[v2,7/8] set the frequency of the dump bitmap process

diff --git a/hmp-commands.hx b/hmp-commands.hx
index 501e011..ce0d9b5 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -1810,6 +1810,21 @@  STEXI
 Cancel the current bitmap dump process
 ETEXI
 
+    {
+        .name       = "ldbsf|log-dirty-bitmap-set-frequency",
+        .args_type  = "frequency:i",
+        .params     = "frequency",
+        .help       = "set the frequency for bitmap dump process\n\t\t\t"
+                      "frequency: the new frequency value to replace the existing",
+        .mhandler.cmd = hmp_log_dirty_bitmap_set_frequency,
+    },
+
+STEXI
+@item ldbsf or log-dirty-bitmap-set-frequency @var{frequency}
+@findex log-dirty-bitmap-set-frequency
+Set the frequency to @var{frequency} (int) for bitmap dump process.
+ETEXI
+
 STEXI
 @end table
 ETEXI
diff --git a/hmp.c b/hmp.c
index fed8795..8765093 100644
--- a/hmp.c
+++ b/hmp.c
@@ -1335,6 +1335,18 @@  void hmp_log_dirty_bitmap_cancel(Monitor *mon, const QDict *qdict)
     qmp_log_dirty_bitmap_cancel(NULL);
 }
 
+void hmp_log_dirty_bitmap_set_frequency(Monitor *mon, const QDict *qdict)
+{
+    int64_t frequency = qdict_get_int(qdict, "frequency");
+    Error *err = NULL;
+    qmp_log_dirty_bitmap_set_frequency(frequency, &err);
+    if (err) {
+        monitor_printf(mon, "log-dirty-bitmap-set-frequency: %s\n",
+                       error_get_pretty(err));
+        error_free(err);
+    }
+}
+
 void hmp_dump_guest_memory(Monitor *mon, const QDict *qdict)
 {
     Error *err = NULL;
diff --git a/hmp.h b/hmp.h
index b600429..991be02 100644
--- a/hmp.h
+++ b/hmp.h
@@ -95,6 +95,7 @@  void hmp_object_add(Monitor *mon, const QDict *qdict);
 void hmp_object_del(Monitor *mon, const QDict *qdict);
 void hmp_log_dirty_bitmap(Monitor *mon, const QDict *qdict);
 void hmp_log_dirty_bitmap_cancel(Monitor *mon, const QDict *qdict);
+void hmp_log_dirty_bitmap_set_frequency(Monitor *mon, const QDict *qdict);
 void object_add_completion(ReadLineState *rs, int nb_args, const char *str);
 void object_del_completion(ReadLineState *rs, int nb_args, const char *str);
 void device_add_completion(ReadLineState *rs, int nb_args, const char *str);
diff --git a/qapi-schema.json b/qapi-schema.json
index 9f9f097..7b7e4de 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -4752,3 +4752,13 @@ 
 # Since 2.1
 ##
 { 'command': 'log-dirty-bitmap-cancel' }
+
+## @log-dirty-bitmap-set-frequency
+#
+# sets the frequency of the dirty bitmap logging process
+# @frequency: the updated frequency value
+#
+# Since 2.1
+##
+{ 'command': 'log-dirty-bitmap-set-frequency',
+  'data': {'frequency': 'int' } }
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 2a8dacc..51a0ad8 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -3625,3 +3625,26 @@  Example:
 <- { "return": {} }
 
 EQMP
+
+    {
+        .name       = "log-dirty-bitmap-set-frequency",
+        .args_type  = "frequency:i",
+        .mhandler.cmd_new = qmp_marshal_input_log_dirty_bitmap_set_frequency,
+    },
+
+SQMP
+log-dirty-bitmap-set-frequency
+--------------------
+
+Update the frequency for the remaining epochs.
+
+Arguments:
+
+- "frequency": the updated frequency (json-int)
+
+Example:
+
+-> { "execute": "log-dirty-bitmap-set-frequency", "arguments": { "value": 1024 } }
+<- { "return": {} }
+
+EQMP
diff --git a/savevm.c b/savevm.c
index ff87254..cfa8dce 100644
--- a/savevm.c
+++ b/savevm.c
@@ -1279,6 +1279,19 @@  void qmp_log_dirty_bitmap_cancel(Error **errp)
     logging_bitmap_cancel(logging_current_state());
 }
 
+void qmp_log_dirty_bitmap_set_frequency(int64_t frequency, Error **errp)
+{
+    BitmapLogState *b = logging_current_state();
+    Error *local_err = NULL;
+    if (!check_value(frequency, MIN_FREQUENCY_VALUE, "frequency", &local_err)) {
+        if (local_err) {
+            error_propagate(errp, local_err);
+            return;
+        }
+    }
+    b->current_frequency = frequency;
+}
+
 void qmp_xen_save_devices_state(const char *filename, Error **errp)
 {
     QEMUFile *f;