Release 4.14 net/sunrpc/sched.c

Directory: net/sunrpc
/*
 * linux/net/sunrpc/sched.c
 *
 * Scheduling for synchronous and asynchronous RPC requests.
 *
 * Copyright (C) 1996 Olaf Kirch, <okir@monad.swb.de>
 *
 * TCP NFS related read + write fixes
 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
 */

#include <linux/module.h>

#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/mempool.h>
#include <linux/smp.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/freezer.h>

#include <linux/sunrpc/clnt.h>

#include "sunrpc.h"

#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)

#define RPCDBG_FACILITY		RPCDBG_SCHED
#endif


#define CREATE_TRACE_POINTS
#include <trace/events/sunrpc.h>

/*
 * RPC slabs and memory pools
 */

#define RPC_BUFFER_MAXSIZE	(2048)

#define RPC_BUFFER_POOLSIZE	(8)

#define RPC_TASK_POOLSIZE	(8)

static struct kmem_cache	*rpc_task_slabp __read_mostly;

static struct kmem_cache	*rpc_buffer_slabp __read_mostly;

static mempool_t	*rpc_task_mempool __read_mostly;

static mempool_t	*rpc_buffer_mempool __read_mostly;

static void			rpc_async_schedule(struct work_struct *);
static void			 rpc_release_task(struct rpc_task *task);
static void __rpc_queue_timer_fn(unsigned long ptr);

/*
 * RPC tasks sit here while waiting for conditions to improve.
 */

static struct rpc_wait_queue delay_queue;

/*
 * rpciod-related stuff
 */

struct workqueue_struct *rpciod_workqueue __read_mostly;

struct workqueue_struct *xprtiod_workqueue __read_mostly;

/*
 * Disable the timer for a given RPC task. Should be called with
 * queue->lock and bh_disabled in order to avoid races within
 * rpc_run_timer().
 */

static void

__rpc_disable_timer(struct rpc_wait_queue *queue, struct rpc_task *task)
{
	if (task->tk_timeout == 0)
		return;
	dprintk("RPC: %5u disabling timer\n", task->tk_pid);
	task->tk_timeout = 0;
	list_del(&task->u.tk_wait.timer_list);
	if (list_empty(&queue->timer_list.list))
		del_timer(&queue->timer_list.timer);
}

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static void

rpc_set_queue_timer(struct rpc_wait_queue *queue, unsigned long expires)
{
	queue->timer_list.expires = expires;
	mod_timer(&queue->timer_list.timer, expires);
}

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/*
 * Set up a timer for the current task.
 */

static void

__rpc_add_timer(struct rpc_wait_queue *queue, struct rpc_task *task)
{
	if (!task->tk_timeout)
		return;

	dprintk("RPC: %5u setting alarm for %u ms\n",
		task->tk_pid, jiffies_to_msecs(task->tk_timeout));

	task->u.tk_wait.expires = jiffies + task->tk_timeout;
	if (list_empty(&queue->timer_list.list) || time_before(task->u.tk_wait.expires, queue->timer_list.expires))
		rpc_set_queue_timer(queue, task->u.tk_wait.expires);
	list_add(&task->u.tk_wait.timer_list, &queue->timer_list.list);
}

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static void rpc_rotate_queue_owner(struct rpc_wait_queue *queue)
{
	struct list_head *q = &queue->tasks[queue->priority];
	struct rpc_task *task;

	if (!list_empty(q)) {
		task = list_first_entry(q, struct rpc_task, u.tk_wait.list);
		if (task->tk_owner == queue->owner)
			list_move_tail(&task->u.tk_wait.list, q);
	}
}

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static void rpc_set_waitqueue_priority(struct rpc_wait_queue *queue, int priority)
{
	if (queue->priority != priority) {
		/* Fairness: rotate the list when changing priority */
		rpc_rotate_queue_owner(queue);
		queue->priority = priority;
	}
}

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static void rpc_set_waitqueue_owner(struct rpc_wait_queue *queue, pid_t pid)
{
	queue->owner = pid;
	queue->nr = RPC_BATCH_COUNT;
}

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static void rpc_reset_waitqueue_priority(struct rpc_wait_queue *queue)
{
	rpc_set_waitqueue_priority(queue, queue->maxpriority);
	rpc_set_waitqueue_owner(queue, 0);
}

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/*
 * Add new request to a priority queue.
 */


static void __rpc_add_wait_queue_priority(struct rpc_wait_queue *queue,
		struct rpc_task *task,
		unsigned char queue_priority)
{
	struct list_head *q;
	struct rpc_task *t;

