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SubjectRe: [PATCH] cfq: Remove useless css reference get
Vivek Goyal wrote:
> 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>

Hi Jens

Would you pick this patch up?

>
> 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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