Commit 7249e7d7 authored by Ingo Molnar's avatar Ingo Molnar

Merge k:t into elte.hu:/home/mingo/BK/mine/linux-2.5-latest

parents 7ef17402 0ed4dd24
......@@ -119,7 +119,7 @@ pipe_read(struct file *filp, char *buf, size_t count, loff_t *ppos)
* writers synchronously that there is more
* room.
*/
wake_up_interruptible(PIPE_WAIT(*inode));
wake_up_interruptible_sync(PIPE_WAIT(*inode));
kill_fasync(PIPE_FASYNC_WRITERS(*inode), SIGIO, POLL_OUT);
if (!PIPE_EMPTY(*inode))
BUG();
......@@ -219,7 +219,7 @@ pipe_write(struct file *filp, const char *buf, size_t count, loff_t *ppos)
* is going to give up this CPU, so it doesnt have
* to do idle reschedules.
*/
wake_up_interruptible(PIPE_WAIT(*inode));
wake_up_interruptible_sync(PIPE_WAIT(*inode));
kill_fasync(PIPE_FASYNC_READERS(*inode), SIGIO, POLL_IN);
PIPE_WAITING_WRITERS(*inode)++;
pipe_wait(inode);
......
......@@ -491,6 +491,7 @@ extern unsigned long prof_len;
extern unsigned long prof_shift;
extern void FASTCALL(__wake_up(wait_queue_head_t *q, unsigned int mode, int nr));
extern void FASTCALL(__wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr));
extern void FASTCALL(sleep_on(wait_queue_head_t *q));
extern long FASTCALL(sleep_on_timeout(wait_queue_head_t *q,
signed long timeout));
......@@ -507,6 +508,11 @@ extern void FASTCALL(sched_exit(task_t * p));
#define wake_up_interruptible(x) __wake_up((x),TASK_INTERRUPTIBLE, 1)
#define wake_up_interruptible_nr(x, nr) __wake_up((x),TASK_INTERRUPTIBLE, nr)
#define wake_up_interruptible_all(x) __wake_up((x),TASK_INTERRUPTIBLE, 0)
#ifdef CONFIG_SMP
#define wake_up_interruptible_sync(x) __wake_up_sync((x),TASK_INTERRUPTIBLE, 1)
#else
#define wake_up_interruptible_sync(x) __wake_up((x),TASK_INTERRUPTIBLE, 1)
#endif
asmlinkage long sys_wait4(pid_t pid,unsigned int * stat_addr, int options, struct rusage * ru);
extern int in_group_p(gid_t);
......
......@@ -157,6 +157,12 @@ do { \
preempt_enable(); \
} while (0)
#define spin_unlock_no_resched(lock) \
do { \
_raw_spin_unlock(lock); \
preempt_enable_no_resched(); \
} while (0)
#define read_lock(lock) ({preempt_disable(); _raw_read_lock(lock);})
#define read_unlock(lock) ({_raw_read_unlock(lock); preempt_enable();})
#define write_lock(lock) ({preempt_disable(); _raw_write_lock(lock);})
......@@ -174,6 +180,7 @@ do { \
#define spin_lock(lock) _raw_spin_lock(lock)
#define spin_trylock(lock) _raw_spin_trylock(lock)
#define spin_unlock(lock) _raw_spin_unlock(lock)
#define spin_unlock_no_resched(lock) _raw_spin_unlock(lock)
#define read_lock(lock) _raw_read_lock(lock)
#define read_unlock(lock) _raw_read_unlock(lock)
......
......@@ -457,6 +457,9 @@ EXPORT_SYMBOL(iomem_resource);
/* process management */
EXPORT_SYMBOL(complete_and_exit);
EXPORT_SYMBOL(__wake_up);
#if CONFIG_SMP
EXPORT_SYMBOL_GPL(__wake_up_sync); /* internal use only */
#endif
EXPORT_SYMBOL(wake_up_process);
EXPORT_SYMBOL(sleep_on);
EXPORT_SYMBOL(sleep_on_timeout);
......
