struct wq_device *wq_dev; /* I: for sysfs interface */
#endif
#ifdef CONFIG_LOCKDEP
+ char *lock_name;
+ struct lock_class_key key;
struct lockdep_map lockdep_map;
#endif
char name[WQ_NAME_LEN]; /* I: workqueue name */
* The following mb guarantees that previous clear of a PENDING bit
* will not be reordered with any speculative LOADS or STORES from
* work->current_func, which is executed afterwards. This possible
- * reordering can lead to a missed execution on attempt to qeueue
+ * reordering can lead to a missed execution on attempt to queue
* the same @work. E.g. consider this case:
*
* CPU#0 CPU#1
worker = current_wq_worker();
/*
- * Return %true iff I'm a worker execuing a work item on @wq. If
+ * Return %true iff I'm a worker executing a work item on @wq. If
* I'm @worker, it's safe to dereference it without locking.
*/
return worker && worker->current_pwq->wq == wq;
}
EXPORT_SYMBOL(queue_work_on);
+/**
+ * workqueue_select_cpu_near - Select a CPU based on NUMA node
+ * @node: NUMA node ID that we want to select a CPU from
+ *
+ * This function will attempt to find a "random" cpu available on a given
+ * node. If there are no CPUs available on the given node it will return
+ * WORK_CPU_UNBOUND indicating that we should just schedule to any
+ * available CPU if we need to schedule this work.
+ */
+static int workqueue_select_cpu_near(int node)
+{
+ int cpu;
+
+ /* No point in doing this if NUMA isn't enabled for workqueues */
+ if (!wq_numa_enabled)
+ return WORK_CPU_UNBOUND;
+
+ /* Delay binding to CPU if node is not valid or online */
+ if (node < 0 || node >= MAX_NUMNODES || !node_online(node))
+ return WORK_CPU_UNBOUND;
+
+ /* Use local node/cpu if we are already there */
+ cpu = raw_smp_processor_id();
+ if (node == cpu_to_node(cpu))
+ return cpu;
+
+ /* Use "random" otherwise know as "first" online CPU of node */
+ cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask);
+
+ /* If CPU is valid return that, otherwise just defer */
+ return cpu < nr_cpu_ids ? cpu : WORK_CPU_UNBOUND;
+}
+
+/**
+ * queue_work_node - queue work on a "random" cpu for a given NUMA node
+ * @node: NUMA node that we are targeting the work for
+ * @wq: workqueue to use
+ * @work: work to queue
+ *
+ * We queue the work to a "random" CPU within a given NUMA node. The basic
+ * idea here is to provide a way to somehow associate work with a given
+ * NUMA node.
+ *
+ * This function will only make a best effort attempt at getting this onto
+ * the right NUMA node. If no node is requested or the requested node is
+ * offline then we just fall back to standard queue_work behavior.
+ *
+ * Currently the "random" CPU ends up being the first available CPU in the
+ * intersection of cpu_online_mask and the cpumask of the node, unless we
+ * are running on the node. In that case we just use the current CPU.
+ *
+ * Return: %false if @work was already on a queue, %true otherwise.
+ */
+bool queue_work_node(int node, struct workqueue_struct *wq,
+ struct work_struct *work)
+{
+ unsigned long flags;
+ bool ret = false;
+
+ /*
+ * This current implementation is specific to unbound workqueues.
+ * Specifically we only return the first available CPU for a given
+ * node instead of cycling through individual CPUs within the node.
+ *
+ * If this is used with a per-cpu workqueue then the logic in
+ * workqueue_select_cpu_near would need to be updated to allow for
+ * some round robin type logic.
+ */
+ WARN_ON_ONCE(!(wq->flags & WQ_UNBOUND));
+
+ local_irq_save(flags);
+
+ if (!test_and_set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))) {
+ int cpu = workqueue_select_cpu_near(node);
+
+ __queue_work(cpu, wq, work);
+ ret = true;
+ }
+
+ local_irq_restore(flags);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(queue_work_node);
+
void delayed_work_timer_fn(struct timer_list *t)
{
struct delayed_work *dwork = from_timer(dwork, t, timer);
*
* Return: %false if @rwork was already pending, %true otherwise. Note
* that a full RCU grace period is guaranteed only after a %true return.
