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qapi/migration: Introduce vcpu-dirty-limit parameters 
Introduce "vcpu-dirty-limit" migration parameter used
to limit dirty page rate during live migration.

"vcpu-dirty-limit" and "x-vcpu-dirty-limit-period" are
two dirty-limit-related migration parameters, which can
be set before and during live migration by qmp
migrate-set-parameters.

This two parameters are used to help implement the dirty
page rate limit algo of migration.

Signed-off-by: Hyman Huang(黄勇) <yong.huang@smartx.com>
Acked-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Message-Id: <168618975839.6361.17407633874747688653-3@git.sr.ht>
Signed-off-by: Juan Quintela <quintela@redhat.com>
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@HuangSuiXiao
HuangSuiXiao authored and Juan Quintela committed Jun 22, 2023
1 parent 065f076 commit 010d1eb
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Showing 3 changed files with 44 additions and 3 deletions.
8 changes: 8 additions & 0 deletions migration/migration-hmp-cmds.c
View file
Expand Up @@ -368,6 +368,10 @@ void hmp_info_migrate_parameters(Monitor *mon, const QDict *qdict)
monitor_printf(mon, "%s: %" PRIu64 " ms\n",
MigrationParameter_str(MIGRATION_PARAMETER_X_VCPU_DIRTY_LIMIT_PERIOD),
params->x_vcpu_dirty_limit_period);

monitor_printf(mon, "%s: %" PRIu64 " MB/s\n",
MigrationParameter_str(MIGRATION_PARAMETER_VCPU_DIRTY_LIMIT),
params->vcpu_dirty_limit);
}

qapi_free_MigrationParameters(params);
Expand Down Expand Up @@ -628,6 +632,10 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict)
p->has_x_vcpu_dirty_limit_period = true;
visit_type_size(v, param, &p->x_vcpu_dirty_limit_period, &err);
break;
case MIGRATION_PARAMETER_VCPU_DIRTY_LIMIT:
p->has_vcpu_dirty_limit = true;
visit_type_size(v, param, &p->vcpu_dirty_limit, &err);
break;
default:
assert(0);
}
Expand Down
21 changes: 21 additions & 0 deletions migration/options.c
View file
Expand Up @@ -81,6 +81,7 @@
DEFINE_PROP_BOOL(name, MigrationState, capabilities[x], false)

#define DEFAULT_MIGRATE_VCPU_DIRTY_LIMIT_PERIOD 1000 /* milliseconds */
#define DEFAULT_MIGRATE_VCPU_DIRTY_LIMIT 1 /* MB/s */

Property migration_properties[] = {
DEFINE_PROP_BOOL("store-global-state", MigrationState,
Expand Down Expand Up @@ -168,6 +169,9 @@ Property migration_properties[] = {
DEFINE_PROP_UINT64("x-vcpu-dirty-limit-period", MigrationState,
parameters.x_vcpu_dirty_limit_period,
DEFAULT_MIGRATE_VCPU_DIRTY_LIMIT_PERIOD),
DEFINE_PROP_UINT64("vcpu-dirty-limit", MigrationState,
parameters.vcpu_dirty_limit,
DEFAULT_MIGRATE_VCPU_DIRTY_LIMIT),

/* Migration capabilities */
DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE),
Expand Down Expand Up @@ -898,6 +902,8 @@ MigrationParameters *qmp_query_migrate_parameters(Error **errp)

params->has_x_vcpu_dirty_limit_period = true;
params->x_vcpu_dirty_limit_period = s->parameters.x_vcpu_dirty_limit_period;
params->has_vcpu_dirty_limit = true;
params->vcpu_dirty_limit = s->parameters.vcpu_dirty_limit;

return params;
}
Expand Down Expand Up @@ -932,6 +938,7 @@ void migrate_params_init(MigrationParameters *params)
params->has_announce_rounds = true;
params->has_announce_step = true;
params->has_x_vcpu_dirty_limit_period = true;
params->has_vcpu_dirty_limit = true;
}