......@@ -135,7 +135,6 @@ struct prio_array {
*/
struct runqueue {
spinlock_t lock;
spinlock_t frozen;
unsigned long nr_running, nr_switches, expired_timestamp;
signed long nr_uninterruptible;
task_t *curr, *idle;
......@@ -153,17 +152,21 @@ static struct runqueue runqueues[NR_CPUS] __cacheline_aligned;
#define cpu_curr(cpu) (cpu_rq(cpu)->curr)
#define rt_task(p) ((p)->prio < MAX_RT_PRIO)
/*
* task_rq_lock - lock the runqueue a given task resides on and disable
* interrupts. Note the ordering: we can safely lookup the task_rq without
* explicitly disabling preemption.
*/
static inline runqueue_t *task_rq_lock(task_t *p, unsigned long *flags)
{
struct runqueue *rq;
repeat_lock_task:
preempt_disable();
local_irq_save(*flags);
rq = task_rq(p);
spin_lock_irqsave(&rq->lock, *flags);
spin_lock(&rq->lock);
if (unlikely(rq != task_rq(p))) {
spin_unlock_irqrestore(&rq->lock, *flags);
preempt_enable();
goto repeat_lock_task;
}
return rq;
......@@ -172,7 +175,23 @@ static inline runqueue_t *task_rq_lock(task_t *p, unsigned long *flags)
static inline void task_rq_unlock(runqueue_t *rq, unsigned long *flags)
{
spin_unlock_irqrestore(&rq->lock, *flags);
preempt_enable();
}
/*
* rq_lock - lock a given runqueue and disable interrupts.
*/
static inline runqueue_t *rq_lock(runqueue_t *rq)
{
local_irq_disable();
rq = this_rq();
spin_lock(&rq->lock);
return rq;
}
static inline void rq_unlock(runqueue_t *rq)
{
spin_unlock(&rq->lock);
local_irq_enable();
}
/*
......@@ -322,40 +341,50 @@ void kick_if_running(task_t * p)
* "current->state = TASK_RUNNING" to mark yourself runnable
* without the overhead of this.
*/
static int try_to_wake_up(task_t * p)
static int try_to_wake_up(task_t * p, int sync)
{
unsigned long flags;
int success = 0;
long old_state;
runqueue_t *rq;
repeat_lock_task:
rq = task_rq_lock(p, &flags);
old_state = p->state;
p->state = TASK_RUNNING;
if (!p->array) {
if (unlikely(sync && (rq->curr != p))) {
if (p->thread_info->cpu != smp_processor_id()) {
p->thread_info->cpu = smp_processor_id();
task_rq_unlock(rq, &flags);
goto repeat_lock_task;
}
}
if (old_state == TASK_UNINTERRUPTIBLE)
rq->nr_uninterruptible--;
activate_task(p, rq);
/*
* If sync is set, a resched_task() is a NOOP
*/
if (p->prio < rq->curr->prio)
resched_task(rq->curr);
success = 1;
}
p->state = TASK_RUNNING;
task_rq_unlock(rq, &flags);
return success;
}
int wake_up_process(task_t * p)
{
return try_to_wake_up(p);
return try_to_wake_up(p, 0);
}
void wake_up_forked_process(task_t * p)
{
runqueue_t *rq;
preempt_disable();
rq = this_rq();
spin_lock_irq(&rq->lock);
rq = rq_lock(rq);
p->state = TASK_RUNNING;
if (!rt_task(p)) {
......@@ -371,8 +400,7 @@ void wake_up_forked_process(task_t * p)
p->thread_info->cpu = smp_processor_id();
activate_task(p, rq);
spin_unlock_irq(&rq->lock);
preempt_enable();
rq_unlock(rq);
}
/*
......@@ -403,7 +431,7 @@ void sched_exit(task_t * p)
#if CONFIG_SMP || CONFIG_PREEMPT
asmlinkage void schedule_tail(void)
{
spin_unlock_irq(&this_rq()->frozen);
spin_unlock_irq(&this_rq()->lock);
}
#endif
......@@ -828,9 +856,6 @@ asmlinkage void schedule(void)
if (likely(prev != next)) {
rq->nr_switches++;
rq->curr = next;
spin_lock(&rq->frozen);
spin_unlock(&rq->lock);
context_switch(prev, next);
/*
......@@ -840,10 +865,8 @@ asmlinkage void schedule(void)
*/
mb();
rq = this_rq();
spin_unlock_irq(&rq->frozen);
} else {
spin_unlock_irq(&rq->lock);
}
spin_unlock_irq(&rq->lock);
reacquire_kernel_lock(current);
preempt_enable_no_resched();
......@@ -880,7 +903,7 @@ asmlinkage void preempt_schedule(void)
* started to run but is not in state TASK_RUNNING. try_to_wake_up() returns
* zero in this (rare) case, and we handle it by continuing to scan the queue.
