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[PATCH] Avoid excessive sorting of early_node_map[] 

find_min_pfn_for_node() and find_min_pfn_with_active_regions() sort
early_node_map[] on every call.  This is an excessive amount of sorting and
that can be avoided.  This patch always searches the whole early_node_map[]
in find_min_pfn_for_node() instead of returning the first value found.  The
map is then only sorted once when required.  Successfully boot tested on a
number of machines.

[akpm@osdl.org: cleanup]
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mel Gorman 2007-02-10 01:42:57 -08:00 committed by Linus Torvalds
parent e10a4437cb
commit a6af2bc3d5
1 changed files with 13 additions and 7 deletions
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20
mm/page_alloc.c
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@ -2877,20 +2877,23 @@ static void __init sort_node_map(void)
cmp_node_active_region, NULL);
}
/* Find the lowest pfn for a node. This depends on a sorted early_node_map */
/* Find the lowest pfn for a node */
unsigned long __init find_min_pfn_for_node(unsigned long nid)
{
int i;
/* Regions in the early_node_map can be in any order */
sort_node_map();
unsigned long min_pfn = ULONG_MAX;
/* Assuming a sorted map, the first range found has the starting pfn */
for_each_active_range_index_in_nid(i, nid)
return early_node_map[i].start_pfn;
min_pfn = min(min_pfn, early_node_map[i].start_pfn);
printk(KERN_WARNING "Could not find start_pfn for node %lu\n", nid);
return 0;
if (min_pfn == ULONG_MAX) {
printk(KERN_WARNING
"Could not find start_pfn for node %lu\n", nid);
return 0;
}
return min_pfn;
}
/**
@ -2939,6 +2942,9 @@ void __init free_area_init_nodes(unsigned long *max_zone_pfn)
unsigned long nid;
enum zone_type i;
/* Sort early_node_map as initialisation assumes it is sorted */
sort_node_map();
/* Record where the zone boundaries are */
memset(arch_zone_lowest_possible_pfn, 0,
sizeof(arch_zone_lowest_possible_pfn));