block: improve ioprio class description comment

[linux-2.6-microblaze.git] / include / uapi / linux / ioprio.h

diff --git a/include/uapi/linux/ioprio.h b/include/uapi/linux/ioprio.h
index 77b17e0..6b73585 100644 (file)
--- a/include/uapi/linux/ioprio.h
+++ b/include/uapi/linux/ioprio.h
@@ -13,10 +13,12 @@
 #define IOPRIO_PRIO_VALUE(class, data) (((class) << IOPRIO_CLASS_SHIFT) | data)
 
 /*
- * These are the io priority groups as implemented by CFQ. RT is the realtime
- * class, it always gets premium service. BE is the best-effort scheduling
- * class, the default for any process. IDLE is the idle scheduling class, it
- * is only served when no one else is using the disk.
+ * These are the io priority groups as implemented by the BFQ and mq-deadline
+ * schedulers. RT is the realtime class, it always gets premium service. For
+ * ATA disks supporting NCQ IO priority, RT class IOs will be processed using
+ * high priority NCQ commands. BE is the best-effort scheduling class, the
+ * default for any process. IDLE is the idle scheduling class, it is only
+ * served when no one else is using the disk.
  */
 enum {
        IOPRIO_CLASS_NONE,