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authorLinus Torvalds <torvalds@linux-foundation.org>2014-08-04 10:04:44 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-08-04 10:04:44 -0700
commitc4c3f5fba01e189fb3618f09545abdb4cf8ec8ee (patch)
tree2939a5d998104ddd5d68b44337956f668f2d701a /kernel/workqueue.c
parent1bff598860f535e525c2a549f7f584ae7cc3fc1c (diff)
parent95847e1bd34c0de86039408b24a05f07e788061d (diff)
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Merge branch 'for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
Pull workqueue updates from Tejun Heo: "Lai has been doing a lot of cleanups of workqueue and kthread_work. No significant behavior change. Just a lot of cleanups all over the place. Some are a bit invasive but overall nothing too dangerous" * 'for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq: kthread_work: remove the unused wait_queue_head kthread_work: wake up worker only when the worker is idle workqueue: use nr_node_ids instead of wq_numa_tbl_len workqueue: remove the misnamed out_unlock label in get_unbound_pool() workqueue: remove the stale comment in pwq_unbound_release_workfn() workqueue: move rescuer pool detachment to the end workqueue: unfold start_worker() into create_worker() workqueue: remove @wakeup from worker_set_flags() workqueue: remove an unneeded UNBOUND test before waking up the next worker workqueue: wake regular worker if need_more_worker() when rescuer leave the pool workqueue: alloc struct worker on its local node workqueue: reuse the already calculated pwq in try_to_grab_pending() workqueue: stronger test in process_one_work() workqueue: clear POOL_DISASSOCIATED in rebind_workers() workqueue: sanity check pool->cpu in wq_worker_sleeping() workqueue: clear leftover flags when detached workqueue: remove useless WARN_ON_ONCE() workqueue: use schedule_timeout_interruptible() instead of open code workqueue: remove the empty check in too_many_workers() workqueue: use "pool->cpu < 0" to stand for an unbound pool
Diffstat (limited to 'kernel/workqueue.c')
-rw-r--r--kernel/workqueue.c200
1 files changed, 61 insertions, 139 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 35974ac69600..7a2e449a96b1 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -265,7 +265,6 @@ struct workqueue_struct {
static struct kmem_cache *pwq_cache;
-static int wq_numa_tbl_len; /* highest possible NUMA node id + 1 */
static cpumask_var_t *wq_numa_possible_cpumask;
/* possible CPUs of each node */
@@ -758,13 +757,6 @@ static bool too_many_workers(struct worker_pool *pool)
int nr_idle = pool->nr_idle + managing; /* manager is considered idle */
int nr_busy = pool->nr_workers - nr_idle;
- /*
- * nr_idle and idle_list may disagree if idle rebinding is in
- * progress. Never return %true if idle_list is empty.
- */
- if (list_empty(&pool->idle_list))
- return false;
-
return nr_idle > 2 && (nr_idle - 2) * MAX_IDLE_WORKERS_RATIO >= nr_busy;
}
@@ -850,7 +842,7 @@ struct task_struct *wq_worker_sleeping(struct task_struct *task, int cpu)
pool = worker->pool;
/* this can only happen on the local cpu */
- if (WARN_ON_ONCE(cpu != raw_smp_processor_id()))
+ if (WARN_ON_ONCE(cpu != raw_smp_processor_id() || pool->cpu != cpu))
return NULL;
/*
@@ -874,35 +866,22 @@ struct task_struct *wq_worker_sleeping(struct task_struct *task, int cpu)
* worker_set_flags - set worker flags and adjust nr_running accordingly
* @worker: self
* @flags: flags to set
- * @wakeup: wakeup an idle worker if necessary
*
- * Set @flags in @worker->flags and adjust nr_running accordingly. If
- * nr_running becomes zero and @wakeup is %true, an idle worker is
- * woken up.
+ * Set @flags in @worker->flags and adjust nr_running accordingly.
