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pm: introduce new interfaces schedule_work_on() and queue_work_on()

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This interface allows adding a job on a specific cpu.

Although a work struct on a cpu will be scheduled to other cpu if the cpu
dies, there is a recursion if a work task tries to offline the cpu it's
running on.  we need to schedule the task to a specific cpu in this case.
http://bugzilla.kernel.org/show_bug.cgi?id=10897

[oleg@tv-sign.ru: cleanups]
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Tested-by: Rus <harbour@sfinx.od.ua>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Zhang Rui 2008-07-23 21:28:39 -07:00 committed by Linus Torvalds
parent 0d83304c7e
commit c1a220e7ac
2 changed files with 41 additions and 1 deletions
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3
include/linux/workqueue.h
View file

@ -179,6 +179,8 @@ __create_workqueue_key(const char *name, int singlethread,
extern void destroy_workqueue(struct workqueue_struct *wq);
extern int queue_work(struct workqueue_struct *wq, struct work_struct *work);
extern int queue_work_on(int cpu, struct workqueue_struct *wq,
struct work_struct *work);
extern int queue_delayed_work(struct workqueue_struct *wq,
struct delayed_work *work, unsigned long delay);
extern int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
@ -188,6 +190,7 @@ extern void flush_workqueue(struct workqueue_struct *wq);
extern void flush_scheduled_work(void);
extern int schedule_work(struct work_struct *work);
extern int schedule_work_on(int cpu, struct work_struct *work);
extern int schedule_delayed_work(struct delayed_work *work, unsigned long delay);
extern int schedule_delayed_work_on(int cpu, struct delayed_work *work,
unsigned long delay);

39
kernel/workqueue.c
View file

@ -140,7 +140,6 @@ static void insert_work(struct cpu_workqueue_struct *cwq,
wake_up(&cwq->more_work);
}
/* Preempt must be disabled. */
static void __queue_work(struct cpu_workqueue_struct *cwq,
struct work_struct *work)
{
@ -175,6 +174,31 @@ int queue_work(struct workqueue_struct *wq, struct work_struct *work)
}
EXPORT_SYMBOL_GPL(queue_work);
/**
* queue_work_on - queue work on specific cpu
* @cpu: CPU number to execute work on
* @wq: workqueue to use
* @work: work to queue
*
* Returns 0 if @work was already on a queue, non-zero otherwise.
*
* We queue the work to a specific CPU, the caller must ensure it
* can't go away.
*/
int
queue_work_on(int cpu, struct workqueue_struct *wq, struct work_struct *work)
{
int ret = 0;
if (!test_and_set_bit(WORK_STRUCT_PENDING, work_data_bits(work))) {
BUG_ON(!list_empty(&work->entry));
__queue_work(wq_per_cpu(wq, cpu), work);
ret = 1;
}
return ret;
}
EXPORT_SYMBOL_GPL(queue_work_on);
static void delayed_work_timer_fn(unsigned long __data)
{
struct delayed_work *dwork = (struct delayed_work *)__data;
@ -553,6 +577,19 @@ int schedule_work(struct work_struct *work)
}
EXPORT_SYMBOL(schedule_work);
/*
* schedule_work_on - put work task on a specific cpu
* @cpu: cpu to put the work task on
* @work: job to be done
*
* This puts a job on a specific cpu
*/
int schedule_work_on(int cpu, struct work_struct *work)
{
return queue_work_on(cpu, keventd_wq, work);
}
EXPORT_SYMBOL(schedule_work_on);
/**
* schedule_delayed_work - put work task in global workqueue after delay
* @dwork: job to be done