[patch 4/4] pcp: only local pagesets

[Nick Piggin <nickpiggin@yahoo.com.au>]

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4/4

-- 
SUSE Labs, Novell Inc.

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Index: linux-2.6/mm/page_alloc.c
===================================================================
--- linux-2.6.orig/mm/page_alloc.c	2005-04-09 22:45:07.000000000 +1000
+++ linux-2.6/mm/page_alloc.c	2005-04-09 23:13:53.000000000 +1000
@@ -1626,14 +1626,24 @@ void __init build_percpu_pagelists(void)
 			init_percpu_pageset(&zone->pageset, batch);
 			for (cpu = 0; cpu < NR_CPUS; cpu++) {
 				struct zone_pagesets *zp;
-				struct per_cpu_pageset *pageset;
+				struct per_cpu_pageset *pageset = NULL;
 			
 				zp = cpu_zone_pagesets(cpu);
-				pageset = alloc_bootmem_node(pgdat, sizeof(*pageset));
-				init_percpu_pageset(pageset, batch);
+				
+				/*
+				 * XXX: this test could be something like
+				 *   if (node_distance <= blah)
+				 * which would allow pagesets on close
+				 * remote nodes as well as the local node.
+				 */
+				if (cpu_to_node(cpu) == nid) {
+					pageset = alloc_bootmem_node(pgdat,
+							sizeof(*pageset));
+					init_percpu_pageset(pageset, batch);
+				}
 				zp->p[NODEZONE(nid, j)] = pageset;
-
 			}
+
 			printk(KERN_DEBUG "  %s zone: %lu pages, LIFO batch:%lu\n",
 					zone_names[j], zone->present_pages, batch);
 		}