blkio: Add io_merged stat

[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 ed04fe9..810e301 100644 (file)
--- a/Documentation/cgroups/blkio-controller.txt
+++ b/Documentation/cgroups/blkio-controller.txt
@@ -134,6 +134,11 @@ Details of cgroup files
          minor number of the device, third field specifies the operation type
          and the fourth field specifies the io_wait_time in ns.
 
+- blkio.io_merged
+       - Total number of bios/requests merged into requests belonging to this
+         cgroup. This is further divided by the type of operation - read or
+         write, sync or async.
+
 - 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