Allow non-default dynamic tuning implementations

Let plugins choose between the default (periodic)
dynamic tuning and their own implementation.

If a plugin uses the default periodic tuning,
it must implement the update_tuning method
which is then periodically called by the main
daemon thread.

Non-periodic implementations may, e.g., start
their own threads.

tuned/daemon/daemon.py

@@ -19,27 +19,28 @@ def __init__(self, unit_manager, profile_loader, profile_names=None, config=None
 		self._daemon = consts.CFG_DEF_DAEMON
 		self._sleep_interval = int(consts.CFG_DEF_SLEEP_INTERVAL)
 		self._update_interval = int(consts.CFG_DEF_UPDATE_INTERVAL)
-		self._dynamic_tuning = consts.CFG_DEF_DYNAMIC_TUNING
 		self._recommend_command = True
 		self._rollback = consts.CFG_DEF_ROLLBACK
+		dynamic_plugins = []
 		if config is not None:
 			self._daemon = config.get_bool(consts.CFG_DAEMON, consts.CFG_DEF_DAEMON)
 			self._sleep_interval = int(config.get(consts.CFG_SLEEP_INTERVAL, consts.CFG_DEF_SLEEP_INTERVAL))
 			self._update_interval = int(config.get(consts.CFG_UPDATE_INTERVAL, consts.CFG_DEF_UPDATE_INTERVAL))
-			self._dynamic_tuning = config.get_bool(consts.CFG_DYNAMIC_TUNING, consts.CFG_DEF_DYNAMIC_TUNING)
 			self._recommend_command = config.get_bool(consts.CFG_RECOMMEND_COMMAND, consts.CFG_DEF_RECOMMEND_COMMAND)
 			self._rollback = config.get(consts.CFG_ROLLBACK, consts.CFG_DEF_ROLLBACK)
+			dynamic_plugins = config.get(consts.CFG_DYNAMIC_PLUGINS, [])
 		self._application = application
+		self._periodic_tuning = any(plugin.uses_periodic_tuning() for plugin in dynamic_plugins)
 		if self._sleep_interval <= 0:
 			self._sleep_interval = int(consts.CFG_DEF_SLEEP_INTERVAL)
 		if self._update_interval == 0:
-			self._dynamic_tuning = False
+			self._periodic_tuning = False
 		elif self._update_interval < self._sleep_interval:
 			self._update_interval = self._sleep_interval
 		self._sleep_cycles = self._update_interval // self._sleep_interval
-		log.info("using sleep interval of %d second(s)" % self._sleep_interval)
-		if self._dynamic_tuning:
-			log.info("dynamic tuning is enabled (can be overridden by plugins)")
+		if self._periodic_tuning:
+			log.info("using sleep interval of %d second(s)" % self._sleep_interval)
+			log.info("periodic tuning is enabled")
 			log.info("using update interval of %d second(s) (%d times of the sleep interval)" % (self._sleep_cycles * self._sleep_interval, self._sleep_cycles))
 
 		self._profile_recommender = ProfileRecommender(is_hardcoded = not self._recommend_command)
@@ -215,7 +216,7 @@ def _thread_code(self):
 			# For more details see TuneD rhbz#917587.
 			_sleep_cnt = self._sleep_cycles
 			while not self._cmd.wait(self._terminate, self._sleep_interval):
-				if self._dynamic_tuning:
+				if self._periodic_tuning:
 					_sleep_cnt -= 1
 					if _sleep_cnt <= 0:
 						_sleep_cnt = self._sleep_cycles

tuned/plugins/base.py

@@ -61,6 +61,10 @@ def supports_static_tuning(cls):
 	def supports_dynamic_tuning(cls):
 		raise NotImplementedError()
 
+	@classmethod
+	def uses_periodic_tuning(cls):
+		raise NotImplementedError()
+
 	#
 	# Plugin configuration manipulation and helpers.
 	#
@@ -309,7 +313,7 @@ def instance_update_tuning(self, instance):
 		"""
 		if not instance.active:
 			return
-		if instance.dynamic_tuning_enabled:
+		if instance.dynamic_tuning_enabled and self.uses_periodic_tuning():
 			self._run_for_each_device(instance, self._instance_update_dynamic, instance.processed_devices.copy())
 
 	def instance_unapply_tuning(self, instance, rollback = consts.ROLLBACK_SOFT):
@@ -321,6 +325,7 @@ def instance_unapply_tuning(self, instance, rollback = consts.ROLLBACK_SOFT):
 
 		if instance.dynamic_tuning_enabled:
 			self._run_for_each_device(instance, self._instance_unapply_dynamic, instance.processed_devices)
+			self._instance_deinit_dynamic(instance)
 		if instance.static_tuning_enabled:
 			self._call_device_script(instance, instance.script_post,
 					"unapply", instance.processed_devices,
@@ -350,11 +355,14 @@ def _instance_unapply_static(self, instance, rollback = consts.ROLLBACK_SOFT):
 	def _instance_init_dynamic(self, instance):
 		pass
 
+	def _instance_deinit_dynamic(self, instance):
+		pass
+
 	def _instance_apply_dynamic(self, instance, device):
 		for option in [opt for opt in self._options_used_by_dynamic if self._storage_get(instance, self._commands[opt], device) is None]:
 			self._check_and_save_value(instance, self._commands[option], device)
-
-		self._instance_update_dynamic(instance, device)
+		if self.uses_periodic_tuning():
+			self._instance_update_dynamic(instance, device)
 
 	def _instance_unapply_dynamic(self, instance, device):
 		pass

tuned/plugins/plugin_cpu.py

@@ -217,6 +217,10 @@ def supports_static_tuning(cls):
 	def supports_dynamic_tuning(cls):
 		return True
 
+	@classmethod
+	def uses_periodic_tuning(cls):
+		return True
+
 	def _init_devices(self):
 		self._devices_supported = True
 		self._free_devices = set()

tuned/plugins/plugin_disk.py

@@ -103,6 +103,10 @@ def supports_static_tuning(cls):
 	def supports_dynamic_tuning(cls):
 		return True
 
+	@classmethod
+	def uses_periodic_tuning(cls):
+		return True
+
 	def _init_devices(self):
 		super(DiskPlugin, self)._init_devices()
 		self._devices_supported = True

tuned/plugins/plugin_eeepc_she.py

@@ -44,6 +44,10 @@ def supports_static_tuning(cls):
 	def supports_dynamic_tuning(cls):
 		return True
 
+	@classmethod
+	def uses_periodic_tuning(cls):
+		return True
+
 	@classmethod
 	def _get_config_options(self):
 		return {

tuned/plugins/plugin_net.py

@@ -167,6 +167,10 @@ def supports_static_tuning(cls):
 	def supports_dynamic_tuning(cls):
 		return True
 
+	@classmethod
+	def uses_periodic_tuning(cls):
+		return True
+
 	def _init_devices(self):
 		self._devices_supported = True
 		self._free_devices = set()