[Devel] Re: [PATCH 21/25] io-controller: Per cgroup request descriptor support

[Gui Jianfeng]

Vivek Goyal wrote:
...
>  }
> +#ifdef CONFIG_GROUP_IOSCHED
> +static ssize_t queue_group_requests_show(struct request_queue *q, char *page)
> +{
> +	return queue_var_show(q->nr_group_requests, (page));
> +}
> +
> +static ssize_t
> +queue_group_requests_store(struct request_queue *q, const char *page,
> +					size_t count)
> +{
> +	unsigned long nr;
> +	int ret = queue_var_store(&nr, page, count);
> +	if (nr < BLKDEV_MIN_RQ)
> +		nr = BLKDEV_MIN_RQ;
> +
> +	spin_lock_irq(q->queue_lock);
> +	q->nr_group_requests = nr;
> +	spin_unlock_irq(q->queue_lock);
> +	return ret;
> +}
> +#endif

Hi Vivek,

Do we need to update the congestion thresholds for allocated io groups?

Signed-off-by: Gui Jianfeng <guijianfeng at cn.fujitsu.com>
---
 block/blk-sysfs.c |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 577ed42..92b9f25 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -83,17 +83,32 @@ static ssize_t queue_group_requests_show(struct request_queue *q, char *page)
 	return queue_var_show(q->nr_group_requests, (page));
 }
 
+extern void elv_io_group_congestion_threshold(struct request_queue *q,
+					      struct io_group *iog);
+
 static ssize_t
 queue_group_requests_store(struct request_queue *q, const char *page,
 					size_t count)
 {
+	struct hlist_node *n;
+	struct io_group *iog;
+	struct elv_fq_data *efqd;
 	unsigned long nr;
 	int ret = queue_var_store(&nr, page, count);
+
 	if (nr < BLKDEV_MIN_RQ)
 		nr = BLKDEV_MIN_RQ;
 
 	spin_lock_irq(q->queue_lock);
+
 	q->nr_group_requests = nr;
+
+	efqd = &q->elevator->efqd;
+
+	hlist_for_each_entry(iog, n, &efqd->group_list, elv_data_node) {
+		elv_io_group_congestion_threshold(q, iog);
+	}
+
 	spin_unlock_irq(q->queue_lock);
 	return ret;
 }
-- 
1.5.4.rc3 

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