[Devel] [PATCH 4/9] define group operations

[Srivatsa Vaddagiri]

Define these operations for a task-group:

        - create new group
        - destroy existing group
        - set bandwidth (quota) for a group
        - get bandwidth (quota) of a group

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


 1 file changed, 71 insertions(+)


---


diff -puN kernel/sched.c~grp_ops kernel/sched.c
--- linux-2.6.20/kernel/sched.c~grp_ops	2007-04-11 12:00:50.000000000 +0530
+++ linux-2.6.20-vatsa/kernel/sched.c	2007-04-12 11:07:17.000000000 +0530
@@ -7379,3 +7379,74 @@ void set_curr_task(int cpu, struct task_
 }
 
 #endif
+
+#ifdef CONFIG_CPUMETER
+
+/* Allocate runqueue structures for the new task-group */
+static int sched_create_group(void)
+{
+	struct task_grp *tg;
+	struct task_grp_rq *tgrq;
+	int i;
+
+	tg = kzalloc(sizeof(*tg), GFP_KERNEL);
+	if (!tg)
+		return -ENOMEM;
+
+	tg->ticks = CPU_CONTROL_SHORT_WINDOW;
+	tg->long_ticks = NUM_LONG_TICKS;
+
+	for_each_possible_cpu(i) {
+		tgrq = kzalloc(sizeof(*tgrq), GFP_KERNEL);
+		if (!tgrq)
+			goto oom;
+		tg->rq[i] = tgrq;
+		task_grp_rq_init(tgrq, tg);
+	}
+
+	/* A later patch will make 'tg' accessible beyond this function */
+	return 0;
+oom:
+	while (i--)
+		kfree(tg->rq[i]);
+
+	kfree(tg);
+	return -ENOMEM;
+}
+
+/* Deallocate runqueue structures */
+static void sched_destroy_group(struct task_grp *tg)
+{
+	int i;
+
+	for_each_possible_cpu(i)
+		kfree(tg->rq[i]);
+
+	kfree(tg);
+}
+
+/* Assign quota to this group */
+static int sched_set_quota(struct task_grp *tg, int quota)
+{
+	int i;
+
+	tg->ticks = (quota * CPU_CONTROL_SHORT_WINDOW) / 100;
+
+	for_each_possible_cpu(i)
+		tg->rq[i]->ticks = tg->ticks;
+
+	return 0;
+}
+
+static inline int cpu_quota(struct task_grp *tg)
+{
+	return (tg->ticks * 100) / CPU_CONTROL_SHORT_WINDOW;
+}
+
+/* Return assigned quota for this group */
+static int sched_get_quota(struct task_grp *tg)
+{
+	return cpu_quota(tg);
+}
+
+#endif /* CONFIG_CPUMETER */
_
-- 
Regards,
vatsa
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