @@ static void *migration_thread(void *opaque)
void migrate_fd_connect(MigrationState *s)
{
/* This is a best 1st approximation. ns to ms */
s->expected_downtime = max_downtime/1000000;
s->expected_downtime = s->parameters.downtime_limit;
s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup, 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);

23
qapi-schema.json
View File

@ -658,12 +658,19 @@
# 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. maximum speed in
# bytes per second. (Since 2.8)
#
# @downtime-limit: set maximum tolerated downtime for migration. maximum
# downtime in milliseconds (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
@ -712,6 +719,12 @@
# 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. maximum speed in
# bytes per second. (Since 2.8)
#
# @downtime-limit: set maximum tolerated downtime for migration. maximum
# downtime in milliseconds (Since 2.8)
#
# Since: 2.4
##
{ 'struct': 'MigrationParameters',
@ -721,7 +734,9 @@
'*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
#
@ -1803,6 +1818,8 @@
#
# Returns: nothing on success
#
# Notes: This command is deprecated in favor of 'migrate-set-parameters'
#
# Since: 0.14.0
##
{ 'command': 'migrate_set_downtime', 'data': {'value': 'number'} }
@ -1816,7 +1833,7 @@
#
# Returns: nothing on success
#
# Notes: A value lesser than zero will be automatically round up to zero.
# Notes: This command is deprecated in favor of 'migrate-set-parameters'
#
# Since: 0.14.0
##