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[PATCH] sparsemem base: simple NUMA remap space allocator

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Introduce a simple allocator for the NUMA remap space.  This space is very
scarce, used for structures which are best allocated node local.

This mechanism is also used on non-NUMA ia64 systems with a vmem_map to keep
the pgdat->node_mem_map initialized in a consistent place for all
architectures.

Issues:
o alloc_remap takes a node_id where we might expect a pgdat which was intended
  to allow us to allocate the pgdat's using this mechanism; which we do not yet
  do.  Could have alloc_remap_node() and alloc_remap_nid() for this purpose.

Signed-off-by: Andy Whitcroft <[email protected]>
Signed-off-by: Dave Hansen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Dave Hansen 2005-06-23 00:07:39 -07:00 • committed by Linus Torvalds
commit 6f167ec721
4 changed files with 50 additions and 29 deletions
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6
mm/page_alloc.c
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@ -1936,6 +1936,7 @@ static void __init free_area_init_core(struct pglist_data *pgdat,
static void __init alloc_node_mem_map(struct pglist_data *pgdat)
{
unsigned long size;
struct page *map;
/* Skip empty nodes */
if (!pgdat->node_spanned_pages)
@ -1944,7 +1945,10 @@ static void __init alloc_node_mem_map(struct pglist_data *pgdat)
/* ia64 gets its own node_mem_map, before this, without bootmem */
if (!pgdat->node_mem_map) {
size = (pgdat->node_spanned_pages + 1) * sizeof(struct page);
pgdat->node_mem_map = alloc_bootmem_node(pgdat, size);
map = alloc_remap(pgdat->node_id, size);
if (!map)
map = alloc_bootmem_node(pgdat, size);
pgdat->node_mem_map = map;
}
#ifndef CONFIG_DISCONTIGMEM
/*