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SUNRPC: rpc_wake_up() should wake up tasks in the correct order

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[ Upstream commit e4c72201b6ec3173dfe13fa2e2335a3ad78d4921 ]

Currently, we wake up the tasks by priority queue ordering, which means
that we ignore the batching that is supposed to help with QoS issues.

Fixes: c049f8ea9a ("SUNRPC: Remove the bh-safe lock requirement on the rpc_wait_queue->lock")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Trond Myklebust 2020-10-22 17:40:33 -04:00 committed by Greg Kroah-Hartman
parent bd6019d83a
commit d1296acac0
1 changed files with 36 additions and 31 deletions
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67
net/sunrpc/sched.c
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@ -675,6 +675,23 @@ struct rpc_task *rpc_wake_up_next(struct rpc_wait_queue *queue)
}
EXPORT_SYMBOL_GPL(rpc_wake_up_next);
/**
* rpc_wake_up_locked - wake up all rpc_tasks
* @queue: rpc_wait_queue on which the tasks are sleeping
*
*/
static void rpc_wake_up_locked(struct rpc_wait_queue *queue)
{
struct rpc_task *task;
for (;;) {
task = __rpc_find_next_queued(queue);
if (task == NULL)
break;
rpc_wake_up_task_queue_locked(queue, task);
}
}
/**
* rpc_wake_up - wake up all rpc_tasks
* @queue: rpc_wait_queue on which the tasks are sleeping
@ -683,26 +700,29 @@ EXPORT_SYMBOL_GPL(rpc_wake_up_next);
*/
void rpc_wake_up(struct rpc_wait_queue *queue)
{
struct list_head *head;
spin_lock(&queue->lock);
head = &queue->tasks[queue->maxpriority];
for (;;) {
while (!list_empty(head)) {
struct rpc_task *task;
task = list_first_entry(head,
struct rpc_task,
u.tk_wait.list);
rpc_wake_up_task_queue_locked(queue, task);
}
if (head == &queue->tasks[0])
break;
head--;
}
rpc_wake_up_locked(queue);
spin_unlock(&queue->lock);
}
EXPORT_SYMBOL_GPL(rpc_wake_up);
/**
* rpc_wake_up_status_locked - wake up all rpc_tasks and set their status value.
* @queue: rpc_wait_queue on which the tasks are sleeping
* @status: status value to set
*/
static void rpc_wake_up_status_locked(struct rpc_wait_queue *queue, int status)
{
struct rpc_task *task;
for (;;) {
task = __rpc_find_next_queued(queue);
if (task == NULL)
break;
rpc_wake_up_task_queue_set_status_locked(queue, task, status);
}
}
/**
* rpc_wake_up_status - wake up all rpc_tasks and set their status value.
* @queue: rpc_wait_queue on which the tasks are sleeping
@ -712,23 +732,8 @@ EXPORT_SYMBOL_GPL(rpc_wake_up);
*/
void rpc_wake_up_status(struct rpc_wait_queue *queue, int status)
{
struct list_head *head;
spin_lock(&queue->lock);
head = &queue->tasks[queue->maxpriority];
for (;;) {
while (!list_empty(head)) {
struct rpc_task *task;
task = list_first_entry(head,
struct rpc_task,
u.tk_wait.list);
task->tk_status = status;
rpc_wake_up_task_queue_locked(queue, task);
}
if (head == &queue->tasks[0])
break;
head--;
}
rpc_wake_up_status_locked(queue, status);
spin_unlock(&queue->lock);
}
EXPORT_SYMBOL_GPL(rpc_wake_up_status);