/*
Expand Down Expand Up @@ -1101,6 +1108,14 @@ bool migrate_params_check(MigrationParameters *params, Error **errp)
return false;
}

if (params->has_vcpu_dirty_limit &&
(params->vcpu_dirty_limit < 1)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
"vcpu_dirty_limit",
"is invalid, it must greater then 1 MB/s");
return false;
}

return true;
}

Expand Down Expand Up @@ -1205,6 +1220,9 @@ static void migrate_params_test_apply(MigrateSetParameters *params,
dest->x_vcpu_dirty_limit_period =
params->x_vcpu_dirty_limit_period;
}
if (params->has_vcpu_dirty_limit) {
dest->vcpu_dirty_limit = params->vcpu_dirty_limit;
}
}

static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
Expand Down Expand Up @@ -1328,6 +1346,9 @@ static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
s->parameters.x_vcpu_dirty_limit_period =
params->x_vcpu_dirty_limit_period;
}
if (params->has_vcpu_dirty_limit) {
s->parameters.vcpu_dirty_limit = params->vcpu_dirty_limit;
}
}

void qmp_migrate_set_parameters(MigrateSetParameters *params, Error **errp)
Expand Down
18 changes: 15 additions & 3 deletions qapi/migration.json
View file
Expand Up @@ -783,6 +783,9 @@
# live migration. Should be in the range 1 to 1000ms,
# defaults to 1000ms. (Since 8.1)
#
# @vcpu-dirty-limit: Dirtyrate limit (MB/s) during live migration.
# Defaults to 1. (Since 8.1)
#
# Features:
#
# @unstable: Members @x-checkpoint-delay and @x-vcpu-dirty-limit-period
Expand All @@ -806,7 +809,8 @@
'max-cpu-throttle', 'multifd-compression',
'multifd-zlib-level', 'multifd-zstd-level',
'block-bitmap-mapping',
{ 'name': 'x-vcpu-dirty-limit-period', 'features': ['unstable'] } ] }
{ 'name': 'x-vcpu-dirty-limit-period', 'features': ['unstable'] },
'vcpu-dirty-limit'] }

##
# @MigrateSetParameters:
Expand Down Expand Up @@ -945,6 +949,9 @@
# live migration. Should be in the range 1 to 1000ms,
# defaults to 1000ms. (Since 8.1)
#
# @vcpu-dirty-limit: Dirtyrate limit (MB/s) during live migration.
# Defaults to 1. (Since 8.1)
#
# Features:
#
# @unstable: Members @x-checkpoint-delay and @x-vcpu-dirty-limit-period
Expand Down Expand Up @@ -985,7 +992,8 @@
'*multifd-zstd-level': 'uint8',
'*block-bitmap-mapping': [ 'BitmapMigrationNodeAlias' ],
'*x-vcpu-dirty-limit-period': { 'type': 'uint64',
'features': [ 'unstable' ] } } }
'features': [ 'unstable' ] },
'*vcpu-dirty-limit': 'uint64'} }

##
# @migrate-set-parameters:
Expand Down Expand Up @@ -1144,6 +1152,9 @@
# live migration. Should be in the range 1 to 1000ms,
# defaults to 1000ms. (Since 8.1)
#
# @vcpu-dirty-limit: Dirtyrate limit (MB/s) during live migration.
# Defaults to 1. (Since 8.1)
#
# Features:
#
# @unstable: Members @x-checkpoint-delay and @x-vcpu-dirty-limit-period
Expand Down Expand Up @@ -1181,7 +1192,8 @@
'*multifd-zstd-level': 'uint8',
'*block-bitmap-mapping': [ 'BitmapMigrationNodeAlias' ],
'*x-vcpu-dirty-limit-period': { 'type': 'uint64',
'features': [ 'unstable' ] } } }
'features': [ 'unstable' ] },
'*vcpu-dirty-limit': 'uint64'} }

##
# @query-migrate-parameters:
Expand Down

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