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From: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
To: Vivek Goyal <vgoyal@redhat.com>, Jens Axboe <axboe@kernel.dk>
Cc: Gui Jianfeng <guijianfeng@cn.fujitsu.com>,
	linux kernel mailing list <linux-kernel@vger.kernel.org>,
	Corrado Zoccolo <czoccolo@gmail.com>,
	Chad Talbott <ctalbott@google.com>,
	Nauman Rafique <nauman@google.com>,
	Divyesh Shah <dpshah@google.com>,
	jmoyer@redhat.com, Shaohua Li <shaohua.li@intel.com>
Subject: [PATCH 4/6 v3] cfq-iosched: Extract some common code of service tree handling for CFQ queue and CFQ group
Date: Mon, 27 Dec 2010 16:51:10 +0800	[thread overview]
Message-ID: <4D18537E.2090401@cn.fujitsu.com> (raw)
In-Reply-To: <4D180ECE.4000305@cn.fujitsu.com>

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@cn.fujitsu.com>
---
 block/cfq-iosched.c |   86 +++++++++++++++++++++-----------------------------
 1 files changed, 36 insertions(+), 50 deletions(-)

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index b598798..1f21418 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -865,12 +865,11 @@ 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;
 
@@ -894,6 +893,14 @@ __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;
@@ -917,8 +924,23 @@ 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
@@ -935,9 +957,7 @@ 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);
 }
@@ -986,9 +1006,9 @@ 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)) {
@@ -1225,13 +1245,11 @@ 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;
@@ -1248,8 +1266,7 @@ 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;
@@ -1265,8 +1282,7 @@ 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;
@@ -1312,8 +1328,7 @@ 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;
 
@@ -1338,38 +1353,11 @@ 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;
-	}
 
-	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);
+	/* Add cfqq onto service tree. */
+	cfq_entity_service_tree_add(service_tree, cfqe);
 	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;
@@ -1482,9 +1470,7 @@ 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








  parent reply	other threads:[~2010-12-27  8:51 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <4D180ECE.4000305@cn.fujitsu.com>
2010-12-27  8:50 ` [PATCH 1/6 v3] cfq-iosched: Introduce cfq_entity for CFQ queue Gui Jianfeng
2010-12-27  8:50 ` [PATCH 2/6 v3] cfq-iosched: Introduce cfq_entity for CFQ group Gui Jianfeng
2011-01-18 21:20   ` Vivek Goyal
2011-01-19  1:25     ` Gui Jianfeng
2011-01-23  2:15     ` Gui Jianfeng
2010-12-27  8:51 ` [PATCH 3/6 v3] cfq-iosched: Introduce vdisktime and io weight for CFQ queue Gui Jianfeng
2010-12-28  2:50   ` Shaohua Li
2010-12-28  3:59     ` Gui Jianfeng
2010-12-28  6:03       ` Shaohua Li
2010-12-28  6:59         ` Gui Jianfeng
2011-01-19 22:58   ` Vivek Goyal
2011-01-20  3:58     ` Gui Jianfeng
2011-01-20 11:09       ` Vivek Goyal
2011-01-24  4:45         ` Gui Jianfeng
2011-01-24 18:51           ` Vivek Goyal
2010-12-27  8:51 ` Gui Jianfeng [this message]
2010-12-27  8:51 ` [PATCH 5/6 v3] cfq-iosched: CFQ group hierarchical scheduling and use_hierarchy interface Gui Jianfeng
2011-01-24 22:52   ` Vivek Goyal
2010-12-27  8:51 ` [PATCH 6/6 v3] blkio-cgroup: Document for blkio.use_hierarchy interface Gui Jianfeng
2011-01-18 20:27   ` Vivek Goyal
2011-01-19  1:20     ` Gui Jianfeng

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