[PATCH v5 4/8] multifd: Add multifd-zlib-level parameter

[Juan Quintela <quintela@redhat.com>]

It will indicate which level use for compression.

Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration/migration.c | 15 +++++++++++++++
 monitor/hmp-cmds.c    |  4 ++++
 qapi/migration.json   | 30 +++++++++++++++++++++++++++---
 3 files changed, 46 insertions(+), 3 deletions(-)

diff --git a/migration/migration.c b/migration/migration.c
index 06f6c2d529..4f88f8e958 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -89,6 +89,8 @@
 #define DEFAULT_MIGRATE_X_CHECKPOINT_DELAY (200 * 100)
 #define DEFAULT_MIGRATE_MULTIFD_CHANNELS 2
 #define DEFAULT_MIGRATE_MULTIFD_METHOD MULTIFD_METHOD_NONE
+/*0: means nocompress, 1: best speed, ... 9: best compress ratio */
+#define DEFAULT_MIGRATE_MULTIFD_ZLIB_LEVEL 1
 
 /* Background transfer rate for postcopy, 0 means unlimited, note
  * that page requests can still exceed this limit.
@@ -801,6 +803,8 @@ MigrationParameters *qmp_query_migrate_parameters(Error **errp)
     params->multifd_channels = s->parameters.multifd_channels;
     params->has_multifd_method = true;
     params->multifd_method = s->parameters.multifd_method;
+    params->has_multifd_zlib_level = true;
+    params->multifd_zlib_level = s->parameters.multifd_zlib_level;
     params->has_xbzrle_cache_size = true;
     params->xbzrle_cache_size = s->parameters.xbzrle_cache_size;
     params->has_max_postcopy_bandwidth = true;
@@ -1208,6 +1212,13 @@ static bool migrate_params_check(MigrationParameters *params, Error **errp)
         return false;
     }
 
+    if (params->has_multifd_zlib_level &&
+        (params->multifd_zlib_level > 9)) {
+        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "multifd_zlib_level",
+                   "is invalid, it should be in the range of 0 to 9");
+        return false;
+    }
+
     if (params->has_xbzrle_cache_size &&
         (params->xbzrle_cache_size < qemu_target_page_size() ||
          !is_power_of_2(params->xbzrle_cache_size))) {
@@ -3536,6 +3547,9 @@ static Property migration_properties[] = {
     DEFINE_PROP_MULTIFD_METHOD("multifd-method", MigrationState,
                       parameters.multifd_method,
                       DEFAULT_MIGRATE_MULTIFD_METHOD),
+    DEFINE_PROP_UINT8("multifd-zlib-level", MigrationState,
+                      parameters.multifd_zlib_level,
+                      DEFAULT_MIGRATE_MULTIFD_ZLIB_LEVEL),
     DEFINE_PROP_SIZE("xbzrle-cache-size", MigrationState,
                       parameters.xbzrle_cache_size,
                       DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE),
@@ -3627,6 +3641,7 @@ static void migration_instance_init(Object *obj)
     params->has_block_incremental = true;
     params->has_multifd_channels = true;
     params->has_multifd_method = true;
+    params->has_multifd_zlib_level = true;
     params->has_xbzrle_cache_size = true;
     params->has_max_postcopy_bandwidth = true;
     params->has_max_cpu_throttle = true;
diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
index 16f01d4244..7f11866446 100644
--- a/monitor/hmp-cmds.c
+++ b/monitor/hmp-cmds.c
@@ -1836,6 +1836,10 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict)
         }
         p->multifd_method = compress_type;
         break;
+    case MIGRATION_PARAMETER_MULTIFD_ZLIB_LEVEL:
+        p->has_multifd_zlib_level = true;
+        visit_type_int(v, param, &p->multifd_zlib_level, &err);
+        break;
     case MIGRATION_PARAMETER_XBZRLE_CACHE_SIZE:
         p->has_xbzrle_cache_size = true;
         visit_type_size(v, param, &cache_size, &err);
diff --git a/qapi/migration.json b/qapi/migration.json
index 96a126751c..289dce0da7 100644
--- a/qapi/migration.json
+++ b/qapi/migration.json
@@ -602,6 +602,13 @@
 # @multifd-method: Which compression method to use.
 #                  Defaults to none. (Since 5.0)
 #
+# @multifd-zlib-level: Set the compression level to be used in live
+#          migration, the compression level is an integer between 0
+#          and 9, where 0 means no compression, 1 means the best
+#          compression speed, and 9 means best compression ratio which
+#          will consume more CPU.
+#          Defaults to 1. (Since 5.0)
+#
 # Since: 2.4
 ##
 { 'enum': 'MigrationParameter',
@@ -614,7 +621,8 @@
            'downtime-limit', 'x-checkpoint-delay', 'block-incremental',
            'multifd-channels',
            'xbzrle-cache-size', 'max-postcopy-bandwidth',
-           'max-cpu-throttle', 'multifd-method' ] }
+           'max-cpu-throttle', 'multifd-method',
+           'multifd-zlib-level' ] }
 
 ##
 # @MigrateSetParameters:
@@ -707,6 +715,13 @@
 # @multifd-method: Which compression method to use.
 #                  Defaults to none. (Since 5.0)
 #
+# @multifd-zlib-level: Set the compression level to be used in live
+#          migration, the compression level is an integer between 0
+#          and 9, where 0 means no compression, 1 means the best
+#          compression speed, and 9 means best compression ratio which
+#          will consume more CPU.
+#          Defaults to 1. (Since 5.0)
+#
 # Since: 2.4
 ##
 # TODO either fuse back into MigrationParameters, or make
@@ -733,7 +748,8 @@
             '*xbzrle-cache-size': 'size',
             '*max-postcopy-bandwidth': 'size',
             '*max-cpu-throttle': 'int',
-            '*multifd-method': 'MultiFDMethod' } }
+            '*multifd-method': 'MultiFDMethod',
+            '*multifd-zlib-level': 'int' } }
 
 ##
 # @migrate-set-parameters:
@@ -846,6 +862,13 @@
 # @multifd-method: Which compression method to use.
 #                  Defaults to none. (Since 5.0)
 #
+# @multifd-zlib-level: Set the compression level to be used in live
+#          migration, the compression level is an integer between 0
+#          and 9, where 0 means no compression, 1 means the best
+#          compression speed, and 9 means best compression ratio which
+#          will consume more CPU.
+#          Defaults to 1. (Since 5.0)
+#
 # Since: 2.4
 ##
 { 'struct': 'MigrationParameters',
@@ -870,7 +893,8 @@
             '*xbzrle-cache-size': 'size',
 	    '*max-postcopy-bandwidth': 'size',
             '*max-cpu-throttle': 'uint8',
-            '*multifd-method': 'MultiFDMethod' } }
+            '*multifd-method': 'MultiFDMethod',
+            '*multifd-zlib-level': 'uint8' } }
 
 ##
 # @query-migrate-parameters:
-- 
2.24.1