blk-cgroup: Lower minimum weight from 100 to 10.

We've found that we still get good, useful isolation at weights this
low. I'd like to adjust the minimum so that any other changes can take
these values into account.

Signed-off-by: Justin TerAvest <teravest@google.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

diff --git a/Documentation/cgroups/blkio-controller.txt b/Documentation/cgroups/blkio-controller.txt
index d915c16df42c105d7a7dbc75d590380c815ecace..465351d4cf853e8a308c9c84abef789b3dcfa42c 100644 (file)
--- a/Documentation/cgroups/blkio-controller.txt
+++ b/Documentation/cgroups/blkio-controller.txt
@@ -140,7 +140,7 @@ Proportional weight policy files
        - Specifies per cgroup weight. This is default weight of the group
          on all the devices until and unless overridden by per device rule.
          (See blkio.weight_device).
-         Currently allowed range of weights is from 100 to 1000.
+         Currently allowed range of weights is from 10 to 1000.
 
 - blkio.weight_device
        - One can specify per cgroup per device rules using this interface.

diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index ea4861bdd549a58fb3884eab94c1c2395bae243a..57e7234c5ae5b34352ceb353efc1b27a35df0f5a 100644 (file)
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -240,7 +240,7 @@ static inline char *blkg_path(struct blkio_group *blkg) { return NULL; }
 
 #endif
 
-#define BLKIO_WEIGHT_MIN       100
+#define BLKIO_WEIGHT_MIN       10
 #define BLKIO_WEIGHT_MAX       1000
 #define BLKIO_WEIGHT_DEFAULT   500