*
* CONTEXT:
* spin_lock_irq(pool->lock)
*/
-static inline void worker_set_flags(struct worker *worker, unsigned int flags,
- bool wakeup)
+static inline void worker_set_flags(struct worker *worker, unsigned int flags)
{
struct worker_pool *pool = worker->pool;
WARN_ON_ONCE(worker->task != current);
- /*
- * If transitioning into NOT_RUNNING, adjust nr_running and
- * wake up an idle worker as necessary if requested by
- * @wakeup.
- */
+ /* If transitioning into NOT_RUNNING, adjust nr_running. */
if ((flags & WORKER_NOT_RUNNING) &&
!(worker->flags & WORKER_NOT_RUNNING)) {
- if (wakeup) {
- if (atomic_dec_and_test(&pool->nr_running) &&
- !list_empty(&pool->worklist))
- wake_up_worker(pool);
- } else
- atomic_dec(&pool->nr_running);
+ atomic_dec(&pool->nr_running);
}
worker->flags |= flags;
@@ -1232,7 +1211,7 @@ static int try_to_grab_pending(struct work_struct *work, bool is_dwork,
pwq_activate_delayed_work(work);
list_del_init(&work->entry);
- pwq_dec_nr_in_flight(get_work_pwq(work), get_work_color(work));
+ pwq_dec_nr_in_flight(pwq, get_work_color(work));
/* work->data points to pwq iff queued, point to pool */
set_work_pool_and_keep_pending(work, pool->id);
@@ -1560,7 +1539,7 @@ static void worker_enter_idle(struct worker *worker)
(worker->hentry.next || worker->hentry.pprev)))
return;
- /* can't use worker_set_flags(), also called from start_worker() */
+ /* can't use worker_set_flags(), also called from create_worker() */
worker->flags |= WORKER_IDLE;
pool->nr_idle++;
worker->last_active = jiffies;
@@ -1602,11 +1581,11 @@ static void worker_leave_idle(struct worker *worker)
list_del_init(&worker->entry);
}
-static struct worker *alloc_worker(void)
+static struct worker *alloc_worker(int node)
{
struct worker *worker;
- worker = kzalloc(sizeof(*worker), GFP_KERNEL);
+ worker = kzalloc_node(sizeof(*worker), GFP_KERNEL, node);
if (worker) {
INIT_LIST_HEAD(&worker->entry);
INIT_LIST_HEAD(&worker->scheduled);
@@ -1670,6 +1649,9 @@ static void worker_detach_from_pool(struct worker *worker,
detach_completion = pool->detach_completion;
mutex_unlock(&pool->attach_mutex);
+ /* clear leftover flags without pool->lock after it is detached */
+ worker->flags &= ~(WORKER_UNBOUND | WORKER_REBOUND);
+
if (detach_completion)
complete(detach_completion);
}
@@ -1678,8 +1660,7 @@ static void worker_detach_from_pool(struct worker *worker,
* create_worker - create a new workqueue worker
* @pool: pool the new worker will belong to
*
- * Create a new worker which is attached to @pool. The new worker must be
- * started by start_worker().
+ * Create and start a new worker which is attached to @pool.
*
* CONTEXT:
* Might sleep. Does GFP_KERNEL allocations.
@@ -1698,7 +1679,7 @@ static struct worker *create_worker(struct worker_pool *pool)
if (id < 0)
goto fail;
- worker = alloc_worker();
+ worker = alloc_worker(pool->node);
if (!worker)
goto fail;
@@ -1724,6 +1705,13 @@ static struct worker *create_worker(struct worker_pool *pool)
/* successful, attach the worker to the pool */
worker_attach_to_pool(worker, pool);
+ /* start the newly created worker */
+ spin_lock_irq(&pool->lock);
+ worker->pool->nr_workers++;
+ worker_enter_idle(worker);
+ wake_up_process(worker->task);
+ spin_unlock_irq(&pool->lock);
+
return worker;
fail:
@@ -1734,44 +1722,6 @@ fail:
}
/**
- * start_worker - start a newly created worker
- * @worker: worker to start
- *
- * Make the pool aware of @worker and start it.
