linux-kernel - Re: [patch] CFS scheduler, -v18

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Date:	Sat, 23 Jun 2007 01:16:28 +0300
From:	"S.Çağlar Onur" <caglar@...dus.org.tr>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Subject: Re: [patch] CFS scheduler, -v18

23 Haz 2007 Cts tarihinde, S.Çağlar Onur şunları yazmıştı: 
> Hi Ingo;
>
> 23 Haz 2007 Cts tarihinde, Ingo Molnar şunları yazmıştı:
> > As usual, any sort of feedback, bugreport, fix and suggestion is more
> > than welcome!
>
> caglar@...getsu linux-2.6 $ LC_ALL=C make
>   CHK     include/linux/version.h
>   CHK     include/linux/utsrelease.h
>   CALL    scripts/checksyscalls.sh
>   CHK     include/linux/compile.h
>   CC      kernel/sched.o
> kernel/sched.c:745:28: sched_idletask.c: No such file or directory

Ahh and this happens with [1], grabbing sched_idletask.c from .18 one solves 
the problem...

Index: linux/kernel/sched_idletask.c
===================================================================
--- /dev/null
+++ linux/kernel/sched_idletask.c
@@ -0,0 +1,68 @@
+/*
+ * idle-task scheduling class.
+ *
+ * (NOTE: these are not related to SCHED_IDLE tasks which are
+ *  handled in sched_fair.c)
+ */
+
+/*
+ * Idle tasks are unconditionally rescheduled:
+ */
+static void check_preempt_curr_idle(struct rq *rq, struct task_struct *p)
+{
+	resched_task(rq->idle);
+}
+
+static struct task_struct *pick_next_task_idle(struct rq *rq, u64 now)
+{
+	schedstat_inc(rq, sched_goidle);
+
+	return rq->idle;
+}
+
+/*
+ * It is not legal to sleep in the idle task - print a warning
+ * message if some code attempts to do it:
+ */
+static void
+dequeue_task_idle(struct rq *rq, struct task_struct *p, int sleep, u64 now)
+{
+	spin_unlock_irq(&rq->lock);
+	printk(KERN_ERR "bad: scheduling from the idle thread!\n");
+	dump_stack();
+	spin_lock_irq(&rq->lock);
+}
+
+static void put_prev_task_idle(struct rq *rq, struct task_struct *prev, u64 
now)
+{
+}
+
+static struct task_struct *load_balance_start_idle(struct rq *rq)
+{
+	return NULL;
+}
+
+static void task_tick_idle(struct rq *rq, struct task_struct *curr)
+{
+}
+
+/*
+ * Simple, special scheduling class for the per-CPU idle tasks:
+ */
+struct sched_class idle_sched_class __read_mostly = {
+	/* no enqueue/yield_task for idle tasks */
+
+	/* dequeue is not valid, we print a debug message there: */
+	.dequeue_task		= dequeue_task_idle,
+
+	.check_preempt_curr	= check_preempt_curr_idle,
+
+	.pick_next_task		= pick_next_task_idle,
+	.put_prev_task		= put_prev_task_idle,
+
+	.load_balance_start	= load_balance_start_idle,
+	/* no .load_balance_next for idle tasks */
+
+	.task_tick		= task_tick_idle,
+	/* no .task_new for idle tasks */
+};


[1] 
http://people.redhat.com/mingo/cfs-scheduler/sched-cfs-v2.6.22-git-v18.patch

Cheers
-- 
S.Çağlar Onur <caglar@...dus.org.tr>
http://cekirdek.pardus.org.tr/~caglar/

Linux is like living in a teepee. No Windows, no Gates and an Apache in house!

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