we use list_del_init(&worker->entry) when rebind(exile) idles
or destroy idles.
So we can use list_empty(&worker->entry) to know: does the worker
has been exiled or killed.
WORKER_REBIND is not need any more, remove it to reduce the states
of workers.
Signed-off-by: Lai Jiangshan <la...@cn.fujitsu.com>
---
kernel/workqueue.c | 26 ++++++++------------------
1 files changed, 8 insertions(+), 18 deletions(-)
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 4b1ff46..bc846b1 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -73,11 +73,10 @@ enum {
WORKER_DIE = 1 << 1, /* die die die */
WORKER_IDLE = 1 << 2, /* is idle */
WORKER_PREP = 1 << 3, /* preparing to run works */
- WORKER_REBIND = 1 << 5, /* mom is home, come back */
WORKER_CPU_INTENSIVE = 1 << 6, /* cpu intensive */
WORKER_UNBOUND = 1 << 7, /* worker is unbound */
- WORKER_NOT_RUNNING = WORKER_PREP | WORKER_REBIND | WORKER_UNBOUND |
+ WORKER_NOT_RUNNING = WORKER_PREP | WORKER_UNBOUND |
WORKER_CPU_INTENSIVE,
NR_WORKER_POOLS = 2, /* # worker pools per gcwq */
@@ -1615,7 +1614,7 @@ __acquires(&gcwq->lock)
/*
* Rebind an idle @worker to its CPU. worker_thread() will test
- * %WORKER_REBIND before leaving idle and call this function.
+ * worker->entry before leaving idle and call this function.
*/
static void idle_worker_rebind(struct worker *worker)
{
@@ -1624,7 +1623,6 @@ static void idle_worker_rebind(struct worker *worker)
if (worker_maybe_bind_and_lock(worker))
worker_clr_flags(worker, WORKER_UNBOUND);
- worker_clr_flags(worker, WORKER_REBIND);
list_add(&worker->entry, &worker->pool->idle_list);
spin_unlock_irq(&gcwq->lock);
}
@@ -1676,16 +1674,9 @@ static void rebind_workers(struct global_cwq *gcwq)
for_each_worker_pool(pool, gcwq)
lockdep_assert_held(&pool->manager_mutex);
- /* set REBIND and kick idle ones */
+ /* exile and kick idle ones */
for_each_worker_pool(pool, gcwq) {
list_for_each_entry_safe(worker, n, &pool->idle_list, entry) {
- unsigned long worker_flags = worker->flags;
-
- /* morph UNBOUND to REBIND atomically */
- worker_flags &= ~WORKER_UNBOUND;
- worker_flags |= WORKER_REBIND;
- ACCESS_ONCE(worker->flags) = worker_flags;
-
/* exile idle workers */
list_del_init(&worker->entry);
@@ -2159,7 +2150,7 @@ __acquires(&gcwq->lock)
* necessary to avoid spurious warnings from rescuers servicing the
* unbound or a disassociated gcwq.
*/
- WARN_ON_ONCE(!(worker->flags & (WORKER_UNBOUND | WORKER_REBIND)) &&
+ WARN_ON_ONCE(!(worker->flags & WORKER_UNBOUND) &&
!(gcwq->flags & GCWQ_DISASSOCIATED) &&
raw_smp_processor_id() != gcwq->cpu);
@@ -2283,18 +2274,17 @@ static int worker_thread(void *__worker)
woke_up:
spin_lock_irq(&gcwq->lock);
- /*
- * DIE can be set only while idle and REBIND set while busy has
- * @worker->rebind_work scheduled. Checking here is enough.
- */
- if (unlikely(worker->flags & (WORKER_REBIND | WORKER_DIE))) {
+ /* Is it still in idle_list ? */
+ if (unlikely(list_empty(&worker->entry))) {
spin_unlock_irq(&gcwq->lock);
+ /* reason: killed */
if (worker->flags & WORKER_DIE) {
worker->task->flags &= ~PF_WQ_WORKER;
return 0;
}
+ /* reason: idle rebind */
idle_worker_rebind(worker);
goto woke_up;
}
--
1.7.4.4
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