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Message-Id: <1364453020-2829-10-git-send-email-tj@kernel.org>
Date: Wed, 27 Mar 2013 23:43:35 -0700
From: Tejun Heo <tj@...nel.org>
To: laijs@...fujitsu.com
Cc: axboe@...nel.dk, jack@...e.cz, fengguang.wu@...el.com,
jmoyer@...hat.com, zab@...hat.com, linux-kernel@...r.kernel.org,
herbert@...dor.apana.org.au, davem@...emloft.net,
linux-crypto@...r.kernel.org, Tejun Heo <tj@...nel.org>
Subject: [PATCH 09/14] workqueue: break init_and_link_pwq() into two functions and introduce alloc_unbound_pwq()
Break init_and_link_pwq() into init_pwq() and link_pwq() and move
unbound-workqueue specific handling into apply_workqueue_attrs().
Also, factor out unbound pool and pool_workqueue allocation into
alloc_unbound_pwq().
This reorganization is to prepare for NUMA affinity and doesn't
introduce any functional changes.
Signed-off-by: Tejun Heo <tj@...nel.org>
---
kernel/workqueue.c | 77 ++++++++++++++++++++++++++++++++++--------------------
1 file changed, 49 insertions(+), 28 deletions(-)
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 5b53705..58c7663 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -3626,13 +3626,10 @@ static void pwq_adjust_max_active(struct pool_workqueue *pwq)
spin_unlock_irq(&pwq->pool->lock);
}
-static void init_and_link_pwq(struct pool_workqueue *pwq,
- struct workqueue_struct *wq,
- struct worker_pool *pool,
- struct pool_workqueue **p_last_pwq)
+/* initialize newly zalloced @pwq which is associated with @wq and @pool */
+static void init_pwq(struct pool_workqueue *pwq, struct workqueue_struct *wq,
+ struct worker_pool *pool)
{
- int node;
-
BUG_ON((unsigned long)pwq & WORK_STRUCT_FLAG_MASK);
pwq->pool = pool;
@@ -3642,8 +3639,15 @@ static void init_and_link_pwq(struct pool_workqueue *pwq,
INIT_LIST_HEAD(&pwq->delayed_works);
INIT_LIST_HEAD(&pwq->mayday_node);
INIT_WORK(&pwq->unbound_release_work, pwq_unbound_release_workfn);
+}
- mutex_lock(&wq->mutex);
+/* sync @pwq with the current state of its associated wq and link it */
+static void link_pwq(struct pool_workqueue *pwq,
+ struct pool_workqueue **p_last_pwq)
+{
+ struct workqueue_struct *wq = pwq->wq;
+
+ lockdep_assert_held(&wq->mutex);
/*
* Set the matching work_color. This is synchronized with
@@ -3658,14 +3662,29 @@ static void init_and_link_pwq(struct pool_workqueue *pwq,
/* link in @pwq */
list_add_rcu(&pwq->pwqs_node, &wq->pwqs);
+}
- if (wq->flags & WQ_UNBOUND) {
- copy_workqueue_attrs(wq->unbound_attrs, pool->attrs);
- for_each_node(node)
- rcu_assign_pointer(wq->numa_pwq_tbl[node], pwq);
+/* obtain a pool matching @attr and create a pwq associating the pool and @wq */
+static struct pool_workqueue *alloc_unbound_pwq(struct workqueue_struct *wq,
+ const struct workqueue_attrs *attrs)
+{
+ struct worker_pool *pool;
+ struct pool_workqueue *pwq;
+
+ lockdep_assert_held(&wq_pool_mutex);
+
+ pool = get_unbound_pool(attrs);
+ if (!pool)
+ return NULL;
+
+ pwq = kmem_cache_zalloc(pwq_cache, GFP_KERNEL);
+ if (!pwq) {
+ put_unbound_pool(pool);
+ return NULL;
}
- mutex_unlock(&wq->mutex);
+ init_pwq(pwq, wq, pool);
+ return pwq;
}
/**
@@ -3686,8 +3705,8 @@ int apply_workqueue_attrs(struct workqueue_struct *wq,
const struct workqueue_attrs *attrs)
{
struct workqueue_attrs *new_attrs;
- struct pool_workqueue *pwq = NULL, *last_pwq;
- struct worker_pool *pool;
+ struct pool_workqueue *pwq, *last_pwq;
+ int node;
/* only unbound workqueues can change attributes */
if (WARN_ON(!(wq->flags & WQ_UNBOUND)))
@@ -3706,22 +3725,21 @@ int apply_workqueue_attrs(struct workqueue_struct *wq,
cpumask_and(new_attrs->cpumask, new_attrs->cpumask, cpu_possible_mask);
mutex_lock(&wq_pool_mutex);
-
- pwq = kmem_cache_zalloc(pwq_cache, GFP_KERNEL);
- if (!pwq) {
- mutex_unlock(&wq_pool_mutex);
+ pwq = alloc_unbound_pwq(wq, new_attrs);
+ mutex_unlock(&wq_pool_mutex);
+ if (!pwq)
goto enomem;
- }
- pool = get_unbound_pool(new_attrs);
- if (!pool) {
- mutex_unlock(&wq_pool_mutex);
- goto enomem;
- }
+ mutex_lock(&wq->mutex);
- mutex_unlock(&wq_pool_mutex);
+ link_pwq(pwq, &last_pwq);
+
+ copy_workqueue_attrs(wq->unbound_attrs, new_attrs);
+ for_each_node(node)
+ rcu_assign_pointer(wq->numa_pwq_tbl[node], pwq);
+
+ mutex_unlock(&wq->mutex);
- init_and_link_pwq(pwq, wq, pool, &last_pwq);
if (last_pwq) {
spin_lock_irq(&last_pwq->pool->lock);
put_pwq(last_pwq);
@@ -3731,7 +3749,6 @@ int apply_workqueue_attrs(struct workqueue_struct *wq,
return 0;
enomem:
- kmem_cache_free(pwq_cache, pwq);
free_workqueue_attrs(new_attrs);
return -ENOMEM;
}
@@ -3752,7 +3769,11 @@ static int alloc_and_link_pwqs(struct workqueue_struct *wq)
struct worker_pool *cpu_pools =
per_cpu(cpu_worker_pools, cpu);
- init_and_link_pwq(pwq, wq, &cpu_pools[highpri], NULL);
+ init_pwq(pwq, wq, &cpu_pools[highpri]);
+
+ mutex_lock(&wq->mutex);
+ link_pwq(pwq, NULL);
+ mutex_unlock(&wq->mutex);
}
return 0;
} else {
--
1.8.1.4
--
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