[Devel] [PATCH 5/9] deal with movement of tasks across groups

[Srivatsa Vaddagiri]

When a task moves between groups (as initiated by an administrator), it has to
be removed from the runqueue of its old group and added to the runqueue of its
new group. This patch defines this move operation.

Signed-off-by : Srivatsa Vaddagiri <vatsa at in.ibm.com>


 1 file changed, 28 insertions(+)


---


diff -puN kernel/sched.c~task_move kernel/sched.c
--- linux-2.6.20/kernel/sched.c~task_move	2007-04-11 12:00:51.000000000 +0530
+++ linux-2.6.20-vatsa/kernel/sched.c	2007-04-12 11:07:16.000000000 +0530
@@ -7449,4 +7449,32 @@ static int sched_get_quota(struct task_g
 	return cpu_quota(tg);
 }
 
+/*
+ * Move a task from one group to another. If the task is already on a
+ * runqueue, this involves removing the task from its old group's runqueue
+ * and adding to its new group's runqueue.
+ */
+static void sched_move_task(struct task_grp *tg_new, struct task_grp *tg_old,
+					struct task_struct *tsk)
+{
+	struct rq *rq;
+	unsigned long flags;
+
+	if (tg_new == tg_old)
+		return;
+
+	rq = task_rq_lock(tsk, &flags);
+
+	if (tsk->array) {
+		/* Set tsk->group to tg_old here */
+		deactivate_task(tsk, rq);
+		/* Set tsk->group to tg_new here */
+		__activate_task(tsk, rq);
+	}
+
+	task_rq_unlock(rq, &flags);
+
+	return;
+}
+
 #endif /* CONFIG_CPUMETER */
_
-- 
Regards,
vatsa
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