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workqueue: rename manager_mutex to assoc_mutex 

Now that manager_mutex's role has changed from synchronizing manager
role to excluding hotplug against manager, the name is misleading.

As it is protecting the CPU-association of the gcwq now, rename it to
assoc_mutex.

This patch is pure rename and doesn't introduce any functional change.

tj: Updated comments and description.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Lai Jiangshan 2012-09-18 09:59:23 -07:00 committed by Tejun Heo
parent 5f7dabfd5c
commit b2eb83d123
1 changed files with 19 additions and 19 deletions
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38
kernel/workqueue.c
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@ -58,7 +58,7 @@ enum {
* be executing on any CPU. The gcwq behaves as an unbound one.
*
* Note that DISASSOCIATED can be flipped only while holding
* managership of all pools on the gcwq to avoid changing binding
* assoc_mutex of all pools on the gcwq to avoid changing binding
* state while create_worker() is in progress.
*/
GCWQ_DISASSOCIATED = 1 << 0, /* cpu can't serve workers */
@ -165,7 +165,7 @@ struct worker_pool {
struct timer_list idle_timer; /* L: worker idle timeout */
struct timer_list mayday_timer; /* L: SOS timer for workers */
struct mutex manager_mutex; /* mutex manager should hold */
struct mutex assoc_mutex; /* protect GCWQ_DISASSOCIATED */
struct ida worker_ida; /* L: for worker IDs */
};
@ -1681,7 +1681,7 @@ static void rebind_workers(struct global_cwq *gcwq)
lockdep_assert_held(&gcwq->lock);
for_each_worker_pool(pool, gcwq)
lockdep_assert_held(&pool->manager_mutex);
lockdep_assert_held(&pool->assoc_mutex);
/* dequeue and kick idle ones */
for_each_worker_pool(pool, gcwq) {
@ -2081,22 +2081,22 @@ static bool manage_workers(struct worker *worker)
* grab %POOL_MANAGING_WORKERS to achieve this because that can
* lead to idle worker depletion (all become busy thinking someone
* else is managing) which in turn can result in deadlock under
* extreme circumstances. Use @pool->manager_mutex to synchronize
* extreme circumstances. Use @pool->assoc_mutex to synchronize
* manager against CPU hotplug.
*
* manager_mutex would always be free unless CPU hotplug is in
* assoc_mutex would always be free unless CPU hotplug is in
* progress. trylock first without dropping @gcwq->lock.
*/
if (unlikely(!mutex_trylock(&pool->manager_mutex))) {
if (unlikely(!mutex_trylock(&pool->assoc_mutex))) {
spin_unlock_irq(&pool->gcwq->lock);
mutex_lock(&pool->manager_mutex);
mutex_lock(&pool->assoc_mutex);
/*
* CPU hotplug could have happened while we were waiting
* for manager_mutex. Hotplug itself can't handle us
* for assoc_mutex. Hotplug itself can't handle us
* because manager isn't either on idle or busy list, and
* @gcwq's state and ours could have deviated.
*
* As hotplug is now excluded via manager_mutex, we can
* As hotplug is now excluded via assoc_mutex, we can
* simply try to bind. It will succeed or fail depending
* on @gcwq's current state. Try it and adjust
* %WORKER_UNBOUND accordingly.
@ -2119,7 +2119,7 @@ static bool manage_workers(struct worker *worker)
ret |= maybe_create_worker(pool);
pool->flags &= ~POOL_MANAGING_WORKERS;
mutex_unlock(&pool->manager_mutex);
mutex_unlock(&pool->assoc_mutex);
return ret;
}
@ -3474,23 +3474,23 @@ EXPORT_SYMBOL_GPL(work_busy);
*/
/* claim manager positions of all pools */
static void gcwq_claim_management_and_lock(struct global_cwq *gcwq)
static void gcwq_claim_assoc_and_lock(struct global_cwq *gcwq)
{
struct worker_pool *pool;
for_each_worker_pool(pool, gcwq)
mutex_lock_nested(&pool->manager_mutex, pool - gcwq->pools);
mutex_lock_nested(&pool->assoc_mutex, pool - gcwq->pools);
spin_lock_irq(&gcwq->lock);
}
/* release manager positions */
static void gcwq_release_management_and_unlock(struct global_cwq *gcwq)
static void gcwq_release_assoc_and_unlock(struct global_cwq *gcwq)
{
struct worker_pool *pool;
spin_unlock_irq(&gcwq->lock);
for_each_worker_pool(pool, gcwq)
mutex_unlock(&pool->manager_mutex);
mutex_unlock(&pool->assoc_mutex);
}
static void gcwq_unbind_fn(struct work_struct *work)
@ -3503,7 +3503,7 @@ static void gcwq_unbind_fn(struct work_struct *work)
BUG_ON(gcwq->cpu != smp_processor_id());
gcwq_claim_management_and_lock(gcwq);
gcwq_claim_assoc_and_lock(gcwq);
/*
* We've claimed all manager positions. Make all workers unbound
@ -3520,7 +3520,7 @@ static void gcwq_unbind_fn(struct work_struct *work)
gcwq->flags |= GCWQ_DISASSOCIATED;
gcwq_release_management_and_unlock(gcwq);
gcwq_release_assoc_and_unlock(gcwq);
/*
* Call schedule() so that we cross rq->lock and thus can guarantee
@ -3576,10 +3576,10 @@ static int __devinit workqueue_cpu_up_callback(struct notifier_block *nfb,
case CPU_DOWN_FAILED:
case CPU_ONLINE:
gcwq_claim_management_and_lock(gcwq);
gcwq_claim_assoc_and_lock(gcwq);
gcwq->flags &= ~GCWQ_DISASSOCIATED;
rebind_workers(gcwq);
gcwq_release_management_and_unlock(gcwq);
gcwq_release_assoc_and_unlock(gcwq);
break;
}
return NOTIFY_OK;
@ -3833,7 +3833,7 @@ static int __init init_workqueues(void)
setup_timer(&pool->mayday_timer, gcwq_mayday_timeout,
(unsigned long)pool);
mutex_init(&pool->manager_mutex);
mutex_init(&pool->assoc_mutex);
ida_init(&pool->worker_ida);
}
}