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path: root/lib/rwsem-spinlock.c
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Diffstat (limited to 'lib/rwsem-spinlock.c')
-rw-r--r--lib/rwsem-spinlock.c69
1 files changed, 24 insertions, 45 deletions
diff --git a/lib/rwsem-spinlock.c b/lib/rwsem-spinlock.c
index 7e0d6a58fc83..7542afbb22b3 100644
--- a/lib/rwsem-spinlock.c
+++ b/lib/rwsem-spinlock.c
@@ -73,20 +73,13 @@ __rwsem_do_wake(struct rw_semaphore *sem, int wakewrite)
goto dont_wake_writers;
}
- /* if we are allowed to wake writers try to grant a single write lock
- * if there's a writer at the front of the queue
- * - we leave the 'waiting count' incremented to signify potential
- * contention
+ /*
+ * as we support write lock stealing, we can't set sem->activity
+ * to -1 here to indicate we get the lock. Instead, we wake it up
+ * to let it go get it again.
*/
if (waiter->flags & RWSEM_WAITING_FOR_WRITE) {
- sem->activity = -1;
- list_del(&waiter->list);
- tsk = waiter->task;
- /* Don't touch waiter after ->task has been NULLed */
- smp_mb();
- waiter->task = NULL;
- wake_up_process(tsk);
- put_task_struct(tsk);
+ wake_up_process(waiter->task);
goto out;
}
@@ -121,18 +114,10 @@ static inline struct rw_semaphore *
__rwsem_wake_one_writer(struct rw_semaphore *sem)
{
struct rwsem_waiter *waiter;
- struct task_struct *tsk;
-
- sem->activity = -1;
waiter = list_entry(sem->wait_list.next, struct rwsem_waiter, list);
- list_del(&waiter->list);
+ wake_up_process(waiter->task);
- tsk = waiter->task;
- smp_mb();
- waiter->task = NULL;
- wake_up_process(tsk);
- put_task_struct(tsk);
return sem;
}
@@ -204,7 +189,6 @@ int __down_read_trylock(struct rw_semaphore *sem)
/*
* get a write lock on the semaphore
- * - we increment the waiting count anyway to indicate an exclusive lock
*/
void __sched __down_write_nested(struct rw_semaphore *sem, int subclass)
{
@@ -214,37 +198,32 @@ void __sched __down_write_nested(struct rw_semaphore *sem, int subclass)
raw_spin_lock_irqsave(&sem->wait_lock, flags);
- if (sem->activity == 0 && list_empty(&sem->wait_list)) {
- /* granted */
- sem->activity = -1;
- raw_spin_unlock_irqrestore(&sem->wait_lock, flags);
- goto out;
- }
-
- tsk = current;
- set_task_state(tsk, TASK_UNINTERRUPTIBLE);
-
/* set up my own style of waitqueue */
+ tsk = current;
waiter.task = tsk;
waiter.flags = RWSEM_WAITING_FOR_WRITE;
- get_task_struct(tsk);
-
list_add_tail(&waiter.list, &sem->wait_list);
- /* we don't need to touch the semaphore struct anymore */
- raw_spin_unlock_irqrestore(&sem->wait_lock, flags);
-
- /* wait to be given the lock */
+ /* wait for someone to release the lock */
for (;;) {
- if (!waiter.task)
+ /*
+ * That is the key to support write lock stealing: allows the
+ * task already on CPU to get the lock soon rather than put
+ * itself into sleep and waiting for system woke it or someone
+ * else in the head of the wait list up.
+ */
+ if (sem->activity == 0)
break;
- schedule();
set_task_state(tsk, TASK_UNINTERRUPTIBLE);
+ raw_spin_unlock_irqrestore(&sem->wait_lock, flags);
+ schedule();
+ raw_spin_lock_irqsave(&sem->wait_lock, flags);
}
+ /* got the lock */
+ sem->activity = -1;
+ list_del(&waiter.list);
- tsk->state = TASK_RUNNING;
- out:
- ;
+ raw_spin_unlock_irqrestore(&sem->wait_lock, flags);
}
void __sched __down_write(struct rw_semaphore *sem)
@@ -262,8 +241,8 @@ int __down_write_trylock(struct rw_semaphore *sem)
raw_spin_lock_irqsave(&sem->wait_lock, flags);
- if (sem->activity == 0 && list_empty(&sem->wait_list)) {
- /* granted */
+ if (sem->activity == 0) {
+ /* got the lock */
sem->activity = -1;
ret = 1;
}