daemon-config: Add ioprio configuration option

Signed-off-by: Kai Krakow <kai@kaishome.de>

daemon/daemon_config.c

@@ -70,6 +70,8 @@ struct GameModeConfig {
 	char softrealtime[CONFIG_VALUE_MAX];
 	long renice;
 
+	char ioprio[CONFIG_VALUE_MAX];
+
 	long reaper_frequency;
 };
 
@@ -164,6 +166,8 @@ static int inih_handler(void *user, const char *section, const char *name, const
 			valid = get_string_value(value, self->softrealtime);
 		} else if (strcmp(name, "renice") == 0) {
 			valid = get_long_value(name, value, &self->renice);
+		} else if (strcmp(name, "ioprio") == 0) {
+			valid = get_string_value(value, self->ioprio);
 		}
 	} else if (strcmp(section, "custom") == 0) {
 		/* Custom subsection */
@@ -215,6 +219,7 @@ static void load_config_files(GameModeConfig *self)
 	pthread_rwlock_wrlock(&self->rwlock);
 
 	/* Clear our config values */
+	memset(self->ioprio, 0, sizeof(self->ioprio));
 	memset(self->whitelist, 0, sizeof(self->whitelist));
 	memset(self->blacklist, 0, sizeof(self->blacklist));
 	memset(self->startscripts, 0, sizeof(self->startscripts));
@@ -424,3 +429,18 @@ void config_get_renice_value(GameModeConfig *self, long *value)
 {
 	memcpy_locked_config(self, value, &self->renice, sizeof(long));
 }
+
+/*
+ * Get the ioprio value
+ */
+void config_get_ioprio_value(GameModeConfig *self, int *value)
+{
+	char ioprio_value[CONFIG_VALUE_MAX] = { 0 };
+	memcpy_locked_config(self, ioprio_value, &self->ioprio, sizeof(self->ioprio));
+	if (0 == strncmp(ioprio_value, "off", sizeof(self->ioprio)))
+		*value = IOPRIO_DONT_SET;
+	else if (0 == strncmp(ioprio_value, "default", sizeof(self->ioprio)))
+		*value = IOPRIO_RESET_DEFAULT;
+	else
+		*value = atoi(ioprio_value);
+}

daemon/daemon_config.h

@@ -39,6 +39,12 @@ POSSIBILITY OF SUCH DAMAGE.
 #define CONFIG_LIST_MAX 32
 #define CONFIG_VALUE_MAX 256
 
+/*
+ * Special ioprio values
+ */
+#define IOPRIO_RESET_DEFAULT -1
+#define IOPRIO_DONT_SET -2
+
 /*
  * Opaque config context type
  */
@@ -113,3 +119,8 @@ void config_get_soft_realtime(GameModeConfig *self, char softrealtime[CONFIG_VAL
  * Get the renice value
  */
 void config_get_renice_value(GameModeConfig *self, long *value);
+
+/*
+ * Get the ioprio value
+ */
+void config_get_ioprio_value(GameModeConfig *self, int *value);

data/gamemoded.8

@@ -110,6 +110,12 @@ softrealtime=auto
 ; the value will be negated and applied as a nice value
 renice = 4
 
+; By default, GameMode adjusts the iopriority of clients to BE/0, you can put any value
+; between 0 and 7 here (with 0 being highest priority), or one of the special values
+; "off" (to disable) or "reset" (to restore Linux default behavior based on CPU priority),
+; currently, only the best-effort class is supported thus you cannot set it here
+ioprio = 0
+
 [filter]
 ; If "whitelist" entry has a value(s)
 ; gamemode will reject anything not in the whitelist

example/gamemode.ini

@@ -15,6 +15,12 @@ softrealtime=auto
 ; the value will be negated and applied as a nice value
 renice = 4
 
+; By default, GameMode adjusts the iopriority of clients to BE/0, you can put any value
+; between 0 and 7 here (with 0 being highest priority), or one of the special values
+; "off" (to disable) or "reset" (to restore Linux default behavior based on CPU priority),
+; currently, only the best-effort class is supported thus you cannot set it here
+ioprio = 0
+
 [filter]
 ; If "whitelist" entry has a value(s)
 ; gamemode will reject anything not in the whitelist