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-rw-r--r--Documentation/cgroups/blkio-controller.txt24
1 files changed, 6 insertions, 18 deletions
diff --git a/Documentation/cgroups/blkio-controller.txt b/Documentation/cgroups/blkio-controller.txt
index 68b6a6a47..12686bec3 100644
--- a/Documentation/cgroups/blkio-controller.txt
+++ b/Documentation/cgroups/blkio-controller.txt
@@ -201,7 +201,7 @@ Proportional weight policy files
specifies the number of bytes.
- blkio.io_serviced
- - Number of IOs completed to/from the disk by the group. These
+ - Number of IOs (bio) issued to the disk by the group. These
are further divided by the type of operation - read or write, sync
or async. First two fields specify the major and minor number of the
device, third field specifies the operation type and the fourth field
@@ -327,18 +327,11 @@ Note: If both BW and IOPS rules are specified for a device, then IO is
subjected to both the constraints.
- blkio.throttle.io_serviced
- - Number of IOs (bio) completed to/from the disk by the group (as
- seen by throttling policy). These are further divided by the type
- of operation - read or write, sync or async. First two fields specify
- the major and minor number of the device, third field specifies the
- operation type and the fourth field specifies the number of IOs.
-
- blkio.io_serviced does accounting as seen by CFQ and counts are in
- number of requests (struct request). On the other hand,
- blkio.throttle.io_serviced counts number of IO in terms of number
- of bios as seen by throttling policy. These bios can later be
- merged by elevator and total number of requests completed can be
- lesser.
+ - Number of IOs (bio) issued to the disk by the group. These
+ are further divided by the type of operation - read or write, sync
+ or async. First two fields specify the major and minor number of the
+ device, third field specifies the operation type and the fourth field
+ specifies the number of IOs.
- blkio.throttle.io_service_bytes
- Number of bytes transferred to/from the disk by the group. These
@@ -347,11 +340,6 @@ Note: If both BW and IOPS rules are specified for a device, then IO is
device, third field specifies the operation type and the fourth field
specifies the number of bytes.
- These numbers should roughly be same as blkio.io_service_bytes as
- updated by CFQ. The difference between two is that
- blkio.io_service_bytes will not be updated if CFQ is not operating
- on request queue.
-
Common files among various policies
-----------------------------------
- blkio.reset_stats