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cfq-iosched: Get rid of on_st flag 

It's able to check whether a CFQ group on a service tree by
checking "cfqg->rb_node". There's no need to maintain an
extra flag here.

Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Gui Jianfeng 2010-11-30 20:52:47 +01:00 committed by Jens Axboe
parent b54ce60eb7
commit 760701bfe1
1 changed files with 1 additions and 4 deletions
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5
block/cfq-iosched.c
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@ -179,7 +179,6 @@ struct cfq_group {
/* group service_tree key */
u64 vdisktime;
unsigned int weight;
bool on_st;
/* number of cfqq currently on this group */
int nr_cfqq;
@ -863,7 +862,7 @@ cfq_group_service_tree_add(struct cfq_data *cfqd, struct cfq_group *cfqg)
struct rb_node *n;
cfqg->nr_cfqq++;
if (cfqg->on_st)
if (!RB_EMPTY_NODE(&cfqg->rb_node))
return;
/*
@ -879,7 +878,6 @@ cfq_group_service_tree_add(struct cfq_data *cfqd, struct cfq_group *cfqg)
cfqg->vdisktime = st->min_vdisktime;
__cfq_group_service_tree_add(st, cfqg);
cfqg->on_st = true;
st->total_weight += cfqg->weight;
}
@ -896,7 +894,6 @@ cfq_group_service_tree_del(struct cfq_data *cfqd, struct cfq_group *cfqg)
return;
cfq_log_cfqg(cfqd, cfqg, "del_from_rr group");
cfqg->on_st = false;
st->total_weight -= cfqg->weight;
if (!RB_EMPTY_NODE(&cfqg->rb_node))
cfq_rb_erase(&cfqg->rb_node, st);