	INIT_LIST_HEAD(&task->u.tk_wait.links);
	if (unlikely(queue_priority > queue->maxpriority))
		queue_priority = queue->maxpriority;
	if (queue_priority > queue->priority)
		rpc_set_waitqueue_priority(queue, queue_priority);
	q = &queue->tasks[queue_priority];
	list_for_each_entry(t, q, u.tk_wait.list) {
		if (t->tk_owner == task->tk_owner) {
			list_add_tail(&task->u.tk_wait.list, &t->u.tk_wait.links);
			return;
		}
	}
	list_add_tail(&task->u.tk_wait.list, q);
}

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/*
 * Add new request to wait queue.
 *
 * Swapper tasks always get inserted at the head of the queue.
 * This should avoid many nasty memory deadlocks and hopefully
 * improve overall performance.
 * Everyone else gets appended to the queue to ensure proper FIFO behavior.
 */


static void __rpc_add_wait_queue(struct rpc_wait_queue *queue,
		struct rpc_task *task,
		unsigned char queue_priority)
{
	WARN_ON_ONCE(RPC_IS_QUEUED(task));
	if (RPC_IS_QUEUED(task))
		return;

	if (RPC_IS_PRIORITY(queue))
		__rpc_add_wait_queue_priority(queue, task, queue_priority);
	else if (RPC_IS_SWAPPER(task))
		list_add(&task->u.tk_wait.list, &queue->tasks[0]);
	else
		list_add_tail(&task->u.tk_wait.list, &queue->tasks[0]);
	task->tk_waitqueue = queue;
	queue->qlen++;
	/* barrier matches the read in rpc_wake_up_task_queue_locked() */
	smp_wmb();
	rpc_set_queued(task);

	dprintk("RPC: %5u added to queue %p \"%s\"\n",
			task->tk_pid, queue, rpc_qname(queue));
}

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/*
 * Remove request from a priority queue.
 */


static void __rpc_remove_wait_queue_priority(struct rpc_task *task)
{
	struct rpc_task *t;

	if (!list_empty(&task->u.tk_wait.links)) {
		t = list_entry(task->u.tk_wait.links.next, struct rpc_task, u.tk_wait.list);
		list_move(&t->u.tk_wait.list, &task->u.tk_wait.list);
		list_splice_init(&task->u.tk_wait.links, &t->u.tk_wait.links);
	}
}

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/*
 * Remove request from queue.
 * Note: must be called with spin lock held.
 */


static void __rpc_remove_wait_queue(struct rpc_wait_queue *queue, struct rpc_task *task)
{
	__rpc_disable_timer(queue, task);
	if (RPC_IS_PRIORITY(queue))
		__rpc_remove_wait_queue_priority(task);
	list_del(&task->u.tk_wait.list);
	queue->qlen--;
	dprintk("RPC: %5u removed from queue %p \"%s\"\n",
			task->tk_pid, queue, rpc_qname(queue));
}

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static void __rpc_init_priority_wait_queue(struct rpc_wait_queue *queue, const char *qname, unsigned char nr_queues)
{
	int i;

	spin_lock_init(&queue->lock);
	for (i = 0; i < ARRAY_SIZE(queue->tasks); i++)
		INIT_LIST_HEAD(&queue->tasks[i]);
	queue->maxpriority = nr_queues - 1;
	rpc_reset_waitqueue_priority(queue);
	queue->qlen = 0;
	setup_timer(&queue->timer_list.timer, __rpc_queue_timer_fn, (unsigned long)queue);
	INIT_LIST_HEAD(&queue->timer_list.list);
	rpc_assign_waitqueue_name(queue, qname);
}

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void rpc_init_priority_wait_queue(struct rpc_wait_queue *queue, const char *qname)
{
	__rpc_init_priority_wait_queue(queue, qname, RPC_NR_PRIORITY);
}
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EXPORT_SYMBOL_GPL(rpc_init_priority_wait_queue);



void rpc_init_wait_queue(struct rpc_wait_queue *queue, const char *qname)
{
	__rpc_init_priority_wait_queue(queue, qname, 1);
}
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EXPORT_SYMBOL_GPL(rpc_init_wait_queue);



void rpc_destroy_wait_queue(struct rpc_wait_queue *queue)
{
	del_timer_sync(&queue->timer_list.timer);
}
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EXPORT_SYMBOL_GPL(rpc_destroy_wait_queue);



static int rpc_wait_bit_killable(struct wait_bit_key *key, int mode)
{
	freezable_schedule_unsafe();
	if (signal_pending_state(mode, current))
		return -ERESTARTSYS;
	return 0;
}

