linux-kernel - [PATCH v2 2/3] sched/rt: __disable_runtime: Enqueue just unthrottled rt

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Message-ID: <1403596438.3462.27.camel@tkhai>
Date:	Tue, 24 Jun 2014 11:53:58 +0400
From:	Kirill Tkhai <ktkhai@...allels.com>
To:	<linux-kernel@...r.kernel.org>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, <tkhai@...dex.ru>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	"Mike Galbraith" <umgwanakikbuti@...il.com>,
	<khorenko@...allels.com>, Ben Segall <bsegall@...gle.com>,
	Paul Turner <pjt@...gle.com>
Subject: [PATCH v2 2/3] sched/rt: __disable_runtime: Enqueue just
 unthrottled rt_rq back on the stack


Make rt_rq available for pick_next_task(). Otherwise, their tasks
stay prisoned long time till dead cpu becomes alive again.

Signed-off-by: Kirill Tkhai <ktkhai@...allels.com>
CC: Konstantin Khorenko <khorenko@...allels.com>
CC: Ben Segall <bsegall@...gle.com>
CC: Paul Turner <pjt@...gle.com>
CC: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
CC: Mike Galbraith <umgwanakikbuti@...il.com>
CC: Peter Zijlstra <peterz@...radead.org>
CC: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/rt.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index a490831..671a8b5 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -740,6 +740,9 @@ static void __disable_runtime(struct rq *rq)
 		rt_rq->rt_throttled = 0;
 		raw_spin_unlock(&rt_rq->rt_runtime_lock);
 		raw_spin_unlock(&rt_b->rt_runtime_lock);
+
+		/* Make rt_rq available for pick_next_task() */
+		sched_rt_rq_enqueue(rt_rq);
 	}
 }
 



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