linux-kernel - [PATCH 3/8] workqueue: remove cpu_intensive from process_one

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Date:	Mon, 15 Apr 2013 00:41:51 +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 3/8] workqueue: remove cpu_intensive from process_one_work()

In process_one_work(), we can use "worker->flags & WORKER_CPU_INTENSIVE"
instead "cpu_intensive" and because worker->flags is hot field
(accessed when process each work item). so this change will not cause
any performance down.

It prepare for also clearing WORKER_QUIT_CM in the same place.

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---
 kernel/workqueue.c |    7 +++----
 1 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index d1e10c5..a4bc589 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -2068,7 +2068,6 @@ __acquires(&pool->lock)
 {
 	struct pool_workqueue *pwq = get_work_pwq(work);
 	struct worker_pool *pool = worker->pool;
-	bool cpu_intensive = pwq->wq->flags & WQ_CPU_INTENSIVE;
 	int work_color;
 	struct worker *collision;
 #ifdef CONFIG_LOCKDEP
@@ -2118,7 +2117,7 @@ __acquires(&pool->lock)
 	 * CPU intensive works don't participate in concurrency
 	 * management.  They're the scheduler's responsibility.
 	 */
-	if (unlikely(cpu_intensive))
+	if (unlikely(pwq->wq->flags & WQ_CPU_INTENSIVE))
 		worker_set_flags(worker, WORKER_CPU_INTENSIVE, true);
 
 	/*
@@ -2161,8 +2160,8 @@ __acquires(&pool->lock)
 
 	spin_lock_irq(&pool->lock);
 
-	/* clear cpu intensive status */
-	if (unlikely(cpu_intensive))
+	/* clear cpu intensive status if it is set */
+	if (unlikely(worker->flags & WORKER_CPU_INTENSIVE))
 		worker_clr_flags(worker, WORKER_CPU_INTENSIVE);
 
 	/* we're done with it, release */
-- 
1.7.7.6

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