From: Lai Jiangshan <laijs@cn.fujitsu.com>
To: Tejun Heo <tj@kernel.org>, linux-kernel@vger.kernel.org
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Subject: [PATCH 09/10] workqueue: single pass rebind_workers
Date: Sun, 2 Sep 2012 00:28:27 +0800 [thread overview]
Message-ID: <1346516916-1991-10-git-send-email-laijs@cn.fujitsu.com> (raw)
In-Reply-To: <1346516916-1991-1-git-send-email-laijs@cn.fujitsu.com>
busy_worker_rebind_fn() can't return until all idle workers are rebound,
the code of busy_worker_rebind_fn() ensure this.
So we can change the order of the code of rebind_workers(),
and make it is a single pass to do the rebind_workers().
It makes the code much clean and better readability(still need later patch
to improve the readability)
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
---
kernel/workqueue.c | 23 ++++++++---------------
1 files changed, 8 insertions(+), 15 deletions(-)
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 16bcd84..6d68571 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1458,16 +1458,11 @@ static void rebind_workers(struct global_cwq *gcwq)
init_completion(&idle_rebind.ref_done);
idle_rebind.ref_cnt = 1;
gcwq->idle_rebind = &idle_rebind;
-retry:
idle_rebind.idle_cnt = 1;
- INIT_COMPLETION(idle_rebind.idle_done);
/* set REBIND and kick idle ones, we'll wait for these later */
for_each_worker_pool(pool, gcwq) {
list_for_each_entry(worker, &pool->idle_list, entry) {
- if (!(worker->flags & WORKER_UNBOUND))
- continue;
-
/* morph UNBOUND to REBIND */
worker->flags &= ~WORKER_UNBOUND;
worker->flags |= WORKER_REBIND;
@@ -1479,16 +1474,6 @@ retry:
}
}
- if (--idle_rebind.idle_cnt) {
- spin_unlock_irq(&gcwq->lock);
- wait_for_completion(&idle_rebind.idle_done);
- spin_lock_irq(&gcwq->lock);
- /* busy ones might have become idle while waiting, retry */
- goto retry;
- }
-
- complete_all(&idle_rebind.rebind_hold);
-
/* rebind busy workers */
for_each_busy_worker(worker, i, pos, gcwq) {
struct work_struct *rebind_work = &worker->rebind_work;
@@ -1515,6 +1500,14 @@ retry:
* we will leave rebind_workers(), have to wait until no worker
* has ref to this idle_rebind.
*/
+ if (--idle_rebind.idle_cnt) {
+ spin_unlock_irq(&gcwq->lock);
+ wait_for_completion(&idle_rebind.idle_done);
+ spin_lock_irq(&gcwq->lock);
+ }
+
+ complete_all(&idle_rebind.rebind_hold);
+
if (--idle_rebind.ref_cnt) {
spin_unlock_irq(&gcwq->lock);
wait_for_completion(&idle_rebind.ref_done);
--
1.7.4.4
next prev parent reply other threads:[~2012-09-01 17:45 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-01 16:28 [PATCH 00/10 V4] workqueue: fix and cleanup hotplug/rebind_workers() Lai Jiangshan
2012-09-01 16:28 ` [PATCH 01/10 V4] workqueue: ensure the wq_worker_sleeping() see the right flags Lai Jiangshan
2012-09-04 23:39 ` [PATCH] workqueue: UNBOUND -> REBIND morphing in rebind_workers() should be atomic Tejun Heo
2012-09-04 23:58 ` [PATCH -stable] " Tejun Heo
2012-09-16 15:49 ` Ben Hutchings
2012-09-05 1:05 ` [PATCH] " Lai Jiangshan
2012-09-05 1:17 ` Tejun Heo
2012-09-01 16:28 ` [PATCH 02/10 V4] workqueue: fix deadlock in rebind_workers() Lai Jiangshan
2012-09-05 0:54 ` Tejun Heo
2012-09-05 1:28 ` Lai Jiangshan
2012-09-05 1:33 ` Tejun Heo
2012-09-01 16:28 ` [PATCH 03/10 V4] workqueue: add POOL_MANAGING_WORKERS Lai Jiangshan
2012-09-01 16:28 ` [PATCH 04/10 V4] workqueue: add manage_workers_slowpath() Lai Jiangshan
2012-09-05 1:12 ` Tejun Heo
2012-09-06 1:55 ` Lai Jiangshan
2012-09-01 16:28 ` [PATCH 05/10 V4] workqueue: move rebind_hold to idle_rebind Lai Jiangshan
2012-09-01 16:28 ` [PATCH 06/10 V4] workqueue: simple clear WORKER_REBIND Lai Jiangshan
2012-09-01 16:28 ` [PATCH 07/10 V4] workqueue: move idle_rebind pointer to gcwq Lai Jiangshan
2012-09-01 16:28 ` [PATCH 08/10 V4] workqueue: explicit way to wait for idles workers to finish Lai Jiangshan
2012-09-01 16:28 ` Lai Jiangshan [this message]
2012-09-01 16:28 ` [PATCH 10/10 V4] workqueue: merge the role of rebind_hold to idle_done Lai Jiangshan
2012-09-05 1:15 ` Tejun Heo
2012-09-05 1:48 ` Lai Jiangshan
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