Christoph Hellwig [off-list ref] wrote:

Without this ouput on a box with 8cpus and NR_CPUS=64 looks rather
 strange.


 Index: mm/page_alloc.c
 ===================================================================
 RCS file: /home/cvs/linux/mm/page_alloc.c,v
 retrieving revision 1.113
 diff -u -p -r1.113 page_alloc.c
 --- mm/page_alloc.c	10 Jan 2004 04:59:57 -0000	1.113
 +++ mm/page_alloc.c	10 Feb 2004 13:17:43 -0000
 @@ -972,7 +972,13 @@ void show_free_areas(void)
  			printk("\n");
  
  		for (cpu = 0; cpu < NR_CPUS; ++cpu) {
 -			struct per_cpu_pageset *pageset = zone->pageset + cpu;
 +			struct per_cpu_pageset *pageset;
 +	
 +			if (!cpu_online(cpu))
 +				continue;

Thanks.  I think I'll change that to cpu_possible().  Because there might
still be pages there from the time when that cpu used to be online. 
Otherwise we wouldn't notice leaks due to cpu downing.
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