On Fri, 2007-04-27 at 15:17 +0900, KAMEZAWA Hiroyuki wrote:
> Add auto zone ordering configuration.
>
> This function will select ZONE_ORDER_NODE when
>
> - There are only ZONE_DMA or ZONE_DMA32.
> (or) size of (ZONE_DMA/DMA32) > (System Total Memory)/2
> (or) Assume Node(A)
> * Node (A)'s total memory > System Total Memory/num_of_node+1
> (and) Node (A)'s ZONE_DMA/DMA32 occupies 60% of Node(A)'s memory.
>
> otherwise, ZONE_ORDER_ZONE is selected.
>
> Note: a user can specifiy this ordering from boot option.
specify
>
> Signed-Off-By: KAMEZAWA Hiroyuki <[email protected]>
Minor editorial [spelling, ...] comments.
Acked-by: Lee Schermerhorn <[email protected]>
>
> ---
> mm/page_alloc.c | 44 +++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 43 insertions(+), 1 deletion(-)
>
> Index: linux-2.6.21-rc7-mm2/mm/page_alloc.c
> ===================================================================
> --- linux-2.6.21-rc7-mm2.orig/mm/page_alloc.c 2007-04-27 15:39:49.000000000 +0900
> +++ linux-2.6.21-rc7-mm2/mm/page_alloc.c 2007-04-27 15:55:51.000000000 +0900
> @@ -2211,8 +2211,50 @@
>
> static int estimate_zonelist_order(void)
> {
> - /* dummy, just select node order. */
> - return ZONELIST_ORDER_NODE;
> + int nid, zone_type;
> + unsigned long low_kmem_size,total_size;
> + struct zone *z;
> + int average_size;
> + /* ZONE_DMA and ZONE_DMA32 can be very small area in the sytem.
> + If they are really small and used heavily,
> + the system can fall into OOM very easily.
> + This function detect ZONE_DMA/DMA32 size and confgigure
detects configures
> + zone ordering */
> + /* Is there ZONE_NORMAL ? (ex. ppc has only DMA zone..) */
> + low_kmem_size = 0;
> + total_size = 0;
> + for_each_online_node(nid) {
> + for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) {
> + z = &NODE_DATA(nid)->node_zones[zone_type];
> + if (populated_zone(z)) {
> + if (zone_type < ZONE_NORMAL)
> + low_kmem_size += z->present_pages;
> + total_size += z->present_pages;
> + }
> + }
> + }
> + if (!low_kmem_size || /* there is no DMA area. */
> + !low_kmem_size > total_size/2) /* DMA/DMA32 is big. */
> + return ZONELIST_ORDER_NODE;
> + /* look into each node's config. where all processes starts... */
> + /* average size..a bit smaller than real average size */
> + average_size = total_size / (num_online_nodes() + 1);
> + for_each_online_node(nid) {
> + low_kmem_size = 0;
> + total_size = 0;
> + for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) {
> + z = &NODE_DATA(nid)->node_zones[zone_type];
> + if (populated_zone(z)) {
> + if (zone_type < ZONE_NORMAL)
> + low_kmem_size += z->present_pages;
> + total_size += z->present_pages;
> + }
> + }
> + if (total_size > average_size && /* ignore unbalanced node */
> + low_kmem_size > total_size * 60/100)
> + return ZONELIST_ORDER_NODE;
> + }
> + return ZONELIST_ORDER_ZONE;
> }
>
>
>
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