linux-kernel - [PATCH -tip] rcu: use kthread_create_on

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Date:	Thu, 19 May 2011 10:32:45 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...ux.intel.com>, Ingo Molnar <mingo@...e.hu>
Subject: [PATCH -tip] rcu: use kthread_create_on_node()

Commit a26ac2455ffc (move TREE_RCU from softirq to kthread) added
creation of per cpu kthreads.

Use kthread_create_on_node() NUMA friendly function, to let these
threads use local node for their stack/task struct.

We did a similar change in commit 94dcf29a11b3 (kthread: use
kthread_create_on_node())

Also change rcu torture kthread creation.

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
CC: Tejun Heo <tj@...nel.org>
CC: Rusty Russell <rusty@...tcorp.com.au>
CC: Andrew Morton <akpm@...ux-foundation.org>
CC: Andi Kleen <ak@...ux.intel.com>
CC: Ingo Molnar <mingo@...e.hu>
---
 kernel/rcutorture.c |    3 ++-
 kernel/rcutree.c    |    5 ++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index 2e138db..40d9ed2 100644
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -1282,7 +1282,8 @@ static int rcutorture_booster_init(int cpu)
 	/* Don't allow time recalculation while creating a new task. */
 	mutex_lock(&boost_mutex);
 	VERBOSE_PRINTK_STRING("Creating rcu_torture_boost task");
-	boost_tasks[cpu] = kthread_create(rcu_torture_boost, NULL,
+	boost_tasks[cpu] = kthread_create_on_node(rcu_torture_boost, NULL,
+						  cpu_to_node(cpu),
 					  "rcu_torture_boost");
 	if (IS_ERR(boost_tasks[cpu])) {
 		retval = PTR_ERR(boost_tasks[cpu]);
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 5616b17..b013915 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -1649,7 +1649,10 @@ static int __cpuinit rcu_spawn_one_cpu_kthread(int cpu)
 	if (!rcu_kthreads_spawnable ||
 	    per_cpu(rcu_cpu_kthread_task, cpu) != NULL)
 		return 0;
-	t = kthread_create(rcu_cpu_kthread, (void *)(long)cpu, "rcuc%d", cpu);
+	t = kthread_create_on_node(rcu_cpu_kthread,
+				   (void *)(long)cpu,
+				   cpu_to_node(cpu),
+				   "rcuc%d", cpu);
 	if (IS_ERR(t))
 		return PTR_ERR(t);
 	kthread_bind(t, cpu);


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