- * While @rwork is guarnateed to be executed after a %false return, the
+ * While @rwork is guaranteed to be executed after a %false return, the
* execution may happen before a full RCU grace period has passed.
*/
bool queue_rcu_work(struct workqueue_struct *wq, struct rcu_work *rwork)
if (WARN_ON(!wq_online))
return false;
+ if (WARN_ON(!work->func))
+ return false;
+
if (!from_cancel) {
lock_map_acquire(&work->lockdep_map);
lock_map_release(&work->lockdep_map);
return 0;
}
+#ifdef CONFIG_LOCKDEP
+static void wq_init_lockdep(struct workqueue_struct *wq)
+{
+ char *lock_name;
+
+ lockdep_register_key(&wq->key);
+ lock_name = kasprintf(GFP_KERNEL, "%s%s", "(wq_completion)", wq->name);
+ if (!lock_name)
+ lock_name = wq->name;
+ lockdep_init_map(&wq->lockdep_map, lock_name, &wq->key, 0);
+}
+
+static void wq_unregister_lockdep(struct workqueue_struct *wq)
+{
+ lockdep_unregister_key(&wq->key);
+}
+
+static void wq_free_lockdep(struct workqueue_struct *wq)
+{
+ if (wq->lock_name != wq->name)
+ kfree(wq->lock_name);
+}
+#else
+static void wq_init_lockdep(struct workqueue_struct *wq)
+{
+}
+
+static void wq_unregister_lockdep(struct workqueue_struct *wq)
+{
+}
+
+static void wq_free_lockdep(struct workqueue_struct *wq)
+{
+}
+#endif
+
static void rcu_free_wq(struct rcu_head *rcu)
{
struct workqueue_struct *wq =
container_of(rcu, struct workqueue_struct, rcu);
+ wq_free_lockdep(wq);
+
if (!(wq->flags & WQ_UNBOUND))
free_percpu(wq->cpu_pwqs);
else
* If we're the last pwq going away, @wq is already dead and no one
* is gonna access it anymore. Schedule RCU free.
*/
- if (is_last)
+ if (is_last) {
+ wq_unregister_lockdep(wq);
call_rcu(&wq->rcu, rcu_free_wq);
+ }
}
/**
return 0;
}
-struct workqueue_struct *__alloc_workqueue_key(const char *fmt,
- unsigned int flags,
- int max_active,
- struct lock_class_key *key,
- const char *lock_name, ...)
+struct workqueue_struct *alloc_workqueue(const char *fmt,
+ unsigned int flags,
+ int max_active, ...)
{
size_t tbl_size = 0;
va_list args;
goto err_free_wq;
}
- va_start(args, lock_name);
+ va_start(args, max_active);
vsnprintf(wq->name, sizeof(wq->name), fmt, args);
va_end(args);
INIT_LIST_HEAD(&wq->flusher_overflow);
INIT_LIST_HEAD(&wq->maydays);
- lockdep_init_map(&wq->lockdep_map, lock_name, key, 0);
+ wq_init_lockdep(wq);
INIT_LIST_HEAD(&wq->list);
if (alloc_and_link_pwqs(wq) < 0)
destroy_workqueue(wq);
return NULL;
}
-EXPORT_SYMBOL_GPL(__alloc_workqueue_key);
+EXPORT_SYMBOL_GPL(alloc_workqueue);
/**
* destroy_workqueue - safely terminate a workqueue
kthread_stop(wq->rescuer->task);
if (!(wq->flags & WQ_UNBOUND)) {
+ wq_unregister_lockdep(wq);
/*
* The base ref is never dropped on per-cpu pwqs. Directly
* schedule RCU free.
git.samba.org / sfrench / cifs-2.6.git / blobdiff