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author | Yinghai Lu <yinghai@kernel.org> | 2010-12-17 16:59:07 -0800 |
---|---|---|
committer | H. Peter Anvin <hpa@linux.intel.com> | 2010-12-29 14:46:55 -0800 |
commit | 1a4a678b12c84db9ae5dce424e0e97f0559bb57c (patch) | |
tree | c272694389a0b035f198be679eb9355788fc0e5c | |
parent | 32e3f2b00c529477d26895c5428ed95bba537443 (diff) | |
download | linux-1a4a678b12c84db9ae5dce424e0e97f0559bb57c.tar.bz2 |
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>
-rw-r--r-- | mm/page_alloc.c | 34 |
1 files changed, 33 insertions, 1 deletions
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; |