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authorGui Jianfeng <guijianfeng@cn.fujitsu.com>2010-04-13 04:05:49 -0400
committerJens Axboe <jens.axboe@oracle.com>2010-04-13 04:14:20 -0400
commit34d0f179d6dd711d3fc13c0820a456c59aae8048 (patch)
tree0e3d533e16cd7d99b0d28ec13353862f1da96dfd /block/cfq-iosched.c
parent812df48d127365ffd0869aa139738f572a86759c (diff)
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/cfq-iosched.c')
-rw-r--r--block/cfq-iosched.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index b6e095c7ef5e..91af2f2e59ce 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -952,7 +952,6 @@ cfq_find_alloc_cfqg(struct cfq_data *cfqd, struct cgroup *cgroup, int create)
952 if (!cfqg) 952 if (!cfqg)
953 goto done; 953 goto done;
954 954
955 cfqg->weight = blkcg->weight;
956 for_each_cfqg_st(cfqg, i, j, st) 955 for_each_cfqg_st(cfqg, i, j, st)
957 *st = CFQ_RB_ROOT; 956 *st = CFQ_RB_ROOT;
958 RB_CLEAR_NODE(&cfqg->rb_node); 957 RB_CLEAR_NODE(&cfqg->rb_node);
@@ -970,6 +969,7 @@ cfq_find_alloc_cfqg(struct cfq_data *cfqd, struct cgroup *cgroup, int create)
970 sscanf(dev_name(bdi->dev), "%u:%u", &major, &minor); 969 sscanf(dev_name(bdi->dev), "%u:%u", &major, &minor);
971 blkiocg_add_blkio_group(blkcg, &cfqg->blkg, (void *)cfqd, 970 blkiocg_add_blkio_group(blkcg, &cfqg->blkg, (void *)cfqd,
972 MKDEV(major, minor)); 971 MKDEV(major, minor));
972 cfqg->weight = blkcg_get_weight(blkcg, cfqg->blkg.dev);
973 973
974 /* Add group on cfqd list */ 974 /* Add group on cfqd list */
975 hlist_add_head(&cfqg->cfqd_node, &cfqd->cfqg_list); 975 hlist_add_head(&cfqg->cfqd_node, &cfqd->cfqg_list);