* Boston, MA 021110-1307, USA.
*/
-#include <linux/version.h>
#include <linux/kthread.h>
#include <linux/list.h>
#include <linux/spinlock.h>
-# include <linux/freezer.h>
+#include <linux/freezer.h>
+#include <linux/ftrace.h>
#include "async-thread.h"
#define WORK_QUEUED_BIT 0
spin_lock_irqsave(&workers->lock, flags);
- while(!list_empty(&workers->order_list)) {
+ while (!list_empty(&workers->order_list)) {
work = list_entry(workers->order_list.next,
struct btrfs_work, order_list);
struct btrfs_work *work;
do {
spin_lock_irq(&worker->lock);
- while(!list_empty(&worker->pending)) {
+again_locked:
+ while (!list_empty(&worker->pending)) {
cur = worker->pending.next;
work = list_entry(cur, struct btrfs_work, list);
list_del(&work->list);
check_idle_worker(worker);
}
- worker->working = 0;
if (freezing(current)) {
+ worker->working = 0;
+ spin_unlock_irq(&worker->lock);
refrigerator();
} else {
- set_current_state(TASK_INTERRUPTIBLE);
spin_unlock_irq(&worker->lock);
- schedule();
+ if (!kthread_should_stop()) {
+ cpu_relax();
+ /*
+ * we've dropped the lock, did someone else
+ * jump_in?
+ */
+ smp_mb();
+ if (!list_empty(&worker->pending))
+ continue;
+
+ /*
+ * this short schedule allows more work to
+ * come in without the queue functions
+ * needing to go through wake_up_process()
+ *
+ * worker->working is still 1, so nobody
+ * is going to try and wake us up
+ */
+ schedule_timeout(1);
+ smp_mb();
+ if (!list_empty(&worker->pending))
+ continue;
+
+ /* still no more work?, sleep for real */
+ spin_lock_irq(&worker->lock);
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (!list_empty(&worker->pending))
+ goto again_locked;
+
+ /*
+ * this makes sure we get a wakeup when someone
+ * adds something new to the queue
+ */
+ worker->working = 0;
+ spin_unlock_irq(&worker->lock);
+
+ schedule();
+ }
__set_current_state(TASK_RUNNING);
}
} while (!kthread_should_stop());
struct btrfs_worker_thread *worker;
list_splice_init(&workers->idle_list, &workers->worker_list);
- while(!list_empty(&workers->worker_list)) {
+ while (!list_empty(&workers->worker_list)) {
cur = workers->worker_list.next;
worker = list_entry(cur, struct btrfs_worker_thread,
worker_list);
{
struct btrfs_worker_thread *worker = work->worker;
unsigned long flags;
+ int wake = 0;
if (test_and_set_bit(WORK_QUEUED_BIT, &work->flags))
goto out;
spin_lock_irqsave(&worker->lock, flags);
- atomic_inc(&worker->num_pending);
list_add_tail(&work->list, &worker->pending);
+ atomic_inc(&worker->num_pending);
/* by definition we're busy, take ourselves off the idle
* list
&worker->workers->worker_list);
spin_unlock_irqrestore(&worker->workers->lock, flags);
}
+ if (!worker->working) {
+ wake = 1;
+ worker->working = 1;
+ }
spin_unlock_irqrestore(&worker->lock, flags);
-
+ if (wake)
+ wake_up_process(worker->task);
out:
+
return 0;
}
}
spin_lock_irqsave(&worker->lock, flags);
+
+ list_add_tail(&work->list, &worker->pending);
atomic_inc(&worker->num_pending);
check_busy_worker(worker);
- list_add_tail(&work->list, &worker->pending);
/*
* avoid calling into wake_up_process if this thread has already