blkio: Add io_queued and avg_queue_size stats

[safe/jmp/linux-2.6] / Documentation / cgroups / blkio-controller.txt

diff --git a/Documentation/cgroups/blkio-controller.txt b/Documentation/cgroups/blkio-controller.txt
index 810e301..6e52e7c 100644 (file)
--- a/Documentation/cgroups/blkio-controller.txt
+++ b/Documentation/cgroups/blkio-controller.txt
@@ -139,6 +139,17 @@ Details of cgroup files
          cgroup. This is further divided by the type of operation - read or
          write, sync or async.
 
+- blkio.io_queued
+       - Total number of requests queued up at any given instant for this
+         cgroup. This is further divided by the type of operation - read or
+         write, sync or async.
+
+- blkio.avg_queue_size
+       - Debugging aid only enabled if CONFIG_DEBUG_CFQ_IOSCHED=y.
+         The average queue size for this cgroup over the entire time of this
+         cgroup's existence. Queue size samples are taken each time one of the
+         queues of this cgroup gets a timeslice.
+
 - blkio.dequeue
        - Debugging aid only enabled if CONFIG_DEBUG_CFQ_IOSCHED=y. This
          gives the statistics about how many a times a group was dequeued