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SUNRPC: Queue latency-sensitive socket tasks to xprtiod 

The response to a write_space notification is very latency sensitive,
so we should queue it to the lower latency xprtiod_workqueue. This
is something we already do for the other cases where an rpc task
holds the transport XPRT_LOCKED bitlock.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2018-02-07 09:13:04 -05:00
parent 0c8cbcd337
commit 2275cde4cc
3 changed files with 17 additions and 1 deletions
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3
include/linux/sunrpc/sched.h
View File

@ -229,6 +229,9 @@ void rpc_sleep_on_priority(struct rpc_wait_queue *,
struct rpc_task *,
rpc_action action,
int priority);
void rpc_wake_up_queued_task_on_wq(struct workqueue_struct *wq,
struct rpc_wait_queue *queue,
struct rpc_task *task);
void rpc_wake_up_queued_task(struct rpc_wait_queue *,
struct rpc_task *);
void rpc_wake_up(struct rpc_wait_queue *);

12
net/sunrpc/sched.c
View File

@ -458,6 +458,18 @@ static void rpc_wake_up_task_queue_locked(struct rpc_wait_queue *queue, struct r
rpc_wake_up_task_on_wq_queue_locked(rpciod_workqueue, queue, task);
}
/*
* Wake up a task on a specific queue
*/
void rpc_wake_up_queued_task_on_wq(struct workqueue_struct *wq,
struct rpc_wait_queue *queue,
struct rpc_task *task)
{
spin_lock_bh(&queue->lock);
rpc_wake_up_task_on_wq_queue_locked(wq, queue, task);
spin_unlock_bh(&queue->lock);
}
/*
* Wake up a task on a specific queue
*/

3
net/sunrpc/xprt.c
View File

@ -517,7 +517,8 @@ void xprt_write_space(struct rpc_xprt *xprt)
if (xprt->snd_task) {
dprintk("RPC: write space: waking waiting task on "
"xprt %p\n", xprt);
rpc_wake_up_queued_task(&xprt->pending, xprt->snd_task);
rpc_wake_up_queued_task_on_wq(xprtiod_workqueue,
&xprt->pending, xprt->snd_task);
}
spin_unlock_bh(&xprt->transport_lock);
}