- *
- * CONTEXT:
- * spin_lock_irq(pool->lock).
- */
-static void start_worker(struct worker *worker)
-{
- worker->pool->nr_workers++;
- worker_enter_idle(worker);
- wake_up_process(worker->task);
-}
-
-/**
- * create_and_start_worker - create and start a worker for a pool
- * @pool: the target pool
- *
- * Grab the managership of @pool and create and start a new worker for it.
- *
- * Return: 0 on success. A negative error code otherwise.
- */
-static int create_and_start_worker(struct worker_pool *pool)
-{
- struct worker *worker;
-
- worker = create_worker(pool);
- if (worker) {
- spin_lock_irq(&pool->lock);
- start_worker(worker);
- spin_unlock_irq(&pool->lock);
- }
-
- return worker ? 0 : -ENOMEM;
-}
-
-/**
* destroy_worker - destroy a workqueue worker
* @worker: worker to be destroyed
*
@@ -1909,23 +1859,10 @@ restart:
mod_timer(&pool->mayday_timer, jiffies + MAYDAY_INITIAL_TIMEOUT);
while (true) {
- struct worker *worker;
-
- worker = create_worker(pool);
- if (worker) {
- del_timer_sync(&pool->mayday_timer);
- spin_lock_irq(&pool->lock);
- start_worker(worker);
- if (WARN_ON_ONCE(need_to_create_worker(pool)))
- goto restart;
- return true;
- }
-
- if (!need_to_create_worker(pool))
+ if (create_worker(pool) || !need_to_create_worker(pool))
break;
- __set_current_state(TASK_INTERRUPTIBLE);
- schedule_timeout(CREATE_COOLDOWN);
+ schedule_timeout_interruptible(CREATE_COOLDOWN);
if (!need_to_create_worker(pool))
break;
@@ -1933,6 +1870,11 @@ restart:
del_timer_sync(&pool->mayday_timer);
spin_lock_irq(&pool->lock);
+ /*
+ * This is necessary even after a new worker was just successfully
+ * created as @pool->lock was dropped and the new worker might have
+ * already become busy.
+ */
if (need_to_create_worker(pool))
goto restart;
return true;
@@ -2020,13 +1962,7 @@ __acquires(&pool->lock)
lockdep_copy_map(&lockdep_map, &work->lockdep_map);
#endif
- /*
- * Ensure we're on the correct CPU. DISASSOCIATED test is
- * necessary to avoid spurious warnings from rescuers servicing the
- * unbound or a disassociated pool.
- */
- WARN_ON_ONCE(!(worker->flags & WORKER_UNBOUND) &&
- !(pool->flags & POOL_DISASSOCIATED) &&
+ WARN_ON_ONCE(!(pool->flags & POOL_DISASSOCIATED) &&
raw_smp_processor_id() != pool->cpu);
/*
@@ -2052,17 +1988,22 @@ __acquires(&pool->lock)
list_del_init(&work->entry);
/*
- * CPU intensive works don't participate in concurrency
- * management. They're the scheduler's responsibility.
+ * CPU intensive works don't participate in concurrency management.
+ * They're the scheduler's responsibility. This takes @worker out
+ * of concurrency management and the next code block will chain
+ * execution of the pending work items.
*/
if (unlikely(cpu_intensive))
- worker_set_flags(worker, WORKER_CPU_INTENSIVE, true);
+ worker_set_flags(worker, WORKER_CPU_INTENSIVE);
/*
- * Unbound pool isn't concurrency managed and work items should be
- * executed ASAP. Wake up another worker if necessary.
+ * Wake up another worker if necessary. The condition is always
+ * false for normal per-cpu workers since nr_running would always
+ * be >= 1 at this point. This is used to chain execution of the
+ * pending work items for WORKER_NOT_RUNNING workers such as the
+ * UNBOUND and CPU_INTENSIVE ones.
