Messages in this thread Patch in this message | | | From | Tejun Heo <> | Subject | [PATCH 06/14] workqueue: unify local CPU queueing handling | Date | Fri, 3 Aug 2012 10:43:51 -0700 |
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Queueing functions have been using different methods to determine the local CPU.
* queue_work() superflously uses get/put_cpu() to acquire and hold the local CPU across queue_work_on().
* delayed_work_timer_fn() uses smp_processor_id().
* queue_delayed_work() calls queue_delayed_work_on() with -1 @cpu which is interpreted as the local CPU.
* flush_delayed_work[_sync]() were using raw_smp_processor_id().
* __queue_work() interprets %WORK_CPU_UNBOUND as local CPU if the target workqueue is bound one but nobody uses this.
This patch converts all functions to uniformly use %WORK_CPU_UNBOUND to indicate local CPU and use the local binding feature of __queue_work(). unlikely() is dropped from %WORK_CPU_UNBOUND handling in __queue_work().
Signed-off-by: Tejun Heo <tj@kernel.org> --- kernel/workqueue.c | 19 +++++++------------ 1 files changed, 7 insertions(+), 12 deletions(-)
diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 5539238..ce60bb5 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -1003,7 +1003,7 @@ static void __queue_work(unsigned int cpu, struct workqueue_struct *wq, if (!(wq->flags & WQ_UNBOUND)) { struct global_cwq *last_gcwq; - if (unlikely(cpu == WORK_CPU_UNBOUND)) + if (cpu == WORK_CPU_UNBOUND) cpu = raw_smp_processor_id(); /* @@ -1103,12 +1103,7 @@ EXPORT_SYMBOL_GPL(queue_work_on); */ bool queue_work(struct workqueue_struct *wq, struct work_struct *work) { - bool ret; - - ret = queue_work_on(get_cpu(), wq, work); - put_cpu(); - - return ret; + return queue_work_on(WORK_CPU_UNBOUND, wq, work); } EXPORT_SYMBOL_GPL(queue_work); @@ -1118,7 +1113,7 @@ void delayed_work_timer_fn(unsigned long __data) struct cpu_workqueue_struct *cwq = get_work_cwq(&dwork->work); local_irq_disable(); - __queue_work(smp_processor_id(), cwq->wq, &dwork->work); + __queue_work(WORK_CPU_UNBOUND, cwq->wq, &dwork->work); local_irq_enable(); } EXPORT_SYMBOL_GPL(delayed_work_timer_fn); @@ -1172,7 +1167,7 @@ bool queue_delayed_work_on(int cpu, struct workqueue_struct *wq, timer->expires = jiffies + delay; - if (unlikely(cpu >= 0)) + if (unlikely(cpu != WORK_CPU_UNBOUND)) add_timer_on(timer, cpu); else add_timer(timer); @@ -1198,7 +1193,7 @@ bool queue_delayed_work(struct workqueue_struct *wq, if (delay == 0) return queue_work(wq, &dwork->work); - return queue_delayed_work_on(-1, wq, dwork, delay); + return queue_delayed_work_on(WORK_CPU_UNBOUND, wq, dwork, delay); } EXPORT_SYMBOL_GPL(queue_delayed_work); @@ -2868,7 +2863,7 @@ bool flush_delayed_work(struct delayed_work *dwork) { local_irq_disable(); if (del_timer_sync(&dwork->timer)) - __queue_work(raw_smp_processor_id(), + __queue_work(WORK_CPU_UNBOUND, get_work_cwq(&dwork->work)->wq, &dwork->work); local_irq_enable(); return flush_work(&dwork->work); @@ -2891,7 +2886,7 @@ bool flush_delayed_work_sync(struct delayed_work *dwork) { local_irq_disable(); if (del_timer_sync(&dwork->timer)) - __queue_work(raw_smp_processor_id(), + __queue_work(WORK_CPU_UNBOUND, get_work_cwq(&dwork->work)->wq, &dwork->work); local_irq_enable(); return flush_work_sync(&dwork->work); -- 1.7.7.3
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