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cfq-iosched: Get rid of st->active 

When a cfq group is running, it won't be dequeued from service tree, so
there's no need to store the active one in st->active. Just gid rid of it.

Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
wifi-calibration
Gui Jianfeng 2010-11-30 20:52:46 +01:00 committed by Jens Axboe
parent f30195c502
commit b54ce60eb7
1 changed files with 1 additions and 14 deletions
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15
block/cfq-iosched.c
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@ -87,7 +87,6 @@ struct cfq_rb_root {
unsigned count;
unsigned total_weight;
u64 min_vdisktime;
struct rb_node *active;
};
#define CFQ_RB_ROOT (struct cfq_rb_root) { .rb = RB_ROOT, .left = NULL, \
.count = 0, .min_vdisktime = 0, }
@ -563,11 +562,6 @@ static void update_min_vdisktime(struct cfq_rb_root *st)
u64 vdisktime = st->min_vdisktime;
struct cfq_group *cfqg;
if (st->active) {
cfqg = rb_entry_cfqg(st->active);
vdisktime = cfqg->vdisktime;
}
if (st->left) {
cfqg = rb_entry_cfqg(st->left);
vdisktime = min_vdisktime(vdisktime, cfqg->vdisktime);
@ -894,9 +888,6 @@ cfq_group_service_tree_del(struct cfq_data *cfqd, struct cfq_group *cfqg)
{
struct cfq_rb_root *st = &cfqd->grp_service_tree;
if (st->active == &cfqg->rb_node)
st->active = NULL;
BUG_ON(cfqg->nr_cfqq < 1);
cfqg->nr_cfqq--;
@ -1095,7 +1086,7 @@ static void cfq_put_cfqg(struct cfq_group *cfqg)
if (!atomic_dec_and_test(&cfqg->ref))
return;
for_each_cfqg_st(cfqg, i, j, st)
BUG_ON(!RB_EMPTY_ROOT(&st->rb) || st->active != NULL);
BUG_ON(!RB_EMPTY_ROOT(&st->rb));
kfree(cfqg);
}
@ -1687,9 +1678,6 @@ __cfq_slice_expired(struct cfq_data *cfqd, struct cfq_queue *cfqq,
if (cfqq == cfqd->active_queue)
cfqd->active_queue = NULL;
if (&cfqq->cfqg->rb_node == cfqd->grp_service_tree.active)
cfqd->grp_service_tree.active = NULL;
if (cfqd->active_cic) {
put_io_context(cfqd->active_cic->ioc);
cfqd->active_cic = NULL;
@ -2199,7 +2187,6 @@ static struct cfq_group *cfq_get_next_cfqg(struct cfq_data *cfqd)
if (RB_EMPTY_ROOT(&st->rb))
return NULL;
cfqg = cfq_rb_first_group(st);
st->active = &cfqg->rb_node;
update_min_vdisktime(st);
return cfqg;
}