linux-kernel - Re: [RFC/PATCH 0/3] sched: hrtick and rt group scheduling

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Date:	Mon, 31 Dec 2007 10:27:38 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	dmitry.adamushko@...il.com,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Gregory Haskins <ghaskins@...ell.com>
Subject: Re: [RFC/PATCH 0/3] sched: hrtick and rt group scheduling


* Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:

> I spend xmas implementing group scheduling for the realtime scheduling 
> classes. Its a tad raw, but seems to work for the trivial test cases I 
> threw at it.
> 
> The hrtick stuff is unrelated but was still stuck in my sched queue.

thanks Peter, this is really cool stuff! I have picked up all 3 patches 
into sched-devel.git - let's see how they work out.

(btw., i had to do the fixes below. Are you sure you sent the right 
version of the patches?)

	Ingo

Index: linux/kernel/sched_rt.c
===================================================================
--- linux.orig/kernel/sched_rt.c
+++ linux/kernel/sched_rt.c
@@ -337,7 +337,6 @@ static void dequeue_rt_entity(struct sch
 {
 	struct rt_rq *rt_rq = rt_rq_of_se(rt_se);
 	struct rt_prio_array *array = &rt_rq->active;
-	struct rt_rq *group_rq = group_rt_rq(rt_se);
 
 	list_del_init(&rt_se->run_list);
 	if (list_empty(array->queue + rt_se_prio(rt_se)))
@@ -527,10 +526,8 @@ static struct task_struct *pick_next_tas
 
 	do {
 		rt_se = pick_next_rt_entity(rq, rt_rq);
-		if (unlikely(!rt_se)) {
-			foo = 1;
+		if (unlikely(!rt_se))
 			goto retry;
-		}
 		rt_rq = group_rt_rq(rt_se);
 	} while (rt_rq);
 
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