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#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) || IS_ENABLED(CONFIG_TRACEPOINTS)


static void rpc_task_set_debuginfo(struct rpc_task *task)
{
	static atomic_t rpc_pid;

	task->tk_pid = atomic_inc_return(&rpc_pid);
}
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#else


static inline void rpc_task_set_debuginfo(struct rpc_task *task)
{
}
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#endif



static void rpc_set_active(struct rpc_task *task)
{
	trace_rpc_task_begin(task->tk_client, task, NULL);

	rpc_task_set_debuginfo(task);
	set_bit(RPC_TASK_ACTIVE, &task->tk_runstate);
}

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/*
 * Mark an RPC call as having completed by clearing the 'active' bit
 * and then waking up all tasks that were sleeping.
 */


static int rpc_complete_task(struct rpc_task *task)
{
	void *m = &task->tk_runstate;
	wait_queue_head_t *wq = bit_waitqueue(m, RPC_TASK_ACTIVE);
	struct wait_bit_key k = __WAIT_BIT_KEY_INITIALIZER(m, RPC_TASK_ACTIVE);
	unsigned long flags;
	int ret;

	trace_rpc_task_complete(task->tk_client, task, NULL);

	spin_lock_irqsave(&wq->lock, flags);
	clear_bit(RPC_TASK_ACTIVE, &task->tk_runstate);
	ret = atomic_dec_and_test(&task->tk_count);
	if (waitqueue_active(wq))
		__wake_up_locked_key(wq, TASK_NORMAL, &k);
	spin_unlock_irqrestore(&wq->lock, flags);
	return ret;
}

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/*
 * Allow callers to wait for completion of an RPC call
 *
 * Note the use of out_of_line_wait_on_bit() rather than wait_on_bit()
 * to enforce taking of the wq->lock and hence avoid races with
 * rpc_complete_task().
 */


int __rpc_wait_for_completion_task(struct rpc_task *task, wait_bit_action_f *action)
{
	if (action == NULL)
		action = rpc_wait_bit_killable;
	return out_of_line_wait_on_bit(&task->tk_runstate, RPC_TASK_ACTIVE,
			action, TASK_KILLABLE);
}
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EXPORT_SYMBOL_GPL(__rpc_wait_for_completion_task);

/*
 * Make an RPC task runnable.
 *
 * Note: If the task is ASYNC, and is being made runnable after sitting on an
 * rpc_wait_queue, this must be called with the queue spinlock held to protect
 * the wait queue operation.
 * Note the ordering of rpc_test_and_set_running() and rpc_clear_queued(),
 * which is needed to ensure that __rpc_execute() doesn't loop (due to the
 * lockless RPC_IS_QUEUED() test) before we've had a chance to test
 * the RPC_TASK_RUNNING flag.
 */


static void rpc_make_runnable(struct workqueue_struct *wq,
		struct rpc_task *task)
{
	bool need_wakeup = !rpc_test_and_set_running(task);

	rpc_clear_queued(task);
	if (!need_wakeup)
		return;
	if (RPC_IS_ASYNC(task)) {
		INIT_WORK(&task->u.tk_work, rpc_async_schedule);
		queue_work(wq, &task->u.tk_work);
	} else
		wake_up_bit(&task->tk_runstate, RPC_TASK_QUEUED);
}

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/*
 * Prepare for sleeping on a wait queue.
 * By always appending tasks to the list we ensure FIFO behavior.
 * NB: An RPC task will only receive interrupt-driven events as long
 * as it's on a wait queue.
 */


static void __rpc_sleep_on_priority(struct rpc_wait_queue *q,
		struct rpc_task *task,
		rpc_action action,
		unsigned char queue_priority)
{
	dprintk("RPC: %5u sleep_on(queue \"%s\" time %lu)\n",
			task->tk_pid, rpc_qname(q), jiffies);

	trace_rpc_task_sleep(task->tk_client, task, q);

	__rpc_add_wait_queue(q, task, queue_priority);

	WARN_ON_ONCE(task->tk_callback != NULL);
	task->tk_callback = action;
	__rpc_add_timer(q, task);
}

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Total 81 100.00% 12 100.00%



void rpc_sleep_on(struct rpc_wait_queue *q, struct rpc_task *task,
				rpc_action action)
{
	/* We shouldn't ever put an inactive task to sleep */
	WARN_ON_ONCE(!RPC_IS_ACTIVATED(task));
	if (!RPC_IS_ACTIVATED(task)) {
		task->tk_status = -EIO;
		rpc_put_task_async(task);
		return;
	}

