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From: Thomas Gleixner <>
To: LKML <>
Cc: Peter Zijlstra <>
Subject: sched: Warn on rt throttling
Date: Wed, 5 Oct 2011 13:32:34 +0200 (CEST)
Message-ID: <alpine.LFD.2.02.1110051331480.18778@ionos> (raw)

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 <>

 kernel/sched_rt.c |    1 +
 1 file changed, 1 insertion(+)

Index: linux-2.6/kernel/sched_rt.c
--- linux-2.6.orig/kernel/sched_rt.c
+++ linux-2.6/kernel/sched_rt.c
@@ -631,6 +631,7 @@ static int sched_rt_runtime_exceeded(str
 	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)) {
 			return 1;

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