*/
- if ((worker->flags & WORKER_UNBOUND) && need_more_worker(pool))
+ if (need_more_worker(pool))
wake_up_worker(pool);
/*
@@ -2218,7 +2159,7 @@ recheck:
}
} while (keep_working(pool));
- worker_set_flags(worker, WORKER_PREP, false);
+ worker_set_flags(worker, WORKER_PREP);
sleep:
/*
* pool->lock is held and there's no work to process and no need to
@@ -2311,29 +2252,27 @@ repeat:
move_linked_works(work, scheduled, &n);
process_scheduled_works(rescuer);
- spin_unlock_irq(&pool->lock);
-
- worker_detach_from_pool(rescuer, pool);
-
- spin_lock_irq(&pool->lock);
/*
* Put the reference grabbed by send_mayday(). @pool won't
- * go away while we're holding its lock.
+ * go away while we're still attached to it.
*/
put_pwq(pwq);
/*
- * Leave this pool. If keep_working() is %true, notify a
+ * Leave this pool. If need_more_worker() is %true, notify a
* regular worker; otherwise, we end up with 0 concurrency
* and stalling the execution.
*/
- if (keep_working(pool))
+ if (need_more_worker(pool))
wake_up_worker(pool);
rescuer->pool = NULL;
- spin_unlock(&pool->lock);
- spin_lock(&wq_mayday_lock);
+ spin_unlock_irq(&pool->lock);
+
+ worker_detach_from_pool(rescuer, pool);
+
+ spin_lock_irq(&wq_mayday_lock);
}
spin_unlock_irq(&wq_mayday_lock);
@@ -3458,7 +3397,7 @@ static void put_unbound_pool(struct worker_pool *pool)
return;
/* sanity checks */
- if (WARN_ON(!(pool->flags & POOL_DISASSOCIATED)) ||
+ if (WARN_ON(!(pool->cpu < 0)) ||
WARN_ON(!list_empty(&pool->worklist)))
return;
@@ -3524,7 +3463,7 @@ static struct worker_pool *get_unbound_pool(const struct workqueue_attrs *attrs)
hash_for_each_possible(unbound_pool_hash, pool, hash_node, hash) {
if (wqattrs_equal(pool->attrs, attrs)) {
pool->refcnt++;
- goto out_unlock;
+ return pool;
}
}
@@ -3557,12 +3496,12 @@ static struct worker_pool *get_unbound_pool(const struct workqueue_attrs *attrs)
goto fail;
/* create and start the initial worker */
- if (create_and_start_worker(pool) < 0)
+ if (!create_worker(pool))
goto fail;
/* install */
hash_add(unbound_pool_hash, &pool->hash_node, hash);
-out_unlock:
+
return pool;
fail:
if (pool)
@@ -3591,11 +3530,6 @@ static void pwq_unbound_release_workfn(struct work_struct *work)
if (WARN_ON_ONCE(!(wq->flags & WQ_UNBOUND)))
return;
- /*
- * Unlink @pwq. Synchronization against wq->mutex isn't strictly
- * necessary on release but do it anyway. It's easier to verify
- * and consistent with the linking path.
- */
mutex_lock(&wq->mutex);
list_del_rcu(&pwq->pwqs_node);
is_last = list_empty(&wq->pwqs);
@@ -3692,10 +3626,7 @@ static void link_pwq(struct pool_workqueue *pwq)
if (!list_empty(&pwq->pwqs_node))
return;
- /*
- * Set the matching work_color. This is synchronized with
- * wq->mutex to avoid confusing flush_workqueue().
