Messages in this thread Patch in this message | | | From | Tejun Heo <> | Subject | [PATCH 1/4] blkcg: add blkcg->id | Date | Mon, 19 Mar 2012 15:10:56 -0700 |
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Add 64bit unique id to blkcg. This will be used by policies which want blkcg identity test to tell whether the associated blkcg has changed.
Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Vivek Goyal <vgoyal@redhat.com> --- block/blk-cgroup.c | 3 +++ block/blk-cgroup.h | 3 +++ 2 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index b15a517..30e0730 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -19,6 +19,7 @@ #include <linux/slab.h> #include <linux/genhd.h> #include <linux/delay.h> +#include <linux/atomic.h> #include "blk-cgroup.h" #include "blk.h" @@ -1622,6 +1623,7 @@ static void blkiocg_destroy(struct cgroup_subsys *subsys, struct cgroup *cgroup) static struct cgroup_subsys_state * blkiocg_create(struct cgroup_subsys *subsys, struct cgroup *cgroup) { + static atomic64_t id_seq = ATOMIC64_INIT(0); struct blkio_cgroup *blkcg; struct cgroup *parent = cgroup->parent; @@ -1635,6 +1637,7 @@ blkiocg_create(struct cgroup_subsys *subsys, struct cgroup *cgroup) return ERR_PTR(-ENOMEM); blkcg->weight = BLKIO_WEIGHT_DEFAULT; + blkcg->id = atomic64_inc_return(&id_seq); /* root is 0, start from 1 */ done: spin_lock_init(&blkcg->lock); INIT_HLIST_HEAD(&blkcg->blkg_list); diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h index 9df5ab0..1cb8f76 100644 --- a/block/blk-cgroup.h +++ b/block/blk-cgroup.h @@ -116,6 +116,9 @@ struct blkio_cgroup { unsigned int weight; spinlock_t lock; struct hlist_head blkg_list; + + /* for policies to test whether associated blkcg has changed */ + uint64_t id; }; struct blkio_group_stats { -- 1.7.7.3
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