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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 <jeremy@goop.org>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <4D0C075B.3040501@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Yinghai Lu 2010-12-17 16:59:07 -08:00 committed by H. Peter Anvin
parent 32e3f2b00c
commit 1a4a678b12
1 changed files with 33 additions and 1 deletions
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34
mm/page_alloc.c
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@ -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;