From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 5 Oct 2011 11:32:34 +0000 (+0200)
Subject: sched: Warn on rt throttling
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1c83437e80186832a9a48dbb6b8868d28e40e562;p=linux-beck.git

sched: Warn on rt throttling

The default rt-throttling is a source of never ending questions. Warn
once when we go into throttling so folks have that info in dmesg.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/alpine.LFD.2.02.1110051331480.18778@ionos
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 3023fd1ef364..056cbd2e2a27 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -655,6 +655,7 @@ static int sched_rt_runtime_exceeded(struct rt_rq *rt_rq)
 
 	if (rt_rq->rt_time > runtime) {
 		rt_rq->rt_throttled = 1;
+		printk_once(KERN_WARNING "sched: RT throttling activated\n");
 		if (rt_rq_throttled(rt_rq)) {
 			sched_rt_rq_dequeue(rt_rq);
 			return 1;