	/*
         * Protect the queue operations.
         */
	spin_lock_bh(&q->lock);
	__rpc_sleep_on_priority(q, task, action, task->tk_priority);
	spin_unlock_bh(&q->lock);
}
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EXPORT_SYMBOL_GPL(rpc_sleep_on);



void rpc_sleep_on_priority(struct rpc_wait_queue *q, struct rpc_task *task,
		rpc_action action, int priority)
{
	/* We shouldn't ever put an inactive task to sleep */
	WARN_ON_ONCE(!RPC_IS_ACTIVATED(task));
	if (!RPC_IS_ACTIVATED(task)) {
		task->tk_status = -EIO;
		rpc_put_task_async(task);
		return;
	}

	/*
         * Protect the queue operations.
         */
	spin_lock_bh(&q->lock);
	__rpc_sleep_on_priority(q, task, action, priority - RPC_PRIORITY_LOW);
	spin_unlock_bh(&q->lock);
}
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EXPORT_SYMBOL_GPL(rpc_sleep_on_priority);

/**
 * __rpc_do_wake_up_task_on_wq - wake up a single rpc_task
 * @wq: workqueue on which to run task
 * @queue: wait queue
 * @task: task to be woken up
 *
 * Caller must hold queue->lock, and have cleared the task queued flag.
 */


static void __rpc_do_wake_up_task_on_wq(struct workqueue_struct *wq,
		struct rpc_wait_queue *queue,
		struct rpc_task *task)
{
	dprintk("RPC: %5u __rpc_wake_up_task (now %lu)\n",
			task->tk_pid, jiffies);

	/* Has the task been executed yet? If not, we cannot wake it up! */
	if (!RPC_IS_ACTIVATED(task)) {
		printk(KERN_ERR "RPC: Inactive task (%p) being woken up!\n", task);
		return;
	}

	trace_rpc_task_wakeup(task->tk_client, task, queue);

	__rpc_remove_wait_queue(queue, task);

	rpc_make_runnable(wq, task);

	dprintk("RPC:       __rpc_wake_up_task done\n");
}

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/*
 * Wake up a queued task while the queue lock is being held
 */


static void rpc_wake_up_task_on_wq_queue_locked(struct workqueue_struct *wq,
		struct rpc_wait_queue *queue, struct rpc_task *task)
{
	if (RPC_IS_QUEUED(task)) {
		smp_rmb();
		if (task->tk_waitqueue == queue)
			__rpc_do_wake_up_task_on_wq(wq, queue, task);
	}
}

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/*
 * Wake up a queued task while the queue lock is being held
 */


static void rpc_wake_up_task_queue_locked(struct rpc_wait_queue *queue, struct rpc_task *task)
{
	rpc_wake_up_task_on_wq_queue_locked(rpciod_workqueue, queue, task);
}

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/*
 * Wake up a task on a specific queue
 */


void rpc_wake_up_queued_task(struct rpc_wait_queue *queue, struct rpc_task *task)
{
	spin_lock_bh(&queue->lock);
	rpc_wake_up_task_queue_locked(queue, task);
	spin_unlock_bh(&queue->lock);
}
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EXPORT_SYMBOL_GPL(rpc_wake_up_queued_task);

/*
 * Wake up the next task on a priority queue.
 */


static struct rpc_task *__rpc_find_next_queued_priority(struct rpc_wait_queue *queue)
{
	struct list_head *q;
	struct rpc_task *task;

	/*
         * Service a batch of tasks from a single owner.
         */
	q = &queue->tasks[queue->priority];
	if (!list_empty(q)) {
		task = list_entry(q->next, struct rpc_task, u.tk_wait.list);
		if (queue->owner == task->tk_owner) {
			if (--queue->nr)
				goto out;
			list_move_tail(&task->u.tk_wait.list, q);
		}
		/*
                 * Check if we need to switch queues.
                 */
		goto new_owner;
	}

	/*
         * Service the next queue.
         */
	do {
		if (q == &queue->tasks[0])
			q = &queue->tasks[queue->maxpriority];
		else
			q = q - 1;
		if (!list_empty(q)) {
			task = list_entry(q->next, struct rpc_task, u.tk_wait.list);
			goto new_queue;
		}
	} while (q != &queue->tasks[queue->priority]);

	rpc_reset_waitqueue_priority(queue);
	return NULL;

new_queue:
	rpc_set_waitqueue_priority(queue, (unsigned int)(q - &queue->tasks[0]));
new_owner:
	rpc_set_waitqueue_owner(queue, task->tk_owner);
out:
	return task;
}

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static struct rpc_task *__rpc_find_next_queued(struct rpc_wait_queue *queue)
{
	if (RPC_IS_PRIORITY(queue))
		return __rpc_find_next_queued_priority(queue);
	if (!list_empty(&queue->tasks[0]))
		return list_first_entry(&queue->tasks[0]
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Total	74	100.00%	4	100.00%
cregit-Linux how code gets into the kernel

Release 4.14 net/sunrpc/sched.c

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Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors
