From 34d0f179d6dd711d3fc13c0820a456c59aae8048 Mon Sep 17 00:00:00 2001 From: Gui Jianfeng Date: Tue, 13 Apr 2010 16:05:49 +0800 Subject: 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 Acked-by: Vivek Goyal Signed-off-by: Jens Axboe --- block/blk-cgroup.h | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'block/blk-cgroup.h') diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h index bfce085b1962..3c27bdfc97b9 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); -- cgit v1.2.3