---

yaml --- r: 339066 b: refs/heads/master c: 0a74bef h: refs/heads/master v: v3
git-mirror · Oct 24, 2012 · f49d0dc · f49d0dc
1 parent 1270dfe
commit f49d0dc
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Showing 4 changed files with 16 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 9ee474f55664ff63111c843099d365e7ecffb56f
+refs/heads/master: 0a74bef8bed18dc6889e9bc37ea1050a50c86c89
diff --git a/trunk/include/linux/sched.h b/trunk/include/linux/sched.h
@@ -1061,6 +1061,7 @@ struct sched_class {
 
 #ifdef CONFIG_SMP
 	int  (*select_task_rq)(struct task_struct *p, int sd_flag, int flags);
+	void (*migrate_task_rq)(struct task_struct *p, int next_cpu);
 
 	void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
 	void (*post_schedule) (struct rq *this_rq);

diff --git a/trunk/kernel/sched/core.c b/trunk/kernel/sched/core.c
@@ -952,6 +952,8 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
 	trace_sched_migrate_task(p, new_cpu);
 
 	if (task_cpu(p) != new_cpu) {
+		if (p->sched_class->migrate_task_rq)
+			p->sched_class->migrate_task_rq(p, new_cpu);
 		p->se.nr_migrations++;
 		perf_sw_event(PERF_COUNT_SW_CPU_MIGRATIONS, 1, NULL, 0);
 	}

diff --git a/trunk/kernel/sched/fair.c b/trunk/kernel/sched/fair.c
@@ -3047,6 +3047,17 @@ select_task_rq_fair(struct task_struct *p, int sd_flag, int wake_flags)
 
 	return new_cpu;
 }
+
+/*
+ * Called immediately before a task is migrated to a new cpu; task_cpu(p) and
+ * cfs_rq_of(p) references at time of call are still valid and identify the
+ * previous cpu.  However, the caller only guarantees p->pi_lock is held; no
+ * other assumptions, including the state of rq->lock, should be made.
+ */
+static void
+migrate_task_rq_fair(struct task_struct *p, int next_cpu)
+{
+}
 #endif /* CONFIG_SMP */
 
 static unsigned long
@@ -5607,6 +5618,7 @@ const struct sched_class fair_sched_class = {
 
 #ifdef CONFIG_SMP
 	.select_task_rq		= select_task_rq_fair,
+	.migrate_task_rq	= migrate_task_rq_fair,
 
 	.rq_online		= rq_online_fair,
 	.rq_offline		= rq_offline_fair,