diff options
| author | Vivek Goyal <vgoyal@redhat.com> | 2010-10-01 14:49:48 +0200 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2010-10-01 14:49:48 +0200 |
| commit | 02977e4af7ed3b478c505e50491ffdf3e1314cf4 (patch) | |
| tree | 5adb947a5c8567cbbff79459e9feaccf354fd81f /block/blk-throttle.c | |
| parent | blkio: deletion of a cgroup was causes oops (diff) | |
| download | linux-02977e4af7ed3b478c505e50491ffdf3e1314cf4.tar.xz linux-02977e4af7ed3b478c505e50491ffdf3e1314cf4.zip | |
blkio: Add root group to td->tg_list
o Currently all the dynamically allocated groups, except root grp is added
to td->tg_list. This was not a problem so far but in next patch I will
travel through td->tg_list to process any updates of limits on the group.
If root group is not in tg_list, then root group's updates are not
processed.
o It is better to root group also to tg_list instead of doing special
processing for it during limit updates.
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'block/blk-throttle.c')
| -rw-r--r-- | block/blk-throttle.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c index af53f37c1b13..bc2936b80add 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -87,7 +87,7 @@ struct throtl_data unsigned int nr_queued[2]; /* - * number of total undestroyed groups (excluding root group) + * number of total undestroyed groups */ unsigned int nr_undestroyed_grps; @@ -940,7 +940,17 @@ int blk_throtl_init(struct request_queue *q) /* Practically unlimited BW */ tg->bps[0] = tg->bps[1] = -1; tg->iops[0] = tg->iops[1] = -1; - atomic_set(&tg->ref, 1); + + /* + * 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_set(&tg->ref, 2); + hlist_add_head(&tg->tg_node, &td->tg_list); + td->nr_undestroyed_grps++; INIT_DELAYED_WORK(&td->throtl_work, blk_throtl_work); @@ -966,10 +976,9 @@ void blk_throtl_exit(struct request_queue *q) spin_lock_irq(q->queue_lock); throtl_release_tgs(td); - blkiocg_del_blkio_group(&td->root_tg.blkg); /* If there are other groups */ - if (td->nr_undestroyed_grps >= 1) + if (td->nr_undestroyed_grps > 0) wait = true; spin_unlock_irq(q->queue_lock); |