Andy Wihitcroft wrote: [Sat Sep 09 2006, 09:03:09PM EDT]
> Bob Picco wrote:
> > Andrew,
> >
> > Mel's latest V9 regressed slightly for ia64 FLATMEM+VIRTUAL_MEM_MAP. When
> > the largest hole is greater than LARGE_GAP, vmem_map is allocated before
> > free_area_init_nodes; resultant crash follows. Rather than complicate
> > alloc_node_mem_map just for this ia64 case, add an adjustment to node_mem_map
> > which is later negated by alloc_node_mem_map.
> >
> > Previous to V9, the mem_map adjustment was done in the scope where allocation
> > is achieved in alloc_node_mem_map. The current code is more appropriate but
> > unfortunately caused an issue for ia64.
> >
> > Please add this to the next -mm.
> >
> > thanks,
> >
> > bob
> >
> > Acked-by: Mel Gorman <[email protected]>
> > Signed-off-by: Bob Picco <[email protected]>
> >
> > arch/ia64/mm/contig.c | 7 ++++++-
> > 1 file changed, 6 insertions(+), 1 deletion(-)
> >
> > Index: linux-2.6.18-rc4-mm3/arch/ia64/mm/contig.c
> > ===================================================================
> > --- linux-2.6.18-rc4-mm3.orig/arch/ia64/mm/contig.c 2006-08-28 13:10:00.000000000 -0400
> > +++ linux-2.6.18-rc4-mm3/arch/ia64/mm/contig.c 2006-08-28 18:18:54.000000000 -0400
> > @@ -252,7 +252,12 @@ paging_init (void)
> > vmem_map = (struct page *) vmalloc_end;
> > efi_memmap_walk(create_mem_map_page_table, NULL);
> >
> > - NODE_DATA(0)->node_mem_map = vmem_map;
> > + /*
> > + * alloc_node_mem_map makes an adjustment for mem_map
> > + * which isn't compatible with vmem_map.
> > + */
>
> Bob, which adjustment is this that is incompatible? Is it the one in
> the final stanza, the FLATMEM mem_map instantiation? This one?
Andy, yes this is the one.
>
> #ifdef CONFIG_ARCH_POPULATES_NODE_MAP
> if (page_to_pfn(mem_map) != pgdat->node_start_pfn)
> mem_map -= pgdat->node_start_pfn;
> #endif /* CONFIG_ARCH_POPULATES_NODE_MAP */
>
> -apw
bob
>
> > + NODE_DATA(0)->node_mem_map = vmem_map +
> > + find_min_pfn_with_active_regions();
> > free_area_init_nodes(max_zone_pfns);
> >
> > printk("Virtual mem_map starts at 0x%p\n", mem_map);
> > -
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>
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