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| author | Tejun Heo <tj@kernel.org> | 2012-03-05 13:15:28 -0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2012-03-06 21:27:24 +0100 |
| commit | 4f85cb96d9d2fbbb7160db855a6beee1baced5e5 (patch) | |
| tree | 5472bba04490da05fa6ca8f780431b37bd7375cb /block/blk-cgroup.c | |
| parent | 852c788f8365062c8a383c5a93f7f7289977cb50 (diff) | |
| download | lwn-4f85cb96d9d2fbbb7160db855a6beee1baced5e5.tar.gz lwn-4f85cb96d9d2fbbb7160db855a6beee1baced5e5.zip | |
block: make block cgroup policies follow bio task association
Implement bio_blkio_cgroup() which returns the blkcg associated with
the bio if exists or %current's blkcg, and use it in blk-throttle and
cfq-iosched propio. This makes both cgroup policies honor task
association for the bio instead of always assuming %current.
As nobody is using bio_set_task() yet, this doesn't introduce any
behavior change.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-cgroup.c')
| -rw-r--r-- | block/blk-cgroup.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index 27d39a810cb6..ee962f327ba5 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -71,12 +71,19 @@ struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup) } EXPORT_SYMBOL_GPL(cgroup_to_blkio_cgroup); -struct blkio_cgroup *task_blkio_cgroup(struct task_struct *tsk) +static struct blkio_cgroup *task_blkio_cgroup(struct task_struct *tsk) { return container_of(task_subsys_state(tsk, blkio_subsys_id), struct blkio_cgroup, css); } -EXPORT_SYMBOL_GPL(task_blkio_cgroup); + +struct blkio_cgroup *bio_blkio_cgroup(struct bio *bio) +{ + if (bio && bio->bi_css) + return container_of(bio->bi_css, struct blkio_cgroup, css); + return task_blkio_cgroup(current); +} +EXPORT_SYMBOL_GPL(bio_blkio_cgroup); static inline void blkio_update_group_weight(struct blkio_group *blkg, int plid, unsigned int weight) |