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Date: Mon, 13 Dec 2010 09:44:54 +0800
From: Gui Jianfeng <guijianfeng@...fujitsu.com>
To: Jens Axboe <axboe@...nel.dk>, Vivek Goyal <vgoyal@...hat.com>
CC: Gui Jianfeng <guijianfeng@...fujitsu.com>,
Corrado Zoccolo <czoccolo@...il.com>,
Chad Talbott <ctalbott@...gle.com>,
Nauman Rafique <nauman@...gle.com>,
Divyesh Shah <dpshah@...gle.com>,
linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: [PATCH 4/8 v2] cfq-iosched: Extract some common code of service tree
handling for CFQ queue and CFQ group.
Extract some common code of service tree handling for CFQ queue and
CFQ group. This helps when CFQ queue and CFQ group are scheduling
together.
Signed-off-by: Gui Jianfeng <guijianfeng@...fujitsu.com>
---
block/cfq-iosched.c | 87 +++++++++++++++++++++------------------------------
1 files changed, 36 insertions(+), 51 deletions(-)
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 30d19c0..6486956 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -863,12 +863,11 @@ entity_key(struct cfq_rb_root *st, struct cfq_entity *entity)
}
static void
-__cfq_group_service_tree_add(struct cfq_rb_root *st, struct cfq_group *cfqg)
+__cfq_entity_service_tree_add(struct cfq_rb_root *st, struct cfq_entity *cfqe)
{
struct rb_node **node = &st->rb.rb_node;
struct rb_node *parent = NULL;
struct cfq_entity *__cfqe;
- struct cfq_entity *cfqe = &cfqg->cfqe;
s64 key = entity_key(st, cfqe);
int left = 1;
@@ -892,6 +891,14 @@ __cfq_group_service_tree_add(struct cfq_rb_root *st, struct cfq_group *cfqg)
}
static void
+cfq_entity_service_tree_add(struct cfq_rb_root *st, struct cfq_entity *cfqe)
+{
+ __cfq_entity_service_tree_add(st, cfqe);
+ st->count++;
+ st->total_weight += cfqe->weight;
+}
+
+static void
cfq_group_service_tree_add(struct cfq_data *cfqd, struct cfq_group *cfqg)
{
struct cfq_rb_root *st = &cfqd->grp_service_tree;
@@ -915,8 +922,23 @@ cfq_group_service_tree_add(struct cfq_data *cfqd, struct cfq_group *cfqg)
} else
cfqe->vdisktime = st->min_vdisktime;
- __cfq_group_service_tree_add(st, cfqg);
- st->total_weight += cfqe->weight;
+ cfq_entity_service_tree_add(st, cfqe);
+}
+
+static void
+__cfq_entity_service_tree_del(struct cfq_rb_root *st, struct cfq_entity *cfqe)
+{
+ cfq_rb_erase(&cfqe->rb_node, st);
+}
+
+static void
+cfq_entity_service_tree_del(struct cfq_rb_root *st, struct cfq_entity *cfqe)
+{
+ if (!RB_EMPTY_NODE(&cfqe->rb_node)) {
+ __cfq_entity_service_tree_del(st, cfqe);
+ st->total_weight -= cfqe->weight;
+ cfqe->service_tree = NULL;
+ }
}
static void
@@ -933,9 +955,7 @@ cfq_group_service_tree_del(struct cfq_data *cfqd, struct cfq_group *cfqg)
return;
cfq_log_cfqg(cfqd, cfqg, "del_from_rr group");
- st->total_weight -= cfqe->weight;
- if (!RB_EMPTY_NODE(&cfqe->rb_node))
- cfq_rb_erase(&cfqe->rb_node, st);
+ cfq_entity_service_tree_del(st, cfqe);
cfqg->saved_workload_slice = 0;
cfq_blkiocg_update_dequeue_stats(&cfqg->blkg, 1);
}
@@ -984,9 +1004,9 @@ static void cfq_group_served(struct cfq_data *cfqd, struct cfq_group *cfqg,
charge = cfqq->allocated_slice;
/* Can't update vdisktime while group is on service tree */
- cfq_rb_erase(&cfqe->rb_node, st);
+ __cfq_entity_service_tree_del(st, cfqe);
cfqe->vdisktime += cfq_scale_slice(charge, cfqe);
- __cfq_group_service_tree_add(st, cfqg);
+ __cfq_entity_service_tree_add(st, cfqe);
/* This group is being expired. Save the context */
if (time_after(cfqd->workload_expires, jiffies)) {
@@ -1223,13 +1243,11 @@ static void cfq_service_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq,
bool add_front)
{
struct cfq_entity *cfqe;
- struct rb_node **p, *parent;
+ struct rb_node *parent;
struct cfq_entity *__cfqe;
struct cfq_rb_root *service_tree, *orig_st;
- int left;
int new_cfqq = 1;
int group_changed = 0;
- s64 key;
cfqe = &cfqq->cfqe;
orig_st = cfqe->service_tree;
@@ -1246,8 +1264,7 @@ static void cfq_service_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq,
* Group changed, dequeue this CFQ queue from the
* original service tree.
*/
- cfq_rb_erase(&cfqe->rb_node, cfqe->service_tree);
- orig_st->total_weight -= cfqe->weight;
+ cfq_entity_service_tree_del(orig_st, cfqe);
}
cfqq->orig_cfqg = cfqq->cfqg;
cfqq->cfqg = &cfqd->root_group;
@@ -1263,8 +1280,7 @@ static void cfq_service_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq,
* Group changed, dequeue this CFQ queue from the
* original service tree.
*/
- cfq_rb_erase(&cfqe->rb_node, cfqe->service_tree);
- orig_st->total_weight -= cfqe->weight;
+ cfq_entity_service_tree_del(orig_st, cfqe);
}
cfq_put_cfqg(cfqq->cfqg);
cfqq->cfqg = cfqq->orig_cfqg;
@@ -1310,8 +1326,7 @@ static void cfq_service_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq,
* Ok, we get here, this CFQ queue is on the service tree, dequeue it
* firstly.
*/
- cfq_rb_erase(&cfqe->rb_node, cfqe->service_tree);
- orig_st->total_weight -= cfqe->weight;
+ cfq_entity_service_tree_del(orig_st, cfqe);
new_cfqq = 0;
@@ -1338,39 +1353,12 @@ static void cfq_service_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq,
}
insert:
- left = 1;
- parent = NULL;
cfqe->service_tree = service_tree;
- p = &service_tree->rb.rb_node;
- key = entity_key(service_tree, cfqe);
- while (*p) {
- struct rb_node **n;
-
- parent = *p;
- __cfqe = rb_entry(parent, struct cfq_entity,
- rb_node);
-
- /*
- * sort by key, that represents service time.
- */
- if (key < entity_key(service_tree, __cfqe))
- n = &(*p)->rb_left;
- else {
- n = &(*p)->rb_right;
- left = 0;
- }
- p = n;
- }
+ /* Add cfqq onto service tree. */
+ cfq_entity_service_tree_add(service_tree, cfqe);
- if (left)
- service_tree->left = &cfqe->rb_node;
-
- rb_link_node(&cfqe->rb_node, parent, p);
- rb_insert_color(&cfqe->rb_node, &service_tree->rb);
update_min_vdisktime(service_tree);
- service_tree->count++;
- service_tree->total_weight += cfqe->weight;
cfqq->reposition_time = jiffies;
if ((add_front || !new_cfqq) && !group_changed)
return;
@@ -1483,10 +1471,7 @@ static void cfq_del_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq)
service_tree = cfqe->service_tree;
if (!RB_EMPTY_NODE(&cfqe->rb_node)) {
- cfq_rb_erase(&cfqe->rb_node,
- cfqe->service_tree);
- service_tree->total_weight -= cfqe->weight;
- cfqe->service_tree = NULL;
+ cfq_entity_service_tree_del(service_tree, cfqe);
}
if (cfqq->p_root) {
rb_erase(&cfqq->p_node, cfqq->p_root);
--
1.6.5.2
--
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