From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org,
linux-rt-users <linux-rt-users@vger.kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Carsten Emde <C.Emde@osadl.org>, John Kacur <jkacur@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Clark Williams <clark.williams@gmail.com>,
Ingo Molnar <mingo@kernel.org>
Subject: [RFC][PATCH RT 4/4] sched/rt: Initiate a pull when the priority of a task is lowered
Date: Fri, 07 Dec 2012 18:56:19 -0500 [thread overview]
Message-ID: <20121208000900.747763148@goodmis.org> (raw)
In-Reply-To: 20121207235615.206108556@goodmis.org
[-- Attachment #1: rt-migrate-redo.patch --]
[-- Type: text/plain, Size: 835 bytes --]
If a task lowers its priority (say by losing priority inheritance)
if a higher priority task is waiting on another CPU, initiate a pull.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Index: linux-rt.git/kernel/sched/rt.c
===================================================================
--- linux-rt.git.orig/kernel/sched/rt.c
+++ linux-rt.git/kernel/sched/rt.c
@@ -997,6 +997,8 @@ inc_rt_prio(struct rt_rq *rt_rq, int pri
inc_rt_prio_smp(rt_rq, prio, prev_prio);
}
+static int pull_rt_task(struct rq *this_rq);
+
static void
dec_rt_prio(struct rt_rq *rt_rq, int prio)
{
@@ -1021,6 +1023,9 @@ dec_rt_prio(struct rt_rq *rt_rq, int pri
rt_rq->highest_prio.curr = MAX_RT_PRIO;
dec_rt_prio_smp(rt_rq, prio, prev_prio);
+
+ if (prev_prio < rt_rq->highest_prio.curr)
+ pull_rt_task(rq_of_rt_rq(rt_rq));
}
#else
next prev parent reply other threads:[~2012-12-07 23:56 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-07 23:56 [RFC][PATCH RT 0/4] sched/rt: Lower rq lock contention latencies on many CPU boxes Steven Rostedt
2012-12-07 23:56 ` [RFC][PATCH RT 1/4] sched/rt: Fix push_rt_task() to have the same checks as the caller did Steven Rostedt
2012-12-07 23:56 ` [RFC][PATCH RT 2/4] sched/rt: Try to migrate task if preempting pinned rt task Steven Rostedt
2012-12-07 23:56 ` [RFC][PATCH RT 3/4] sched/rt: Use IPI to trigger RT task push migration instead of pulling Steven Rostedt
2012-12-11 0:48 ` Frank Rowand
2012-12-11 1:15 ` Frank Rowand
2012-12-11 1:53 ` Steven Rostedt
2012-12-11 7:07 ` Mike Galbraith
2012-12-11 12:43 ` Thomas Gleixner
2012-12-11 14:02 ` Steven Rostedt
2012-12-11 14:16 ` Steven Rostedt
2012-12-11 1:41 ` Steven Rostedt
2012-12-07 23:56 ` Steven Rostedt [this message]
2012-12-10 22:59 ` [RFC][PATCH RT 0/4] sched/rt: Lower rq lock contention latencies on many CPU boxes Clark Williams
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