Messages in this thread | | | Date | Mon, 21 Dec 2009 11:28:50 -0500 | From | Vivek Goyal <> | Subject | Re: [PATCH] cfq: Remove useless css reference get |
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On Wed, Dec 16, 2009 at 04:38:43PM +0800, Gui Jianfeng wrote: > There's no need to take css reference here, for the caller > has already called rcu_read_lock() to prevent cgroup from > being removed. > > Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com> > Reviewed-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Thanks Vivek
> --- > block/blk-cgroup.c | 14 -------------- > block/blk-cgroup.h | 3 --- > block/cfq-iosched.c | 5 ----- > 3 files changed, 0 insertions(+), 22 deletions(-) > > diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c > index 1fa2654..cba28f4 100644 > --- a/block/blk-cgroup.c > +++ b/block/blk-cgroup.c > @@ -23,20 +23,6 @@ static LIST_HEAD(blkio_list); > struct blkio_cgroup blkio_root_cgroup = { .weight = 2*BLKIO_WEIGHT_DEFAULT }; > EXPORT_SYMBOL_GPL(blkio_root_cgroup); > > -bool blkiocg_css_tryget(struct blkio_cgroup *blkcg) > -{ > - if (!css_tryget(&blkcg->css)) > - return false; > - return true; > -} > -EXPORT_SYMBOL_GPL(blkiocg_css_tryget); > - > -void blkiocg_css_put(struct blkio_cgroup *blkcg) > -{ > - css_put(&blkcg->css); > -} > -EXPORT_SYMBOL_GPL(blkiocg_css_put); > - > struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup) > { > return container_of(cgroup_subsys_state(cgroup, blkio_subsys_id), > diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h > index 4d316df..84bf745 100644 > --- a/block/blk-cgroup.h > +++ b/block/blk-cgroup.h > @@ -43,9 +43,6 @@ struct blkio_group { > unsigned long sectors; > }; > > -extern bool blkiocg_css_tryget(struct blkio_cgroup *blkcg); > -extern void blkiocg_css_put(struct blkio_cgroup *blkcg); > - > typedef void (blkio_unlink_group_fn) (void *key, struct blkio_group *blkg); > typedef void (blkio_update_group_weight_fn) (struct blkio_group *blkg, > unsigned int weight); > diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c > index e2f8046..5d6b427 100644 > --- a/block/cfq-iosched.c > +++ b/block/cfq-iosched.c > @@ -958,10 +958,6 @@ cfq_find_alloc_cfqg(struct cfq_data *cfqd, struct cgroup *cgroup, int create) > struct backing_dev_info *bdi = &cfqd->queue->backing_dev_info; > unsigned int major, minor; > > - /* Do we need to take this reference */ > - if (!blkiocg_css_tryget(blkcg)) > - return NULL;; > - > cfqg = cfqg_of_blkg(blkiocg_lookup_group(blkcg, key)); > if (cfqg || !create) > goto done; > @@ -992,7 +988,6 @@ cfq_find_alloc_cfqg(struct cfq_data *cfqd, struct cgroup *cgroup, int create) > hlist_add_head(&cfqg->cfqd_node, &cfqd->cfqg_list); > > done: > - blkiocg_css_put(blkcg); > return cfqg; > } > > -- > 1.5.4.rc3 >
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