linux-kernel - Re: [patch] CFS scheduler, -v17

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Date:	Fri, 15 Jun 2007 21:33:56 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Miguel Botón <mboton@...il.com>
Cc:	"Luiz Fernando N. Capitulino" <lcapitulino@...driva.com.br>,
	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>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Subject: Re: [patch] CFS scheduler, -v17


* Miguel Botón <mboton@...il.com> wrote:

> I patched kernel 2.6.21.5 with CFS v17 and I didn't experience this 
> problem (I checked that piece of code and I didn't see something 
> wrong). Looks like it only appears in kernel 2.6.22-rc4.

yeah - it affected the .22 patches, the .21 and .20 patches compiled and 
worked under !CONFIG_SMP too. I updated the .22 patches with the fix 
below.

	Ingo

-------------->
Index: linux-cfs-2.6.22-rc4.q/kernel/sched.c
===================================================================
--- linux-cfs-2.6.22-rc4.q.orig/kernel/sched.c
+++ linux-cfs-2.6.22-rc4.q/kernel/sched.c
@@ -248,6 +249,15 @@ static unsigned int static_prio_timeslic
 		return SCALE_PRIO(DEF_TIMESLICE, static_prio);
 }
 
+static inline int cpu_of(struct rq *rq)
+{
+#ifdef CONFIG_SMP
+	return rq->cpu;
+#else
+	return 0;
+#endif
+}
+
 #ifdef CONFIG_SMP
 /*
  * Divide a load by a sched group cpu_power : (load / sg->__cpu_power)
@@ -258,15 +268,6 @@ static inline u32 sg_div_cpu_power(const
 	return reciprocal_divide(load, sg->reciprocal_cpu_power);
 }
 
-static inline int cpu_of(struct rq *rq)
-{
-#ifdef CONFIG_SMP
-	return rq->cpu;
-#else
-	return 0;
-#endif
-}
-
 /*
  * Each time a sched group cpu_power is changed,
  * we must compute its reciprocal value
-
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