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SubjectRe: [PATCH 21/25] io-controller: Per cgroup request descriptor support
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@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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