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authorGui Jianfeng <guijianfeng@cn.fujitsu.com>2010-04-13 16:05:49 +0800
committerJens Axboe <jens.axboe@oracle.com>2010-04-13 10:14:20 +0200
commit34d0f179d6dd711d3fc13c0820a456c59aae8048 (patch)
tree0e3d533e16cd7d99b0d28ec13353862f1da96dfd /block/blk-cgroup.h
parent812df48d127365ffd0869aa139738f572a86759c (diff)
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io-controller: Add a new interface "weight_device" for IO-Controller
Currently, IO Controller makes use of blkio.weight to assign weight for all devices. Here a new user interface "blkio.weight_device" is introduced to assign different weights for different devices. blkio.weight becomes the default value for devices which are not configured by "blkio.weight_device" You can use the following format to assigned specific weight for a given device: #echo "major:minor weight" > blkio.weight_device major:minor represents device number. And you can remove weight for a given device as following: #echo "major:minor 0" > blkio.weight_device V1->V2 changes: - use user interface "weight_device" instead of "policy" suggested by Vivek - rename some struct suggested by Vivek - rebase to 2.6-block "for-linus" branch - remove an useless list_empty check pointed out by Li Zefan - some trivial typo fix V2->V3 changes: - Move policy_*_node() functions up to get rid of forward declarations - rename related functions by adding prefix "blkio_" Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com> Acked-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/blk-cgroup.h')
-rw-r--r--block/blk-cgroup.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index bfce085b196..3c27bdfc97b 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -70,6 +70,7 @@ struct blkio_cgroup {
unsigned int weight;
spinlock_t lock;
struct hlist_head blkg_list;
+ struct list_head policy_list; /* list of blkio_policy_node */
};
struct blkio_group_stats {
@@ -119,6 +120,15 @@ struct blkio_group {
struct blkio_group_stats stats;
};
+struct blkio_policy_node {
+ struct list_head node;
+ dev_t dev;
+ unsigned int weight;
+};
+
+extern unsigned int blkcg_get_weight(struct blkio_cgroup *blkcg,
+ dev_t dev);
+
typedef void (blkio_unlink_group_fn) (void *key, struct blkio_group *blkg);
typedef void (blkio_update_group_weight_fn) (struct blkio_group *blkg,
unsigned int weight);