- */
+ /* set the matching work_color */
pwq->work_color = wq->work_color;
/* sync max_active to the current setting */
@@ -3832,7 +3763,7 @@ int apply_workqueue_attrs(struct workqueue_struct *wq,
if (WARN_ON((wq->flags & __WQ_ORDERED) && !list_empty(&wq->pwqs)))
return -EINVAL;
- pwq_tbl = kzalloc(wq_numa_tbl_len * sizeof(pwq_tbl[0]), GFP_KERNEL);
+ pwq_tbl = kzalloc(nr_node_ids * sizeof(pwq_tbl[0]), GFP_KERNEL);
new_attrs = alloc_workqueue_attrs(GFP_KERNEL);
tmp_attrs = alloc_workqueue_attrs(GFP_KERNEL);
if (!pwq_tbl || !new_attrs || !tmp_attrs)
@@ -4080,7 +4011,7 @@ struct workqueue_struct *__alloc_workqueue_key(const char *fmt,
/* allocate wq and format name */
if (flags & WQ_UNBOUND)
- tbl_size = wq_numa_tbl_len * sizeof(wq->numa_pwq_tbl[0]);
+ tbl_size = nr_node_ids * sizeof(wq->numa_pwq_tbl[0]);
wq = kzalloc(sizeof(*wq) + tbl_size, GFP_KERNEL);
if (!wq)
@@ -4122,7 +4053,7 @@ struct workqueue_struct *__alloc_workqueue_key(const char *fmt,
if (flags & WQ_MEM_RECLAIM) {
struct worker *rescuer;
- rescuer = alloc_worker();
+ rescuer = alloc_worker(NUMA_NO_NODE);
if (!rescuer)
goto err_destroy;
@@ -4470,8 +4401,6 @@ static void wq_unbind_fn(struct work_struct *work)
struct worker *worker;
for_each_cpu_worker_pool(pool, cpu) {
- WARN_ON_ONCE(cpu != smp_processor_id());
-
mutex_lock(&pool->attach_mutex);
spin_lock_irq(&pool->lock);
@@ -4543,6 +4472,7 @@ static void rebind_workers(struct worker_pool *pool)
pool->attrs->cpumask) < 0);
spin_lock_irq(&pool->lock);
+ pool->flags &= ~POOL_DISASSOCIATED;
for_each_pool_worker(worker, pool) {
unsigned int worker_flags = worker->flags;
@@ -4632,7 +4562,7 @@ static int workqueue_cpu_up_callback(struct notifier_block *nfb,
for_each_cpu_worker_pool(pool, cpu) {
if (pool->nr_workers)
continue;
- if (create_and_start_worker(pool) < 0)
+ if (!create_worker(pool))
return NOTIFY_BAD;
}
break;
@@ -4645,10 +4575,6 @@ static int workqueue_cpu_up_callback(struct notifier_block *nfb,
mutex_lock(&pool->attach_mutex);
if (pool->cpu == cpu) {
- spin_lock_irq(&pool->lock);
- pool->flags &= ~POOL_DISASSOCIATED;
- spin_unlock_irq(&pool->lock);
-
rebind_workers(pool);
} else if (pool->cpu < 0) {
restore_unbound_workers_cpumask(pool, cpu);
@@ -4856,10 +4782,6 @@ static void __init wq_numa_init(void)
cpumask_var_t *tbl;
int node, cpu;
- /* determine NUMA pwq table len - highest node id + 1 */
- for_each_node(node)
- wq_numa_tbl_len = max(wq_numa_tbl_len, node + 1);
-
if (num_possible_nodes() <= 1)
return;
@@ -4876,7 +4798,7 @@ static void __init wq_numa_init(void)
* available. Build one from cpu_to_node() which should have been
* fully initialized by now.
*/
- tbl = kzalloc(wq_numa_tbl_len * sizeof(tbl[0]), GFP_KERNEL);
+ tbl = kzalloc(nr_node_ids * sizeof(tbl[0]), GFP_KERNEL);
BUG_ON(!tbl);
for_each_node(node)
@@ -4936,7 +4858,7 @@ static int __init init_workqueues(void)
for_each_cpu_worker_pool(pool, cpu) {
pool->flags &= ~POOL_DISASSOCIATED;
- BUG_ON(create_and_start_worker(pool) < 0);
+ BUG_ON(!create_worker(pool));
}
}