linux-kernel - Re: [PATCH 0/5] ppc64 scheduler fixes

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Date:	Tue, 20 Sep 2011 10:19:38 +1000
From:	Anton Blanchard <anton@...ba.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	mingo@...e.hu, benh@...nel.crashing.org,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5] ppc64 scheduler fixes


Hi Peter,

> On Mon, 2011-07-25 at 12:33 +1000, Anton Blanchard wrote:
> > Here are a set of ppc64 scheduler fixes that help with some
> > multi node performance issues.
> 
> They look fine to me. I'll probably ping you when I'll rip out all
> that SD_NODES_PER_DOMAIN crap for good, but until then I'm fine with
> you fiddling it for ppc64.
> 
> Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>

Are you OK if Ben takes this, or would you prefer to send it via the
scheduler tree?

Anton
--

[2/5] sched: Allow SD_NODES_PER_DOMAIN to be overridden

We want to override the default value of SD_NODES_PER_DOMAIN on ppc64,
so move it into linux/topology.h.

Signed-off-by: Anton Blanchard <anton@...ba.org>

---

Index: linux-2.6-work/include/linux/topology.h
===================================================================
--- linux-2.6-work.orig/include/linux/topology.h	2011-07-25 11:20:02.588717796 +1000
+++ linux-2.6-work/include/linux/topology.h	2011-07-25 11:26:50.616468376 +1000
@@ -201,6 +201,10 @@ int arch_update_cpu_topology(void);
 	.balance_interval	= 64,					\
 }
 
+#ifndef SD_NODES_PER_DOMAIN
+#define SD_NODES_PER_DOMAIN 16
+#endif
+
 #ifdef CONFIG_SCHED_BOOK
 #ifndef SD_BOOK_INIT
 #error Please define an appropriate SD_BOOK_INIT in include/asm/topology.h!!!
Index: linux-2.6-work/kernel/sched.c
===================================================================
--- linux-2.6-work.orig/kernel/sched.c	2011-07-25 11:20:09.538850173 +1000
+++ linux-2.6-work/kernel/sched.c	2011-07-25 11:26:50.626468565 +1000
@@ -6938,8 +6938,6 @@ static int __init isolated_cpu_setup(cha
 
 __setup("isolcpus=", isolated_cpu_setup);
 
-#define SD_NODES_PER_DOMAIN 16
-
 #ifdef CONFIG_NUMA
 
 /**
--
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