migration/throttle: Add cpu-throttle-tailslow migration parameter

At the tail stage of throttling, the Guest is very sensitive to
CPU percentage while the @cpu-throttle-increment is excessive
usually at tail stage.

If this parameter is true, we will compute the ideal CPU percentage
used by the Guest, which may exactly make the dirty rate match the
dirty rate threshold. Then we will choose a smaller throttle increment
between the one specified by @cpu-throttle-increment and the one
generated by ideal CPU percentage.

Therefore, it is compatible to traditional throttling, meanwhile
the throttle increment won't be excessive at tail stage. This may
make migration time longer, and is disabled by default.

Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com>
Message-Id: <20200413101508.54793-1-zhukeqian1@huawei.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/migration/migration.c b/migration/migration.c
index 79f16f6625..f5dbffc442 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -785,6 +785,8 @@ MigrationParameters *qmp_query_migrate_parameters(Error **errp)
     params->cpu_throttle_initial = s->parameters.cpu_throttle_initial;
     params->has_cpu_throttle_increment = true;
     params->cpu_throttle_increment = s->parameters.cpu_throttle_increment;
+    params->has_cpu_throttle_tailslow = true;
+    params->cpu_throttle_tailslow = s->parameters.cpu_throttle_tailslow;
     params->has_tls_creds = true;
     params->tls_creds = g_strdup(s->parameters.tls_creds);
     params->has_tls_hostname = true;
@@ -1327,6 +1329,10 @@ static void migrate_params_test_apply(MigrateSetParameters *params,
         dest->cpu_throttle_increment = params->cpu_throttle_increment;
     }
 
+    if (params->has_cpu_throttle_tailslow) {
+        dest->cpu_throttle_tailslow = params->cpu_throttle_tailslow;
+    }
+
     if (params->has_tls_creds) {
         assert(params->tls_creds->type == QTYPE_QSTRING);
         dest->tls_creds = g_strdup(params->tls_creds->u.s);
@@ -1415,6 +1421,10 @@ static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
         s->parameters.cpu_throttle_increment = params->cpu_throttle_increment;
     }
 
+    if (params->has_cpu_throttle_tailslow) {
+        s->parameters.cpu_throttle_tailslow = params->cpu_throttle_tailslow;
+    }
+
     if (params->has_tls_creds) {
         g_free(s->parameters.tls_creds);
         assert(params->tls_creds->type == QTYPE_QSTRING);
@@ -3597,6 +3607,8 @@ static Property migration_properties[] = {
     DEFINE_PROP_UINT8("x-cpu-throttle-increment", MigrationState,
                       parameters.cpu_throttle_increment,
                       DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT),
+    DEFINE_PROP_BOOL("x-cpu-throttle-tailslow", MigrationState,
+                      parameters.cpu_throttle_tailslow, false),
     DEFINE_PROP_SIZE("x-max-bandwidth", MigrationState,
                       parameters.max_bandwidth, MAX_THROTTLE),
     DEFINE_PROP_UINT64("x-downtime-limit", MigrationState,
@@ -3703,6 +3715,7 @@ static void migration_instance_init(Object *obj)
     params->has_throttle_trigger_threshold = true;
     params->has_cpu_throttle_initial = true;
     params->has_cpu_throttle_increment = true;
+    params->has_cpu_throttle_tailslow = true;
     params->has_max_bandwidth = true;
     params->has_downtime_limit = true;
     params->has_x_checkpoint_delay = true;