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Date: Sat, 15 Sep 2012 16:13:37 +0800
From: Lai Jiangshan <laijs@...fujitsu.com>
To: Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org
Cc: Lai Jiangshan <laijs@...fujitsu.com>
Subject: [PATCH 4/6] workqueue: rename manager_mutex to assoc_mutex
We can't known what is being protected from the name of
manager_mutex or be misled by the name.
Actually, it protects the CPU-association of the gcwq,
rename it to assoc_mutex will be better.
Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---
kernel/workqueue.c | 40 ++++++++++++++++++++--------------------
1 files changed, 20 insertions(+), 20 deletions(-)
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index bc846b1..5438c0d 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -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 */
};
@@ -1672,7 +1672,7 @@ 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);
/* exile and kick idle ones */
for_each_worker_pool(pool, gcwq) {
@@ -2061,26 +2061,26 @@ static bool manage_workers(struct worker *worker)
/*
* To simplify both worker management and CPU hotplug, hold off
- * management while hotplug is in progress. CPU hotplug path can't
+ * assoc_mutex while management is in progress. CPU hotplug path can't
* 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.
@@ -2103,7 +2103,7 @@ 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;
}
@@ -3458,23 +3458,23 @@ 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)
@@ -3487,7 +3487,7 @@ 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
@@ -3504,7 +3504,7 @@ 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
@@ -3560,10 +3560,10 @@ 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;
@@ -3817,7 +3817,7 @@ 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);
}
}
--
1.7.4.4
--
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