[PATCH] Don't let processes be scheduled on CPU-less nodes (1/3)

From: Matthew Dobson <colpatch@us.ibm.com>

sched_best_cpu schedules processes on nodes based on node_nr_running.  For
CPU-less nodes, this is always 0, and thus sched_best_cpu tends to migrate
tasks to these nodes, which eventually get remigrated elsewhere.

This patch adds include/linux/topology.h, and modifies all includes of
asm/topology.h to linux/topology.h.  A subsequent patch in this series adds
helper functions to linux/topology.h to ensure processes are only migrated
to nodes with CPUs.

Test compiled and booted by Andrew Theurer (habanero@us.ibm.com) on both
x440 and ppc64.

drivers/base/cpu.c

@@ -6,8 +6,7 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/cpu.h>
-
-#include <asm/topology.h>
+#include <linux/topology.h>
 
 
 struct class cpu_class = {

drivers/base/memblk.c

@@ -7,8 +7,7 @@
 #include <linux/init.h>
 #include <linux/memblk.h>
 #include <linux/node.h>
-
-#include <asm/topology.h>
+#include <linux/topology.h>
 
 
 static struct class memblk_class = {

drivers/base/node.c

@@ -7,8 +7,7 @@
 #include <linux/init.h>
 #include <linux/mm.h>
 #include <linux/node.h>
-
-#include <asm/topology.h>
+#include <linux/topology.h>
 
 
 static struct class node_class = {

include/asm-i386/cpu.h

@@ -3,8 +3,8 @@
 
 #include <linux/device.h>
 #include <linux/cpu.h>
+#include <linux/topology.h>
 
-#include <asm/topology.h>
 #include <asm/node.h>
 
 struct i386_cpu {

include/asm-i386/memblk.h

@@ -4,8 +4,8 @@
 #include <linux/device.h>
 #include <linux/mmzone.h>
 #include <linux/memblk.h>
+#include <linux/topology.h>
 
-#include <asm/topology.h>
 #include <asm/node.h>
 
 struct i386_memblk {

include/asm-i386/node.h

@@ -4,8 +4,7 @@
 #include <linux/device.h>
 #include <linux/mmzone.h>
 #include <linux/node.h>
-
-#include <asm/topology.h>
+#include <linux/topology.h>
 
 struct i386_node {
 	struct node node;

include/linux/mmzone.h

@@ -255,7 +255,7 @@ static inline struct zone *next_zone(struct zone *zone)
 #define MAX_NR_MEMBLKS	1
 #endif /* CONFIG_NUMA */
 
-#include <asm/topology.h>
+#include <linux/topology.h>
 /* Returns the number of the current Node. */
 #define numa_node_id()		(cpu_to_node(smp_processor_id()))
 

include/linux/topology.h

+/*
+ * include/linux/topology.h
+ *
+ * Written by: Matthew Dobson, IBM Corporation
+ *
+ * Copyright (C) 2002, IBM Corp.
+ *
+ * All rights reserved.          
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Send feedback to <colpatch@us.ibm.com>
+ */
+#ifndef _LINUX_TOPOLOGY_H
+#define _LINUX_TOPOLOGY_H
+
+#include <asm/topology.h>
+
+#endif /* _LINUX_TOPOLOGY_H */

mm/page_alloc.c

@@ -28,8 +28,7 @@
 #include <linux/blkdev.h>
 #include <linux/slab.h>
 #include <linux/notifier.h>
-
-#include <asm/topology.h>
+#include <linux/topology.h>
 
 DECLARE_BITMAP(node_online_map, MAX_NUMNODES);
 DECLARE_BITMAP(memblk_online_map, MAX_NR_MEMBLKS);

mm/vmscan.c

@@ -28,10 +28,10 @@
 #include <linux/pagevec.h>
 #include <linux/backing-dev.h>
 #include <linux/rmap-locking.h>
+#include <linux/topology.h>
 
 #include <asm/pgalloc.h>
 #include <asm/tlbflush.h>
-#include <asm/topology.h>
 #include <asm/div64.h>
 
 #include <linux/swapops.h>