linux-kernel - [PATCH] sched: select eligible run-queue for RT task

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Message-ID: <BANLkTinmZ1tSpbwV7448usb1nshw=FJXXA@mail.gmail.com>
Date:	Fri, 3 Jun 2011 22:06:54 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Mike Galbraith <efault@....de>,
	Yong Zhang <yong.zhang0@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: [PATCH] sched: select eligible run-queue for RT task

When selecting run-queue for a given task, eligible run-queue should be
returned by checking the CPU affinity of task.

Signed-off-by: Hillf Danton <dhillf@...il.com>
---
 kernel/sched_rt.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 88725c9..45b3e0a 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -1006,7 +1006,8 @@ select_task_rq_rt(struct task_struct *p, int
sd_flag, int flags)
 	int cpu;

 	if (sd_flag != SD_BALANCE_WAKE)
-		return smp_processor_id();
+		return cpumask_test_cpu(smp_processor_id(), &p->cpus_allowed) ?
+			smp_processor_id() : task_cpu(p);

 	cpu = task_cpu(p);
 	rq = cpu_rq(cpu);
--
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