Commit 8184f93e authored by Justin TerAvest's avatar Justin TerAvest Committed by Jens Axboe
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cfq-iosched: Don't update group weights when on service tree 



Version 3 is updated to apply to for-2.6.39/core.

For version 2, I took Vivek's advice and made sure we update the group
weight from cfq_group_service_tree_add().

If a weight was updated while a group is on the service tree, the
calculation for the total weight of the service tree can be adjusted
improperly, which either leads to bad service tree weights, or
potentially crashes (if total_weight becomes 0).

This patch defers updates to the weight until a group is off the service
tree.

Signed-off-by: default avatarJustin TerAvest <teravest@google.com>
Acked-by: default avatarVivek Goyal <vgoyal@redhat.com>
Signed-off-by: default avatarJens Axboe <jaxboe@fusionio.com>
parent 95f28604

block/cfq-iosched.c

+41 −12
Original line number Diff line number Diff line
@@ -178,6 +178,8 @@ struct cfq_group { 
	/* group service_tree key */

	u64 vdisktime;

	unsigned int weight;

	unsigned int new_weight;

	bool needs_update;



	/* number of cfqq currently on this group */

	int nr_cfqq;
@@ -853,7 +855,27 @@ __cfq_group_service_tree_add(struct cfq_rb_root *st, struct cfq_group *cfqg) 
}



static void

cfq_group_service_tree_add(struct cfq_data *cfqd, struct cfq_group *cfqg)

cfq_update_group_weight(struct cfq_group *cfqg)

{

	BUG_ON(!RB_EMPTY_NODE(&cfqg->rb_node));

	if (cfqg->needs_update) {

		cfqg->weight = cfqg->new_weight;

		cfqg->needs_update = false;

	}

}



static void

cfq_group_service_tree_add(struct cfq_rb_root *st, struct cfq_group *cfqg)

{

	BUG_ON(!RB_EMPTY_NODE(&cfqg->rb_node));



	cfq_update_group_weight(cfqg);

	__cfq_group_service_tree_add(st, cfqg);

	st->total_weight += cfqg->weight;

}



static void

cfq_group_notify_queue_add(struct cfq_data *cfqd, struct cfq_group *cfqg)

{

	struct cfq_rb_root *st = &cfqd->grp_service_tree;

	struct cfq_group *__cfqg;
@@ -874,13 +896,19 @@ cfq_group_service_tree_add(struct cfq_data *cfqd, struct cfq_group *cfqg) 
		cfqg->vdisktime = __cfqg->vdisktime + CFQ_IDLE_DELAY;

	} else

		cfqg->vdisktime = st->min_vdisktime;

	cfq_group_service_tree_add(st, cfqg);

}



	__cfq_group_service_tree_add(st, cfqg);

	st->total_weight += cfqg->weight;

static void

cfq_group_service_tree_del(struct cfq_rb_root *st, struct cfq_group *cfqg)

{

	st->total_weight -= cfqg->weight;

	if (!RB_EMPTY_NODE(&cfqg->rb_node))

		cfq_rb_erase(&cfqg->rb_node, st);

}



static void

cfq_group_service_tree_del(struct cfq_data *cfqd, struct cfq_group *cfqg)

cfq_group_notify_queue_del(struct cfq_data *cfqd, struct cfq_group *cfqg)

{

	struct cfq_rb_root *st = &cfqd->grp_service_tree;
@@ -892,9 +920,7 @@ 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 -= cfqg->weight;

	if (!RB_EMPTY_NODE(&cfqg->rb_node))

		cfq_rb_erase(&cfqg->rb_node, st);

	cfq_group_service_tree_del(st, cfqg);

	cfqg->saved_workload_slice = 0;

	cfq_blkiocg_update_dequeue_stats(&cfqg->blkg, 1);

}
@@ -948,9 +974,10 @@ 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(&cfqg->rb_node, st);

	cfq_group_service_tree_del(st, cfqg);

	cfqg->vdisktime += cfq_scale_slice(charge, cfqg);

	__cfq_group_service_tree_add(st, cfqg);

	/* If a new weight was requested, update now, off tree */

	cfq_group_service_tree_add(st, cfqg);



	/* This group is being expired. Save the context */

	if (time_after(cfqd->workload_expires, jiffies)) {
@@ -982,7 +1009,9 @@ static inline struct cfq_group *cfqg_of_blkg(struct blkio_group *blkg) 
void cfq_update_blkio_group_weight(void *key, struct blkio_group *blkg,

					unsigned int weight)

{

	cfqg_of_blkg(blkg)->weight = weight;

	struct cfq_group *cfqg = cfqg_of_blkg(blkg);

	cfqg->new_weight = weight;

	cfqg->needs_update = true;

}



static struct cfq_group *
@@ -1255,7 +1284,7 @@ static void cfq_service_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq, 
	service_tree->count++;

	if ((add_front || !new_cfqq) && !group_changed)

		return;

	cfq_group_service_tree_add(cfqd, cfqq->cfqg);

	cfq_group_notify_queue_add(cfqd, cfqq->cfqg);

}



static struct cfq_queue *
@@ -1368,7 +1397,7 @@ static void cfq_del_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq) 
		cfqq->p_root = NULL;

	}



	cfq_group_service_tree_del(cfqd, cfqq->cfqg);

	cfq_group_notify_queue_del(cfqd, cfqq->cfqg);

	BUG_ON(!cfqd->busy_queues);

	cfqd->busy_queues--;

	if (cfq_cfqq_sync(cfqq))

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