Message-ID: <1369212383.5916.28.camel@marge.simpson.net>
Subject: Re: [PATCH RFC] sched/rt: preserve global runtime/period ratio in
 do_balance_runtime()
From: Mike Galbraith <bitbucket@online.de>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Peter Boonstoppel <pboonstoppel@nvidia.com>,
        Ingo Molnar <mingo@redhat.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Paul Walmsley <pwalmsley@nvidia.com>
Date: Wed, 22 May 2013 10:46:23 +0200
In-Reply-To: <20130522081601.GP26912@twins.programming.kicks-ass.net>
References: <5FBF8E85CA34454794F0F7ECBA79798F37ADA53CA7@HQMAIL04.nvidia.com>
	 <20130522081601.GP26912@twins.programming.kicks-ass.net>
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On Wed, 2013-05-22 at 10:16 +0200, Peter Zijlstra wrote:

> I thought we already had a knob for that; RT_RUNTIME_SHARE. And as Mike
> said, we might consider flipping the default on that.


sched,rt: disable rt_runtime borrowing by default

Make the default RT_RUNTIME_SHARE setting reflect the most common
throttle role, that of safety mechanism to protect the box.

Signed-off-by: Mike Galbraith <bitbucket@online.de>

diff --git a/kernel/sched/features.h b/kernel/sched/features.h
index 99399f8..0945d38 100644
--- a/kernel/sched/features.h
+++ b/kernel/sched/features.h
@@ -57,7 +57,7 @@ SCHED_FEAT(NONTASK_POWER, true)
 SCHED_FEAT(TTWU_QUEUE, true)
 
 SCHED_FEAT(FORCE_SD_OVERLAP, false)
-SCHED_FEAT(RT_RUNTIME_SHARE, true)
+SCHED_FEAT(RT_RUNTIME_SHARE, false)
 SCHED_FEAT(LB_MIN, false)
 
 /*


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