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blk-throttle: Dynamically allocate root group

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Currently, we allocate root throtl_grp statically. But as we will be
introducing per cpu stat pointers and that will be allocated
dynamically even for root group, we might as well make whole root
throtl_grp allocation dynamic and treat it in same manner as other
groups.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Vivek Goyal 2011-05-19 15:38:24 -04:00 committed by Jens Axboe
parent f469a7b4d5
commit 29b125892f
1 changed files with 12 additions and 15 deletions
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27
block/blk-throttle.c
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@ -88,7 +88,7 @@ struct throtl_data
/* service tree for active throtl groups */
struct throtl_rb_root tg_service_tree;
struct throtl_grp root_tg;
struct throtl_grp *root_tg;
struct request_queue *queue;
/* Total Number of queued bios on READ and WRITE lists */
@ -233,7 +233,7 @@ throtl_grp *throtl_find_tg(struct throtl_data *td, struct blkio_cgroup *blkcg)
* Avoid lookup in this case
*/
if (blkcg == &blkio_root_cgroup)
tg = &td->root_tg;
tg = td->root_tg;
else
tg = tg_of_blkg(blkiocg_lookup_group(blkcg, key));
@ -313,7 +313,7 @@ static struct throtl_grp * throtl_get_tg(struct throtl_data *td)
/* Group allocation failed. Account the IO to root group */
if (!tg) {
tg = &td->root_tg;
tg = td->root_tg;
return tg;
}
@ -1153,18 +1153,16 @@ int blk_throtl_init(struct request_queue *q)
td->limits_changed = false;
INIT_DELAYED_WORK(&td->throtl_work, blk_throtl_work);
/* Init root group */
tg = &td->root_tg;
throtl_init_group(tg);
/* alloc and Init root group. */
td->queue = q;
tg = throtl_alloc_tg(td);
/*
* Set root group reference to 2. One reference will be dropped when
* all groups on tg_list are being deleted during queue exit. Other
* reference will remain there as we don't want to delete this group
* as it is statically allocated and gets destroyed when throtl_data
* goes away.
*/
atomic_inc(&tg->ref);
if (!tg) {
kfree(td);
return -ENOMEM;
}
td->root_tg = tg;
rcu_read_lock();
blkiocg_add_blkio_group(&blkio_root_cgroup, &tg->blkg, (void *)td,
@ -1173,7 +1171,6 @@ int blk_throtl_init(struct request_queue *q)
throtl_add_group_to_td_list(td, tg);
/* Attach throtl data to request queue */
td->queue = q;
q->td = td;
return 0;
}