linux-kernel - [PATCH 3.12 24/83] sched: Fix RLIMIT

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Message-Id: <f9212814b6925eaba8f089bcc110ba5aec1ef13d.1430159990.git.jslaby@suse.cz>
Date:	Mon, 27 Apr 2015 23:31:55 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Brian Silverman <brian@...oton-tech.com>,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	austin@...oton-tech.com, Ingo Molnar <mingo@...nel.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 24/83] sched: Fix RLIMIT_RTTIME when PI-boosting to RT

From: Brian Silverman <brian@...oton-tech.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 746db9443ea57fd9c059f62c4bfbf41cf224fe13 upstream.

When non-realtime tasks get priority-inheritance boosted to a realtime
scheduling class, RLIMIT_RTTIME starts to apply to them. However, the
counter used for checking this (the same one used for SCHED_RR
timeslices) was not getting reset. This meant that tasks running with a
non-realtime scheduling class which are repeatedly boosted to a realtime
one, but never block while they are running realtime, eventually hit the
timeout without ever running for a time over the limit. This patch
resets the realtime timeslice counter when un-PI-boosting from an RT to
a non-RT scheduling class.

I have some test code with two threads and a shared PTHREAD_PRIO_INHERIT
mutex which induces priority boosting and spins while boosted that gets
killed by a SIGXCPU on non-fixed kernels but doesn't with this patch
applied. It happens much faster with a CONFIG_PREEMPT_RT kernel, and
does happen eventually with PREEMPT_VOLUNTARY kernels.

Signed-off-by: Brian Silverman <brian@...oton-tech.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: austin@...oton-tech.com
Link: http://lkml.kernel.org/r/1424305436-6716-1-git-send-email-brian@peloton-tech.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 kernel/sched/core.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index f09e22163be3..0030db473c99 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3060,8 +3060,11 @@ void rt_mutex_setprio(struct task_struct *p, int prio)

 	if (rt_prio(prio))
 		p->sched_class = &rt_sched_class;
-	else
+	else {
+		if (rt_prio(oldprio))
+			p->rt.timeout = 0;
 		p->sched_class = &fair_sched_class;
+	}

 	p->prio = prio;

-- 
2.3.5

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