From 1a4a678b12c84db9ae5dce424e0e97f0559bb57c Mon Sep 17 00:00:00 2001 From: Yinghai Lu Date: Fri, 17 Dec 2010 16:59:07 -0800 Subject: [PATCH] memblock: Make find_memory_core_early() find from top-down That is used for find ram in node or bootmem type. We should make it top-down so it will be consistent to memblock_find, and to avoid allocating potentially valuable low memory before we actually need it. Suggested-by: Jeremy Fitzhardinge Signed-off-by: Yinghai Lu LKML-Reference: <4D0C075B.3040501@kernel.org> Signed-off-by: H. Peter Anvin --- mm/page_alloc.c | 34 +++++++++++++++++++++++++++++++++- 1 file changed, 33 insertions(+), 1 deletion(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 07a654486f75..19413bfdef92 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -3555,6 +3555,34 @@ static int __meminit next_active_region_index_in_nid(int index, int nid) return -1; } +/* + * Basic iterator support. Return the last range of PFNs for a node + * Note: nid == MAX_NUMNODES returns last region regardless of node + */ +static int __meminit last_active_region_index_in_nid(int nid) +{ + int i; + + for (i = nr_nodemap_entries - 1; i >= 0; i--) + if (nid == MAX_NUMNODES || early_node_map[i].nid == nid) + return i; + + return -1; +} + +/* + * Basic iterator support. Return the previous active range of PFNs for a node + * Note: nid == MAX_NUMNODES returns next region regardless of node + */ +static int __meminit previous_active_region_index_in_nid(int index, int nid) +{ + for (index = index - 1; index >= 0; index--) + if (nid == MAX_NUMNODES || early_node_map[index].nid == nid) + return index; + + return -1; +} + #ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID /* * Required by SPARSEMEM. Given a PFN, return what node the PFN is on. @@ -3606,6 +3634,10 @@ bool __meminit early_pfn_in_nid(unsigned long pfn, int node) for (i = first_active_region_index_in_nid(nid); i != -1; \ i = next_active_region_index_in_nid(i, nid)) +#define for_each_active_range_index_in_nid_reverse(i, nid) \ + for (i = last_active_region_index_in_nid(nid); i != -1; \ + i = previous_active_region_index_in_nid(i, nid)) + /** * free_bootmem_with_active_regions - Call free_bootmem_node for each active range * @nid: The node to free memory on. If MAX_NUMNODES, all nodes are freed. @@ -3644,7 +3676,7 @@ u64 __init find_memory_core_early(int nid, u64 size, u64 align, int i; /* Need to go over early_node_map to find out good range for node */ - for_each_active_range_index_in_nid(i, nid) { + for_each_active_range_index_in_nid_reverse(i, nid) { u64 addr; u64 ei_start, ei_last; u64 final_start, final_end;