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Date: Tue, 28 Aug 2012 01:58:27 +0800
From: Lai Jiangshan <laijs@...fujitsu.com>
To: Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org
Cc: Lai Jiangshan <laijs@...fujitsu.com>
Subject: [PATCH 7/7] workqueue: static idle_rebind
rebind_workers() is protected by cpu_hotplug lock,
so struct idle_rebind is also proteced by it.
And we can use a compile time allocated idle_rebind instead
of allocating it from the stack. it makes code clean.
Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---
kernel/workqueue.c | 28 +++++++++++-----------------
1 files changed, 11 insertions(+), 17 deletions(-)
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 9f38a65..a9bdf9c 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -125,7 +125,6 @@ enum {
struct global_cwq;
struct worker_pool;
-struct idle_rebind;
/*
* The poor guys doing the actual heavy lifting. All on-duty workers
@@ -149,7 +148,6 @@ struct worker {
int id; /* I: worker id */
/* for rebinding worker to CPU */
- struct idle_rebind *idle_rebind; /* L: for idle worker */
struct work_struct rebind_work; /* L: for busy worker */
};
@@ -1302,10 +1300,8 @@ __acquires(&gcwq->lock)
}
}
-struct idle_rebind {
- int cnt; /* # workers to be rebound */
- struct completion done; /* all workers rebound */
-};
+static int idle_rebind_cnt; /* # workers to be rebound */
+static struct completion idle_rebind_done; /* all workers rebound */
/*
* Rebind an idle @worker to its CPU. During CPU onlining, this has to
@@ -1317,8 +1313,8 @@ static void idle_worker_rebind(struct worker *worker)
/* CPU must be online at this point */
WARN_ON(!worker_maybe_bind_and_lock(worker));
worker_clr_flags(worker, WORKER_REBIND);
- if (!--worker->idle_rebind->cnt)
- complete(&worker->idle_rebind->done);
+ if (!--idle_rebind_cnt)
+ complete(&idle_rebind_done);
spin_unlock_irq(&worker->pool->gcwq->lock);
/* we did our part, wait for rebind_workers() to finish up */
@@ -1377,7 +1373,6 @@ static void busy_worker_rebind_fn(struct work_struct *work)
static void rebind_workers(struct global_cwq *gcwq)
__releases(&gcwq->lock) __acquires(&gcwq->lock)
{
- struct idle_rebind idle_rebind;
struct worker_pool *pool;
struct worker *worker;
struct hlist_node *pos;
@@ -1390,12 +1385,12 @@ static void rebind_workers(struct global_cwq *gcwq)
/*
* Rebind idle workers. Interlocked both ways. We wait for
- * workers to rebind via @idle_rebind.done. Workers will wait for
+ * workers to rebind via @idle_rebind_done. Workers will wait for
* us to finish up by competing on pool->manager_mutex.
*/
- init_completion(&idle_rebind.done);
- idle_rebind.cnt = 0;
- INIT_COMPLETION(idle_rebind.done);
+ init_completion(&idle_rebind_done);
+ idle_rebind_cnt = 0;
+ INIT_COMPLETION(idle_rebind_done);
/* set REBIND and kick idle ones, we'll wait for these later */
for_each_worker_pool(pool, gcwq) {
@@ -1404,8 +1399,7 @@ static void rebind_workers(struct global_cwq *gcwq)
worker->flags &= ~WORKER_UNBOUND;
worker->flags |= WORKER_REBIND;
- idle_rebind.cnt++;
- worker->idle_rebind = &idle_rebind;
+ idle_rebind_cnt++;
/* worker_thread() will call idle_worker_rebind() */
wake_up_process(worker->task);
@@ -1435,9 +1429,9 @@ static void rebind_workers(struct global_cwq *gcwq)
}
/* waiting for all idle workers to be rebound */
- if (idle_rebind.cnt) {
+ if (idle_rebind_cnt) {
spin_unlock_irq(&gcwq->lock);
- wait_for_completion(&idle_rebind.done);
+ wait_for_completion(&idle_rebind_done);
spin_lock_irq(&gcwq->lock);
}
}
--
1.7.4.4
--
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