*/
static inline void __wake_up_common(wait_queue_head_t *q, unsigned int mode, int nr_exclusive)
static inline void __wake_up_common(wait_queue_head_t *q, unsigned int mode, int nr_exclusive, int sync)
{
struct list_head *tmp;
unsigned int state;
......@@ -891,7 +914,7 @@ static inline void __wake_up_common(wait_queue_head_t *q, unsigned int mode, int
curr = list_entry(tmp, wait_queue_t, task_list);
p = curr->task;
state = p->state;
if ((state & mode) && try_to_wake_up(p) &&
if ((state & mode) && try_to_wake_up(p, sync) &&
((curr->flags & WQ_FLAG_EXCLUSIVE) && !--nr_exclusive))
break;
}
......@@ -905,17 +928,36 @@ void __wake_up(wait_queue_head_t *q, unsigned int mode, int nr_exclusive)
return;
spin_lock_irqsave(&q->lock, flags);
__wake_up_common(q, mode, nr_exclusive);
__wake_up_common(q, mode, nr_exclusive, 0);
spin_unlock_irqrestore(&q->lock, flags);
}
#if CONFIG_SMP
void __wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr_exclusive)
{
unsigned long flags;
if (unlikely(!q))
return;
spin_lock_irqsave(&q->lock, flags);
if (likely(nr_exclusive))
__wake_up_common(q, mode, nr_exclusive, 1);
else
__wake_up_common(q, mode, nr_exclusive, 0);
spin_unlock_irqrestore(&q->lock, flags);
}
#endif
void complete(struct completion *x)
{
unsigned long flags;
spin_lock_irqsave(&x->wait.lock, flags);
x->done++;
__wake_up_common(&x->wait, TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, 1);
__wake_up_common(&x->wait, TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, 1, 0);
spin_unlock_irqrestore(&x->wait.lock, flags);
}
......@@ -1342,8 +1384,7 @@ asmlinkage long sys_sched_yield(void)
runqueue_t *rq;
prio_array_t *array;
preempt_disable();
rq = this_rq();
rq = rq_lock(rq);
/*
* Decrease the yielding task's priority by one, to avoid
......@@ -1353,7 +1394,6 @@ asmlinkage long sys_sched_yield(void)
* If priority is already MAX_PRIO-1 then we still
* roundrobin the task within the runlist.
*/
spin_lock_irq(&rq->lock);
array = current->array;
/*
* If the task has reached maximum priority (or is a RT task)
......@@ -1370,8 +1410,7 @@ asmlinkage long sys_sched_yield(void)
list_add_tail(&current->run_list, array->queue + current->prio);
__set_bit(current->prio, array->bitmap);
}
spin_unlock(&rq->lock);
preempt_enable_no_resched();
spin_unlock_no_resched(&rq->lock);
schedule();
......@@ -1599,7 +1638,6 @@ void __init sched_init(void)
rq->active = rq->arrays;
rq->expired = rq->arrays + 1;
spin_lock_init(&rq->lock);
spin_lock_init(&rq->frozen);
INIT_LIST_HEAD(&rq->migration_queue);
for (j = 0; j < 2; j++) {
......
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